Shenzhen ZhongNuo Testing Technology Co., Ltd. specializes in the calibration, certification, and metrological services for gas alarms, combustible gas detectors, toxic and harmful gas detectors, and other equipment. We serve nationwide, providing solutions for various electrical safety and explosion-proof fire prevention issues, and contributing to safe production.
The instrument's detection principle primarily 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.

Verification Method
Appearance and structure
Inspect visually and by touch according to the requirements of Section 4.1
Branding and Logos
Inspect in accordance with the requirements of 4.2.
Power-on inspection
Inspect visually and by touch in accordance with 4.3 requirements to check the 5.3.4 alarm function and alarm action values.
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 alarms are functioning properly, and record the readings at the time of the alarm. Repeat the measurement three times, and the arithmetic mean of the three readings is the instrument's alarm activation value.

Routine inspection items for environmental gas detection and alarm instruments in workplace operations:
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-actuated instrument gas collection distance and flow rate (for pump-actuated instruments)
7. Power Supply (for battery-powered instruments)
8. Response Time
9. Status Indicator (with Wireless Communication Function)

Regulatory Inspection Content for Gas Detectors
Installation spacing of inspection (detection) points
2. Installation Height of the Detector
3. Indicated Error (Concentration)
Repetitive (Concentration)
5. Alarm Error (Concentration)
6. Response Time (Seconds)
Shenzhen ZhongNuo Testing Technology Co., Ltd. is a third-party service provider specializing in electrical safety, electrical explosion-proofing, gas alarms, and toxic and harmful gas detection instruments for regular verification, measurement, and calibration. We are qualified to address fire and explosion prevention issues for our clients.