Q35: What gas do you use for calibration?
A: We commonly use N₂ for calibration, but we can also calibrate with the customer’s actual gas. In addition, for multi-gas applications, we can perform multi-point calibration or mixed-gas calibration.
Q36: Can you calibrate on site?
A: Some models support on-site zeroing and simple calibration; however, precision calibration usually requires a standard flow device. Therefore, for high-accuracy requirements, we recommend returning the device to our factory for calibration.
Q37: Do you provide calibration certificates?
A: Yes, we can provide factory calibration certificates. Moreover, if necessary, we can also provide third-party or ISO 17025 traceable certificates, depending on the contract.
Q38: How do you clean the MFC?
A: We do not recommend that users disassemble the MFC by themselves. You can clean the exterior, but if internal contamination occurs, you should return the device to our factory for handling. In addition, purging the MFC thoroughly before use can reduce contamination.
Q39: What routine maintenance does an MFC require?
A: You should check the airtightness, filter, zero point, communication, power supply, and response speed. In addition, calibrate the MFC regularly, and if you notice any flow abnormality, troubleshoot it promptly.
Q40: How long does the sensor last?
A: Under normal use and maintenance, the sensor can operate for many years; however, its lifespan depends on gas cleanliness, temperature, humidity, and frequency of use. When accuracy decreases, you can either calibrate the MFC or replace the sensor.
Q41: What may cause a decrease in accuracy?
A: Several factors may cause this, such as zero drift, sensor aging, valve orifice contamination, impure gas source, insufficient pressure differential, temperature changes, and failure to calibrate with the actual gas.
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