1、 Daily basic maintenance
1. Check before startup
Check the sealing of power cables, pipeline interfaces, and display screen parameters daily, and establish an "Equipment Operation Log" to record key data (such as pressure values and alarm information). After the work is completed, residual samples should be emptied to avoid the retention of corrosive components.
2. Core component cleaning
Components that come into direct contact with the sample, such as injection valves and quantitative rings, should be wiped with anhydrous ethanol to prevent salt crystals or particulate matter from blocking the flow channel.
2、 Special maintenance of core system
1. Maintenance of refrigeration system
Check the cleanliness of the cooling fan and filter screen of the semiconductor refrigeration module every month. The liquid nitrogen assisted cooling system needs to test the vacuum level of the Dewar flask and replace the sealing ring.
The cold and hot exchange interface should be uniformly coated with thermal conductive silicone grease to avoid an increase in thermal resistance and energy consumption.
2. Deep cleaning of pneumatic system
Disassemble stainless steel corrugated pipes, one-way valves and other components every quarter, use ultrasonic cleaning machines to remove organic matter deposits, and install molecular sieves inside the drying pipes to improve dehumidification efficiency.
3、 Periodic maintenance and calibration
1. Annual overhaul plan
Including high-temperature activation regeneration of pre concentration column, replacement of failed filter cotton, cleaning of circuit board and relay contact oxide layer, refrigerant filling needs to be completed by professional technicians.
2. Sensor calibration
The temperature sensor needs to be calibrated by a third party every year, and it is recommended to verify the flow controller (MFC) through a soap film flowmeter. The photoionization detector needs to be regularly purged with argon gas.
4、 Emergency and Storage Standards
1. Emergency power outage handling
Immediately shut down the carrier gas supply to prevent backflow and damage to the equipment.
2. Long term shutdown maintenance
Perform a complete flushing procedure, store in a constant temperature (5-35 ℃) and low humidity (<60%) environment, and secure rotating parts during transportation.
By implementing a three-level maintenance system (daily inspections, specialized maintenance, and periodic calibration), the lifespan of the equipment can be significantly extended, ensuring the efficient and stable operation of the low-temperature vacuum concentration system.