The Model 201-100-SLD
is an 8-pin plug-in style seal-leak detector to  sense seal failures on submersible pumps. A microcontroller-based relay that monitors the shaft
seal of a submersible pump motor. A resistive probe is installed in the seal cavity. If water leaks into the pump, the resistance measured by the probe decreases. When the resistance drops below the sensitivity setpoint, the unit will trip and the relay contacts will change state. The unit will
automatically reset when a fault is cleared.