Thermo Technologies Thermo Alarm - Manual (Page 4)

Thermo Technologies
August 2002
Exact temperature reading depends on sensor location. It is
recommended to calibrate desired temperature range to match
refrigeration calibration scale. Following procedure allows qualified
personnel to adjust the unit’s calibration. There are two adjustments
for each mode (Fresh/Frozen). One is for high temperature alarm and
the other one is for low temperature alarm. Both sensors are identical
with 1% accuracy.
After opening the cover, you will see four adjustable pots as shown in
the above photo. Pot 1 and 4 are adjusting frozen food ranges while
2 and 3 are responsible for fresh food calibration. Furthermore, pot 1
and 2 are for low limit while 3 and 4 setting the high limit. These pots
are set at the factory for following temperatures:
•
Frozen Food Mode - Pot 1 setting for low limit is –20 F, Pot 4
setting for high limit is +10 F
•
Fresh Food Mode - Pot 2 setting for low limit is + 33 F, Pot 3
setting for high limit is +45 F
Temperature of ThermoAlarm in fresh food mode ranges from + 26 F
to + 68 F and in frozen food mode from + 26 F to – 20 F. Qualified
operators should follow the following steps to change (calibrate) the
factory settings for fresh food (for example + 30 F to + 50 F):
1. Make sure that sensors mounted in desired locations.
2. Turn Pot 2 counter clockwise and Pot 3 clockwise all the way.
The amber LED light flashes if container temperature is more
than + 68 F or less than + 26 F.
3. Wait until the chamber reaches and settles at the desired high
temperature of + 50 F.
4. Gradually turn Pot 3 counter clock wise until the amber LED
flashes, let the system cool down more. The LED should be off
after a while.
5. Monitor the temperature fall until it settles at the desired low
point.
6. Now turn Pot 2 clockwise until LED flashes again.
AFTER INITIAL INSTALLATION AND RANGE CHANGES, MAKE
SURE TO TEST THAT THE SYSTEM WORKS CORRECTLY IN
THE DESIRED RANGE!