Shenzhen ZhongNuo Testing Technology Co., Ltd. specializes in the calibration, verification, and measurement services for gas alarms, combustible gas detectors, and toxic gas analyzers for various locations. We hold qualifications to serve nationwide, addressing electrical safety and explosion-proof fire prevention issues for clients, and contributing to safe production.
The detection principle of the instruments mainly includes catalytic combustion, infrared absorption, and thermal conductivity types. The sampling methods include diffusion and aspiration. The instruments are primarily composed of detection elements, amplification circuits, alarm systems, and displays, used for monitoring the concentration of combustible gases in the environment.

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

Gas Standard Material
The standard gas used should be a substance of the same type as the gas being measured by the instrument, such as methane, ethane, or a gas standard can be isobutanol, etc. If the instrument does not specify the type of gas being measured, the concentration of the gas at the alarm set point is approximately 60% of the full scale. The uncertainty of the standard gas concentration is not more than 1% (for gas standards with a relative standard uncertainty greater than 1%), and the flow rate indication error of the repetitive dilution device should not be higher than 0.%. The concentration unit of the dilution device for standard gas substances should be converted to match the measuring unit of the instrument being tested, and the deviation should not be greater than 0.%.

Regular inspection content for gas alarms
Installation spacing of inspection (probe) points
2. Installation Height of the Detector
3. Indicated Error (Concentration)
4. Repetition (Concentration)
5. Alarm Error (Concentration)
6. Response Time (seconds)
Shenzhen ZhongNuo Testing Technology Co., Ltd. is a third-party institution specializing in electrical safety, electrical explosion-proofing, gas alarm systems, and toxic/hazardous gas alarm instrument calibration, periodic inspection, and metrological services, qualified to address fire and explosion prevention issues for customers.