Shenzhen ZhongNuo Testing Technology Co., Ltd. specializes in the calibration, verification, and metrological services for gas alarms, combustible gas detectors, toxic and harmful gas detectors, and other equipment. We are qualified to serve nationwide, providing solutions for various electrical safety and explosion-proof fire prevention issues, contributing to safe production.
Gas Detector Alarm Calibration Specification Requirements
"Regulation 5.5 of the "Gas Detection Alarm Instrument Verification Code" (JJG693-2011) stipulates: The verification cycle for combustible gas detection alarms: the verification cycle of the instrument is generally not to exceed one year. Instruments with suspected measurement data, instruments that have replaced major components, or those that have been repaired should be sent for verification promptly."
Section 3.5 of the "Regulations 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.
Occupational Health Service - Code for the Installation of Toxic Gas Devices (GBZ/T223-2009) Article 7.2.1 stipulates: Calibration of detection and alarm devices shall be carried out regularly according to the manufacturer's specified time and procedures.
Section 3.4 of the "Regulations for the Use of Combustible Gas Detectors" (SY6503-2000) stipulates: Combustible gas detectors for installation and use shall have measurement instruments manufactured by an institution recognized for their**explosion-proof performance**.

Measurement Equipment Control
Instrument control includes calibration, subsequent calibration, and in-service inspection.

Gas alarm regular inspection content
Installation spacing of inspection (probe) points
2. Installation Height of the Detector
3. Indicated Error (Concentration)
Repetitive (Concentration)
5. Alarm Error (Concentration)
6. Response Time (Seconds)

Standard for calibration and verification of flammable and toxic gas detectors:
GB/T50493-2019 "Design Standard for Detection and Alarm of Combustible Gases and Toxic Gases in Petroleum and Chemical Industries"
GB12358-2006 General Technical Requirements for Environmental Gas Detection and Alarm Instruments in Workplace
JJG693-2011 "Regulation for Calibration of Combustible Gas Detectors"
Shenzhen Zhongnuo Testing Technology Co., Ltd. is a third-party institution that provides regular calibration, measurement, and certification services for electrical safety, electrical explosion-proofing, gas alarms, and toxic and harmful gas detectors, as well as资质 to address fire and explosion prevention issues for clients.