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== Safety Information ==
== Safety Information ==
<div class="dim">


''This section documents all safety-related information per IEC/IEEE 82079-1 and ANSI Z535.6 standards.''
This user guide must be read in full before installing or operating the LIGO AIR fuel level sensor. Installation must be performed by qualified technicians, engineers, or system integrators familiar with fuel tank handling and intrinsic-safety practices.


'''What to fill in:'''
{{Danger|title=Fire / Explosion Hazard|body=For gasoline fuel tanks, all fuel vapors '''must''' be completely removed before installation. Empty, clean and dry the tank thoroughly. Failure to do so may cause fire or explosion during drilling and mechanical work.}}
* General safety requirements (PPE, qualified personnel, working conditions)
* Specific hazards using callouts:
** <code><nowiki>{{Danger|title=...|body=...}}</nowiki></code> — imminent hazard, death/serious injury
** <code><nowiki>{{Warning|title=...|body=...}}</nowiki></code> — potential hazard, possible injury
** <code><nowiki>{{Caution|title=...|body=...}}</nowiki></code> — potential equipment damage
** <code><nowiki>{{Notice|title=...|body=...}}</nowiki></code> — important info, no hazard
* Emergency procedures (fire, electric shock, chemical exposure, evacuation)
* Emergency contact numbers


'''Example callout:'''
{{Warning|title=Signal Integrity & Cybersecurity|body=
{{Notice|title=Sample Notice|body=Read entire guide before installation. Qualified technicians only. Wear PPE.}}
* Install the sensor with the directional arrow on the cover pointing toward the receiving device.
* Ensure RSSI at the receiver is '''not less than &minus;80 dBm'''. Use a LIGO PRO or LIGO AIR Adapter if signal is weaker.
* '''Change the default password''' provided by the manufacturer immediately after first pairing to prevent unauthorized access.
}}


</div>
{{Caution|title=Mechanical Constraints|body=
* Minimum tube length after cutting: '''150 mm (15 cm)'''.
* No metal plate must cover the sensor head — it will block the Bluetooth signal.
* Maintain a minimum '''150 mm clearance''' between the top of the sensor and any overhead metal surface.
* Avoid contact with reinforcement ribs or other equipment inside the tank.
}}
 
{{Notice|title=Required PPE & Conditions|body=Wear fuel-resistant gloves and eye protection. Work in a well-ventilated area, away from open flames and ignition sources. Follow local regulations for handling flammable liquids.}}


== Product Overview ==
== Product Overview ==
<div class="dim">


''Introduce the product: what it is, what it does, and key value proposition.''
The '''LIGO AIR''' is a precision Bluetooth fuel level sensor designed by SOJI Electronics for accurate, reliable measurement of fuel levels in tanks. It targets fleet telematics, industrial fuel storage, and vehicle fuel monitoring applications. Built on Bluetooth 5.4 with a sealed IP69K housing and a Li-SOCl₂ primary battery rated for ~10 years of service, the sensor transmits level data wirelessly to a paired telematics device or gateway — eliminating wired sensor harnesses.


'''What to fill in:'''
Two product families are available: the standard '''LIGO AIR''' (LxS / LxT) and the long-range '''LIGO AIR PRO''' (Lx S) with higher TX power for challenging environments.
* 1–2 paragraph product description: name, category, primary function, key features
* '''Intended Use''' — bullet list of applications the product is designed for
* '''NOT Intended For''' — bullet list of excluded applications (safety/regulatory)
* '''Product Variants''' — table of variants if multiple SKUs exist (Variant / Description / Use Case)


'''Example structure:'''
=== Intended Use ===
* Paragraph: "The [Product Name] is a [type] device designed for [primary application]..."
* Fleet vehicle fuel monitoring (trucks, buses, construction equipment).
* Variants table with columns: Variant | Description | Use Case
* Stationary fuel storage tanks at depots and job sites.
* Telematics integration via Bluetooth-capable tracker devices.
* Diesel, gasoline, and compatible liquid fuel measurement.


</div>
=== NOT Intended For ===
* Tanks containing fuel vapors that have not been purged (explosion risk during installation).
* Tube lengths shorter than 150 mm after cutting.
* Mounting under or behind metal covers that block the Bluetooth signal path.
* Use without changing the default password (security risk).


== Package Contents ==
=== Product Variants ===
<div class="dim">


''List everything included in the shipment box.''
{| class="wikitable"
|-
! Manufacturer Part Number !! Standard Length L (mm) !! Notes
|-
| 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 ||
|-
| Custom lengths || up to 6000 mm || Contact manufacturer for customised lengths.
|}


'''What to fill in:''' table with columns:
== Package Contents ==
* '''No.''' — item number (1, 2, 3, ...)
* '''Item''' — item name (vd: "Main sensor unit", "Mounting bracket", "Connection cable 2m")
* '''Quantity''' — quantity per package (vd: 01, 02)


'''Important note to include:''' "Verify all items are present before installation. Contact support if any item is missing or damaged."
Verify all items are present before installation. Contact support if any item is missing or damaged.


