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Notes: Minimum allowable length of the measuring probe is 150 mm.
Notes: Minimum allowable length of the measuring probe is 150 mm.
==== Installing screen filter ====
Screen filter is mounted on the measuring probe of sensor to protect measuring probe electrodes from mud and water. Using the filter extends significantly faultless lifetime of the sensor.
Screen filter mounting order: firstly put on fixator, then put on bottom stop and fix it with two side screws. Put the screen filter over bottom stop and fasten it with a fixator locks.
<div style="text-align:center;">
[[File:LIGO-SP-fig15-screen-filter.png|frameless|747px]]
<div style="font-style:italic; color:#555;">Figure 10. Installing screen filter procedue</div>
</div>
==== Installing and connecting ====
* Applying oil-and-petrol resistant non-conductive sealant to ruber gasket
<div style="text-align:center;">
[[File:LIGO-SP-fig16-sealant.png|frameless|595px]]
<div style="font-style:italic; color:#555;">Figure 11. Applying the sealant to gasket</div>
</div>
* Put the sensor into the tank and fix: when fixing with rivets, use a rivet driver when bolting, put on a seal (per bolt), a spacer and a spring washer when fixing to plastic tanks with wall thickness over 3 mm, use vendor furnished self-tapping screws and a seal (per self-tapping screw)
<div style="text-align:center;">
[[File:LIGO-SP-fig17-install.png|frameless|663px]]
<div style="font-style:italic; color:#555;">Figure 12. Put sensor into the tank</div>
</div>
* Connect the sensors to an external device using 7m cable
The wire cable color:
'''RS232/RS485:'''
<div style="text-align:center;">
[[File:LIGO-SP-fig18-wiring-RS232-RS485.png|frameless|801px]]
<div style="font-style:italic; color:#555;">Figure 13. Wiring diagram of RS232 and RS485 output signals</div>
</div>
{| class="wikitable" style="text-align:center;"
! Wire Color !! Description
|-
| <div style="display:flex;align-items:center;justify-content:center;gap:8px;"><span style="display:inline-block;width:32px;height:14px;background:#000;"></span><span style="min-width:60px;text-align:left;font-weight:bold;">Black</span></div> || style="text-align:left;" | GND (Ground) (V-)
|-
| <div style="display:flex;align-items:center;justify-content:center;gap:8px;"><span style="display:inline-block;width:32px;height:14px;background:#f4d03f;"></span><span style="min-width:60px;text-align:left;font-weight:bold;">Yellow</span></div> || style="text-align:left;" | RXD/B-
|-
| <div style="display:flex;align-items:center;justify-content:center;gap:8px;"><span style="display:inline-block;width:32px;height:14px;background:#3b8dd9;"></span><span style="min-width:60px;text-align:left;font-weight:bold;">Blue</span></div> || style="text-align:left;" | TXD/A+
|-
| <div style="display:flex;align-items:center;justify-content:center;gap:8px;"><span style="display:inline-block;width:32px;height:14px;background:#d63a3a;"></span><span style="min-width:60px;text-align:left;font-weight:bold;">Red</span></div> || style="text-align:left;" | 12-37 VDC or 7.5-75V for SP PRO series
|}
'''AF:'''
<div style="text-align:center;">
[[File:LIGO-SP-fig19-wiring-AF.png|frameless|873px]]
<div style="font-style:italic; color:#555;">Figure 14. Wiring diagram of Analog and Frequency output signals.</div>
</div>
{| class="wikitable" style="text-align:center;"
! Wire Color !! Description
|-
| <div style="display:flex;align-items:center;justify-content:center;gap:8px;"><span style="display:inline-block;width:32px;height:14px;background:#000;"></span><span style="min-width:60px;text-align:left;font-weight:bold;">Black</span></div> || style="text-align:left;" | GND (Ground) (V-)
|-
| <div style="display:flex;align-items:center;justify-content:center;gap:8px;"><span style="display:inline-block;width:32px;height:14px;background:#f4d03f;"></span><span style="min-width:60px;text-align:left;font-weight:bold;">Yellow</span></div> || style="text-align:left;" | Out (Analog/Frequency)
|-
| <div style="display:flex;align-items:center;justify-content:center;gap:8px;"><span style="display:inline-block;width:32px;height:14px;background:#d63a3a;"></span><span style="min-width:60px;text-align:left;font-weight:bold;">Red</span></div> || style="text-align:left;" | 15-37 VDC or 7.5-75V for SP PRO series
|}
* Connect the fuse holder to LIGO sensor power cable (brown wire) in close vicinity to the vehicle power supply circuit
* Installing the fuse in the fuse holder
==== Sealing ====
* Install the bolt through a hole in the seal.
<div style="text-align:center;">
[[File:LIGO-SP-fig22-sealing.png|frameless|891px]]
<div style="font-style:italic; color:#555;">Figure 15. Sealing</div>
</div>


== Configuration ==
== Configuration ==

Revision as of 08:04, 22 June 2026

Safety Information

ℹ️ NOTICE — Installer Qualifications and Safety
  • LIGO PRO BLE measures the accurate fuel level in fuel tanks, therefore the device installation process also needs to be extremely accurate.
  • Installation technicians should be well-trained by specialists or experts in this field before installing the device.
  • Implement protection against electric shocks and electrical fires, labour safety and hygiene.
  • List of installing tools is provided in section APPENDIX A below.
  • List of accessories is provided in section APPENDIX B below.

