Nutech Atmospheric Pre ConcentratorIt is the core pre-treatment equipment for atmospheric VOCs (volatile organic compounds) detection, and its stability directly affects the accuracy of detection data. Daily maintenance should follow the principle of "regular cleaning, component maintenance, and status verification". The following are specific maintenance points:
1、 Daily maintenance (must be done before startup/after shutdown)
Appearance and pipeline inspection
Wipe off the dust on the instrument casing, check whether the injection pipeline and connecting joints are loose or damaged, and avoid sample loss or contamination caused by pipeline leakage.
Check if there is condensation or residual impurities in the pipeline, and if so, promptly blow the pipeline with dry nitrogen gas.
Confirmation of gas source status
Check whether the pressure of the carrier gas (high-purity nitrogen) and purge gas is within the required range of the instrument (usually 0.3-0.5MPa), and whether the remaining capacity of the gas cylinder is sufficient to prevent interruption of operation due to insufficient gas source.
Waste liquid/solvent cleaning
Empty the waste liquid bottle that comes with the instrument to prevent it from overflowing and corroding the instrument components. After cleaning, seal it properly to prevent volatilization pollution.
2、 Weekly maintenance (ensuring the performance of core components)
Cleaning and activation of capture traps
If the adsorption efficiency of the capture trap decreases (manifested as a decrease in the recovery rate of the target substance), it is necessary to perform high-temperature activation according to the instructions (usually 200-300 ℃, nitrogen purging for 30-60 minutes) to remove residual impurities in the trap.
Strictly prohibit over temperature activation to avoid damaging the trap packing.
Inspection of the sealing ring of the injection port
Check whether the sealing ring of the injection port is aging or deformed. If there is air leakage or poor sealing, replace the same type of accessory in a timely manner to prevent sample leakage from affecting the test results.
Filter replacement
Replace the particulate filter at the front end of the air inlet to prevent dust and aerosols from entering the instrument and blocking the pipeline or contaminating the trap.
3、 Monthly maintenance (in-depth maintenance, extending component life)
Condenser maintenance
Check the cooling effect of the condenser and confirm that the set temperature is consistent with the actual displayed temperature (usually around -150 ℃). If the temperature difference exceeds 5 ℃, contact after-sales calibration or maintenance of the refrigeration module.
Regularly clean the dust on the condenser fins to ensure heat dissipation efficiency and avoid refrigeration failures caused by poor heat dissipation.
Pump body maintenance
Perform an oil level check on the built-in vacuum pump of the instrument (if it is an oil pump), replenish the dedicated vacuum pump oil when the oil is insufficient, and replace it promptly when the oil is cloudy to prevent pump body wear.
Dry vacuum pumps require regular cleaning of the pump chamber filter screen to maintain smooth air intake into the pump body.
Data and program verification
Export the instrument operation log, verify whether the recent operating parameters (temperature, pressure, purge time, etc.) are stable, and if there are abnormal fluctuations, promptly investigate the cause and calibrate.
4、 Quarterly/Annual Maintenance (Professional level maintenance, recommended factory support)
Capture trap replacement
The trap packing has an adsorption saturation period (usually 3-6 months, depending on the sample matrix). When the repeatability of the target substance deteriorates, a new trap needs to be replaced, and performance verification is required after replacement.
Overall sealing test
Using helium leak detection method to conduct sealing test on the overall pipeline of the instrument, ensuring no leakage points and guaranteeing pre concentration efficiency.
Calibration of key components
Contact the original factory or professional organization to calibrate core components such as temperature sensors, pressure sensors, and flow controllers. Calibration data must be archived and filed to ensure that the instruments meet the testing standards.
5、 General precautions for maintenance
Before maintenance, the power and gas supply of the instrument must be turned off, and anti-static measures must be taken to avoid damaging the circuit during live operation.
All replaced accessories must be Nutech original or compatible genuine products, and it is strictly prohibited to mix non-standard accessories that may cause instrument failure.
establishNutech Atmospheric Pre ConcentratorMaintain a ledger to record the time, content, replacement part models, and calibration data of each maintenance, facilitating the traceability of instrument status.