Resistance Slider

Pressure Level

Ultrasonic

Radar

Passive measurement of resistance as a magnetic ring slides up and down a hollow shaft with resistors embedded internally.

Active measurement of pressure in a tank using a silicon wafer that “bends” under pressure and creates a signal. Resultant signal may be voltage, NMEA, CAN or or Bluetooth data.  

Active measurement of distance from under a tank (or above tank for Some) to the air-water interface point. Resultant signal may be voltage, NMEA, CAN or or Bluetooth data.  

Active measurement of distance from top of tank to air-liquid interface point. Resultant signal may be voltage, NMEA, CAN or or Bluetooth data.  

Above Tank with height access to remove the unit of similar height of tank.

Side of tank as close to bottom as possible. Needs a threaded boss on tank to screw into.

Below tank must use a couplant of grease or glue. Cant have intermediate layer.

Above tank for non-metal tanks can sit directly on top of tank (glue) and for metal tanks, needs hole with SAE 5 bolt pattern.

20-30mm Accuracy

Varies with quality but typically 20mm

Varies with quality but generally average

High accuracy of 1mm is achievable.

No active power. Just 2 wire to resistance sensor.

3 wire of power and voltage value and ground.

3 wire of power and voltage value and ground or battery Bluetooth.

Battery operate Bluetooth or CAN/NMEA powered 12/24V.

N/A

N/a

3-5 years battery life

5 years Battery Life

Enhanced by AI

Stainless steel components

Stainless steel components

Plastic and embedded sensor

Billet machined Aluminium and embedded liquid proof radar sensor.

Not Suitable for Black water and troublesome in grey water measurement

Not Suitable for Black water and troublesome in grey water measurement

Not Suitable for Black water and troublesome in grey water measurement

Perfect for black water, grey water even with foam on top.