</div>
{| class="wikitable"
|-
! No. !! Item !! Quantity
|-
| 1 || LIGO AIR Fuel Level Sensor (standard lengths 700 / 1000 / 1500 mm; custom lengths 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 || User manual || 01
|}


== Specifications ==
== Specifications ==
<div class="dim">


''Technical specifications of the product per IEC/IEEE 82079-1.''
=== Technical Specifications ===


'''What to fill in:''' specification table with columns Parameter / Value / Unit, covering:
{| class="wikitable"
* Mechanical: Dimensions (L × W × H), Weight
|-
* Environmental: Operating temperature, Storage temperature, Ingress protection (IP)
! Parameter !! LIGO AIR (LxS, LxT) !! LIGO AIR PRO !! Unit
* Electrical: Power supply, Current consumption (avg/peak/sleep)
|-
* Wireless (if applicable): Bluetooth/WiFi/LoRa protocol
| Standard length (L) || colspan="2" | 700, 1000, 1500 … up to 6000 || mm
* Service life (expected years)
|-
| Measuring error || colspan="2" | ± 0.5 || %
|-
| Bluetooth specs || colspan="2" | Bluetooth 5.4, IEEE 802.15.4-2006, 2.4 GHz, −95 dBm sensitivity ||
|-
| TX power (max) || 6 || 19.5 || dBm
|-
| Advertising Protocol || colspan="2" | SOJI Protocol (default); Mielta Protocol or Escort Protocol (configurable via mobile app) ||
|-
| Power supply || Li-SOCl₂ 3.6 V × 2600 mAh || Li-SOCl₂ 3.6 V × 3600 mAh ||
|-
| Current consumption (working mode) || 9 || 27 || µA
|-
| Measurement interval || colspan="2" | 5 to 10 || s
|-
| Advertising message interval || 5 to 10 || 10 to 15 || s
|-
| Ingress protection rating || colspan="2" | IP69K ||
|-
| Operating temperature || colspan="2" | −40 to +85 || °C
|-
| Resolution || colspan="2" | 12 || bit
|-
| Accelerometer || colspan="2" | Built-in ||
|-
| Memory || colspan="2" | Built-in 32 Mb EEPROM ||
|-
| Average sampling period || colspan="2" | 5 to 60 || s
|-
| Temperature measurement absolute error || colspan="2" | ± 2 || °C
|-
| Average service life (expected) || colspan="2" | 10 || years
|-
| Storage condition || colspan="2" | 15 °C to 30 °C, RH < 60 % ||
|}


'''Sub-sections to consider:'''
=== Dimensions ===
* '''Technical Specifications''' — main spec table
* '''Dimensions''' — mechanical drawing image (upload as "Product-dimensions.png")
* '''Pinout/Connector''' (if applicable)


</div>
See mechanical drawing: [[File:LIGO-AIR-dimensions.png|center|400px|thumb|LIGO AIR mechanical dimensions]]


== Installation ==
== Installation ==
<div class="dim">


''Step-by-step installation procedure.''
'''Before installation:''' Read the [[#Safety Information|Safety Information]] section in full.
 
=== Tools Required ===
* Drill with Ø42 mm hole saw + Ø7 mm drill bit
* Tube cutter or hacksaw + deburring tool
* Screwdriver (for M4.8 self-drilling screws or M5 rivet nut tool)
* Fuel-resistant RTV silicone gasket maker
* Smartphone (iOS or Android) with '''LIGO BLE Configurator''' app installed
* PPE: fuel-resistant gloves, safety glasses, ventilation
 
=== Step 1: Site / Fuel Tank Preparation ===
 
# Empty the tank, then clean and dry it. '''For gasoline tanks, purge all fuel vapors before drilling''' to prevent fire or explosion.
# Select the installation location:
#* As close as possible to the geometric center of the tank, at the deepest point.
#* Avoid contact with reinforcement ribs or any internal equipment.
#* Mounting orientation must allow the directional arrow on the sensor cover to point toward the receiving device (max signal transmission direction).
# Drill the central hole '''Ø42 mm''', then drill four additional Ø7 mm holes for mounting screws.
 
