Shenzhen Zhongnuo Testing 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 in various locations. We provide services nationwide, addressing electrical safety and explosion-proof fire prevention issues for clients, and contributing to safe production.
Gas Detector Alarm Calibration Specification Requirements
Regulation 5.5 of the "Regulations for the Verification of Flammable Gas Detectors" (JJG693-2011) states: The verification cycle for flammable gas detection and alarm instruments: Generally, the verification cycle of the instrument should not exceed one year. Instruments with suspected measurement data, replaced with major components, or repaired should be promptly sent for verification.
Section 3.5 of the "Code for the Use of Combustible Gas Detection and Alarm Systems" (SY6503-2000) stipulates: The combustible gas detection and alarm systems in use shall be calibrated periodically as per the regulations.
Occupational Health and Safety Standard for the Installation of Toxic Gas Devices in Workplaces (GBZ/T223-2009), Article 7.2.1 stipulates: Calibration of detection and alarm devices shall be performed regularly according to the manufacturer's specified time and procedures.
Regulation 3.4 of the "Standard for the Use of Combustible Gas Detectors and Alarms" (SY6503-2000) stipulates: Combustible gas detectors and alarms for installation and use should have measurement instruments manufactured by an institution recognized for their**explosion-proof performance**.

Appearance and structure
The instrument should not have any surface damage that affects its normal operation. The surface of newly manufactured instruments should be smooth and clean, with even paint and plating layers, and no peeling or rusting.
The instrument's connections are reliable, and all knobs or buttons should operate and control normally.
Logos and trademarks
Instrument name, model, manufacturer, date of manufacture, serial number, explosion-proof marking and number, as well as the manufacturing metrological instrument license marking and number for domestic instruments should be clear.

Verification Method
Appearance and structure
Inspect and feel according to requirements of Section 4.1
Logos and Branding
Conform to the 4.2 requirements by visual inspection.
Power-on inspection
Inspect visually and by touch in accordance with 4.3 requirements to check the 5.3.4 alarm function and alarm action values.
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 properly and record the instrument's reading when it alarms. Repeat the measurement three times, with the arithmetic mean of the three readings being the instrument's alarm trigger value.

Which gas detectors require regular calibration and verification?
Fixed-installed, handheld, portable gas detectors, gas alarm instruments, toxic and harmful gas detectors/alarm, flammable gas detectors/alarm, gas analyzers, etc.
Shenzhen Zhongnuo Testing Technology Co., Ltd. is a third-party institution specializing in electrical safety, electrical explosion-proofing, gas detectors, and toxic gas alarm instruments, offering regular inspections, metrological measurements, and calibrations. We hold the necessary qualifications to assist customers in solving fire and explosion prevention issues.