May not be exact product—for reference only.
- Family: SEAL LEAKAGE & OVER TEMPERATURE RELAY
- Function: OVER TEMPERATURE & SEAL LEAKAGE | AUTO & MANUAL RESET
- Timing Range: Sensitivity Range: 1K - 250K Ohms
- Control Voltage: 24V AC
- Output: 7A SPDT & SPNO
Two wires from the relay are connected to a N.C. thermal switch in the windings of the pump motor to monitor for overheating. A low-voltage DC signal is applied to check the status of the thermal switch. Two additional wires are connected to a single or dual resistance-sensing probe and the grounded motor housing, or across two probes to monitor for seal leakage using a low-voltage DC signal. These products have isolated output contact relays, one for over temperature and one for seal leakage. The over temperature set-point is fixed at 5K ohms. Two adjustable seal leakage sensitivity ranges are available: 4.7K-100K ohms and 1K-250K ohms.
With input voltage applied, normal temperature condition (thermal switch closed) and no seal leakage, the over temperature relay is energized and the seal leak relay is de-energized. Both LEDs are Green, indicating normal conditions and input voltage applied. When the motor temperature rises and the N.C. thermal switch opens, the over temperature relay is de-energized, opening a contact that had been closed and turning off the pump contactor. The TEMP LED turns Red. If the over temperature condition is cleared, the unit will reset based on the setting of the Over Temp switch. In the AUTO mode, the unit will reset automatically. In the MANUAL mode, the Over Temp Reset button must be pushed to clear the alarm and reset the relay.
If the seal starts to leak, contaminating fluid enters the pump motor cavity. This lowers the resistance between the internal probe and the common connection. When the resistance drops below the user-adjustable sensitivity set-point of the relay, the output relay energizes and closes a contact, which can be used to give an alarm indication of a leaking seal. The SEAL LED turns Red.
- Voltage Tolerance: AC Operation: +10/-15% of nominal at 50/60 Hz.
- Load (Burden): 3 VA
- Indicator LEDs:
Seal Leak: Green ON with input voltage applied and no seal leak; Red ON when seal leak detected and relay energized
Temperature: Green ON with input voltage applied, normal temperature condition and relay energized; Red ON when over temperature detected and relay de-energized
- Probe Voltage: 5V DC Pulsed
- Response Time: Pick-up & Drop-out: 1 Second
- Output Contacts: 7A @ 240V AC/7A @ 28V DC, 1/4HP @ 120V AC (N.O.)
- Life: Mechanical: 10,000,000 operations; Full Load: 100,000 operations
- Temperature: -28o to 65o C (-18o to 149o F)
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