Series LDT is used to monitor the shaft seal and the stator temperature of a submersible pump to detect a leak or overtemperature before pump failure. A leak is detected by sensing the status of a float or conductivity switch installed in the seal cavity. When this resistance drops below the set sensitivity, the output relay energizes and the LED indicator illuminates. When the seal failure condition clears, the relay resets automatically. A normally closed temperature switch mounted on the stator detects overtemperature.
Dwyer Instruments Inc., (800) 872-9141