OBJECTIVE or GOAL
Defrost the sample compartment when:
- Frost or ice accumulates on the sample chamber engine assembly heat sink when operating low sample compartment temperature (near or at 4 °C) in high humidity environments.
- Recovering instrument performance within sample compartment temperature specification.
- ACQUITY UPLC Sample Manager
- ACQUITY H-Class SM-FTN
- ACQUITY I-Class SM-FTN
- ACQUITY I-Class SM-FL
Passive defrost: Passively warming the compartment to reach the temperature of the ambient environment without active control of the heat sink.
- Remove all sample vials and well plates.
- Set the Heater/Cooler engine to Off.
- Leave the SM-FTN powered-on.
- Ensure that the door remains closed.
- The circulating fan inside the sample chamber continues running and blowing air across the engine heat sink and melts the ice faster.
- After an hour, the unit should be fully defrosted and ready to resume operation.
Active defrost: If passive recovery of the sample compartment temperature was not successful, perform an active defrost.
- Control the sample compartment to 30C and wait until the sample temperature >20 degrees C.
- When sample temperature reaches room temperature, the engine's heat sink should be fully defrosted and ready to resume operation.