July 16, 2008 - Dwyer Instruments released the Series SLD Single Channel Leak Detection Relay.The Series SLD 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. Installation is made simple with the standard 11-pin socket mount.The SLD is available in three different sensitivities: 470 ohm fixed, 470 to 10 k ohm adjustable, and 4.7 k to 100 k ohm adjustable. All models utilize a 120 VAC control voltage.