LIGO AIR Datasheet

Product Overview

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.

The purpose of creating a new product was to satisfy the increasing demand of the transport telematics market for improved reliability of the design, data, and ease of installation. Unlike its predecessors, 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. This ensures that the LIGO AIR sensor maintains stability, durability, and operational lifespan equal to or even greater than that of wired sensors.

Key Features

• High accuracy up to 99,5%.
• By utilizing directional antenna technology, the sensor achieves a communication range up to 1.5 times greater than typical market-available sensors.
• With ultra-low power consumption (9uA in working mode and 4uA in storage mode), the sensor ensures longer battery life and reduced maintenance.
• Can be optionally cut off or prolonged up to 6000mm.
• Wide operating temperature ranges from -40°C to +85°C.
• TX power up to 19.5dBm (LIGO AIR PRO).
• Battery capacity up to 3600mAh (optional) helps to extend battery life of sensor.
• Replaceable battery.
• Built-in accelerometer.
• Built-in 32Mb EEPROM for data logs (Continuously stored for a minimum of 90 days) and setting logs (Maximum 500 logs).
• Built-in Anti-mud oil filter and anti-vibration springs.
• IP69K waterproof standard.
• 8-10 years of battery life.

Applications

• Trucks, excavators, heavy construction machines…
• Marine vessels and electric generators.
• Off-highway machinery including high-temperature & vibration environments.
• Industrial oil storage tanks or stationary storage tanks.

Product Variants / Ordering Information

During our discussions with customers and market research, we found that most wireless fuel level sensors on the market suffer from key issues such as poor durability, short battery life (2-4 years), and unstable connectivity (Bluetooth signal).

To address these challenges, the LIGO AIR series was developed — a new generation of wireless fuel level sensors engineered for superior reliability, long battery life, and stable long-range communication in all environments.

The LIGO AIR series offers three specialized versions, each optimized to meet specific operational demands — from cost efficiency to long-range communication and extended battery life as bellow:

• LIGO AIR LxS: The standard version of the LIGO AIR sensor is designed as a cost-effective solution that fulfills essential monitoring needs while maintaining reliable performance (Trucks, excavators, cement mixer truck, heavy construction machines…)
• LIGO AIR LxT: The extended-battery version of the LIGO AIR sensor is designed for applications that demand long operational life (8-12 years) and reliable performance in harsh environments, including high-temperature conditions.
• LIGO AIR PRO: The long-range version of the LIGO AIR sensor is 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…)

The following table summarizes the performance differences between LIGO AIR models and competitive products in terms of battery life and transmission distance:

Comparison product	Competitive products on the market	Standard version	Extended battery life	Extended transmission range
	Product	LIGO AIR LxS	LIGO AIR LxT	LIGO AIR Pro LxS
Battery life	0.4 x Standard (2-4 years)	Standard (6-8 years)	1.5x Standard (8-12 years)	Standard (6-8 years)
Transmission range	0.6 x Standard	Standard	Standard	2x standard

Technical Specifications

Parameter	LIGO AIR LxS	LIGO AIR 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	6 dBm	19.5 dBm
Advertising Protocol	- SOJI Protocol (default) - Mielta Protocol (setting in mobile app) - Escort Protocol (setting in mobile app) - Technoton Protocol (setting in mobile app) - Eurosen Protocol (setting in mobile app)
Power supply	3.6V * 2600mAh	3.6V * 2400mAh	3.6V * 3600mAh
Current consumption in working mode (uA)	9	9	27
Measurement interval (second)	From 5 to 10
Advertising message interval (second)	From 5 to 10	From 5 to 10	From 10 to 15
Waterproof standard (Ingress protection rating, IP)	IP69K
Operating temperature (°C)	-40...+85
Resolution (bit)	12
Accelerometer	N/A	Built-in	Built-in
Memory	Built-in 32Mb EEPROM
Average sampling period, s	5 to 60
Absolute error in temperature measurement within the entire temperature measuring range, °С	±2
Average service life, years (expected)	10 years

Dimensions

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Figure 1. LIGO AIR series' overall dimensions (mm).

Manufacturer part number	L (mm)
LIGO AIR – L7S LIGO AIR – L7T LIGO AIR PRO – L7S	700 ± 3
LIGO AIR – L10S LIGO AIR – L10T LIGO AIR PRO – L10S	1000 ± 3
LIGO AIR – L15S LIGO AIR – L15T LIGO AIR PRO – L15S	1500 ± 3

Compliance and Certifications

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

Warranty

• The warranty period is 3 years from the date of shipment by the manufacturer.
• The warranty period and service life do not apply to the battery.
• Compliance with the specified operating, transport, and storage conditions is a prerequisite for the manufacturer's guarantee.
• The manufacturer reserves the right to modify the design and composition of the product without prior notice to the customer.

Revision History

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