calf-803 liquid level measurement 4–20ma modbus protocol rs485 output capacitive level sensor for water truck fuel tanks

CALF-803 Capacitive Level Sensor Application Case: Fuel Tanker Truck Level Monitoring

Client Profile

A regional logistics company in Southeast Asia operating a fleet of 50+ diesel tanker trucks required a reliable real-time fuel monitoring solution to combat fuel theft and optimize refueling schedules across long-haul delivery routes.

Challenge

The fleet relied on manual dipstick measurements, which were time-consuming, inaccurate, and vulnerable to tampering. The company experienced an estimated 8–12% fuel loss annually due to unauthorized siphoning and measurement errors. Additionally, drivers had no real-time visibility into remaining fuel levels during extended trips, leading to unplanned refueling stops and delayed deliveries.

Solution

The CALF-803 input probe capacitive level sensor was installed directly into each truck's diesel tank via standard top-flange mounting. Connected to an onboard GPS telemetry unit through the sensor's RS485 Modbus output, fuel level data was transmitted in real time to the fleet management center. The rugged stainless steel probe and insulation ensured stable performance despite constant road vibration, temperature fluctuations, and exposure to diesel's corrosive properties.

 Results

Within three months of deployment, fuel loss decreased by over 70%, and unplanned refueling incidents dropped significantly. Fleet managers gained full transparency into fuel consumption patterns, enabling data-driven route planning and procurement forecasting. The maintenance team reported zero sensor failures, validating the CALF-803's durability in heavy-duty mobile applications.