Shenzhen Zhongnuo Testing Technology Co., Ltd. specializes in the calibration, verification, and measurement services for gas alarms, flammable gas detectors, toxic and harmful gas detectors, and other equipment in various locations. We hold qualifications to serve nationwide, addressing clients' electrical safety and explosion-proof fire prevention issues, and contributing to safe production.
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.

Calibration Method
Appearance and structure
Inspect visually and by touch according to the requirements of 4.1
Logos and Branding
Follow 4.2 requirements as observed visually.
Power-on Inspection
Inspect visually and by touch in accordance with the requirements of 4.3 to check the alarm function and alarm action values as per 5.3.4.
Introduce a standard gas substance with a concentration exceeding the alarm set point, causing the instrument to trigger an alarm. Observe whether the instrument's sound and light alarm functions normally and record the instrument's reading when the alarm is triggered. Repeat the measurement three times, and the arithmetic mean of the three readings is the instrument's alarm trigger value.

Measurement Instrument Control
Instrument control includes calibration, subsequent calibration, and in-use inspections.

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 detectors typically does not exceed one year. This means that under normal circumstances, a comprehensive calibration and testing of the flammable gas detectors should be conducted annually to ensure their performance meets the relevant requirements.
Shenzhen ZhongNuo Testing Technology Co., Ltd. is a third-party institution that offers regular calibration, metrological services, and calibration for electrical safety, electrical explosion-proofing, gas detectors, and toxic gas alarm instruments, as well as资质to address fire and explosion prevention issues for customers.