Jump to content

LIGO AIR User Guide: Difference between revisions

From SOJI ELECTRONICS
[unchecked revision][unchecked revision]
← Older editNewer edit →
Admin (talk | contribs)
Bureaucrats, Interface administrators, Administrators
1,201 edits
VisualWikitext
m Admin moved page LIGO Air Manual to LIGO Air User Guide
No edit summary
Line 1: Line 1:
This user manual provides detailed instructions for the proper installation of the LIGO AIR fuel level sensor. The guide is intended for technicians, engineers, system integrators and end-users who are responsible for installing and maintaining the sensor in a variety of fuel tanks and vehicles.
''LIGO AIR User Guide v1.2 — Wireless Fuel Level Sensor''
''Document version: 1.2 | Date: 04/11/2025 | Language: English''


The LIGO AIR fuel level sensor is a precision device designed by SOJI Electronics to measure the level of fuel in tanks with high accuracy and reliability. Correct installation is critical to ensure optimal performance and long-term durability.
== Safety Information ==


'''Please read this manual thoroughly before beginning the installation process.''' Following the steps and recommendations provided will help you avoid common issues and ensure safe, effective operation of the sensor.
'''Read this section completely before installation or operation.''' Failure to observe these warnings may result in serious injury, death, or damage to equipment.


[[File:LIGO-AIR-product-overview.png|thumb|400px|right|LIGO AIR series overview]]
=== General Safety ===


== General Introduction ==
The LIGO AIR fuel level sensor must be installed and operated only by '''qualified technicians''' familiar with fuel tank systems, electrical safety, and wireless device installation. Personal Protective Equipment (PPE) is required during installation.


LIGO-AIR Fuel Level Sensor is developed and manufactured by SOJI Electronics JSC. The device is designed to measure the level of liquid fuel and other non-conductive liquids in vehicle tanks and stationary fuel storage, applicable in different fields. Equipped with advanced Bluetooth Low Energy technology, LIGO AIR enables seamless, real-time data transmission without the need for complex wiring and easy for installation.
{| class="wikitable" style="border-left: 4px solid #d32f2f; background:#ffebee;"
| ⚠️ '''DANGER — Fire / Explosion Hazard'''
|-
|
* '''Hazard''': Fuel vapors are highly flammable and can ignite from sparks, open flames, or static electricity
* '''Consequence''': Serious injury, death, or destruction of vehicle/equipment
* '''Required action''': Before drilling or installation, '''completely empty the fuel tank''' and ventilate all residual vapors. Use only non-sparking tools. Maintain fire extinguisher within 5 meters. No smoking or open flames within 10 meters of work area.
|}


The wireless fuel level sensor helps minimize the risk of signal wire tampering. In addition, the heavy-duty metal structure helps increase protection against environmental factors such as dust, moisture, vibration and high temperature conditions.
{| class="wikitable" style="border-left: 4px solid #f57c00; background:#fff3e0;"
| ⚠️ '''WARNING — Mechanical / Pressure Hazard'''
|-
|
* '''Hazard''': Pressurized fuel system may eject fluid under pressure
* '''Consequence''': Eye injury, skin chemical burns
* '''Required action''': Wear safety goggles and chemical-resistant gloves. Relieve fuel system pressure before opening tank. Allow tank to depressurize for at least 10 minutes.
|}


== Key Features ==
{| class="wikitable" style="border-left: 4px solid #f57c00; background:#fff3e0;"
| ⚠️ '''WARNING — Battery Hazard'''
|-
|
* '''Hazard''': Lithium-Thionyl Chloride (Li-SOCl₂) battery contains hazardous chemicals
* '''Consequence''': Chemical burns if punctured. Fire risk if short-circuited or exposed to >100°C
* '''Required action''': Do not puncture, crush, disassemble, or incinerate the battery. Replace only with authorized SOJI battery part. Dispose at certified battery recycling facility.
|}


* High accuracy up to 99.5%
{| class="wikitable" style="border-left: 4px solid #f9a825; background:#fffde7;"
* Directional antenna technology — communication range up to '''1.5 times''' greater than typical market-available sensors
| ⚠️ '''CAUTION — RF Exposure'''
* Ultra-low power consumption: '''9 µA in working mode''' and '''4 µA in storage mode'''
|-
* Optionally cut off or prolonged up to 6000 mm
|
* Wide operating temperature: '''-40 °C to +85 °C'''
* '''Hazard''': Bluetooth Low Energy radio emissions
* TX power up to '''19.5 dBm''' (LIGO AIR PRO)
* '''Consequence''': Possible RF exposure exceeding limits at very close range
* Battery capacity up to '''3600 mAh''' (optional)
* '''Required action''': Maintain minimum '''20 cm''' distance between sensor and human body during prolonged operation. Comply with local RF exposure regulations.
* Replaceable battery
|}
* Built-in accelerometer (LIGO AIR PRO)
* Built-in 32 Mb EEPROM for data logs (minimum 90 days) and setting logs (max 500 logs)
* Built-in anti-mud oil filter and anti-vibration springs
* '''IP69K''' waterproof standard
* '''8–10 years''' of battery life


== General Applications ==
{| class="wikitable" style="border-left: 4px solid #1976d2; background:#e3f2fd;"
| ℹ️ '''NOTICE — Sensor Damage Prevention'''
|-
|
* Do not expose sensor to temperatures outside -40°C to +85°C operating range
* Do not exceed IP69K conditions (no submersion beyond 1 m for 30 minutes)
* Do not use sensor with conductive fluids (water, acids, alkalines)
* Do not modify or attempt to repair the sensor housing
|}


* Trucks, excavators, heavy construction machines
=== Emergency Procedures ===
* Marine vessels and electric generators
* Off-highway machinery in high-temperature and vibration environments
* Industrial oil storage tanks or stationary storage tanks


== Product Variants ==
In case of fire involving fuel vapor or sensor battery:


The LIGO AIR series offers three specialized versions, each optimized to meet specific operational demands:
# Evacuate area immediately
# Use only '''Class B (flammable liquid)''' or '''Class D (metal/lithium)''' fire extinguishers — never water
# Contact emergency services
# Do not approach until area is declared safe
 
== Product Overview ==
 
The LIGO AIR is a '''wireless fuel level sensor''' designed and manufactured by SOJI Electronics for measuring the level of liquid fuel and other non-conductive liquids in vehicle tanks and stationary fuel storage applications.
 
Equipped with '''Bluetooth Low Energy 5.4''' technology, LIGO AIR enables seamless, real-time data transmission without requiring complex wiring. The heavy-duty metal structure provides protection against dust, moisture, vibration, and high-temperature environments.
 
