Shenzhen ZhongNuo Testing Technology Co., Ltd. specializes in the calibration, certification, and metrological services for gas detectors, combustible gas detectors, and toxic gas detection instruments in various locations. We provide nationwide services, addressing electrical safety and explosion-proof fire prevention issues for clients, and contributing to safe production.
Instrument Calibration Control
Instrument control includes calibration, follow-up calibration, and in-use inspection.

How often should various gas detectors be calibrated and tested?
Instrument recalibration is typically every 1 year, determined by the submitting unit based on actual usage. During the secondary calibration process, if there are any doubts about the instrument's test data, or if the main components of the instrument are replaced, as well as after repairs, recalibration is required.

Regulatory Contents and Methods for Regular Detection of Combustible Gas Detectors
Annual inspections of industrial and commercial alarm sensors are conducted regularly, primarily to check for the accuracy of the alarm readings, repeatability, drift, and response time to ensure they meet standards. Additionally, the suitability of the alarm's installation location and any interference from other equipment are assessed.

Calibration Method
Appearance and structure
Inspect and feel in accordance with requirements of section 4.1.
Branding and Logos
Inspect as per requirement 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 alarm functions normally and record the instrument's reading when the alarm is triggered. 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 service provider specializing in electrical safety, electrical explosion-proofing, gas alarms, and toxic and harmful gas detection instruments for regular calibration, measurement, and certification. We are qualified to help customers solve fire and explosion prevention issues.