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Using a fuse coupled with one pole (-) or (+) is recommended for over-voltage protection purpose in case the car equipment is too old or the power cannot be guaranteed. It isadvisable to use fuses which have the rated current less than 2A.
Using a fuse coupled with one pole (-) or (+) is recommended for over-voltage protection purpose in case the car equipment is too old or the power cannot be guaranteed. It isadvisable to use fuses which have the rated current less than 2A.
==== 2. Configuration software interface ====
'''A. On mobile platform'''
Connecting the sensor to LIGO mobile configurator
<div style="text-align:center;">
[[File:LIGO-PRO-mobile-connect.png|frameless|600px]]
<div style="font-style:italic; color:#555;">Figure 9. Connecting the sensor to the LIGO mobile configurator</div>
</div>
Configuring and managing the appropriate settings for the LiGO device sensor is essential to ensure its proper, stable, and accurate operation. It also allows for continuous monitoring of the device's operational status, potential failures (whether caused by the sensor itself or external factors), and overall lifespan.
<div style="text-align:center;">
[[File:LIGO-PRO-mobile-ui.png|frameless|444px]]
<div style="font-style:italic; color:#555;">Figure 10. Device's management, setting up and configuration software interface</div>
</div>
'''B. On PC device'''
Connecting the sensor to LIGO configurator on the PC.
<div style="text-align:center;">
[[File:LIGO-PRO-pc-connect.png|frameless|847px]]
<div style="font-style:italic; color:#555;">Figure 11. Connection diagram of sensor to PC via a configuration tool</div>
</div>
In addition to the configuration options on mobile platforms, we also provide the capability to configure the sensor on personal computers (PCs), enabling remote support and more in-depth setup and configuration of the sensor.
<div style="text-align:center;">
[[File:LIGO-PRO-pc-ui.png|frameless|425px]]
<div style="font-style:italic; color:#555;">Figure 12. Device's management, setting up and configuration software interface on PC</div>
</div>
'''Main parameters:'''
# '''Sensor:'''
#: Restore password: Restore user password, user will receive an encrypted string which will be sent to SOJI for password decryption
#: Change password: Change user password
#: 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
#: Exit: Quit configuration interface
# '''Language:''' Choose English or Vietnamese interface
# '''Level Min:''' Configure LIGO PRO-AF output voltage or frequency range according to the voltage or frequency range of the tracking device input
# '''Level Max:''' Configure LIGO PRO-AF output voltage or frequency range according to the voltage or frequency range of the tracking device input
# '''Output type:''' Select analog or frequency output (used only for LIGO PRO-AF)
# '''Filter time:''' set output signal processing time. Default time 60 seconds.
# '''Automatic transmission mode:''' Automatic transmission mode applied only to RS232/RS485 defines sensor output message type:
#* Off – no automatic message transmission, sensor is waiting 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 that the sensor automatically sends output message to the tracking device. Parameter value range is from 1…60 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:''' Select output value type for sensor data
#: One of the following output value types available for LIGO PRO-RS232 and LIGO PRO-RS485
#* 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.
# '''COM Port:''' COM port number will be displayed on PC as well as baud rate for RS232 and RS485.
# '''Baud rate:''' Select the rate for data exchange with external device. Default value – 9600 bit/s.
# '''Output:'''
#: OSC frequency: Initial measuring generator frequency (Hz)
#: Data output: Data output (0-4095)
#: Sensor message: Sensor working message
{| class="wikitable"
|-
! Sensor message !! Transcript of the malfunction code !! Possible solution
|-
| style="text-align:center;" | 255 or 254 || Calibration error || Check if the measuring probe actual size value is inserted correctly and (or) re-calibrate the sensor
|-
| style="text-align:center;" | 253 || Short circuit in measuring probe tubes || Wash the measuring probe tubes with clean fuel, clean fuel tank of mud and water.
|-
| style="text-align:center;" | 252 || Calibration error || Check if the measuring probe actual size value is inserted correctly and (or) re-calibrate the sensor
|-
| style="text-align:center;" | 251 || Hardware failure || Contact supplier
|-
| style="text-align:center;" | 250 || Calibration error || Check if the measuring probe actual size value is inserted correctly and (or) re-calibrate the sensor
|}
* '''Sensor temperature:''' temperature inside sensor circuit board
* '''Sensor type:''' Sensor models RS232, RS485, AF
# '''Calibration Table:''' Calibration table
# '''History:''' Configuration history
# '''Enable AutoCalib feature:''' Automatically calibrate after cutting. User does not need to reconfigure after cutting.
# '''Infor device:'''
#: Firmware version: Sensor's firmware version
#: Device ID: Sensing chip's ID
#: HW version: Sensor's hardware version
#: Boot version: Sensor's bootloader version
==== 3. Connecting multiple sensors together ====
''(Only applicable to RS232 and RS485)''
In some situations, there are oil tanks with specific dimensions, interconnected oil tanks, or oil tanks that are either too long or too large. Using just one sensor to measure the accurate fuel level inside these oil tanks may not be feasible. Hence, there is a need to connect two or more sensors together through a data processor called SUM-DATA.
<div style="text-align:center;">
[[File:LIGO-PRO-multi-sensor-tank.png|frameless|728px]]
<div style="font-style:italic; color:#555;">Figure 13. Oil tank with particular dimensions connecting multiple sensors together</div>
</div>
Connection diagram of the processor SUM-DATA for multiple sensors:
<div style="text-align:center;">
[[File:LIGO-PRO-sumdata-2sensors.png|frameless|648px]]
<div style="font-style:italic; color:#555;">Figure 14: Connecting two sensors by 01 processor SUM-DATA</div>
</div>
<div style="text-align:center;">
[[File:LIGO-PRO-sumdata-multi.png|frameless|707px]]
<div style="font-style:italic; color:#555;">Figure 15: Connecting multiple sensors together by multiple processors SUM-DATA</div>
</div>


