Shenzhen ZhongNuo Testing Technology Co., Ltd. specializes in the certification, calibration, and metrological services for gas alarms, flammable gas detectors, toxic and harmful gas detectors, and other equipment in various locations. We are fully licensed to serve nationwide, providing solutions for all types of electrical safety and explosion-proof fire prevention issues, facilitating safe production.
Gas Standard Material
We use gas standard substances of the same type as the gas measured by the instrument, such as methane or ethane, or alternative substances like isopropanol can be used. If the instrument does not specify the type of gas being measured, the concentration of the gas at the set point is approximately 60% of the full scale. The uncertainty of the expanded gas standard substance is not more than % (k-body standard substance greater than ±1%). The flow indication error of the repetitive dilution device should not be greater than 0.%. The concentration unit of the dilution device for gas standard substances should be converted to match the unit of the instrument being tested, and the discrepancy should not exceed 0.%.

Measurement Equipment Control
Instrument control includes calibration, follow-up calibration, and in-service inspection.

Which gas detectors require regular calibration and verification?
Fixed-installed, handheld, portable gas detectors, gas alarm instruments, toxic and harmful gas detectors/alarm systems, flammable gas detectors/alarm systems, gas analyzers, etc.

How often should various gas detectors be periodically calibrated and verified?
Instrument recalibration is typically every 1 year, determined by the submitting unit based on actual usage. During the secondary calibration process, if there are doubts about the instrument's test data, or if the main components of the instrument are replaced, or if recalibration is required after repairs.
Shenzhen ZhongNuo Testing Technology Co., Ltd. is a third-party institution specializing in electrical safety, electrical explosion-proofing, gas alarm systems, and toxic and harmful gas detection instruments for regular inspections, calibration, and metrological services. We hold the necessary qualifications to assist clients in solving fire and explosion-proofing issues.