LIGO PRO BLE User Guide

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

10 main items with specific quantities are described below:

No.	Description	Qty (pcs)
1	LIGO Fuel Level Sensor. Standard lengths: 700, 1000, and 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	1A Fuse protection	01
6	Self-drilling screw M4.8x32mm	04
7	Rivet and screw M5x20mm	04
8	Sealing wire	02
9	7m signal wire	01
10	Quick installation manual	01

Specifications

Parameter	AF	RS232	RS485
Standard length (L), mm	700, 1000, 1500...up to 6000 mm
Measuring error, %	± 0.5 %
Output signal	Analog (0-9V)	RS232	RS485
Baud rate, bit/sec	2400, 4800, 9600, 19200, 38400, 57600, 115200.
Power supply (DC input voltage, V)	6-40V
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 (0...8V)	0	0
Digital reading range corresponding to the maximum level measurement value	Analog (1...9V)	4095	4095
Average sampling period, s	0...255
Message interval, s	Continuous	1...255	1...255
Absolute error in temperature measurement within the entire temperature measuring range, °С	±1
Bluetooth specs	Bluetooth 5.1, IEEE 802.15.4-2006, 2.4 GHz, -95 dBm sensitivity, +8 dBm TX Power
Average service life, years (expected)	10	10	10

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.

Figure 1. Selecting the location to install sensor

• When being installed, the sensor should not be in contact with reinforcement ribs inside the tank

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

Figure 3. Drilling the selected hole

• Drill out four mounting holes according to the diagram:

Figure 4. Drill out four mounting holes

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)

Figure 5. Hole thick

• ø 7 mm – for plastic and metal tank with wall thickness up to 3 mm (for rivets)

Figure 6. Rivet nut M5

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

Measuaring the tank depth and cutting sensor'measuring probe

Figure 8. Measuring the tank depth

• 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

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.

Figure 10. Installing screen filter procedue

Installing and connecting

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

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)

Figure 12. Put sensor into the tank

• Connect the sensors to an external device using 7m cable

The wire cable color:

RS232/RS485:

Figure 13. Wiring diagram of RS232 and RS485 output signals

Wire Color	Description
Black	GND (Ground) (V-)
Blue	TXD/B-
Yellow	RXD/A+
Red	6 - 40 VDC

AF:

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.

Figure 15. Sealing

Configuration

Connecting sensor to smartphone and setting

To configure the LIGO AIR fuel sensor, download the LIGO BLE Configurator app on Appstore (for IOS) or CH Play (for Android devices).

Hereinafter LIGO BLE Configurator is referred to as the "application" or "app".

Note: For full operation, you must grant all the permissions requested by the app

• 
  Figure 16. Grant all the permissions request by program
• 
  Figure 17. Grant all the permissions request by program

Grant all the permissions request by program as above

Connecting sensor

Run the application and select the sensor you want to connect to, as shown in the pictures below:

• 
  Figure 18. Selecting sensor type
• 
  Figure 19. Connecting sensor

Set Empty and Set Full

Step 1: Set Full

• Immerse the sensor in fuel until the fuel reaches the sensor flange
• Wait for C_working value to stablize and then press Set Full button

Figure 20. Set Full

Step 2: Set Empty

• Remove the sensor from the fuel and wait for 1-2 minutes allow the fuel drain from the measuring probe and then press Set Empty button.

Figure 21. Set Empty

Calibration table

After installation, the sensor must be calibrated to ensure accurate volume measurement. Calibration table can be performed either on the platform (server) or locally on the sensor.

• Calibration table on the Platform (Server): The sensor sends raw level values (ranging from 0 to 4095) to the server via the telematic device. The platform uses a calibration table to convert these values into volume (liters).
• Calibration table on the Sensor: The sensor directly sends volume values (liters) based on the internal calibration table.

Note: For LIGO AIR sensors, the manufacturer recommends performing calibration table on the platform.

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

Revision History

Loading revision history...