Over-temperature is detected by a normally-closed-low temperature switch mounted on the stator.
Seal leakage is detected by either a resistive float switch or a pair of conductive probes installed in the seal cavity.. SPM Series Submersible Pump Monitor Dual Function Alarm Relay For S models over-temperature reset can be configured by changing the reset switch.The ATC Diversified Submersible Pump Monitor is a specialized control for monitoring the shaft seal and stator temperature of a submersible pump motor.