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The Preparation Of The Freeze Dryer Before Work
- Jun 20, 2017 -

It is well known that when the first use of a freeze dryer, we must thoroughly clean the parts of the dryer. We all know that stainless steel parts are cleaned with ethanol, and plexiglass is washed with physiological saline. The ampoule is cleaned with an ultrasonic cleaner, but what do we need to do before actually operating the freeze dryer?

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The freeze dryer must be pre-frozen before operation, and the pre-freeze needs to be prepared for a low-temperature refrigerator, minus 40 degrees Celsius, or a low-temperature refrigerator at minus 80 degrees Celsius. Place the prepared items in a low-temperature refrigerator or liquid nitrogen. Four hours or so, can be observed directly from the outside, the items completely frozen and solid, can be carried out freeze-drying experiments, the items quickly moved to the freeze dryer tray to ensure that the freeze-drying effect.

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Between the host and the vacuum pump by the green vacuum tube connection, the connection using the international standard clamp. In order to effectively prevent air leakage, the clamp is specially designed with a sealed rubber ring in the clamp, coated with an appropriate amount of vacuum grease on the rubber ring, and then clamped with a clamp to make the connection more tight fit Together, so as to effectively prevent leakage. If there is no clamping clamp, it will cause air leakage, resulting in the extraction of vacuum when the dashboard shows a digital value greater than 20pa, then you should check the vacuum pump and freeze dryer glass cover airtight.

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Freeze dryer The right side of the main board is equipped with two power outlets, one will be the vacuum pump power cord connected to the host, and then the second freeze dryer on the total power plug on the power.

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Before the vacuum pump must be checked whether to join the vacuum pump oil, or can not run properly. Oil surface shall not be lower than the center line of the oil mirror, the vacuum pump has just started to use a more intense jitter, slowly will become smooth.

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If the air tightness is not good, should be in the cold trap above the sealed rubber ring smear some vacuum grease, the organic glass cover light spin on the rubber ring, open the vacuum pump to test its sealing. To ensure its complete closure.