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 at various locations. We hold the necessary qualifications to serve nationwide, providing solutions to electrical safety and explosion-proof fire prevention issues for our clients, and 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 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 workplace environments.

What are the contents included in the calibration report for flammable 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 Certificate or report (e.g., with serial number), indicating each page and page number.
5. Shipper's name and address
⑥ Describe and clearly identify the target school.
Calibration date and receipt date;
⑧ Technical specifications for calibration foundation, 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 issuer of 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 time interval
The recalibration period for instruments is typically one year, to be determined by the submitting 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, or if recalibration is needed after repairs.

Standard for certification and metrological calibration of combustible and toxic gas detectors:
GB/T 50493-2019 "Design Standard for Detection and Alarm of Combustible Gases and Toxic Gases in Petroleum and Chemical Industry"
GB12358-2006 General Technical Requirements for Environmental Gas Detection and Alarm Instruments in Workplace
JJG 693-2011 "Regulation for Calibration of Combustible Gas Detectors"

Gas Standard Material
We use gas standard substances of the same type as the gas measured by the instrument, such as methane, ethane, or other gases. If the instrument does not specify the type of gas being measured, the concentration of the gas with a 60% error range set point is approximately the full-scale standard substance. The expanded uncertainty of the standard gas generator can also be adopted, with the uncertainty not exceeding % (the uncertainty of the body standard substance is greater than ±1%). The flow value error of the repeatability dilution device should not be greater than 0.%. The concentration unit of the gas standard substance used should be converted into the unit of the measuring instrument being tested, and the discrepancy should not be greater than 0.%.
Shenzhen ZhongNuo Testing Technology Co., Ltd. is an independent third-party organization providing services such as regular certification, measurement, and calibration for electrical safety, explosion-proof electrical equipment, gas detectors, and toxic/hazardous gas alarm instruments. We are qualified to help clients address fire and explosion prevention issues.