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.
Regular Inspection Items for Environmental Gas Detection and Alarm Equipment in Workplace Operations:
1. Alarm sound and light (if applicable)
2. Low response value
3. Indicating Error (for Gas Detectors/ Gas Detector Alarms)
4. Instrument Drift (in Portable Instruments)
5. Alarm Error (for Gas Detection Alarm / Gas Alarm)
6. Pump-suction instrument gas collection distance and flow rate (for pump-suction instruments)
7. Power Supply (for battery-powered instruments)
8. Response Time
9. Status Indicator (with Wireless Communication Function)

Regulatory contents and methods for periodic inspections of flammable gas detectors
Annual inspections are conducted on the sensors of commercial and industrial alarms, primarily checking for measurement errors, repeatability, drift, and response times to ensure they meet standards. Additionally, the installation location of the alarms is assessed for suitability and whether it is affected by interference from other equipment.

The principle of instrument detection mainly includes catalytic combustion, infrared absorption, and thermal conductivity types. Sampling methods include diffusion and aspiration. The instrument is mainly composed of detection elements, amplification circuits, alarm systems, and displays, used for monitoring the concentration of combustible gases in the environment.

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 and 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 gas detection and alarm instruments for flammable gases, toxic and harmful gases, and oxygen in workplace environments.
Shenzhen ZhongNuo Inspection Technology Co., Ltd. is a third-party institution specializing in electrical safety, electrical explosion-proofing, gas alarms, and toxic and harmful gas detection equipment for regular verification, measurement, and calibration services. We hold the necessary qualifications to assist clients in solving fire and explosion prevention issues.