Sentry II with Water Works Box Operating Instructions Effective April 1, 2000
Part No. 8823728 Revised November 10, 2003
Figure 24 - Sentry II Thermocouple - Temperature Control Wiring
4.4 Important Thermocouple Splicing Information
If it is necessary to splice the thermocouple cable, always mate copper to copper and constantan
(silver) to constantan (silver).
The thermocouple sensor must be wired continuously with Type “T” thermocouple cable. Do not use
ordinary copper wire.
Use non-metallic wire nuts, Mueller Part No. 8822361, to make all spliced thermocouple connections.
If thermocouple extension cable is required, Mueller Part No. 8820166, connect the drain wire to the
electrical ground at the Sentry II enclosure and cap and insulate the foil shield and drain wire at the
opposite end.
4.5 Sentry II Temperature Control Calibration Accuracy
Once the installation wiring is completed for the Sentry II control box, check the calibration accuracy
of the temperature control as outlined below:
1. Cover the bottom evaporator and agitator paddle with water or milk to check the temperature
calibration.
2. Allow the product temperature to stabilize for a minimum of 15 minutes.
3. Using an accurate electronic thermometer, determine the actual temperature of the water or milk in
the milk cooler.
4. If the known product temperature does not correspond with the temperature display, the
temperature control will require an input program correction. See Sections 4.6 and 4.7.
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