Sentry II with Water Works Box Operating Instructions Effective April 1, 2000
Part No. 8823728 Revised November 10, 2003
4.3 Sentry II Thermocouple Sensor Wiring
1. Route the thermocouple cable from the right-hand access opening through the internal conduit to
the left-hand access opening in the milk cooler.
2. Route the thermocouple cable from the left-hand access opening through the internal conduit to
the top-rear junction box of the milk cooler.
3. Mating copper (+) to copper (+) and constantan (-) to constantan (-), splice the thermocouple
cable to the thermocouple extension cable in the top-rear junction box of the milk cooler with
non-metallic wire nuts. See “Important Thermocouple Splicing Information” in Section 4.4.
4. Cut and insulate the foil shield and drain wire of the thermocouple extension cable at the top-rear
junction box. The drain wire should be grounded (one end only) at the Sentry II control cabinet.
5. Route the thermocouple extension cable from the rear junction box to the wall-mounted Sentry II.
Avoid routing this cable in conduit that contains high-voltage conductors.
6. Connect the copper (+) thermocouple conductor to Terminal No. 11 and the constantan/silver (-)
to Terminal No. 10 of the temperature control. Connect the drain wire to the electrical ground in
the Sentry II enclosure. See Figure 24.
Figure 23 - Sentry II Thermocouple Sensor Wiring
26
INTERNAL CONDUIT
RACEWAYS TO TOP-REAR
JUNCTION BOX
LEFT-HAND
ACCESS OPENING
A CONDUIT RACEWAY LOCATED BETWEEN THE
INNER AND OUTER MILK COOLER SHELL CONNECTS
THE REAR JUNCTION BOX TO THE RIGHT AND LEFT
ACCESS OPENINGS
RIGHT-HAND
ACCESS OPENING
THERMOCOUPLE
RACEWAY
IF SPLICING IS REQUIRED,
USE NON-METALLIC WIRE
NUTS ONLY
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