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, catering to various locations. We hold the necessary qualifications to serve nationwide, addressing clients' electrical safety and explosion-proof fire prevention concerns, and contributing to safe production.
Measurement Instrument Control
Instrument control includes calibration, follow-up calibration, and in-use inspection.

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

Regulatory Content and Methods for Regular Testing of Combustible Gas Detectors
Annually, we conduct annual inspections on the sensors of commercial and industrial alarm systems, primarily checking for the accuracy, repeatability, drift, and response time of the alarms to ensure they meet standards. Additionally, we verify the suitability of the alarm installation location and check for any interference from other equipment.

Verification Method
Appearance and structure
Inspect visually and by touch according to the requirements of Section 4.1.
Branding and Logos
Inspection to be conducted in accordance with requirement 4.2 by visual means.
Power-on inspection
Inspect visually and by touch, in accordance with the requirements of 4.3, to check the 5.3.4 alarm function and alarm action values.
Introduce a standard gas substance with a concentration greater than the alarm set point, causing the instrument to trigger an alarm. Observe whether the instrument's audio-visual alarm is functioning properly and record the instrument's reading at the time of alarm. Repeat the measurement three times, with the arithmetic mean of the three readings being the instrument's alarm action value.
Shenzhen Zhongnuo Testing Technology Co., Ltd. is a third-party institution specializing in electrical safety, electrical explosion-proofing, gas alarms, and toxic and harmful gas alarm instruments, providing regular inspections, metrological measurements, and calibration services. We are qualified to solve fire and explosion prevention issues for clients.