'''Mounting hardware selection by tank wall thickness:'''
{| class="wikitable"
|-
! Wall Thickness !! Recommended Fastener !! Mounting Hole
|-
| ≤ 3 mm || M5 rivet nut || 4 × Ø7 mm
|-
| > 3 mm || M4.8 self-tapping screw || 4 × Ø7 mm
|}
 
=== Step 2: Sensor Preparation ===
 
'''Cut the sensor tube to length:'''
 
  L = H − 25 mm


'''Pre-requisite:''' "Before installation: Read [[#Safety Information|Safety Information]] section."
Where:
* '''L''' — final tube length after cutting
* '''H''' — height of the tank at the installation point


'''What to fill in (sub-sections):'''
After cutting, remove all burrs and clean the tube using fuel.
* '''Tools Required''' — bullet list of tools + PPE
* '''Step 1: Site Preparation''' — clean mounting surface, clearance, power off
* '''Step 2: Mounting''' — physical mounting procedure with torque values
* '''Step 3: Connection''' — electrical/wireless connection with wire color codes
* '''Step 4: Verification''' — how to verify installation (LED status, app discovery)


'''Optional:''' mounting diagram image (upload as "Product-mounting.png")
{{Caution|title=Minimum Tube Length|body=The tube length after cutting '''must be at least 150 mm (15 cm)'''. Shorter tubes are not supported.}}


</div>
Install the bottom-stop, springs, and oil filter onto the tube in sequence.
 
=== Step 3: Mounting on the Fuel Tank ===
 
# Apply fuel-resistant RTV silicone gasket maker to the fuel tank surface, gasket, and sensor flange.
# Insert the LIGO AIR sensor into the tank.
# Fasten securely using the appropriate fasteners (self-tapping screws or rivet nut as per wall thickness above).
# Confirm the directional arrow on the cover points toward the receiving device.
 
[[File:LIGO-AIR-mounting.png|center|500px|thumb|LIGO AIR mounting on fuel tank]]
 
=== Step 4: Verification ===
* Confirm a minimum '''150 mm clearance''' between the sensor top and any overhead metal surface.
* Confirm no metal plate covers the sensor head.
* Power-cycle/wake the sensor and proceed to [[#Configuration|Configuration]].


== Configuration ==
== Configuration ==
<div class="dim">


''Software setup after physical installation.''
=== Mobile Application ===
 
Download '''LIGO BLE Configurator''':
* iOS — App Store
* Android — Google Play
 
{{Notice|title=Permissions|body=For full operation, grant all permissions requested by the app (Bluetooth, location, storage).}}


'''What to fill in (sub-sections):'''
Detailed app usage is documented in the ''LIGO BLE Configurator App User Guide''.
* '''Mobile Application''' — iOS/Android app download links + required permissions
* '''Connecting Sensor''' — numbered steps to discover and pair device
* '''Calibration''' — calibration procedure (Set Full, Set Empty, etc.)
* '''Configurable Parameters''' — table with columns: Parameter / Default / Range / Description
** Common params: Device name, Measurement interval, Output protocol, Password


</div>
=== Connecting Sensor ===
 
# Open the LIGO BLE Configurator app.
# The app scans for nearby LIGO AIR sensors.
# Select the target sensor from the discovered list to establish a Bluetooth connection.
# When prompted, enter the device password. '''Change the default password immediately''' after the first successful connection.
 
=== Calibration: Set Empty and Set Full ===
 
After mounting and pairing, calibrate the sensor before deployment:
 
'''Step 1 — Set Full:'''
* Immerse the sensor in fuel until the fuel reaches the sensor flange.
* Wait for the '''C_working''' value to stabilize.
* Press '''Set Full'''.
 
'''Step 2 — Set Empty:'''
* Remove the sensor from the fuel.
* Wait 1–2 minutes to allow fuel to drain from the measuring probe.
* Press '''Set Empty'''.
 
=== Configurable Parameters ===
 
{| class="wikitable"
|-
! Parameter !! Default !! Range / Options !! Description
|-
| Advertising Protocol || SOJI Protocol || SOJI / Mielta / Escort || Output protocol for the advertising message.
|-
| Measurement interval || — || 5 – 10 s || How often the sensor samples the fuel level.
|-
| Advertising interval || — || 5 – 10 s (AIR) / 10 – 15 s (PRO) || How often advertising messages are broadcast.
|-
| Average sampling period || — || 5 – 60 s || Averaging window for the reported value.
|-
| Password || Manufacturer default || User-defined || '''Must''' be changed at first setup.
|}


== Operation ==
== Operation ==
<div class="dim">


''Day-to-day usage instructions for end users.''
=== Reading Data ===


'''What to fill in (sub-sections):'''
The sensor broadcasts level data over Bluetooth advertising. Data is received by a paired telematics tracker, gateway, or the LIGO BLE Configurator app, then forwarded to a telematics platform or fleet management server.
* '''Reading Data''' — how data is delivered (gateway, app, cloud)
* '''Calibration Methods''' — table of available calibration methods with recommended option
* '''Long-Range Operation''' — range settings for challenging environments
* '''Protective Accessories''' — optional caps/housings if applicable
* '''Operating Modes''' — normal/diagnostic/sleep modes if applicable