[[File:LIGO-AIR-product-overview.png|thumb|right|400px|LIGO AIR Wireless Fuel Level Sensor]]
 
=== Intended Use ===
 
LIGO AIR is intended for:
 
* Fuel level measurement in '''diesel, gasoline, and non-conductive liquid tanks'''
* Mobile applications: trucks, excavators, cement mixers, construction machinery
* Stationary applications: marine vessels, generators, industrial oil storage tanks
* Off-highway machinery in harsh environments
 
=== NOT Intended For ===
 
LIGO AIR is '''not intended''' for:
 
* Measurement of conductive fluids (water, electrolytes, acids, alkalines)
* Use in '''hazardous (ATEX/IECEx)''' zones unless specifically certified
* Aviation, medical, or life-safety critical applications
* Operation outside specified temperature range (-40 °C to +85 °C)
 
=== Product Variants ===


{| class="wikitable"
{| class="wikitable"
! Variant !! Description !! Use Cases
! Variant !! Description !! Battery Life !! Range
|-
|-
| '''LIGO AIR LxS''' || Standard cost-effective version that fulfills essential monitoring needs while maintaining reliable performance || Trucks, excavators, cement mixer trucks, heavy construction machines
| LIGO AIR LxS || Standard cost-effective version || 6–8 years || Standard
|-
|-
| '''LIGO AIR LxT''' || Extended-battery version designed for applications that demand long operational life (8–12 years) and reliable performance in harsh environments || High-temperature applications, long maintenance intervals
| LIGO AIR LxT || Extended-battery version || '''8–12 years''' || Standard
|-
|-
| '''LIGO AIR PRO''' || Long-range version designed for applications requiring extended transmission distances or operation in environments with significant obstacles || Marine vessels, electric generators, industrial oil storage tanks, stationary storage tanks
| LIGO AIR PRO || Long-range version (high TX power) || 6–8 years || '''2× Standard'''
|}
|}


=== Performance Comparison ===
== Package Contents ==
 
Each LIGO AIR shipment includes:


{| class="wikitable"
{| class="wikitable"
! Parameter !! Competitive products !! LIGO AIR LxS (Standard) !! LIGO AIR LxT (Extended battery) !! LIGO AIR PRO LxS (Extended range)
! No. !! Item !! Quantity
|-
| 1 || LIGO AIR Fuel Level Sensor (700/1000/1500 mm standard, custom on request) || 01
|-
| 2 || Oil filter || 01
|-
| 3 || Gasoline-resistant rubber gasket || 01
|-
| 4 || Bottom-stop and springs || 01
|-
| 5 || Self-drilling screw M4.8 × 32 mm || 05
|-
|-
| Battery life      || 0.4× Standard (2–4 years) || Standard (6–8 years) || '''1.5×''' Standard (8–12 years) || Standard (6–8 years)
| 6 || Rivet and screw M5 × 20 mm || 05
|-
|-
| Transmission range || 0.6× Standard            || Standard            || Standard                      || '''2×''' Standard
| 7 || Protective cap || 01
|-
| 8 || Quick installation manual || 01
|}
|}


== Technical Specifications ==
'''Verify all items are present before installation.''' Contact SOJI Electronics if any item is missing or damaged.


{| class="wikitable"
== Specifications ==
! Parameter !! LIGO AIR (LxS, LxT) !! LIGO AIR PRO
 
{| class="wikitable" style="text-align:center;"
! Parameter !! LIGO AIR (LxS, LxT) !! LIGO AIR-PRO
|-
|-
| Standard length (L), mm || colspan="2" align="center" | 700, 1000, 1500 ... up to 6000 mm
| Standard length (L), mm       || colspan="2" | 700, 1000, 1500 ... up to 6000 mm
|-
|-
| Measuring error, %     || colspan="2" align="center" | ± 0.5 %
| Measuring error, %             || colspan="2" | ± 0.5 %
|-
|-
| Bluetooth specs         || colspan="2" align="center" | Bluetooth 5.4, IEEE 802.15.4-2006, 2.4 GHz, -95 dBm sensitivity
| rowspan="2" | Bluetooth specs || colspan="2" | ''Bluetooth'' 5.4, IEEE 802.15.4-2006, 2.4 GHz, -95 dBm sensitivity
|-
|-
| TX power max           || 6 dBm                       || '''19.5 dBm'''
| TX power max: 6 dBm           || TX power max: '''19.5 dBm'''
|-
|-
| Advertising Protocol   || colspan="2" | SOJI Protocol (default), Mielta Protocol, Escort Protocol — selectable in mobile app
| Advertising Protocol           || colspan="2" | SOJI (default), Mielta, Escort — selectable in mobile app
|-
|-
| Power supply (built-in Li-SOCl₂ battery) || 3.6 V × 2600 mAh (LxS) <br/> 3.6 V × 2400 mAh (LxT) || 3.6 V × 3600 mAh
| Power supply                   || 3.6V × 2600mAh (LxS) / 2400mAh (LxT) Li-SOCl₂ || 3.6V × 3600mAh
|-
|-
| Current consumption (working mode), µA   || 9   || 27
| Current (working mode), µA     || 9 || 27
|-
|-
| Measurement interval (second)           || colspan="2" align="center" | From 5 to 10
| Measurement interval (s)       || colspan="2" | 5 to 10
|-
|-
| Advertising message interval (second)   || From 5 to 10 || From 10 to 15
| Advertising interval (s)       || 5 to 10 || 10 to 15
|-
|-
| Waterproof standard (IP)                || colspan="2" align="center" | IP69K
| Ingress protection            || colspan="2" | IP69K
|-
|-
| Operating temperature (°C)               || colspan="2" align="center" | -40 ... +85
| Operating temperature (°C)     || colspan="2" | -40 to +85
|-
|-
| Resolution (bit)                         || colspan="2" align="center" | 12
| Resolution (bit)               || colspan="2" | 12
|-
|-
| Accelerometer                           || N/A || Built-in
| Accelerometer                 || N/A || Built-in
|-
|-
| Memory                                   || colspan="2" align="center" | Built-in 32 Mb EEPROM
| Memory                         || colspan="2" | Built-in 32 Mb EEPROM
|-
|-
| Average sampling period (s)             || colspan="2" align="center" | 5 to 60
| Service life (expected), years || colspan="2" | 10
|-
|-
| Absolute error in temperature measurement (°C) || colspan="2" align="center" | ±2
| Storage condition              || colspan="2" | 15 °C to 30 °C, RH < 60 %
|}
 
=== Sensor Dimensions ===
 
[[File:LIGO-AIR-dimensions.png|thumb|center|500px|LIGO AIR overall dimensions (mm)]]
 
{| class="wikitable"
! Part Number !! Length L (mm)
|-
|-
| Average service life (expected)         || colspan="2" align="center" | 10 years
| LIGO AIR – L7S, L7T, LIGO AIR PRO – L7S         || 700 ± 3
|-
|-
| Storage condition                        || colspan="2" align="center" | 15 °C to 30 °C, RH < 60%
| LIGO AIR – L10S, L10T, LIGO AIR PRO – L10S      || 1000 ± 3
|-
| LIGO AIR – L15S, L15T, LIGO AIR PRO – L15S      || 1500 ± 3
|}
|}


== Sensor Structure and Dimensions ==
== Installation ==
 
'''Before installation''': Read [[#Safety Information|Safety Information]] section thoroughly.
 
