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, serving various locations nationwide. We provide solutions for electrical safety and explosion-proof fire prevention issues, contributing to safe production.
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 and alarm instruments used in work场所.
The standard was released 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 detection and alarm instruments for flammable gases, toxic and harmful gases, and oxygen in work places.

What are the contents of the report for calibration of combustible gas detectors?
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)
④ Standing proof or report (e.g., numbered), with indication of each page and page number;
⑤Shipper's name and address;
⑥ Clearly describe and identify the target school.
Date of calibration and receipt;
⑧ Technical specifications for calibration foundation, including name and code;
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 of the certifier or issuer of the calibration certificate or report, position or equivalent mark, and date of issuance;
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 recalibration is needed after repairs.

Instrument Calibration Control
Instrument control includes calibration, subsequent calibration, and in-service inspection.

Which gas detectors require regular calibration and metrological verification?
All types of in-use fixed, handheld, and portable gas detectors, gas alarms, toxic and harmful gas detectors/alarm systems, flammable gas detectors with alarms, gas analyzers, etc.
Shenzhen ZhongNuo Testing Technology Co., Ltd. is a third-party institution specializing in electrical safety, electrical explosion-proofing, gas alarm systems, and toxic/hazardous gas detection instruments. We offer regular verification, measurement, and calibration services, and are qualified to address fire and explosion prevention issues for our clients.