We are an OEM supplier that specializes in custom development of precision fuel quantity level indication (FQI) modules for LNG fuel level monitoring using Capacitance Probes.
Our solutions are tailored specifically for applications such as commercial trucks, buses, locomotive, heavy-equipment and other commercial / industrial vehicles utilizing LNG as an alternative fuel to diesel.
Our FQI fuel-level module connects to the internal tank capacitance probe, and measures the fuel level via a coaxial cable. The fuel level data is translated to a compatible signal and displayed in the cab as fuel-level. The module operates on 9V-32V DC standard vehicle power systems.
TECHNOLOGY: Our FQI fuel-level modules utilize a RISC micro-controller and proprietary software and filtering algorithm to deliver precise LNG fuel-level monitoring. Designed to outperform traditional analog systems, our technology eliminates drift and errors, ensuring exceptional accuracy and stability. Calibration values are securely retained in memory—even in the event of power loss, guaranteeing consistent performance throughout the vehicle’s lifetime. Integrated multi-color LEDs provide intuitive visual indicators for setup, diagnostics, and operation, enhancing usability and reliability.
SIGNAL OPTIONS:
SSU-33/240-12: 33-ohm to 240-ohm output (direct-drive to fuel-gauge)
SSU-4/20-12: 4ma~20mA Current Output
SSU-0/5-12: 0~5V Analog Voltage Output / ECM or gauge.
SSU-12C: CAN communication (SAE J1939, standard PGN/SPN messaging, 29‑bit identifiers)
POWER: Vehicle wiring is standard for 12V or 24 VDC @ 5A, (20AWG typical) for power, signal & ground.
CALIBRATION: Calibration options include a non-intrusive manual process, or can be performed using our Level-DAQ calibration APP (included) on a standard laptop to set the EMPTY and FULL levels. No special calibration tools or extra modules are required. This eliminates the need to match the sending unit to specific cables or probes, reducing inventory costs and simplifying purchasing by providing a single module suitable for all vehicle applications.
SPECIFICATIONS:
- Environmental Rating: IP69, NEMA 4X
- ISO Compliance Rating: Designed to be compliant with ISO16750-2 / ISO11452-4 & ISO 7637-2-2011 standards
- Power Input: 9V~32VDC (+/- 20%)
- Supply Current: Under 25mA quiescent current power during operation
- Output Options: (specify output when ordering)
- Current sinking, Transistor drive (standard 33~240 ohm FUEL Gauge)
- 4mA~20mA current source
- 0~5VDC Analog Voltage Output
- SAE J1939 CAN 2-wire communication (single or dual-tank options)
- Temperature Range: Operational -40F to +176F (-40C to +80C)
- Capacitance Probe: Typical 100pF~1000pF, configurable to other ranges.
Note: This technology is adaptable to other low-dielectric cryogenic liquids as well as petroleum-based fluids such as diesel, alcohols, and aviation fuels. It supports a wide range of liquid level measurement applications across industrial, medical, and energy sectors.
We partner with teams of all sizes—OEMs, suppliers, and even small operations—to build solutions tailored to your needs. Most projects require no upfront NRE engineering costs, making it easy to get started. OEM, private‑label, and low‑volume programs are always welcome.
CONTACT US: To discuss your specific application.
Contact us to discuss your application!