=== Tools Required ===
 
* Electric drill with Ø4 mm and Ø42 mm bits
* M4.8 self-tapping screw driver (or M5 rivet tool depending on tank thickness)
* Cutting tool for sensor tube (hacksaw or pipe cutter)
* Deburring tool
* Fuel-resistant RTV silicone gasket sealant
* Mobile phone with LIGO BLE Configurator app installed
* Personal Protective Equipment (PPE): safety goggles, chemical-resistant gloves
 
=== Step 1: Fuel Tank Preparation ===
 
# Empty the fuel tank completely. For gasoline tanks, '''ventilate all fuel vapors''' to prevent fire/explosion (see [[#Safety Information|Safety]])
# Clean and dry the tank interior
# Select installation location:
#* As close as possible to the tank's '''geometric center'''
#* At the tank's '''deepest point'''
#* Avoid contact with reinforcement ribs or internal equipment


[[File:LIGO-AIR-dimensions.png|thumb|500px|center|LIGO AIR series overall dimensions (mm)]]
[[File:LIGO-AIR-tank-location.png|thumb|center|500px|Installation location — front, left, and top view]]
 
=== Step 2: Drilling Mounting Holes ===
 
Drill a central hole (Ø42 mm) and four mounting holes (Ø7 mm) as shown:
 
[[File:LIGO-AIR-drilling-pattern.png|thumb|center|500px|Drilling pattern: Ø40 center hole + 4 × Ø4 mounting holes at 70.5 × 70.5 mm spacing]]


{| class="wikitable"
{| class="wikitable"
! Manufacturer Part Number !! L (mm)
! Tank wall thickness !! Fastener type !! Mounting hole
|-
| ≤ 3 mm || M5 rivet nut          || 4 × Ø7 mm
|-
|-
| LIGO AIR – L7S, L7T, LIGO AIR PRO – L7S      || 700 ± 3
| > 3 mm || M4.8 self-tapping screw || 4 × Ø7 mm
|}
 
{| class="wikitable" style="border-left: 4px solid #1976d2; background:#e3f2fd;"
| ℹ️ '''NOTICE — Sensor Orientation'''
|-
|-
| LIGO AIR – L10S, L10T, LIGO AIR PRO – L10S    || 1000 ± 3
| Mounting hole positions must ensure the sensor's '''directional arrow points toward the BLE receiver'''. Incorrect orientation will severely reduce wireless range.
|}
 
=== Step 3: Sensor Tube Preparation ===
 
Cut the sensor tube to length:
 
  L = H − 25 mm
 
Where:
* '''L''' = final tube length after cutting
* '''H''' = height of the tank at the installation point
 
After cutting:
# Remove all burrs with deburring tool
# Clean the tube interior with fuel
 
{| class="wikitable" style="border-left: 4px solid #f57c00; background:#fff3e0;"
| ⚠️ '''WARNING'''
|-
|-
| LIGO AIR – L15S, L15T, LIGO AIR PRO – L15S    || 1500 ± 3
| Minimum tube length after cutting is '''150 mm (15 cm)'''. Shorter tubes will not function correctly.
|}
|}


== Important Installation Notes ==
=== Step 4: Install Bottom-Stop and Filter ===
 
Install the bottom-stop and oil filter in sequence as shown:
 
[[File:LIGO-AIR-bottom-stop-filter.png|thumb|center|400px|Bottom-stop spring and oil filter installation]]
 
=== Step 5: Mount Sensor on Fuel Tank ===
 
# Apply '''fuel-resistant RTV silicone gasket sealant''' to:
#* Tank surface around the central hole
#* Gasket (both sides)
#* Sensor flange
# Insert the LIGO AIR sensor through the central hole
# Align so the directional arrow points toward the BLE receiver
# Fasten using appropriate screws (self-tapping or rivet)
 
[[File:LIGO-AIR-orientation-examples.png|thumb|center|600px|Correct (✓) vs incorrect (✗) sensor orientations]]
 
=== Step 6: Verify Installation Clearance ===
 
Ensure a minimum clearance of '''150 mm''' between the top of the sensor and any overhead metal surface to avoid BLE signal attenuation.
 
[[File:LIGO-AIR-clearance.png|thumb|center|400px|Minimum 150 mm clearance from overhead metal]]
 
After mounting, proceed to [[#Configuration|Configuration]].
 
== Configuration ==
 
LIGO AIR is configured via the '''LIGO BLE Configurator''' mobile application.
 
=== Mobile App Installation ===
 
Download LIGO BLE Configurator from:
 
* '''iOS''': App Store
* '''Android''': Google Play
 
After installation, '''grant all permissions''' requested by the app:
 
* Camera (for QR code scanning)
* Location (required by Android for BLE scanning)
* Nearby devices / Bluetooth
 
[[File:LIGO-AIR-app-permissions.png|thumb|center|400px|Granting app permissions]]
 
=== Connecting to the Sensor ===
 
# Open the LIGO BLE Configurator app
# Tap '''LIGO AIR''' in the product list
# Scan the area — the app will list discovered sensors
# Tap '''Connect''' next to the desired sensor
 
Each sensor shows:
* Name (e.g., LIGO AIR_7EEF7E7F)
* RSSI (signal strength, should be ≥ -80 dBm)
* Temperature
* Current fuel level
* Battery voltage (Vbat)
* Firmware version (FW)
 
[[File:LIGO-AIR-device-list.png|thumb|center|400px|Selecting LIGO AIR from device list]]
 
=== Calibration: Set Empty / Set Full ===


* Install the sensor in the direction of maximum signal transmission — the directional arrow on the sensor cover should point toward the receiving device.
After installation, calibrate the sensor:
* Minimum allowable length of the measuring probe is '''150 mm'''.
* Make sure there is no metal plate covering the sensor head, as this may block Bluetooth signal.
* Ensure that the signal strength (RSSI) at the receiving device is not less than '''-80 dBm'''. For weak signal cases, use a LIGO AIR PRO or a LIGO AIR Adapter.
* '''Change the default password''' provided by the manufacturer to prevent unauthorized access.
* Detailed mobile application instructions are described in [[LIGO Air Configuration]].


[[File:LIGO-AIR-orientation.png|thumb|600px|center|Sensor mounting orientation — directional arrow must point toward the receiver]]
==== Step 1: Set Full ====


== Products and Accessories ==
# Immerse the sensor in fuel until fuel reaches the sensor flange
# Wait for '''C_working''' value to stabilize (~30 seconds)
# Press '''Set Full''' button in the app
 
[[File:LIGO-AIR-set-full.png|thumb|center|400px|Set Full procedure]]
 
==== Step 2: Set Empty ====
 
# Remove the sensor from fuel
# Wait '''1–2 minutes''' for fuel to drain from the measuring probe
# Press '''Set Empty''' button in the app
 
[[File:LIGO-AIR-set-empty.png|thumb|center|400px|Set Empty procedure]]
 