</div>
=== Calibration Methods ===
 
{| class="wikitable"
|-
! Method !! Description !! Recommended
|-
| Calibration on the Platform (server) || Sensor sends raw level values (0–4095) to the server via the telematics device; the platform converts to volume (liters) using a calibration table. || ✅ '''Recommended by manufacturer for LIGO AIR.'''
|-
| Calibration on the Sensor || Sensor directly transmits volume values (liters) based on an internal calibration table. ||
|}
 
=== Long-Range Operation ===
 
For long-distance transmission or environments with metal obstacles causing signal attenuation, choose LIGO AIR PRO (higher TX power) or add a LIGO AIR Adapter on the receiver side to boost signal reception.
 
{| class="wikitable"
|-
! Device Combination !! Bluetooth Signal Range
|-
| LIGO AIR + Telematics (tracker) device || Standard distance
|-
| LIGO AIR + LIGO AIR Adapter || 2 × Standard distance
|-
| LIGO AIR PRO + LIGO AIR Adapter || 4 × Standard distance
|}
 
=== Protective Accessories ===
 
'''Protective cap''' — install '''after''' the sensor is mounted and calibration is complete. The cap prevents unauthorized access and protects against UV, impact, and other environmental factors.
 
* '''Install:''' push the cap down until it clicks into place, indicating it is fully seated.
* '''Remove (for inspection):''' follow the removal procedure shown in the user manual to avoid damaging sensor parts.
 
{{Caution|title=Cap Removal|body=Ensure no sensor parts are damaged while removing the protective cap.}}


== Troubleshooting ==
== Troubleshooting ==
<div class="dim">


''Common problems and solutions for end users.''
{| class="wikitable"
|-
! Symptom !! Possible Cause !! Solution
|-
| Sensor not discovered by LIGO BLE Configurator app
|
* Sensor outside Bluetooth range
* Metal obstruction blocking sensor head
* Sensor battery depleted (end of service life)
* App permissions not granted
|
* Move within range; verify line-of-sight
* Remove any metal plate above sensor
* Verify sensor age vs ~10-year service life
* Re-grant Bluetooth & location permissions
|-
| RSSI at receiver below −80 dBm
|
* Distance too far
* Metal obstruction in signal path
* Sensor orientation wrong (arrow not toward receiver)
|
* Use LIGO AIR PRO or add LIGO AIR Adapter
* Re-route or remove obstruction
* Re-mount sensor so directional arrow points to receiver
|-
| Level reading unstable / not stabilizing during Set Full
|
* Fuel level below sensor flange
* Air bubbles in measuring tube
* Tube not properly cleaned after cutting
|
* Top up fuel until it reaches the flange
* Wait longer (>2 min) for stabilization
* Remove sensor, clean tube with fuel, re-install
|-
| Reading shows 0% after Set Empty when fuel is present
|
* Set Empty / Set Full procedure executed in wrong order
* Tube damaged or burrs not removed
|
* Repeat calibration: Set Full first (immersed), then Set Empty (drained)
* Inspect tube, deburr, re-cut if necessary
|-
| Cannot connect with default password (login refused)
|
* Default password already changed by previous user
|
* Contact the previous installer or factory-reset via support
|}
 
If the problem persists, contact [[#Support / Contact|Support]].
 
== Maintenance ==
 
=== Periodic Inspection ===
 
{| class="wikitable"
|-
! Frequency !! Action
|-
| Monthly || Visual inspection of sensor cover, cable entry, and protective cap for damage or tampering.
|-
| Quarterly || Verify RSSI ≥ −80 dBm at receiver; check directional alignment.
|-
| Annually || Verify calibration on the platform; confirm advertising protocol/interval settings.
|-
| ~10 years (end of service life) || Replace sensor — Li-SOCl₂ primary battery is non-replaceable; expected service life is 10 years.
|}
 
=== Cleaning ===


'''What to fill in:''' table with columns:
* Clean the external housing with a soft cloth and mild detergent.
* '''Symptom''' — what user observes (vd: "Device does not power on", "No Bluetooth connection")
* For the measuring tube, clean with clean fuel.
* '''Possible Cause''' — bullet list of potential causes
* '''Do NOT use''' solvents, abrasive materials, high-pressure water jets directed at the cover, or alcohol-based cleaners on the sealed electronics housing (IP69K rating preserved only when housing is intact).
* '''Solution''' — bullet list of step-by-step solutions


'''Closing note:''' "If problem persists, contact [[#Support / Contact|Support]]."
=== Calibration Verification ===


</div>
After any maintenance that disturbs the sensor mounting or tube, re-run the '''Set Full / Set Empty''' procedure (see [[#Configuration|Configuration]]).