=== Installation ===
=== Installation ===

Revision as of 02:24, 24 June 2026

Product Overview

The LIGO PRO fuel level sensor represents a significant advancement as a third-generation product, having undergone extensive mechanical refinements to enhance both performance and durability. These improvements enable the sensor to better cope with issues such as water resistance and electrical insulation, especially compared to its predecessors. Notably, this product adheres to the highest standards of water and chemical resistance, including its ability to withstand water ingress according to the IP69K standard.

Another key feature is the sensor's base, constructed from synthetic plastic, which has been cleverly designed to flex and conform seamlessly to the curved surfaces of fuel tanks without the need for multiple rubber gaskets to prevent oil spillage.

Furthermore, the product is manufactured with high-quality materials, ensuring reliability in extreme temperature environments. It effectively withstands the impacts of chemicals, gasoline, and UV radiation without succumbing to any form of degradation or corrosion. This makes the sensor an ideal choice for applications in harsh temperature conditions and those requiring exceptional durability.

Key Features

  • High accuracy up to 99.5%.
  • Operating input voltage range from 7V-50V
  • Internal isolation voltage up to 2500V.
  • Possibility of cutting down or extending up to 6000mm (optional)
  • Wide operating temperature range from -40°C to +85°C.
  • A filter protecting the probe from dregs and water.
  • Ingress protection rating IP69K
  • Noise filter and temperature compensation system.
  • Installation and configuration software on multiple application devices: phone, laptop, etc.
  • Anti-vibration spring when moving.
  • Quick installation, safety guaranty.

Applications

  • Trucks, container cars, excavators, trains…
  • Boats, barges.
  • Electric generators.
  • Industrial oil storage tanks and stationary storage tanks.
  • Factories, industrial zones.
  • Fuel storage tanks in agricultural machines and maritime transportation…

Product Variants / Ordering Information

LIGO PRO Order Code

Code Description
AF Analog (0…9VDC)
Frequency 500…2000Hz
RS232 RS232
RS485 RS485
Code Description
L7 700mm
L10 1000mm
L15 1500mm
Other length Contact manufacturer

For Example: 700mm length, output signal AF sensor has the order code: LIGO PRO - AFL7

