TEMPERATURE & SEAL LEAKAGE 
TCP Series
The TCP Series protects submersible pump motors against damage from both seal
leakage and over temperature. Two wires are connected to a resistive-sensing
probe and common in the seal cavity to monitor for seal leakage. Two additional
wires are connected to a N.C. thermal switch in the windings of the pump motor
to monitor for over-heating. The product has isolated output contact relays, one
for seal leak and one for over temperature. The over temperature set-point isfi xed
at 5K ohms. Two adjustable seal leak sensitivity ranges are available: 4.7K-100K
ohms and 1K-250K ohms.
Operation:
With input voltage applied, normal temperature condition (thermal switch closed)
and no seal leak, the over temperature relay is energized and the seal leak relay is
de-energized. Both LEDs are Green. 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 seal starts to leak, contaminating fl uid enters the seal 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 LEAK LED turns Red. These products
will automatically reset when the fault condition clears.
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