Shenzhen ZhongNuo Testing Technology Co., Ltd. specializes in the calibration, certification, and measurement services for equipment such as gas alarms, combustible gas detectors, and toxic gas analyzers for various locations. We offer nationwide services to address electrical safety and explosion-proof fire prevention issues for clients, contributing to safe production.
Which gas detectors require regular calibration and verification?
All types of in-use fixed installation, handheld, and portable gas detectors, gas alarms, toxic and harmful gas detectors/alarms, flammable gas detectors/alarms, gas analyzers, etc.

Appearance and structure
Instruments should not have any surface damage that affects their normal operation. The surface of newly manufactured instruments should be smooth and even, with a uniform paint coating and no signs of peeling or rust.
The instrument's connections are reliable, and all dials or buttons should operate and control normally.
Logos and Branding Marks
Instrument name, model, manufacturer, date of manufacture, serial number, explosion-proof marking and number, as well as the manufacturing metrological instrument license marking and number for domestic instruments should be clear.

Verification Method
Appearance and structure
Inspect and feel according to requirements of Section 4.1
Branding and logos
Inspect in accordance with the requirements of Section 4.2.
Power-on Inspection
Inspect visually and by touch according to the requirements of 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 properly 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.

How often should various gas detectors be periodically calibrated and checked?
Instrument recalibration is typically every 1 year, determined by the submitting unit based on actual usage. During the re-calibration process, if there are doubts about the instrument's test data, or if the main components of the instrument are replaced, or if recalibration is needed after repairs.
Shenzhen ZhongNuo Testing Technology Co., Ltd. is a third-party institution specializing in electrical safety, electrical explosion-proofing, gas alarms, and toxic gas detection equipment for regular inspections, metrological measurements, and calibration services. We hold the necessary qualifications to assist clients in addressing fire and explosion prevention issues.