Products and Accessories

No. Description Qty (pcs)
1 LIGO PRO Fuel Level Sensor. Standard lengths: 700, 1000, 1500mm (for other customized lengths, please contact the manufacturer) 01
2 Oil filter 01
3 Gasoline resistant rubber gasket 01
4 Anti-vibration spring when moving 01
5 2A Fuse protection 01
6 Self-drilling screw M4.8x32mm 04
7 Rivet and screw M5x20mm 04
8 Sealing cord 01
9 Plastic wire sealing connector 01
10 7m PVC coated signal wire 01
11 Quick installation manual 01

Technical Specifications

Technical specifications of the LIGO PRO product

Parameter AF RS232 RS485
Standard length (L), mm 700, 1000, 1500...up to 6000 mm
Measuring error, % ± 0.5 %
Output signal Analog (0…9V), Frequency (500- 2000Hz) RS232 RS485
Baud rate, bit/sec 9600 2400, 4800, 9600, 19200, 38400, 57600, 115200.
Power supply (DC input voltage, V) 7…50
Maximum power consumption, mA 20
Dielectric strength of galvanic isolation, min (V) 2500
Ingress protection rating 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 (0...8); Frequency (500...1500 Hz) 0 0
Digital reading range corresponding to the maximum level measurement value Analog (1...9V); Frequency (1000...2000 Hz) 4095 4095
Average sampling period, (s) 0...255
Message interval, (s) Continuous 1...60 1...60
Absolute error in temperature measurement within the entire temperature measuring range, °С ±2
Average service life, years (minimum) 10

Technical Characteristics

1. Voltage output signal depending on the probe length

Figure 1. Dependence of the voltage output signal on the fuel level

Operating voltage range from (0…9V).

2. Frequency output signal depending on the probe length

Figure 2. Dependence of the frequency output signal on the probe length

Operating frequency range from (500-2000Hz).

3. RS232/RS485 output signal depending on the probe length

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Figure 3. Dependence of the RS232/RS485 output signal on the probe length

Measurement range from (0-4095)

Overall Dimensions and Detailed Descriptions

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Figure 4. Overall dimensions of LIGO PRO fuel level sensor

Description:

No Content
1 Oil filter
2 Sensing probe
3 Gasoline resistant rubber gasket
4 Sensor's head containing sensing circuit board
5 Twisted steel stainless steel plastic conduit
6 Connector IP67
7 Anti-vibration spring
8 Self-drilling M4.8x32mm x 4pcs or M5x20 Rivet nut x4pcs

Connector

Pins

PIN DESCRIPTION
1 GND
2 NC (Not connected)
3 7…50 VDC
4 TXD/B-
5 Analog or Frequency
6 RXD/ A+

1. Connecting LIGO PRO to an external device

+ RS232/ RS485

Wire Colour Description
Black GND (Ground) (V-)
Yellow RXD/A+
Blue TXD/B-
Red 7…50VDC

Figure 7. Wiring diagram of RS232 and RS485 output signals

+ AF (Analog & Frequency)

Wire Colour Description
Black GND (Ground) (V-)
Yellow Out (Analog/Frequency)
Red 7…50VDC

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Figure 8. Wiring diagram of Analog and Frequency output signals

LIGO fuel sensor is protected against reverse-polarity and overvoltage. This feature helps to protect circuit boards against incorrect connections and it can withstand a continuous over-voltage condition (up to 50V in LIGO-SP product and 100V in LIGO-SP-PRO product) and short-circuit. Please avoid connecting sensor to a power supply which is unstable, usually fluctuates, or has a voltage higher than the recommended voltage range above.

Using a fuse coupled with one pole (-) or (+) is recommended for over-voltage protection purpose in case the car equipment is too old or the power cannot be guaranteed. It isadvisable to use fuses which have the rated current less than 2A.

Installation

Quick installation through 5 steps:

  1. Step 1: Pierce oil tank
  2. Step 2: Based on oil tank's height, cut a suitable level indicator
  3. Step 3: Configure new length
  4. Step 4: Install the level indicator in the oil tank
  5. Step 5: Re-adjust the sensor according to the volume of the oil tank

For further information about the sensor's installation procedure and configurator software, please visit our website www.sojielectronics.com or contact us for more details.

Compliance and Certifications

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

Cross-references to other documents.

Revision History

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