All alarms for the TEC 3000 controllers have a built in time delay. The audible and visual alarms will not activate until 60 seconds after the alarm condition is present, meaning any parameter (level, temperature, etc) exceeds the programmed high or low threshold (high temperature alarm, low level alarm, etc). For parameters that may temporarily exceed the programmed thresholds, the time delay is intentional and is intended to prevent “nuisance alarms”. When validating the function of the freezer, this behavior needs to be considered.
Consider the following procedure when testing the high temperature alarm on a freezer:
· From the controller keypad, initiate “Hi Temp Alarm Test”. (In the “temperature settings” menu this function can be found).
· Monitor the temperature of the probe being tested. Measure the amount of time it takes for the audible alarm to sound, to when the temperature exceeds the high temperature alarm setting (default is -110°C). This time should be 60 seconds.
· The controller is functioning properly if the alarm sounds 60 seconds after the temperature exceeds the high temperature alarm setting.
Note
Before the audible alarm sounds it is common for the displayed temperature to read -50°C or more because the temperature probe heats rapidly during the high temperature alarm test. Due to the previously mentioned built-in time delay for all alarms this operation is normal. Consult the TEC 3000 Technical Manual or contact Technical Service at 1-800-482-2473 for questions regarding alarm delays.
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