== Maintenance ==
=== Battery Replacement ===
<div class="dim">


''Periodic maintenance and end-of-life procedures.''
The Li-SOCl₂ battery is sealed inside the device and is '''not user-replaceable'''. When the sensor reaches end of service life (~10 years), replace the entire unit and recycle the old unit per local WEEE / battery regulations.


'''What to fill in (sub-sections):'''
{{Warning|title=Battery Safety|body=Do not attempt to open the sensor housing or replace the internal battery. Li-SOCl₂ cells can leak, vent, or rupture if mishandled. Return spent units to SOJI Electronics or an authorised recycler.}}
* '''Periodic Inspection''' — table: Frequency (Monthly/Quarterly/Annually/5-year/8-10 year) / Action
* '''Cleaning''' — procedure with prohibited materials (solvents, abrasives)
* '''Battery Replacement''' (if applicable) — procedure + safety warnings
* '''Calibration Verification''' — re-calibration after maintenance
* '''Disposal / End-of-Life''' — recycling instructions per WEEE/RoHS


'''Required safety callout:'''
=== Disposal / End-of-Life ===
{{Warning|title=Battery Replacement Safety|body=Replace only with authorized part. Disconnect before opening. Wear chemical-resistant gloves. Observe correct polarity.}}


</div>
* Recycle per WEEE Directive (EU 2012/19/EU) and local equivalents.
* Lithium battery — return to a certified battery recycling facility.
* Do not incinerate or crush the unit.


== Certification / Compliance ==
== Certification / Compliance ==
<div class="dim">


''Regulatory certifications and standards compliance.''
=== Mechanical ===


'''What to fill in (sub-sections with tables):'''
{| class="wikitable"
* '''Wireless / Radio''' — Region / Standard / Status (CE RED, FCC Part 15, ISED RSS, UKCA)
|-
* '''Environmental''' — Standard / Status (RoHS 3, REACH, WEEE, Battery WEEE)
! Standard !! Rating
* '''Mechanical''' — Standard / Rating (IEC 60529 IP rating)
|-
* '''Bluetooth Qualification''' (if applicable) — QDID, SIG Member ID, EPDID
| IEC 60529 — Ingress Protection || IP69K
* '''Warranty''' — period, exclusions, void conditions
|-
| Operating temperature range || −40 °C to +85 °C
|}


'''Cross-references:'''
=== Wireless / Radio ===
* See [[Product Certification & Approvals]] for detailed certificates
* See [[Product Memberships]] for SIG memberships


</div>
{| class="wikitable"
|-
! Region / Standard !! Status
|-
| Bluetooth 5.4 (Bluetooth SIG) || Compliant
|-
| IEEE 802.15.4-2006 (2.4 GHz) || Compliant
|-
| CE RED || ''Refer to [[Product Certification & Approvals]]''
|-
| FCC Part 15 || ''Refer to [[Product Certification & Approvals]]''
|-
| ISED RSS (Canada) || ''Refer to [[Product Certification & Approvals]]''
|-
| UKCA || ''Refer to [[Product Certification & Approvals]]''
|}
 
=== Environmental ===
 
{| class="wikitable"
|-
! Standard !! Status
|-
| RoHS 3 (EU 2015/863) || ''Refer to [[Product Certification & Approvals]]''
|-
| REACH || ''Refer to [[Product Certification & Approvals]]''
|-
| WEEE || ''Refer to [[Product Certification & Approvals]]''
|-
| Battery WEEE / Battery Directive || ''Refer to [[Product Certification & Approvals]]''
|}
 
=== Bluetooth Qualification ===
 
''Refer to [[Product Memberships]] for SIG Member ID, QDID, and EPDID details.''
 
=== Warranty ===
 
Warranty period, exclusions, and void conditions are defined in the SOJI Electronics standard warranty terms. Contact [[#Support / Contact|Support]] for the current warranty document.


== Support / Contact ==
== Support / Contact ==
<div class="dim">
''Customer support channels.''


