How to verify whether the exhaust gas treatment device of the VHPpass box is operating normally?

To verify whether the exhaust gas treatment device of the VHP transfer window is operating normally, the following aspects can be considered:
Appearance and component inspection
Daily inspection: After each use of the transfer window, check whether the appearance of the exhaust gas treatment device is damaged or deformed and whether there is any loosening or leakage in each connecting part. Special attention should be paid to checking the pipe connection points, valve interfaces, and other parts. If there are traces of hydrogen peroxide leakage, such as white crystals or dampness, it indicates that there may be a sealing problem, which will affect the exhaust gas treatment effect.
Component function inspection: Regularly check whether the key components of the exhaust gas treatment device, such as fans, filters, catalytic decomposers, etc., are working properly. Check whether the impeller of the fan can rotate normally and if there is any abnormal noise. To check if the filter is clogged, you can judge by observing the pressure difference before and after the filter. If the pressure difference exceeds the specified value, it indicates that the filter needs to be cleaned or replaced. For catalytic decomposers, it is necessary to check whether the catalyst inside has failed or formed lumps. This can be initially judged based on the appearance and usage time of the catalyst.
Performance test
Gas flow test: Use a professional gas flowmeter to measure the gas flow at the air inlet and outlet of the exhaust gas treatment device respectively. Under normal circumstances, the flow rate at the air inlet should be equal to that at the air outlet and fall within the flow range designed for the equipment. If the flow rate varies significantly, it might be due to a clogged pipeline or a faulty fan that causes poor gas delivery.
Hydrogen peroxide concentration detection: At the outlet of the exhaust gas treatment device, use a hydrogen peroxide concentration detector to regularly test the residual concentration of hydrogen peroxide in the exhaust gas. Generally speaking, the concentration of hydrogen peroxide in the exhaust gas after normal treatment should be lower than the safe emission standard, such as parts per million (ppm) level. If the concentration is detected to exceed the standard, it indicates that the decomposition or adsorption effect of the exhaust gas treatment device is poor, and the working conditions of components such as the catalytic decomposer and adsorbent need to be further inspected.
Disinfection effect verification: The sterilization effect of the exhaust gas treatment device on microorganisms can be verified through biological indicators. Place a biological indicator containing a certain number of microbial spores near the exhaust port of the tail gas treatment device. After a period of operation, take out the biological indicator for cultivation and observe the growth of microbial spores. If the microbial spores in the biological indicator are effectively killed, it indicates that the exhaust gas treatment device has a good disinfection effect on microorganisms, indirectly proving its normal operation. Conversely, if microbial spores grow, it may indicate that there is a problem with the exhaust gas treatment device and it is unable to effectively kill microorganisms.
Inspection of electrical and control systems
Electrical parameter inspection: Check the electrical system of the exhaust gas treatment device, including whether the power supply voltage, current, and other parameters are within the normal range. Use tools such as a multimeter to measure the input voltage and current of the motor to ensure they are consistent with the rated parameters of the equipment. If the voltage is too low or the current is too high, it may cause problems such as motor overheating and a decrease in speed, affecting the normal operation of the exhaust gas treatment device.
Control system function test: Check whether the control system of the exhaust gas treatment device, such as the automatic control program, alarm device, etc., is working properly. Test whether the automated control program can start and stop the exhaust gas treatment device according to the preset parameters and processes and whether it can issue alarm signals promptly when abnormal situations occur. For instance, when the hydrogen peroxide concentration exceeds the standard or the fan malfunctions, the alarm device should be able to immediately issue an audible and visual alarm to remind the operator to handle the situation.
Regular maintenance and calibration
Maintenance plan execution: Develop a detailed maintenance plan and, by the equipment manufacturer's recommendations and relevant standards, regularly maintain and service the exhaust gas treatment device, including replacing vulnerable parts, cleaning components, and adding catalysts, etc. Strictly implementing the maintenance plan is the key to ensuring the long-term stable operation of the exhaust gas treatment device.
Instrument calibration: For the instruments and equipment used to detect and monitor the exhaust gas treatment device, such as hydrogen peroxide concentration detectors and gas flow meters, regular calibration should be carried out to ensure the accuracy and reliability of the detection data. Calibrate the detector with calibrated standard gas and operate by the prescribed calibration cycle and method to ensure that the instrument can accurately reflect the actual operating status of the exhaust gas treatment device.