=== Configurable Parameters ===


{| class="wikitable"
{| class="wikitable"
! No. !! Description !! Qty (pcs)
! Parameter !! Default !! Range / Options
|-
|-
| 1 || LIGO AIR Fuel Level Sensor — Standard lengths: 700, 1000, and 1500 mm (custom lengths on request) || 01
| Device name            || LIGO AIR_<MAC> || Customizable
|-
|-
| 2 || Oil filter || 01
| Advertising protocol    || SOJI          || SOJI / Mielta / Escort
|-
| Measurement interval    || 5–10 s        || 5 to 60 s
|-
|-
| 3 || Gasoline-resistant rubber gasket || 01
| Advertising interval    || 5–10 s        || 5–10 s (LIGO AIR), 10–15 s (PRO)
|-
|-
| 4 || Bottom-stop and springs || 01
| Output mode            || 0–4095 raw    || 0–1023 raw / 0–4095 raw / Liters
|-
|-
| 5 || Self-drilling screw M4.8 × 32 mm || 05
| Password                || (default)      || '''CHANGE before deployment'''
|}
 
{| class="wikitable" style="border-left: 4px solid #1976d2; background:#e3f2fd;"
| ℹ️ '''Security Recommendation'''
|-
|-
| 6 || Rivet and screw M5 × 20 mm || 05
| Change the default password immediately after first connection to prevent unauthorized configuration changes.
|}
 
== Operation ==
 
After installation and calibration, LIGO AIR operates autonomously, transmitting fuel level data via BLE advertising packets at configured intervals.
 
=== Calibration Table ===
 
LIGO AIR supports two calibration methods:
 
{| class="wikitable"
! Method !! Description !! Recommended
|-
|-
| 7 || Protective cap || 01
| '''On Platform (Server)''' || Sensor sends raw values (0–4095). Server converts to volume (liters) using calibration table. || ✓ '''Recommended'''
|-
|-
| 8 || User manual || 01
| '''On Sensor''' || Sensor sends volume values directly using internal calibration table. ||
|}
|}


== Preparation ==
The manufacturer recommends '''platform calibration''' for fleet management scenarios because:
 
* Single source of truth on the server
=== Fuel Tank Preparation ===
* Easier to update calibration across multiple sensors
* Reduces sensor memory load


# Empty the tank, clean and dry it if necessary. For gasoline fuel tanks, '''all fuel vapors must be removed from the tank''' to prevent fire or explosion during installation.
=== Reading Sensor Data ===
# Select the installation location with the following requirements:
#* The sensor's installation location must be as close as possible to the tank's geometric center and at its deepest point
#* Ensure that the sensor avoids contact with reinforcement ribs and other equipment inside the tank


[[File:LIGO-AIR-tank-location.png|thumb|500px|center|Sensor installation location — Front, Left, Top view]]
LIGO AIR data is received by:


=== Drilling Holes ===
* '''Telematics device''' (FM tracker) with BLE scanning
* '''Smartphone''' with LIGO BLE Configurator app


Drill a central hole (Ø42 mm), then drill four additional Ø7 mm holes for mounting screws as shown:
For protocol integration details, see [[LIGO Air Configuration#Protocol Integration|Protocol Integration]].


[[File:LIGO-AIR-drilling-pattern.png|thumb|500px|center|Drilling pattern: Ø40 center + 4 × Ø4 mounting holes at 70.5 × 70.5 mm spacing]]
=== Long-Range Operation ===


'''Notes''': The mounting hole diameter depends on the material and thickness of the tank:
For challenging environments (long distance, metal obstacles):


{| class="wikitable"
{| class="wikitable"
! Tank wall thickness !! Fastener type !! Mounting hole diameter
! Combination !! Range
|-
| LIGO AIR + Telematics device      || Standard
|-
|-
| ≤ 3 mm || M5 rivet nut        || 4 × Ø7 mm
| LIGO AIR + LIGO AIR Adapter      || '''2× Standard'''
|-
|-
| > 3 mm || M4.8 self-tapping screw || 4 × Ø7 mm
| LIGO AIR PRO + LIGO AIR Adapter  || '''4× Standard'''
|}
|}


'''Important''': Mounting hole positions must ensure that the sensor is installed in the direction of maximum signal transmission (the directional arrow on the sensor cover should point toward the receiving device).
=== Installing the Protective Cap ===


=== Sensor Preparation ===
After installation and calibration are complete, install the protective cap to prevent unauthorized access and protect against environmental damage.


==== Cutting the Sensor Tube ====
[[File:LIGO-AIR-cap-install.png|thumb|center|400px|Push the cap until it clicks into place]]


The length of the sensor tube should be calculated by the formula:
For inspection, remove the cap as shown:


  L = H − 25 mm
[[File:LIGO-AIR-cap-removal.png|thumb|center|500px|Correct (✓) vs incorrect (✗) cap removal procedure]]


Where:
== Troubleshooting ==
* '''L''' — final tube length after cutting
* '''H''' — height of the tank at the installation point


After cutting, remove any burrs and clean the tube using fuel.
{| class="wikitable"
! Symptom !! Possible Cause !! Solution
|-
| Sensor not found in app's device list
|
* Bluetooth disabled on phone
* Sensor in storage mode (not yet activated)
* Sensor out of range (>50 m)
* Metal obstruction blocking signal
|
* Enable Bluetooth, restart app
* Move within 1 m of sensor and retry
* Use LIGO AIR Adapter to boost reception
* Verify orientation (directional arrow toward receiver)
|-
| Connection drops frequently
|
* RSSI weaker than -80 dBm
* High RF interference (other 2.4 GHz devices)
* Tank metal interference
|
* Reposition receiver closer
* Use LIGO AIR PRO + Adapter
* Reorient sensor (arrow toward receiver)
|-
| Fuel reading inaccurate
|
* Calibration error
* Sensor tube damaged or bent
* Filter clogged with debris
* Wrong calibration table on platform
|
* Recalibrate using Set Empty / Set Full
* Inspect probe, replace if bent
* Clean or replace oil filter
* Verify calibration table values
|-
| Reading shows fixed value (no change)
|
* Sensor electronics frozen
* Storage mode not deactivated
|
* Disconnect and reconnect via app
* Power-cycle by removing/inserting battery
|-
| Battery voltage drops rapidly
|
* Battery near end of life (8+ years)
* Measurement interval too short
* Operating in temperature extremes
|
* Replace battery (see [[#Maintenance|Maintenance]])
* Increase measurement interval
* Verify operating temperature within range
|-
| Sensor reports incorrect temperature
|
* Sensor near heat source (engine, exhaust)
* Sensor still warming up after installation
|
* Relocate sensor away from heat sources
* Wait 10 minutes for thermal equilibrium
|-
| App permission denied
|
* Camera/Location/Bluetooth permissions not granted
|
* Phone Settings → Apps → LIGO BLE Configurator → Permissions → Grant all
|-
| Forgot password
|
* Custom password set, then lost
|
* Contact SOJI Support (proof of ownership required for reset)
|}


'''Note''': The minimum length of the tube after cutting must be at least '''150 mm (15 cm)'''.
If problem persists after troubleshooting, contact [[#Support / Contact|Support]].


