Dwyer Instruments: Series SLD, Single Channel Leak Detection Relay
Shaft Seal Leak Protection
Series SLD Single Channel Leak Detection Relay is used to monitor the shaft seal of a submersible pump to detect a leak 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. The SLD offers normally open and normally closed relay contacts to energize an alarm and de-energize the pump in the event of a leak. When the seal failure condition clears, the relay automatically resets.