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 in various locations. We hold qualifications to serve nationwide, addressing clients' electrical safety and explosion-proof fire prevention issues, and contributing to safe production.
Standard for calibration and verification of combustible and toxic gas detectors:
GB/T 50493-2019 "Design Standard for Detection and Alarm of Combustible Gases and Toxic Gases in Petroleum and Chemical Industry"
GB12358-2006 General Technical Requirements for Environmental Gas Detection and Alarm Instruments in Workplace
JJG 693-2011 "Regulation for Calibration of Combustible Gas Detectors"

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

Appearance and structure
The instrument should not have any appearance damage that affects its normal operation. The surface of newly manufactured instruments should be smooth and glossy, with even paint and plating layers, and no signs of peeling or rust.
The instrument's connections are reliable, and all dials or buttons should operate and control normally.
Branding and logos
Instrument name, model, manufacturer's name, manufacturing date, serial number, explosion-proof markings and numbers, as well as the domestic instrument's manufacturing measurement instrument license mark and number should be clear.

Verification Method
Appearance and structure
Inspect visually and by touch according to the requirements of 4.1
Logos and Branding
Inspection shall be conducted in accordance with requirement 4.2.
Power-on inspection
Inspect visually and by touch in accordance with requirements 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 at the time of the alarm. Repeat the measurement three times, and the arithmetic mean of the three readings is the instrument's alarm trigger value.
Shenzhen Zhongnuo Testing Technology Co., Ltd. is a third-party institution providing regular calibration, metrological testing, and calibration services for electrical safety, electrical explosion-proof equipment, gas detectors, and toxic and harmful gas alarm instruments. We have the qualifications to help customers solve fire and explosion prevention issues.