==== Installing Bottom-Stop Springs and Filter ====
== Maintenance ==


Install the bottom-stop and the oil filter in sequence, as shown:
=== Periodic Inspection ===


[[File:LIGO-AIR-bottom-stop-filter.png|thumb|400px|center|Installing bottom-stop springs and oil filter]]
{| class="wikitable"
! Frequency !! Action
|-
| '''Monthly'''  || Verify sensor reports data via mobile app or telematics platform
|-
| '''Quarterly''' || Check protective cap integrity. Verify mounting screws still secure.
|-
| '''Annually'''  || Remove sensor, clean filter, inspect probe for damage. Verify gasket seal still functional.
|-
| '''Every 5 years''' || Check battery voltage trend. If below 3.4V consistently, plan battery replacement.
|-
| '''Every 8–10 years''' || Replace battery (Li-SOCl₂ 3.6V).
|}


== Installing Sensor on the Fuel Tank ==
=== Cleaning ===


# Apply gasket sealant to the fuel tank, gasket and sensor flange (using fuel-resistant RTV silicone gasket maker).
# Disconnect sensor from fuel tank (drain tank if necessary)
# Insert the LIGO AIR fuel sensor into the tank and fasten it securely using the appropriate screws (self-tapping screws or rivet nuts depending on tank thickness).
# Wipe external surface with dry cloth or cloth lightly dampened with non-conductive cleaner
# Do '''NOT''' use:
#* Solvents (acetone, benzene)
#* Abrasive materials
#* High-pressure water beyond IP69K rating
# Inspect and clean the oil filter — replace if clogged
# Reinstall with new gasket sealant


'''Note''': Install the sensor in the direction of maximum signal transmission. The directional arrow on the sensor cover should point toward the receiving device.
=== Battery Replacement ===


[[File:LIGO-AIR-orientation-examples.png|thumb|600px|center|Correct vs incorrect sensor orientations]]
{| class="wikitable" style="border-left: 4px solid #f57c00; background:#fff3e0;"
| ⚠️ '''WARNING — Battery Replacement Safety'''
|-
|
* Replace only with authorized '''SOJI Li-SOCl₂ 3.6V''' battery (part numbers vary by variant)
* Disconnect sensor from fuel tank before opening
* Ensure work area is ventilated and free of ignition sources
* Wear chemical-resistant gloves
|}


'''Clearance Requirement''': Ensure a minimum clearance of '''150 mm''' between the top of the sensor and any overhead metal surface.
# Remove protective cap
# Loosen 4 mounting screws (do not remove from tank)
# Lift sensor housing off the tank
# Open battery compartment per technical instruction
# Remove old battery — '''observe polarity'''
# Install new battery — match polarity markers
# Close battery compartment
# Reassemble sensor and verify operation with mobile app


[[File:LIGO-AIR-clearance.png|thumb|400px|center|Minimum 150 mm clearance from overhead metal plate]]
=== Calibration Verification ===


After installation, proceed with calibration as described in [[LIGO Air Configuration]].
After any maintenance involving probe replacement or modification, '''re-perform Set Empty / Set Full calibration''' (see [[#Configuration|Configuration]]).


== Installing Protective Cap ==
=== Disposal / End-of-Life ===


The protective cap should be installed '''after''' the sensor installation and calibration processes are completed. This cap helps prevent unauthorized access and protects the sensor from environmental factors such as sunlight and physical impact.
LIGO AIR contains a lithium battery and electronic components subject to WEEE (Waste Electrical and Electronic Equipment) regulations.


[[File:LIGO-AIR-cap-install.png|thumb|400px|center|Push the protective cap until it clicks into place]]
# Remove battery and dispose separately at certified battery recycling facility
# Send sensor body to electronic waste recycling
# Do NOT dispose in regular trash or landfill
# In EU: Take-back via local WEEE registration scheme


In cases when sensor inspection is required, the protective cap must be removed. Follow the removal procedure as shown:
== Certification / Compliance ==


[[File:LIGO-AIR-cap-removal.png|thumb|500px|center|Correct vs incorrect cap removal]]
LIGO AIR is manufactured to meet international standards and regulations.


'''Note''': Please ensure that no parts of the sensor are damaged while removing the protective cap.
=== Wireless / Radio ===


== Sensor Seal Cover Removal ==
{| class="wikitable"
! Region !! Standard / Approval
|-
| EU      || RED 2014/53/EU, EMC 2014/30/EU
|-
| US      || FCC Part 15.247
|-
| Canada  || ISED RSS-247, RSS-Gen, ICES-003
|-
| UK      || UKCA, UK RED
|-
| Japan    || MIC (Telec)
|}


In cases when sensor inspection is required, the protective cap must be removed using the correct procedure (see image above). Incorrect removal may damage the sensor housing.
=== Environmental ===


== Solutions for Long-Range or Metal-Obstructed Environments ==
{| class="wikitable"
! Standard !! Status
|-
| RoHS 3 (2011/65/EU + 2015/863) || Compliant
|-
| REACH (EU Regulation 1907/2006) || Compliant
|-
| WEEE (2012/19/EU)              || Registered
|-
| Battery WEEE (2006/66/EC)        || Registered
|}


In some cases, when the distance between the sensor and the receiver is long, or when there are many metal obstacles causing signal attenuation, customers can:
=== Mechanical ===
* Choose the '''LIGO AIR PRO''' model — increased transmission power
* Install a '''LIGO AIR Adapter''' at the receiver side — boost the received signal


{| class="wikitable"
{| class="wikitable"
! Device combination !! Bluetooth signal range
! Standard !! Rating
|-
|-
| LIGO AIR + Telematics (tracker) device || Standard distance
| IEC 60529 (Ingress Protection)   || IP69K
|-
| LIGO AIR + LIGO AIR Adapter            || '''2 ×''' Standard distance
|-
| LIGO AIR PRO + LIGO AIR Adapter        || '''4 ×''' Standard distance
|}
|}


== Warranty ==
=== Bluetooth Qualification ===
 
* Bluetooth Core Specification: 5.4
* Bluetooth SIG Member ID: ''(see [[LIGO Air Memberships]])''
* End Product Declaration ID: ''(see [[LIGO Air Memberships]])''
 
''Detailed certification information: see [[LIGO Air Certification & Approvals]]''
''Memberships information: see [[LIGO Air Memberships]]''
 
=== Warranty ===


* The warranty period is '''3 years''' from the date of shipment by the manufacturer.
* Warranty period: '''3 years''' from date of shipment
* The warranty period and service life '''do not apply to the battery'''.
* Battery NOT covered by warranty
* Compliance with the specified operating, transport, and storage conditions is a prerequisite for the manufacturer's guarantee.
* Warranty void if:
* The manufacturer reserves the right to modify the design and composition of the product without prior notice to the customer.
** Operating conditions exceed specifications
** Unauthorized modification or repair
** Damage from improper installation
** Damage from chemical exposure outside rated fluids


== Revision History ==
Contact SOJI Electronics for warranty claims.
 