Product Overview

LIGO PRO BLE sensor is produced and developed by SOJI Electronics Join Stock Company. The device is designed to measure the level of liquid fuels and other non-conductive liquids in vehicle's tanks and stationary fuel storages, applicable in different fields. The measured values will be t transformed into output signal in the form of: Analog, Frequency, RS232, RS485… and transmitted to a connected external device

Under particular conditions, the device can reach a high accuracy up to 99.5%. At present, on the market there are several lines of sensor using different technologies to measure fuel level such as: magnetically operated switches (reed switches), ultrasound wave (ultrasonic sensor), capacitive sensing (capacitive sensor). Among these ones, capacitive sensing technology is considered to have highest accuracy and greatest lifespan.

Package Contents

Sensor LIGO PRO BLE and all the accessories

STT Description Qty
1 LIGO PRO BLE sensor. Standard lengths: 700, 1000, 1500mm (for other customized lengths, please contact the manufacturer) 01
2 7m cable 01
3 Gasoline resistant rubber gasket 01
4 Oil filter 01
5 Anti-vibration spring 01
6 Fuse 1A 01
7 Sealing cord 02
8 Rivet and screw M5x20mm 04
9 Self-drilling screw M4.8x32mm 04

Specifications

Technical specifications of the LIGO PRO BLE product

Parameter AF RS232 RS485
Standard length (L),mm 700, 1000, 1500...up to 6000 mm
Measuring error, % ± 0.5 %
Output signal Analog (1…9V). RS232 RS485
Baud rate, bit/sec 2400, 4800, 9600, 19200, 38400, 57600, 115200.
Power supply (DC input voltage, V) 6-40
Supply protection (Over-voltage 100 VDC for 2 minutes. Reverse polarity) Yes
Maximum power consumption, mA 20
Waterproof standard (Ingress protection rating, IP) IP69K
Operating temperature, °C -40...+85
Maximum allowed humidity level,% 100
Resolution, bit 12
Digital reading range corresponding to the minimum level measurement value Analog (1...8V) 0 0
Digital reading range corresponding to the maximum level measurement value Analog (2...9V) 4095 4095
Average sampling period, (s) 0...255
Message interval, (s) Continuous 1...255
Absolute error in temperature measurement within the entire temperature measuring range, °С ±1
Average service life, (years)) 10
Bluetooth specs Bluetooth 5.1, IEEE 802.15.4-2006, 2.4 GHz, -95 dBm sensitivity, +8 dBm TX Power

Installation

Apendix A

List of equipment for fuel level sensors installation

STT Descriptions Qty
1 Bimetal core drill ø38 mm 1
2 Core drill shank 1
3 Metal drill ø7 mm & ø4 mm 1
4 Hacksaw 1
5 T Spanner 8mm Single Sided 1
6 Tap M5 with holder 1
7 Snap-seal for bolt/self-tapping screw 1
8 Mobile phone 1
9 DC power supply unit 12V-24V or battery 12V 1
10 Measuring container 1
11 Fuel 1
12 Gauging container 1
20 Tape mesaure 1

Installation

Selecting the location to install sensor

  • Installation location should be as close as possible to the geometric center and placed at the deepest level of the tank.

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Figure 1. Selecting the location to install sensor
  • When being installed, the sensor should not be in contact with reinforcement ribs inside the tank

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Figure 2. Installation of two sensors in one tank allows for significant reduction

Drilling the hole on fuel tank

  • Drill out the central bore by bimetal core drill ø38 mm
  • Drill out four mounting holes according to the diagram:

The mounting hole diameter depends on the tank material:

  • ø 4 mm – for metal tank with wall thickness over 3 mm (cut M5 self screw M4.8)
  • ø 7 mm – for plastic and metal tank with wall thickness up to 3 mm (for rivets)

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Figure 7. Installing revit nut if tank's wall is thinner than 3mm

Measuaring the tank depth and cutting sensor'measuring probe

  • Cut the sensor's measuring probe so that its length is 25 mm less than the depth of the tank. Ensure that shearing line is perpendicular to the sensor longitudinal axis

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Figure 9. Origin length (L) and length after cutting (Lm)

Notes: Minimum allowable length of the measuring probe is 150 mm.

