The PC-200-LLC-GM
is a liquid level control relay used to control conductive liquid pumping operations in a pump-up or pump-down application. The unit comes in
two different voltage ranges (see specs below).  The unit has an adjustable sensitivity knob (4.7k to 100k ohms) that is set according to the
resistance level at which you want the probes (sold separately) to sense the conductive liquid. The unit has a built-in debounce time delay that prevents the relay from energizing if the probe resistance
momentarily goes above or below the sensitivity setpoint (due to liquid splashing in the tank).  The unit operates its internal relay based on
inputs from a high and low probe and a common reference (when a conductive tank is used) or common probe (when a non-conductive tank is
used).