== Support / Contact ==
 
For technical assistance, warranty claims, or product inquiries:


{| class="wikitable"
{| class="wikitable"
! Date !! Document !! Version !! Description
! Channel !! Contact
|-
|-
| 18/06/2025 || Datasheet  || 1.0  || Initial Release
| Website    || [https://sojielectronics.com sojielectronics.com]
|-
|-
| 14/07/2025 || Datasheet  || 1.0.3 || Minor changes
| Email      || support@sojielectronics.com
|-
|-
| 14/10/2025 || Datasheet  || 1.1  || Adding product variants
| Phone      || ''(insert customer support number)''
|-
|-
| 18/06/2025 || User Guide || 1.0  || Initial Release
| Address    || ''(insert SOJI Electronics JSC address)''
|}
 
=== Documentation ===
 
{| class="wikitable"
! Document !! Version !! Last Updated !! Action
|-
|-
| 14/07/2025 || User Guide || 1.0.4 || Minor changes
| LIGO AIR Datasheet
| 1.1
| 14/10/2025
| <span class="doc-view">[[Media:LIGO-AIR-Datasheet-V1.1.pdf|📄 View]]</span> &nbsp; <span class="doc-download">[[Media:LIGO-AIR-Datasheet-V1.1.pdf|⬇ Download]]</span>
|-
|-
| 14/10/2025 || User Guide || 1.1  || Minor changes
| LIGO AIR User Guide
| 1.2
| 04/11/2025
| <span class="doc-view">[[Media:LIGO-AIR-User-Guide-V1.2.pdf|📄 View]]</span> &nbsp; <span class="doc-download">[[Media:LIGO-AIR-User-Guide-V1.2.pdf|⬇ Download]]</span>
|-
|-
| 04/11/2025 || User Guide || 1.2  || Update sensor structure drawing
| LIGO AIR Protocol Integration
| 1.1
| 27/08/2025
| <span class="doc-view">[[Media:LIGO-AIR-Protocol-Integration-V1.1.pdf|📄 View]]</span> &nbsp; <span class="doc-download">[[Media:LIGO-AIR-Protocol-Integration-V1.1.pdf|⬇ Download]]</span>
|}
|}


=== Related Pages ===


* [[LIGO Air]] — Product overview
* [[LIGO Air Configuration]] — Detailed BLE protocol, payload format
* [[LIGO Air Certification & Approvals]] — Full certification list
* [[LIGO Air Nomenclature, classification codes]] — HS / ECCN codes
* [[Frequently Asked Questions - FAQ]] — Common questions
=== Revision History ===
{| class="wikitable"
! Date !! Version !! Description
|-
| 18/06/2025 || 1.0  || Initial release
|-
| 14/07/2025 || 1.0.4 || Minor changes
|-
| 14/10/2025 || 1.1  || Minor changes
|-
| 04/11/2025 || 1.2  || Update sensor structure drawing; restructure to IEC/IEEE 82079-1 compliance
|}


[[Category:LIGO Air]]
[[Category:LIGO Air]]

Revision as of 10:13, 13 May 2026

LIGO AIR User Guide v1.2 — Wireless Fuel Level Sensor Document version: 1.2 | Date: 04/11/2025 | Language: English

Safety Information

Read this section completely before installation or operation. Failure to observe these warnings may result in serious injury, death, or damage to equipment.

General Safety

The LIGO AIR fuel level sensor must be installed and operated only by qualified technicians familiar with fuel tank systems, electrical safety, and wireless device installation. Personal Protective Equipment (PPE) is required during installation.

⚠️ DANGER — Fire / Explosion Hazard
  • Hazard: Fuel vapors are highly flammable and can ignite from sparks, open flames, or static electricity
  • Consequence: Serious injury, death, or destruction of vehicle/equipment
  • Required action: Before drilling or installation, completely empty the fuel tank and ventilate all residual vapors. Use only non-sparking tools. Maintain fire extinguisher within 5 meters. No smoking or open flames within 10 meters of work area.
⚠️ WARNING — Mechanical / Pressure Hazard
  • Hazard: Pressurized fuel system may eject fluid under pressure
  • Consequence: Eye injury, skin chemical burns
  • Required action: Wear safety goggles and chemical-resistant gloves. Relieve fuel system pressure before opening tank. Allow tank to depressurize for at least 10 minutes.
⚠️ WARNING — Battery Hazard
  • Hazard: Lithium-Thionyl Chloride (Li-SOCl₂) battery contains hazardous chemicals
  • Consequence: Chemical burns if punctured. Fire risk if short-circuited or exposed to >100°C
  • Required action: Do not puncture, crush, disassemble, or incinerate the battery. Replace only with authorized SOJI battery part. Dispose at certified battery recycling facility.
⚠️ CAUTION — RF Exposure
  • Hazard: Bluetooth Low Energy radio emissions
  • Consequence: Possible RF exposure exceeding limits at very close range
  • Required action: Maintain minimum 20 cm distance between sensor and human body during prolonged operation. Comply with local RF exposure regulations.
ℹ️ NOTICE — Sensor Damage Prevention
  • Do not expose sensor to temperatures outside -40°C to +85°C operating range
  • Do not exceed IP69K conditions (no submersion beyond 1 m for 30 minutes)
  • Do not use sensor with conductive fluids (water, acids, alkalines)
  • Do not modify or attempt to repair the sensor housing

Emergency Procedures

In case of fire involving fuel vapor or sensor battery:

  1. Evacuate area immediately
  2. Use only Class B (flammable liquid) or Class D (metal/lithium) fire extinguishers — never water
  3. Contact emergency services
  4. Do not approach until area is declared safe

Product Overview

The LIGO AIR is a wireless fuel level sensor designed and manufactured by SOJI Electronics for measuring the level of liquid fuel and other non-conductive liquids in vehicle tanks and stationary fuel storage applications.

Equipped with Bluetooth Low Energy 5.4 technology, LIGO AIR enables seamless, real-time data transmission without requiring complex wiring. The heavy-duty metal structure provides protection against dust, moisture, vibration, and high-temperature environments.

File:LIGO-AIR-product-overview.png
LIGO AIR Wireless Fuel Level Sensor

Intended Use

LIGO AIR is intended for:

  • Fuel level measurement in diesel, gasoline, and non-conductive liquid tanks
  • Mobile applications: trucks, excavators, cement mixers, construction machinery
  • Stationary applications: marine vessels, generators, industrial oil storage tanks
  • Off-highway machinery in harsh environments

NOT Intended For

LIGO AIR is not intended for:

  • Measurement of conductive fluids (water, electrolytes, acids, alkalines)
  • Use in hazardous (ATEX/IECEx) zones unless specifically certified
  • Aviation, medical, or life-safety critical applications
  • Operation outside specified temperature range (-40 °C to +85 °C)

Product Variants

Variant Description Battery Life Range
LIGO AIR LxS Standard cost-effective version 6–8 years Standard
LIGO AIR LxT Extended-battery version 8–12 years Standard
LIGO AIR PRO Long-range version (high TX power) 6–8 years 2× Standard

Package Contents

Each LIGO AIR shipment includes:

No. Item Quantity
1 LIGO AIR Fuel Level Sensor (700/1000/1500 mm standard, custom on request) 01
2 Oil filter 01
3 Gasoline-resistant rubber gasket 01
4 Bottom-stop and springs 01
5 Self-drilling screw M4.8 × 32 mm 05
6 Rivet and screw M5 × 20 mm 05
7 Protective cap 01
8 Quick installation manual 01

Verify all items are present before installation. Contact SOJI Electronics if any item is missing or damaged.

