Shenzhen ZhongNuo Inspection Technology Co., Ltd. specializes in calibration, certification, and metrological services for gas alarms, flammable gas detectors, and toxic gas detectors in various locations, offering solutions for electrical safety and explosion-proof fire prevention issues nationwide to support safe production.
Which gas detectors require regular calibration and verification?
Fixed-install, handheld, and portable gas detectors, gas alarm instruments, toxic and harmful gas detectors/alarm systems, flammable gas detectors with alarms, gas detection meters, etc.

GB 12358-2024 "General Technical Requirements for Environmental Gas Detection and Alarm Instruments in Workplace" is an important standard.
Intended to standardize the performance, functions, and testing methods of environmental gas detection alarm instruments used in work场所.
The standard was issued in 1990 and has undergone several revisions.
The new version is GB 12358-2024, which will be officially implemented on June 1, 2025.
This standard applies to the production and use of gas detection and alarm instruments for flammable gases, toxic and harmful gases, and oxygen in workplaces.

Measurement Instrument Control
Instrument control includes calibration, follow-up calibration, and in-service inspection.

What does a calibration report for a combustible gas detector typically include?
The verification results should be reflected in the verification certificate or report, and the verification proof or report must include the following information.
① Calibration Certificate or Calibration Report
② Laboratory Name and Address
③ Calibration Location (if not calibrated in the laboratory)
④Standing proof or report (e.g., numbered), with indication of each page and page number;
⑤Shipper's name and address
⑥ Describe and clearly define the school's target audience.
Calibration Date and Receipt Date
⑧ Technical specifications for calibration basis, including names and codes;
Description of traceability and effectiveness of the measurement standards used for calibration.
⑩ Description of Calibration Environment
11. Calibration Results and Measurement Uncertainty Statement
12. Signature, title, or equivalent symbol of the certifier issuing the calibration certificate or report, and the issuance date.
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 submitting unit based on actual usage. During the secondary calibration process, if there are doubts about the instrument's test data, or if the main components of the instrument are replaced, or if the instrument needs to be recalibrated after repair.
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 detection instruments for regular calibration, measurement, and certification services. We are qualified to solve fire and explosion prevention issues for our clients.