Electronic Temperature Monitor
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A
PPENDIX
C
–
Error Codes
During normal operation the system is constantly checking itself for proper
operation. If a failure is detected, the fans are turned ON and the unit is put into
the alarm state. The unit will then operate as follows:
♦
Failed Sensor
•
Show “- - -“ on the display during the time when that sensor value would be
displayed
•
Show which sensor is bad
•
System continues to function using the remaining input channels
♦
Failed A/D Converter
•
Show “E11 on all channels
♦
Failed Ambient Temperature Sensor
•
Show “E22” on all channels
•
Set ambient temperature at 30
o
C
•
Continue to operate using 30
o
C ambient
♦
Failed EEROM After Initial Start-up
•
Show “E33” on all channels
•
Continue to operate
♦
Failed EEROM at Power-up
•
Show “E33” on all channels
♦
Failed Display Driver
•
Continue to operate
♦
Failed Microprocessor
•
Unit will not operate but failure is detected. The FANS will turn ON and
ALARM relay will be in the alarm state.
♦
Intermittent sensor connection
•
If there is an intermittent sensor the alarm and fan relays will latch ON.
During the time the sensor is open the display will show “- - -“. During the
time the sensor is closed it will show b – C (bad connection). Once the
problem is resolved, push the SILENCE button to unlatch the alarm and fan
relays.
♦
Reversed Thermocouple
•
If a thermocouple is installed with the wires reversed, the temperature reading
will go down as the temperature of the thermocouple goes up. If the
thermocouple temperature is 30°C colder than the temperature inside the unit,
the unit will operate the alarm and the fan relay contacts, and the display will
show - - -.
•
There may be cases where this feature will cause a false alarm. The reversed
thermocouple detection can be turned off as described in Appendix A.