Specifications

Parameter LIGO AIR (LxS, LxT) LIGO AIR-PRO
Standard length (L), mm 700, 1000, 1500 ... up to 6000 mm
Measuring error, % ± 0.5 %
Bluetooth specs Bluetooth 5.4, IEEE 802.15.4-2006, 2.4 GHz, -95 dBm sensitivity
TX power max: 6 dBm TX power max: 19.5 dBm
Advertising Protocol SOJI (default), Mielta, Escort — selectable in mobile app
Power supply 3.6V × 2600mAh (LxS) / 2400mAh (LxT) Li-SOCl₂ 3.6V × 3600mAh
Current (working mode), µA 9 27
Measurement interval (s) 5 to 10
Advertising interval (s) 5 to 10 10 to 15
Ingress protection IP69K
Operating temperature (°C) -40 to +85
Resolution (bit) 12
Accelerometer N/A Built-in
Memory Built-in 32 Mb EEPROM
Service life (expected), years 10
Storage condition 15 °C to 30 °C, RH < 60 %

Sensor Dimensions

File:LIGO-AIR-dimensions.png
LIGO AIR overall dimensions (mm)
Part Number Length L (mm)
LIGO AIR – L7S, L7T, LIGO AIR PRO – L7S 700 ± 3
LIGO AIR – L10S, L10T, LIGO AIR PRO – L10S 1000 ± 3
LIGO AIR – L15S, L15T, LIGO AIR PRO – L15S 1500 ± 3

Installation

Before installation: Read Safety Information section thoroughly.

Tools Required

  • Electric drill with Ø4 mm and Ø42 mm bits
  • M4.8 self-tapping screw driver (or M5 rivet tool depending on tank thickness)
  • Cutting tool for sensor tube (hacksaw or pipe cutter)
  • Deburring tool
  • Fuel-resistant RTV silicone gasket sealant
  • Mobile phone with LIGO BLE Configurator app installed
  • Personal Protective Equipment (PPE): safety goggles, chemical-resistant gloves

Step 1: Fuel Tank Preparation

  1. Empty the fuel tank completely. For gasoline tanks, ventilate all fuel vapors to prevent fire/explosion (see Safety)
  2. Clean and dry the tank interior
  3. Select installation location:
    • As close as possible to the tank's geometric center
    • At the tank's deepest point
    • Avoid contact with reinforcement ribs or internal equipment
File:LIGO-AIR-tank-location.png
Installation location — front, left, and top view

Step 2: Drilling Mounting Holes

Drill a central hole (Ø42 mm) and four mounting holes (Ø7 mm) as shown:

File:LIGO-AIR-drilling-pattern.png
Drilling pattern: Ø40 center hole + 4 × Ø4 mounting holes at 70.5 × 70.5 mm spacing
Tank wall thickness Fastener type Mounting hole
≤ 3 mm M5 rivet nut 4 × Ø7 mm
> 3 mm M4.8 self-tapping screw 4 × Ø7 mm
ℹ️ NOTICE — Sensor Orientation
Mounting hole positions must ensure the sensor's directional arrow points toward the BLE receiver. Incorrect orientation will severely reduce wireless range.

Step 3: Sensor Tube Preparation

Cut the sensor tube to length: 

 L = H − 25 mm

Where:

  • L = final tube length after cutting
  • H = height of the tank at the installation point

After cutting:

  1. Remove all burrs with deburring tool
  2. Clean the tube interior with fuel
⚠️ WARNING
Minimum tube length after cutting is 150 mm (15 cm). Shorter tubes will not function correctly.

Step 4: Install Bottom-Stop and Filter

Install the bottom-stop and oil filter in sequence as shown:

File:LIGO-AIR-bottom-stop-filter.png
Bottom-stop spring and oil filter installation

Step 5: Mount Sensor on Fuel Tank

  1. Apply fuel-resistant RTV silicone gasket sealant to:
    • Tank surface around the central hole
    • Gasket (both sides)
    • Sensor flange
  2. Insert the LIGO AIR sensor through the central hole
  3. Align so the directional arrow points toward the BLE receiver
  4. Fasten using appropriate screws (self-tapping or rivet)
File:LIGO-AIR-orientation-examples.png
Correct (✓) vs incorrect (✗) sensor orientations

Step 6: Verify Installation Clearance

Ensure a minimum clearance of 150 mm between the top of the sensor and any overhead metal surface to avoid BLE signal attenuation.

File:LIGO-AIR-clearance.png
Minimum 150 mm clearance from overhead metal

After mounting, proceed to Configuration.

Configuration

LIGO AIR is configured via the LIGO BLE Configurator mobile application.

Mobile App Installation

Download LIGO BLE Configurator from:

  • iOS: App Store
  • Android: Google Play

After installation, grant all permissions requested by the app:

  • Camera (for QR code scanning)
  • Location (required by Android for BLE scanning)
  • Nearby devices / Bluetooth
File:LIGO-AIR-app-permissions.png
Granting app permissions

Connecting to the Sensor

  1. Open the LIGO BLE Configurator app
  2. Tap LIGO AIR in the product list
  3. Scan the area — the app will list discovered sensors
  4. Tap Connect next to the desired sensor

Each sensor shows:

  • Name (e.g., LIGO AIR_7EEF7E7F)
  • RSSI (signal strength, should be ≥ -80 dBm)
  • Temperature
  • Current fuel level
  • Battery voltage (Vbat)
  • Firmware version (FW)
File:LIGO-AIR-device-list.png
Selecting LIGO AIR from device list

Calibration: Set Empty / Set Full

After installation, calibrate the sensor:

Step 1: Set Full

  1. Immerse the sensor in fuel until fuel reaches the sensor flange
  2. Wait for C_working value to stabilize (~30 seconds)
  3. Press Set Full button in the app
File:LIGO-AIR-set-full.png
Set Full procedure

Step 2: Set Empty

  1. Remove the sensor from fuel
  2. Wait 1–2 minutes for fuel to drain from the measuring probe
  3. Press Set Empty button in the app
File:LIGO-AIR-set-empty.png
Set Empty procedure

Configurable Parameters

Parameter Default Range / Options
Device name LIGO AIR_<MAC> Customizable
Advertising protocol SOJI SOJI / Mielta / Escort
Measurement interval 5–10 s 5 to 60 s
Advertising interval 5–10 s 5–10 s (LIGO AIR), 10–15 s (PRO)
Output mode 0–4095 raw 0–1023 raw / 0–4095 raw / Liters
Password (default) CHANGE before deployment
ℹ️ Security Recommendation
Change the default password immediately after first connection to prevent unauthorized configuration changes.

Operation

After installation and calibration, LIGO AIR operates autonomously, transmitting fuel level data via BLE advertising packets at configured intervals.

Calibration Table

LIGO AIR supports two calibration methods:

Method Description Recommended
On Platform (Server) Sensor sends raw values (0–4095). Server converts to volume (liters) using calibration table. ✓ Recommended
On Sensor Sensor sends volume values directly using internal calibration table.

