Introduction to Daily Maintenance and Calibration of Portable Gas Detectors
Portable gas detector is a detection instrument used to detect oxygen deficiency, explosion, and other toxic hazards, and can emit an alarm to protect human and property safety. If these instruments cannot be used correctly and reasonably, the consequences would be unimaginable. At the same time, in order for the gas detector to function properly, it is necessary to maintain the detection instrument. According to the maintenance cycle of portable gas detectors, they can be divided into daily maintenance and regular maintenance.
Daily maintenance
The main task of daily maintenance is to check the overall appearance of the portable gas detector and the battery level. At the same time, in order to ensure the correctness of the portable gas detector detection, it is necessary to conduct rapid testing to detect the correctness and accuracy of the instrument sensor's response to the gas. For instruments with built-in pumps, it is also necessary to check the airtightness of the pump suction system (specific operation method: after opening the instrument, block the intake terminal of the pump suction system, such as the top of the sampling probe, and send a pump flow blockage alarm directly to the instrument, indicating that the airtightness of the pump suction system is normal, otherwise the instrument cannot be used).
Regular maintenance
Due to the fact that the sensors of portable gas detectors are measuring instruments, there may be detection deviations over time. Therefore, it is necessary to regularly correct such deviations for portable gas detectors, which is commonly referred to as calibration. According to the requirements of the International Association for Safety Equipment, there is no fixed period for regular calibration. It is determined by the actual environment and frequency used for portable gas detectors. As long as the instrument cannot pass rapid testing, it indicates that the deviation of the instrument sensor has been too large, which will affect the test results and calibration is required.
In order to facilitate users to better define the management of portable gas detectors, we generally recommend that customers conduct regular maintenance, including calibration, on the portable gas detector at least once every six months. At the same time, for the pump suction portable gas detector, additional regular maintenance is required, including regular inspection of the filtration device of the pump suction system (mainly checking the internal filtration membrane of the pump suction product to see if it has failed. The method to determine the failure is to observe the color change of the filtration membrane. The clean membrane color is pure white, and the failed filtration membrane color is yellow black).
When working in the following environments, it is necessary to consider conducting rapid testing, calibration checks, or calibration of portable gas detectors:
1. Long term exposure or use in abnormal environments, such as high/low, high/low humidity, or airborne particulate environments.
2. Exposed to high concentration (or over range) target gases or vapors.
3. Catalytic combustion sensors react to environments where the filament is exposed to toxic or inhibitory gases for a long time.
4. The electrochemical sensor is exposed to solvent vapors and highly interfering gases.
5. Poor storage and operating environments, such as portable gas detectors, may fall onto hard surfaces or sink into water, which can have an impact on instrument circuits.
6. The storage and monitoring of portable gas detectors have changed.
7. When the working environment of a portable gas detector changes and may affect the normal use of the sensor.
