In order to reduce the occurrence of equipment failures in freeze-drying machines, extend their service life, reduce production costs, and ensure normal production, daily inspections of freeze-drying machines are also important.

1、 Refrigeration system

1. Check that all shut-off valves (compressor suction, exhaust valves, supply valves, hand valves, etc.) are in the open position and have normal readings.

2. Turn on the compressor and check if the sound is normal. If it is abnormal, first check if the three-phase power supply is balanced.

3. Check if there is any abnormal vibration in the refrigeration pipe, and if so, take appropriate fixing measures.

4. Check all operating parameters and identify the cause of any abnormalities for handling.

2、 Vacuum system

1. Before starting the vacuum pump, check if the oil level of the vacuum pump is about 1/2 of the sight glass. If it is not enough, add it in time.

2. The vacuum pump starts to vacuum the box, ensuring that the rear box is dry. If there is water vapor, the condenser temperature should be kept below -45 ℃.

3. Check if the pump can reach the maximum vacuum within normal time, observe if there is any noise during the operation of the vacuum pump, and if there is any looseness in the connecting parts of the vacuum pump oil and pump head. If there are any problems, deal with them.

4. Open the air vibration valve of the vacuum pump every week and run it for about 2 hours without load to check whether the pump body leaks oil and whether there is any noise during operation. If there are any problems, deal with them.

3、 Circular system

1. Before starting up, check the direction of operation of the circulation pump (green indicator light on indicates normal, red indicator light on indicates reverse).

2. Check if the balance tank liquid level, circulating pump pressure, heat transfer oil temperature and other parameters are normal. If there are any abnormalities, identify the cause and solve them.

4、 Pneumatic system

1. Confirm if the air pressure is normal, and adjust it if there are any abnormalities.

2. Check if the lubricating oil level of the lubricator is normal, and add it promptly if it is missing.

5、 In place disinfection system

1. Before starting up, inspect the pipelines, safety valves, steam traps, inlet/outlet valves, inspection doors, and door safety systems, and promptly handle any abnormalities.

2. Before starting steam sterilization, make sure the door is in a safe position.