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, serving various locations across the nation. We address a range of electrical safety and explosion-proof fire prevention issues for clients, contributing to safe production.
GB 12358-2024 "General Technical Requirements for Environmental Gas Detection and Alarm Instruments in Workplace" is an important standard.
Intended to standardize the performance, functions, and testing methods of environmental gas detection alarm instruments used in work场所.
The standard was issued in 1990 and has undergone several revisions.
The new version is GB 12358-2024, which will be officially implemented on June 1, 2025.
This standard applies to the production and use of detection and alarm instruments for flammable gases, toxic and harmful gases, and oxygen in workplaces.

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

Gas Standard Material
We use gas standard substances of the same type as the gas measured by the instrument, such as methane, ethane, or gas standards can also use isopropanol, etc. If the instrument does not specify the type of gas being measured, the concentration of the gas at the alarm set point is approximately 60% of the full scale. The uncertainty of the expanded gas standard substance is not more than % (k-body standard substance greater than ±1%). The flow indication error of the repetitive dilution device should not be greater than 0.%. The concentration unit of the gas standard substance should be converted to match the unit of the instrument being tested when in use.

Regulatory contents and methods for periodic testing of flammable gas detectors
Annual inspections of industrial and commercial alarm sensors are conducted regularly, primarily checking for the accuracy, repeatability, drift, and response time of the alarms to ensure they meet standards. Additionally, the suitability of the alarm's installation location and any interference from other equipment are assessed.
Shenzhen Zhongnuo Testing Technology Co., Ltd. is a third-party institution specializing in electrical safety, electrical explosion-proofing, gas alarms, and toxic/hazardous gas alarm instruments for regular verification, measurement, and calibration services. We are qualified to address fire and explosion prevention issues for our clients.