Installing screen filter

Screen filter is mounted on the measuring probe of sensor to protect measuring probe electrodes from mud and water. Using the filter extends significantly faultless lifetime of the sensor.

Screen filter mounting order: firstly put on fixator, then put on bottom stop and fix it with two side screws. Put the screen filter over bottom stop and fasten it with a fixator locks.

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Figure 10. Installing screen filter procedue

Installing and connecting

  • Applying oil-and-petrol resistant non-conductive sealant to ruber gasket

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Figure 11. Applying the sealant to gasket
  • Put the sensor into the tank and fix: when fixing with rivets, use a rivet driver when bolting, put on a seal (per bolt), a spacer and a spring washer when fixing to plastic tanks with wall thickness over 3 mm, use vendor furnished self-tapping screws and a seal (per self-tapping screw)
  • Connect the sensors to an external device using 7m cable

The wire cable color:

RS232/RS485:

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Figure 13. Wiring diagram of RS232 and RS485 output signals
Wire Color Description
Black
 GND (Ground) (V-)
Yellow
 RXD/B-
Blue
 TXD/A+
Red
 12-37 VDC or 7.5-75V for SP PRO series

AF:

Error creating thumbnail: Unable to save thumbnail to destination

Figure 14. Wiring diagram of Analog and Frequency output signals.
Wire Color Description
Black
 GND (Ground) (V-)
Yellow
 Out (Analog/Frequency)
Red
 15-37 VDC or 7.5-75V for SP PRO series


  • Connect the fuse holder to LIGO sensor power cable (brown wire) in close vicinity to the vehicle power supply circuit
  • Installing the fuse in the fuse holder

Sealing

  • Install the bolt through a hole in the seal.

Configuration

Installing software and connecting configuration tool

Preparation:

  • Mobile phone
  • Power supply 12 -24VDC or battery 12V
Figure 10. Connecting USB to RS232 cable and configuration tool to laptop or PC

Download and install software. Downloading and installing softwares

Installing USB to RS232 driver

  • Installing driver for USB to RS232 cable
  • After finishing right click and check to ensure the driver is installed successful "Computer" >> "Manager" >> "Device Manager" >> "Port (COM & LPT)" as follow the picture bellow, otherwise, please check the cable and cable driver.
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Figure 11. Installing USB to RS232 driver successful

Installing sensor software configuration

Figure 12. Sensor configuration tool

Parameters descriptions:

Load config: Load configurations from sensor to PC. Note: user must load configurations from sensor before changing configurations on PC.

Save config: Save configurations from PC to sensor

Update firmware: Upgrade new firmware for sensor (visit www.sojielectronics.com for the latest firmware version)

Set full: Set Full for maximum fuel level calibration

Set Empty: Set Empty for minimum fuel level calibration

Level Min: Configure LIGO PRO BLE-AF output voltage or frequency range according to the voltage or frequency range of the tracking device input.

Level Max: Configure LIGO PRO BLE-AF output voltage or frequency range according to the voltage or frequency range of the tracking device input

Output type: Selecting voltage or frequency output (used only for AF sensor)

Filter time: Setting output signal processing time (0-255). Default is 60 seconds.

Automatic transmission mode: Automatic transmission mode applied only for RS232/RS485 defines sensor output message type:

  • Off – no automatic message transmission, sensor waits for tracking device request;
  • HEX - automatic message transmission in binary format (used by default);
  • ASCII - automatic message transmission in text format;
  • ASCII EXT – automatic message transmission in extended text format. Additional Prefix and Postfix configurable parameters are available for this mode to insert required header or ending of the message.

Message interval: Time period the sensor automatically send output message to the tracking device. Parameter value range is 1…255 seconds with 1 second step. Default value is 1 second.

Actual length: The actual length of sensor probe

Address (0-254): Set the network address for the sensor. When several sensors are connected to one external device, they should have a unique network address.

Parameter selection: Selection of output value type for sensor data

One of the following output value types available for RS232 and RS485 sensor

  • Fuel level in standard (normalized) units (0...1000).
  • Fuel level in millimeters (mm), 0.1 mm step.
  • Fuel volume in liters (L), 0.1 L step.
  • Fuel volume in percentage (%), 0.4% step.

Output:

OSC frequency: Initial measuring generator frequency (Hz)

Data output: Data output (0-4095)

Sensor message: Sensor working message if sensor message is none sensor works fine, otherwise malfunction codes are displayed as table:

Sensor message Transcript of the malfunction Code Possible solution
255 or 254 Calibration error Check if the measuring probe actual size value is inserted correctly and (or) re-calibrate the sensor
253 Short circuit in measuring probe tubes Wash the measuring probe tubes with clean fuel, clean fuel tank of mud and water.
252 Calibration error Check if the measuring probe actual size value is inserted correctly and (or) re-calibrate the sensor
251 Hardware failure Contact supplier
250 Calibration error Check if the measuring probe actual size value is inserted correctly and (or) re-calibrate the sensor.

