The Sample Cooler Function Test is a diagnostic test to verify the correct functioning of the Sample Thermostat. The test takes up to 15 min to complete and returns a pass/fail type result. If the test failed or was aborted by the system, the final report will include some information on the possible root causes.
Before the test starts, the compressor is turned off to allow the system to reach the initial conditions. The test starts with acquiring data from the evaporator temperature sensor. If the reading is stable for at least 10 s (ΔT < 0.5 °C), the compressor turns on and the temperature inside the thermostat starts to drop.
For the test to succeed, the system must pass three temperature checkpoints in a timely manner. These checkpoints are the following:
Checkpoint 1: The temperature drops by 1/3 of the difference between the starting temperature and 5 °C.
Checkpoint 2: The temperature drops below 5 °C.
Checkpoint 3: The temperature stabilizes at a value below 5 °C and stays stable for at least 60 s (ΔT < 1.0 °C).
For a Sample Thermostat, the heater resistance of the heating elements will also be tested and checked if the measured value is within the acceptance range (5 – 9 Ohm).
NOTE
Lab Advisor B.02.11 or higher is needed for testing the heater resistance of the G7167-60101 Sample Thermostat.
NOTE
Lab Advisor 2.19 or higher is needed to execute the Sample Cooler Function Test for the G7167-60201 Sample Thermostat.
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