'''What to fill in:''' contact table with rows:
{| class="wikitable"
* '''Website''' — sojielectronics.com
|-
* '''Email''' — support@sojielectronics.com
! Channel !! Detail
* '''Phone''' — support number
|-
* '''Address''' — full company address
| Website || [https://sojielectronics.com sojielectronics.com]
* '''Service hours''' — vd: "Mon–Fri, 08:00–17:00 GMT+7"
|-
| Email || support@sojielectronics.com
|-
| Phone || ''(see official website for current support line)''
|-
| Address || SOJI Electronics Joint Stock Company — ''(see official website for current address)''
|-
| Service hours || Mon – Fri, 08:00 – 17:00 GMT+7
|}


</div>
<div class="noprint">
<div class="noprint">
== Related Documents ==
== Related Documents ==

Revision as of 08:21, 5 June 2026

Safety Information

This user guide must be read in full before installing or operating the LIGO AIR fuel level sensor. Installation must be performed by qualified technicians, engineers, or system integrators familiar with fuel tank handling and intrinsic-safety practices.

⚠️ DANGER — Fire / Explosion Hazard

For gasoline fuel tanks, all fuel vapors must be completely removed before installation. Empty, clean and dry the tank thoroughly. Failure to do so may cause fire or explosion during drilling and mechanical work.

⚠️ WARNING — Signal Integrity & Cybersecurity
  • Install the sensor with the directional arrow on the cover pointing toward the receiving device.
  • Ensure RSSI at the receiver is not less than −80 dBm. Use a LIGO PRO or LIGO AIR Adapter if signal is weaker.
  • Change the default password provided by the manufacturer immediately after first pairing to prevent unauthorized access.
⚠️ CAUTION — Mechanical Constraints
  • Minimum tube length after cutting: 150 mm (15 cm).
  • No metal plate must cover the sensor head — it will block the Bluetooth signal.
  • Maintain a minimum 150 mm clearance between the top of the sensor and any overhead metal surface.
  • Avoid contact with reinforcement ribs or other equipment inside the tank.
ℹ️ NOTICE — Required PPE & Conditions

Wear fuel-resistant gloves and eye protection. Work in a well-ventilated area, away from open flames and ignition sources. Follow local regulations for handling flammable liquids.

Product Overview

The LIGO AIR is a precision Bluetooth fuel level sensor designed by SOJI Electronics for accurate, reliable measurement of fuel levels in tanks. It targets fleet telematics, industrial fuel storage, and vehicle fuel monitoring applications. Built on Bluetooth 5.4 with a sealed IP69K housing and a Li-SOCl₂ primary battery rated for ~10 years of service, the sensor transmits level data wirelessly to a paired telematics device or gateway — eliminating wired sensor harnesses.

Two product families are available: the standard LIGO AIR (LxS / LxT) and the long-range LIGO AIR PRO (Lx S) with higher TX power for challenging environments.

Intended Use

  • Fleet vehicle fuel monitoring (trucks, buses, construction equipment).
  • Stationary fuel storage tanks at depots and job sites.
  • Telematics integration via Bluetooth-capable tracker devices.
  • Diesel, gasoline, and compatible liquid fuel measurement.

NOT Intended For

  • Tanks containing fuel vapors that have not been purged (explosion risk during installation).
  • Tube lengths shorter than 150 mm after cutting.
  • Mounting under or behind metal covers that block the Bluetooth signal path.
  • Use without changing the default password (security risk).

Product Variants

Manufacturer Part Number Standard Length L (mm) Notes
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
Custom lengths up to 6000 mm Contact manufacturer for customised lengths.

Package Contents

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

No. Item Quantity
1 LIGO AIR Fuel Level Sensor (standard lengths 700 / 1000 / 1500 mm; custom lengths 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 User manual 01

Specifications

Technical Specifications

Parameter LIGO AIR (LxS, LxT) LIGO AIR PRO Unit
Standard length (L) 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 19.5 dBm
Advertising Protocol SOJI Protocol (default); Mielta Protocol or Escort Protocol (configurable via mobile app)
Power supply Li-SOCl₂ 3.6 V × 2600 mAh Li-SOCl₂ 3.6 V × 3600 mAh
Current consumption (working mode) 9 27 µA
Measurement interval 5 to 10 s
Advertising message interval 5 to 10 10 to 15 s
Ingress protection rating IP69K
Operating temperature −40 to +85 °C
Resolution 12 bit
Accelerometer Built-in
Memory Built-in 32 Mb EEPROM
Average sampling period 5 to 60 s
Temperature measurement absolute error ± 2 °C
Average service life (expected) 10 years
Storage condition 15 °C to 30 °C, RH < 60 %

Dimensions

See mechanical drawing:

LIGO AIR mechanical dimensions

Installation

Before installation: Read the Safety Information section in full.

