MICROSENTRY™ REFRIGERATION MONITOR
4.2 Sensors
The wine cellars and beverage centers utilize one (1) sensor, known as the control sensor. The control sensor (part
number 41050117) senses the interior temperature allowing the control to adjust and properly display the interior
temperature.
The following will happen in the event the sensor fails:
The display panel will flash “E1” for a sensor fault, indicating a problem with the sensor. 1.
The sensor can be checked by use of a multimeter with the ability to read resistance. To check the sensor:
Disconnect and remove sensor from unit.1.
Use a reference temperature point that is know (such as an ice bath) and measure the resistance across the 2.
wire leads.
Compare the recorded resistance with Table C.3.
If measured resistance falls outside the resistance given in Table C within 4% of the value, the sensor is bad and will
need to be replaced.
Table C: Resistance versus Temperature Chart
Temperature (C) Temperature (F) Resistance (K-OHMS)
-40 -40 19.565
-35 -31 14.817
-30 -22 11.335
-25 -13 8.756
-20 -4 6.824
-15 5 5.365
-10 14 4.251
-5 23 3.389
0 32 2.722
5 41 2.202
10 50 1.793
15 59 1.467
20 68 1.208
25 77 1.000
30 86 .8315
35 95 .6948
40 104 .5834
45 113 .4917
50 122 .4161
If the sensor has been tested and is found to be good, check the temperature of the evaporator plate and the resis-
tance of the sensor. If the temperature of the evaporator plate does not correspond to a proper resistance from the
sensor, check for a proper and secure connection of the sensor to the evaporator plate bracket.
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