How a Submersible Level Transmitter Works
Send the liquid, tank or well depth and cable length — we confirm the range and quote samples.
How does a submersible level transmitter measure level? This one-minute animation shows the hydrostatic principle — pressure equals density × gravity × height — why the vent tube cancels atmospheric pressure, and how a 0–10 m range maps to 4–20 mA.
Chapters
Key points
- The transmitter sits at the bottom of the tank; the higher the liquid, the higher the pressure on the sensor.
- Pressure = density × gravity × height, so height = pressure ÷ (density × gravity); for water, 1 m gives about 0.1 bar.
- A vent tube in the cable connects the sensor to the atmosphere, so changes in air pressure cancel out.
- On a 0–10 m range, 4 mA is empty, 12 mA is 5 m and 20 mA is full.
- SEGMENsensor submersible level transmitters: 0.5–200 m water column.
Transcript
How does a submersible level transmitter measure level?
The transmitter sits at the bottom of the tank. The higher the liquid, the higher the pressure on the sensor.
Pressure = density × gravity × height, so height is pressure divided by density and gravity. For water, 1 m gives about 0.1 bar.
A small vent tube in the cable connects the sensor to the atmosphere, so changes in air pressure cancel out.
The output is 4–20 mA. On a 0–10 m range, 4 mA is empty, 12 mA is 5 m, and 20 mA is full.
SEGMENsensor submersible level transmitters: 0.5–200 m water column. Try our level calculator at segmensensor.com.