Tools Required

  • Drill with Ø42 mm hole saw + Ø7 mm drill bit
  • Tube cutter or hacksaw + deburring tool
  • Screwdriver (for M4.8 self-drilling screws or M5 rivet nut tool)
  • Fuel-resistant RTV silicone gasket maker
  • Smartphone (iOS or Android) with LIGO BLE Configurator app installed
  • PPE: fuel-resistant gloves, safety glasses, ventilation

Step 1: Site / Fuel Tank Preparation

  1. Empty the tank, then clean and dry it. For gasoline tanks, purge all fuel vapors before drilling to prevent fire or explosion.
  2. Select the installation location:
    • As close as possible to the geometric center of the tank, at the deepest point.
    • Avoid contact with reinforcement ribs or any internal equipment.
    • Mounting orientation must allow the directional arrow on the sensor cover to point toward the receiving device (max signal transmission direction).
  3. Drill the central hole Ø42 mm, then drill four additional Ø7 mm holes for mounting screws.

Mounting hardware selection by tank wall thickness:

Wall Thickness Recommended Fastener Mounting Hole
≤ 3 mm M5 rivet nut 4 × Ø7 mm
> 3 mm M4.8 self-tapping screw 4 × Ø7 mm

Step 2: Sensor 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 and clean the tube using fuel.

⚠️ CAUTION — Minimum Tube Length

The tube length after cutting must be at least 150 mm (15 cm). Shorter tubes are not supported.

Install the bottom-stop, springs, and oil filter onto the tube in sequence.

Step 3: Mounting on the Fuel Tank

  1. Apply fuel-resistant RTV silicone gasket maker to the fuel tank surface, gasket, and sensor flange.
  2. Insert the LIGO AIR sensor into the tank.
  3. Fasten securely using the appropriate fasteners (self-tapping screws or rivet nut as per wall thickness above).
  4. Confirm the directional arrow on the cover points toward the receiving device.
File:LIGO-AIR-mounting.png
LIGO AIR mounting on fuel tank

Step 4: Verification

  • Confirm a minimum 150 mm clearance between the sensor top and any overhead metal surface.
  • Confirm no metal plate covers the sensor head.
  • Power-cycle/wake the sensor and proceed to Configuration.

Configuration

Mobile Application

Download LIGO BLE Configurator:

  • iOS — App Store
  • Android — Google Play
ℹ️ NOTICE — Permissions

For full operation, grant all permissions requested by the app (Bluetooth, location, storage).

Detailed app usage is documented in the LIGO BLE Configurator App User Guide.

Connecting Sensor

  1. Open the LIGO BLE Configurator app.
  2. The app scans for nearby LIGO AIR sensors.
  3. Select the target sensor from the discovered list to establish a Bluetooth connection.
  4. When prompted, enter the device password. Change the default password immediately after the first successful connection.

Calibration: Set Empty and Set Full

After mounting and pairing, calibrate the sensor before deployment:

Step 1 — Set Full:

  • Immerse the sensor in fuel until the fuel reaches the sensor flange.
  • Wait for the C_working value to stabilize.
  • Press Set Full.

Step 2 — Set Empty:

  • Remove the sensor from the fuel.
  • Wait 1–2 minutes to allow fuel to drain from the measuring probe.
  • Press Set Empty.

Configurable Parameters

Parameter Default Range / Options Description
Advertising Protocol SOJI Protocol SOJI / Mielta / Escort Output protocol for the advertising message.
Measurement interval — 5 – 10 s How often the sensor samples the fuel level.
Advertising interval — 5 – 10 s (AIR) / 10 – 15 s (PRO) How often advertising messages are broadcast.
Average sampling period — 5 – 60 s Averaging window for the reported value.
Password Manufacturer default User-defined Must be changed at first setup.

Operation

Reading Data

The sensor broadcasts level data over Bluetooth advertising. Data is received by a paired telematics tracker, gateway, or the LIGO BLE Configurator app, then forwarded to a telematics platform or fleet management server.

Calibration Methods

Method Description Recommended
Calibration on the Platform (server) Sensor sends raw level values (0–4095) to the server via the telematics device; the platform converts to volume (liters) using a calibration table. ✅ Recommended by manufacturer for LIGO AIR.
Calibration on the Sensor Sensor directly transmits volume values (liters) based on an internal calibration table.

Long-Range Operation

For long-distance transmission or environments with metal obstacles causing signal attenuation, choose LIGO AIR PRO (higher TX power) or add a LIGO AIR Adapter on the receiver side to boost signal reception.

Device Combination Bluetooth Signal Range
LIGO AIR + Telematics (tracker) device Standard distance
LIGO AIR + LIGO AIR Adapter 2 × Standard distance
LIGO AIR PRO + LIGO AIR Adapter 4 × Standard distance

Protective Accessories

Protective cap — install after the sensor is mounted and calibration is complete. The cap prevents unauthorized access and protects against UV, impact, and other environmental factors.

