Application Notes

EAP-032088

Monitoring Tank Water Level

I use an output signal (1-5 Vdc) from a water level indicator and watch water level of a tank. I use a pump and pull out water of a tank, but the tank suffers from minus number pressure when I operate the pump. It is about 0.3 V fall of output signal,1-5 Vdc. This minus number pressure troubles us to do a precise measuring of tank level. Could you suggest how to bias the output signal of 0.3 V when the pump works?

We recommend you to use the Programmed Ramp Generator, MXMS.
Please connect the MXMS outputting 3 mA to the 1-5 Vdc signal line in series.

Then attach a 100 ohm resistor and a relay between the MXMS’s + (plus) and – (minus) terminals and then program the relay routine as OFF at pump works and as ON at pump stops. You can get a bias of 0.3 V (3 mA x 100 ohms) when the pump works.