Shenzhen ZhongNuo Inspection & Technology Co., Ltd. specializes in the calibration, certification, and measurement services for gas alarms, combustible gas detectors, toxic and harmful gas detectors, and other equipment at various locations. We are qualified to serve nationwide, providing solutions for electrical safety and explosion-proof fire prevention issues to facilitate safe production.
The calibration cycle for flammable gas detectors is typically once a year.
In accordance with the standard JJG 693-2011 "Flammable Gas Detectors," the calibration period for flammable gas alarms generally does not exceed one year. This means that under normal circumstances, a comprehensive calibration and testing of the flammable gas alarm is required annually to ensure its performance meets the relevant requirements.

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 gas standards can be expanded with isopropanol, etc. If the instrument does not specify the type of gas being measured, the concentration of the gas at the set point for methane, ethane, or other gases 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 gas standard substance should be converted to match the measuring unit of the inspected instrument when in use.

Power-on inspection
Upon power-on, the instrument should operate normally with clear and complete display sections. Check the alarm function and the alarm trigger values.
Alarm function and alarm action value verification
The instrument's acoustic and visual alarms should be functioning normally. Insulation resistance
Insulation resistance for equipment using AC power should be no less than 20MΩ.

The principle of instrument detection mainly includes catalytic combustion, infrared absorption, and thermal conductivity types. Sampling methods include diffusion and aspiration. The instrument is mainly composed of detection elements, amplification circuits, alarm systems, and displays, used for monitoring the concentration of combustible gases in the environment.
Shenzhen Zhongnuo Testing Technology Co., Ltd. is a third-party institution specializing in electrical safety, electrical explosion-proofing, gas alarms, and toxic and harmful gas alarm instruments for regular inspections, metrological measurements, and calibrations. We are qualified to address fire and explosion prevention issues for our clients.