  • Install: push the cap down until it clicks into place, indicating it is fully seated.
  • Remove (for inspection): follow the removal procedure shown in the user manual to avoid damaging sensor parts.
⚠️ CAUTION — Cap Removal

Ensure no sensor parts are damaged while removing the protective cap.

Troubleshooting

Symptom Possible Cause Solution
Sensor not discovered by LIGO BLE Configurator app
  • Sensor outside Bluetooth range
  • Metal obstruction blocking sensor head
  • Sensor battery depleted (end of service life)
  • App permissions not granted
  • Move within range; verify line-of-sight
  • Remove any metal plate above sensor
  • Verify sensor age vs ~10-year service life
  • Re-grant Bluetooth & location permissions
RSSI at receiver below −80 dBm
  • Distance too far
  • Metal obstruction in signal path
  • Sensor orientation wrong (arrow not toward receiver)
  • Use LIGO AIR PRO or add LIGO AIR Adapter
  • Re-route or remove obstruction
  • Re-mount sensor so directional arrow points to receiver
Level reading unstable / not stabilizing during Set Full
  • Fuel level below sensor flange
  • Air bubbles in measuring tube
  • Tube not properly cleaned after cutting
  • Top up fuel until it reaches the flange
  • Wait longer (>2 min) for stabilization
  • Remove sensor, clean tube with fuel, re-install
Reading shows 0% after Set Empty when fuel is present
  • Set Empty / Set Full procedure executed in wrong order
  • Tube damaged or burrs not removed
  • Repeat calibration: Set Full first (immersed), then Set Empty (drained)
  • Inspect tube, deburr, re-cut if necessary
Cannot connect with default password (login refused)
  • Default password already changed by previous user
  • Contact the previous installer or factory-reset via support

If the problem persists, contact Support.

Maintenance

Periodic Inspection

Frequency Action
Monthly Visual inspection of sensor cover, cable entry, and protective cap for damage or tampering.
Quarterly Verify RSSI ≥ −80 dBm at receiver; check directional alignment.
Annually Verify calibration on the platform; confirm advertising protocol/interval settings.
~10 years (end of service life) Replace sensor — Li-SOCl₂ primary battery is non-replaceable; expected service life is 10 years.

Cleaning

  • Clean the external housing with a soft cloth and mild detergent.
  • For the measuring tube, clean with clean fuel.
  • Do NOT use solvents, abrasive materials, high-pressure water jets directed at the cover, or alcohol-based cleaners on the sealed electronics housing (IP69K rating preserved only when housing is intact).

Calibration Verification

After any maintenance that disturbs the sensor mounting or tube, re-run the Set Full / Set Empty procedure (see Configuration).

Battery Replacement

The Li-SOCl₂ battery is sealed inside the device and is not user-replaceable. When the sensor reaches end of service life (~10 years), replace the entire unit and recycle the old unit per local WEEE / battery regulations.

⚠️ WARNING — Battery Safety

Do not attempt to open the sensor housing or replace the internal battery. Li-SOCl₂ cells can leak, vent, or rupture if mishandled. Return spent units to SOJI Electronics or an authorised recycler.

Disposal / End-of-Life

  • Recycle per WEEE Directive (EU 2012/19/EU) and local equivalents.
  • Lithium battery — return to a certified battery recycling facility.
  • Do not incinerate or crush the unit.

Certification / Compliance

Mechanical

Standard Rating
IEC 60529 — Ingress Protection IP69K
Operating temperature range −40 °C to +85 °C

Wireless / Radio

Region / Standard Status
Bluetooth 5.4 (Bluetooth SIG) Compliant
IEEE 802.15.4-2006 (2.4 GHz) Compliant
CE RED Refer to Product Certification & Approvals
FCC Part 15 Refer to Product Certification & Approvals
ISED RSS (Canada) Refer to Product Certification & Approvals
UKCA Refer to Product Certification & Approvals

Environmental

Standard Status
RoHS 3 (EU 2015/863) Refer to Product Certification & Approvals
REACH Refer to Product Certification & Approvals
WEEE Refer to Product Certification & Approvals
Battery WEEE / Battery Directive Refer to Product Certification & Approvals

Bluetooth Qualification

Refer to Product Memberships for SIG Member ID, QDID, and EPDID details.

Warranty

Warranty period, exclusions, and void conditions are defined in the SOJI Electronics standard warranty terms. Contact Support for the current warranty document.

Support / Contact

Channel Detail
Website sojielectronics.com
Email support@sojielectronics.com
Phone (see official website for current support line)
Address SOJI Electronics Joint Stock Company — (see official website for current address)
Service hours Mon – Fri, 08:00 – 17:00 GMT+7

Cross-references to other documents.

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