The manufacturer recommends platform calibration for fleet management scenarios because:

  • Single source of truth on the server
  • Easier to update calibration across multiple sensors
  • Reduces sensor memory load

Reading Sensor Data

LIGO AIR data is received by:

  • Telematics device (FM tracker) with BLE scanning
  • Smartphone with LIGO BLE Configurator app

For protocol integration details, see Protocol Integration.

Long-Range Operation

For challenging environments (long distance, metal obstacles):

Combination Range
LIGO AIR + Telematics device Standard
LIGO AIR + LIGO AIR Adapter 2× Standard
LIGO AIR PRO + LIGO AIR Adapter 4× Standard

Installing the Protective Cap

After installation and calibration are complete, install the protective cap to prevent unauthorized access and protect against environmental damage.

File:LIGO-AIR-cap-install.png
Push the cap until it clicks into place

For inspection, remove the cap as shown:

File:LIGO-AIR-cap-removal.png
Correct (✓) vs incorrect (✗) cap removal procedure

Troubleshooting

Symptom Possible Cause Solution
Sensor not found in app's device list
  • Bluetooth disabled on phone
  • Sensor in storage mode (not yet activated)
  • Sensor out of range (>50 m)
  • Metal obstruction blocking signal
  • Enable Bluetooth, restart app
  • Move within 1 m of sensor and retry
  • Use LIGO AIR Adapter to boost reception
  • Verify orientation (directional arrow toward receiver)
Connection drops frequently
  • RSSI weaker than -80 dBm
  • High RF interference (other 2.4 GHz devices)
  • Tank metal interference
  • Reposition receiver closer
  • Use LIGO AIR PRO + Adapter
  • Reorient sensor (arrow toward receiver)
Fuel reading inaccurate
  • Calibration error
  • Sensor tube damaged or bent
  • Filter clogged with debris
  • Wrong calibration table on platform
  • Recalibrate using Set Empty / Set Full
  • Inspect probe, replace if bent
  • Clean or replace oil filter
  • Verify calibration table values
Reading shows fixed value (no change)
  • Sensor electronics frozen
  • Storage mode not deactivated
  • Disconnect and reconnect via app
  • Power-cycle by removing/inserting battery
Battery voltage drops rapidly
  • Battery near end of life (8+ years)
  • Measurement interval too short
  • Operating in temperature extremes
  • Replace battery (see Maintenance)
  • Increase measurement interval
  • Verify operating temperature within range
Sensor reports incorrect temperature
  • Sensor near heat source (engine, exhaust)
  • Sensor still warming up after installation
  • Relocate sensor away from heat sources
  • Wait 10 minutes for thermal equilibrium
App permission denied
  • Camera/Location/Bluetooth permissions not granted
  • Phone Settings → Apps → LIGO BLE Configurator → Permissions → Grant all
Forgot password
  • Custom password set, then lost
  • Contact SOJI Support (proof of ownership required for reset)

If problem persists after troubleshooting, contact Support.

Maintenance

Periodic Inspection

Frequency Action
Monthly Verify sensor reports data via mobile app or telematics platform
Quarterly Check protective cap integrity. Verify mounting screws still secure.
Annually Remove sensor, clean filter, inspect probe for damage. Verify gasket seal still functional.
Every 5 years Check battery voltage trend. If below 3.4V consistently, plan battery replacement.
Every 8–10 years Replace battery (Li-SOCl₂ 3.6V).

Cleaning

  1. Disconnect sensor from fuel tank (drain tank if necessary)
  2. Wipe external surface with dry cloth or cloth lightly dampened with non-conductive cleaner
  3. Do NOT use:
    • Solvents (acetone, benzene)
    • Abrasive materials
    • High-pressure water beyond IP69K rating
  4. Inspect and clean the oil filter — replace if clogged
  5. Reinstall with new gasket sealant

Battery Replacement

⚠️ WARNING — Battery Replacement Safety
  • Replace only with authorized SOJI Li-SOCl₂ 3.6V battery (part numbers vary by variant)
  • Disconnect sensor from fuel tank before opening
  • Ensure work area is ventilated and free of ignition sources
  • Wear chemical-resistant gloves
  1. Remove protective cap
  2. Loosen 4 mounting screws (do not remove from tank)
  3. Lift sensor housing off the tank
  4. Open battery compartment per technical instruction
  5. Remove old battery — observe polarity
  6. Install new battery — match polarity markers
  7. Close battery compartment
  8. Reassemble sensor and verify operation with mobile app

Calibration Verification

After any maintenance involving probe replacement or modification, re-perform Set Empty / Set Full calibration (see Configuration).

Disposal / End-of-Life

LIGO AIR contains a lithium battery and electronic components subject to WEEE (Waste Electrical and Electronic Equipment) regulations.

  1. Remove battery and dispose separately at certified battery recycling facility
  2. Send sensor body to electronic waste recycling
  3. Do NOT dispose in regular trash or landfill
  4. In EU: Take-back via local WEEE registration scheme

Certification / Compliance

LIGO AIR is manufactured to meet international standards and regulations.

Wireless / Radio

Region Standard / Approval
EU RED 2014/53/EU, EMC 2014/30/EU
US FCC Part 15.247
Canada ISED RSS-247, RSS-Gen, ICES-003
UK UKCA, UK RED
Japan MIC (Telec)

Environmental

Standard Status
RoHS 3 (2011/65/EU + 2015/863) Compliant
REACH (EU Regulation 1907/2006) Compliant
WEEE (2012/19/EU) Registered
Battery WEEE (2006/66/EC) Registered

Mechanical

Standard Rating
IEC 60529 (Ingress Protection) IP69K

Bluetooth Qualification

Detailed certification information: see LIGO Air Certification & Approvals Memberships information: see LIGO Air Memberships

Warranty

  • Warranty period: 3 years from date of shipment
  • Battery NOT covered by warranty
  • Warranty void if:
    • Operating conditions exceed specifications
    • Unauthorized modification or repair
    • Damage from improper installation
    • Damage from chemical exposure outside rated fluids

Contact SOJI Electronics for warranty claims.

Support / Contact

For technical assistance, warranty claims, or product inquiries:

Channel Contact
Website sojielectronics.com
Email support@sojielectronics.com
Phone (insert customer support number)
Address (insert SOJI Electronics JSC address)

Documentation

Document Version Last Updated Action
LIGO AIR Datasheet 1.1 14/10/2025 📄 View   ⬇ Download
LIGO AIR User Guide 1.2 04/11/2025 📄 View   ⬇ Download
LIGO AIR Protocol Integration 1.1 27/08/2025 📄 View   ⬇ Download

Revision History

Date Version Description
18/06/2025 1.0 Initial release
14/07/2025 1.0.4 Minor changes
14/10/2025 1.1 Minor changes
04/11/2025 1.2 Update sensor structure drawing; restructure to IEC/IEEE 82079-1 compliance
SOJI Electronics
Retrieved from "https://wiki.sojielectronics.com/index.php?title=LIGO_AIR_User_Guide&oldid=396"