Shenzhen ZhongNuo Testing Technology Co., Ltd. specializes in the calibration, certification, and metrological services for equipment such as gas alarms, combustible gas detectors, and toxic gas detectors for various locations. We offer services nationwide, addressing clients' electrical safety and explosion-proof fire prevention issues, and contributing to safe production.
Regulatory Content and Methods for Regular Detection of Flammable Gas Detectors
Annual inspections of industrial and commercial alarm sensors are conducted regularly, primarily to check for accuracy errors, repeatability, drift, and response time of the alarms to ensure they meet standards. Additionally, the suitability of the alarm installation location and any interference from other equipment are also inspected.

Gas Detector Alarm Calibration Specification Requirements
Regulation 5.5 of the "Regulation for the Verification of Flammable Gas Detectors" (JJG693-2011) states: The verification cycle for flammable gas detection and alarm instruments: The verification cycle of the instrument generally should not exceed one year. If there is any suspicion about the measurement data of the instrument, or if the instrument has been replaced with major components or repaired, it 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: Combustible gas detection and alarm systems in use shall be calibrated regularly as per the regulations.
The "Regulation for the Installation of Toxic Gas Devices in Workplaces" (GBZ/T223-2009), Article 7.2.1 stipulates: Calibration of detection and alarm devices should be carried out regularly according to the manufacturer's specified time and procedures.
Section 3.4 of the "Code 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 **manufacturing** and **explosion-proof** performance.

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

Verification Method
Appearance and structure
Inspect visually and by touch in accordance with requirements of 4.1
Logos and Branding
Conform to requirement 4.2 by visual inspection.
Power-on inspection
Inspect visually and by touch, as per requirements 4.3, to check the 5.3.4 alarm function and alarm action values.
Introduce a standard substance with a gas concentration greater than the alarm set point, causing the instrument to trigger an alarm. Observe if the instrument's audible and visual alarms are functioning properly and record the instrument's reading at the time of the alarm. Repeat the measurement three times, with the arithmetic mean of the three readings being the instrument's alarm action value.
Shenzhen Zhongnuo Testing Technology Co., Ltd. is a third-party institution specializing in electrical safety, electrical explosion-proof, gas alarm, and toxic gas detection equipment for regular inspections, calibration, and metrological services. We are qualified to provide solutions for fire and explosion prevention issues for our clients.