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 for various locations. We serve nationwide, providing solutions to electrical safety and explosion-proof fire prevention issues for customers, and contributing to safe production.
What types of gas detectors require regular calibration and verification?
Fixed installation, handheld, portable gas detectors, gas alarm instruments, toxic and harmful gas detectors/alarm systems, flammable gas detectors/alarm systems, gas analyzers, etc.

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

What does a calibration report for a combustible gas detector typically include?
The verification results should be reflected in the verification certificate or report. The verification proof or report must include the following information.
① Title, such as "Calibration Certificate" or "Calibration Report";
② Laboratory Name and Address
③ Calibration Location (if not calibrated in the laboratory)
④ Standing proof or report (e.g., numbered), indicating page number and total pages on each page
5. Send the company name and address.
⑥ Describe and clearly define the target school;
Calibration Date and Receipt Date
⑧ Technical specifications for calibration foundation, including names and codes;
Description of the traceability and effectiveness of the measurement standards used in our calibration.
⑩ Description of Calibration Environment
11. Calibration Results and Measurement Uncertainty Statement
12. Signature, title or equivalent symbol, and issuance date of the certifier or issuer of the calibration certificate or calibration report.
13. Calibration results are only applicable to the calibration object.
14. No part of the certificate or report may be copied without written consent from the laboratory.
Re-review interval
Instrument recalibration is typically every 1 year, determined by the sending 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.

The calibration cycle for flammable gas detectors is typically once a year.
According to the provisions of the standard JJG 693-2011 "Flammable Gas Detector Alarms," the calibration period for flammable gas alarms generally does not exceed one year. This means that under normal circumstances, a comprehensive calibration and test of the flammable gas alarm should be conducted annually to ensure that its performance meets the relevant requirements.
Shenzhen Zhongnuo Testing Technology Co., Ltd. is an independent third-party service provider specializing in electrical safety, electrical explosion-proofing, gas alarms, and toxic gas detection instruments. We offer regular inspections, metrological services, and calibration. Our qualifications are dedicated to solving fire and explosion prevention issues for our clients.