Calibration Table: This entry is used to record fuel tank calibration into the sensor internal memory. The table is filled out with the data achieved during fuel tank calibration procedure. The data is entered as a table of correspondence between measured fuel level value (Fuel level (uint) field) and fuel volume in the tank (Volume (L) field). Recommended number of table entries is 15. Max possible is 30 entries.

Enable AutoClib feature: Sensor automatically calibrates Min, Max levels after cutting. User does not need to reconfigure after cutting.

Min/Max Calibration

a) Set Empty level

  • Keeping sensor apart from fuel and set Empty level
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Figure 13. Setting Empty level.

b) Set Full level

  • Fill the measuring container with fuel.
  • Immerse the sensor in the fuel to the full length of the measuring probe and set Full level
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Figure 14. Setting Full level

c) Installing screen filter

Screen filter is mounted on the measuring probe of sensor to protect measuring probe electrodes from mud and water. Using the filter extends significantly faultless lifetime of the sensor.

Screen filter mounting order: firstly put on fixator, then put on bottom stop and fix it with two side screws. Put the screen filter over bottom stop and fasten it with a fixator locks.

Figure 15. Installing screen filter procedue

d) Installing and connecting

  • Applying oil-and-petrol resistant non-conductive sealant to ruber gasket
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Figure 16. Applying the sealant to gasket
  • Put the sensor into the tank and fix: when fixing with rivets, use a rivet driver when bolting, put on a seal (per bolt), a spacer and a spring washer when fixing to plastic tanks with wall thickness over 3 mm, use vendor furnished self-tapping screws and a seal (per self-tapping screw)
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Figure 17. Put sensor into the tank
  • Connect the sensors to an external device using 7m cable

The wire cable color:

RS232/RS485:

Figure 18. Wiring diagram of RS232 and RS485 output signals
Wire Color Description
Black
 GND (Ground) (V-)
Yellow
 RXD/A+
Blue
 TXD/B-
Red
 6-40V


AF:

Figure 19. Wiring diagram of Analog and Frequency output signals.
Wire Color Description
Black
 GND (Ground) (V-)
Yellow
 Out (Analog/Frequency)
Red
 15-37 VDC or 7.5-75V for SP PRO series
  • Connect the fuse holder to LIGO sensor power cable (brown wire) in close vicinity to the vehicle power supply circuit
  • Installing the fuse in the fuse holder

e) Calibration

  • Launch Sensor >> load Config >> From Sensor >> Calibration Table
Figure 20. Calibration table
  • Pump fuel in the tank, the amount of pumped fuel depends on the tank's volume (at least 20 times of pumping)
  • After pumping, wait for a while (about 2 minutes) for the output data to be stable, then select "add a row" and insert the actual pumped liters in "liter" box, input the data given by sensor into "Data" box. User can click on the button to sync up data, or read data in the "output" tab as the image below.
  • Repeat the above steps until the oil tank is full (Attention: It is recommended to write down the information on the paper to compare with input data and avoid mistaking during the process)
  • After completing the above process, select "Volume (liter) as the output data.
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Figure 21. Parameter selection
  • Finally, click on the "Sensor" button at the top left corner -> Save config -> To sensor to save data for the sensor.

Attention:

  • The time between each pumping must be at least 2 minutes apart or wait for measured values to be stable, then comes the next pumping.

f) Sealing

  • Install the bolt through a hole in the seal.
Figure 22. Sealing

Quick installation without PC

This method is only applicable to configure Min and Max level.

Preparation before setting up

  • The sensor's auto-recognisation mode needs to be turned on by checking the "Enable AutoCalib Feature" box.
Figure 24. Turning on the auto-recognisation mode before installing
  • External devices such as GPS tracking or Dataloger… must have the software integrated with the configurator. The configuration is performed directly on the device.

Operation

Troubleshooting

Maintenance

Attention!

  • The manufacturer is not responsible for product availability in case of non-compliance of requirements of this service manual, unauthorized service and repair; if device has damage or traces of opening of head's body, mechanical damage of the probe or the interface cable, as well as traces of corrosive acids, open flame, high voltage, lightning strikes or other natural factors.

Certification / Compliance

Refer to LIGO PRO BLE Certification & Approvals for current certificate status.

Support / Contact

Channel Detail
Company SOJI ELECTRONICS.,JSC
Address C50-LK13, Lot No. 09, New Urban Area, Le Trong Tan street, Duong Noi Ward, Ha Dong District, Hanoi City, Vietnam
Tel/Fax +84 24 62 932 369
Email contact@sojielectronics.com
Website sojielectronics.com

Cross-references to other documents.

Revision History

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