Shenzhen Zhongnuo Testing Technology Co., Ltd. specializes in the calibration, verification, and measurement services for gas alarms, combustible gas detectors, and toxic gas detection instruments for various locations. We hold the necessary qualifications to serve nationwide, addressing clients' electrical safety and explosion-proof fire prevention needs, and contributing to safe production.
Regular Inspection Items for Environmental Gas Detection and Alarm Equipment in Workplace Operations:
1. Alarm sound and light (if applicable)
2. Low response value
3. Indicating Error (for Gas Detectors/Gas Detector Alarms)
4. Instrument Drift (in Portable Instruments)
5. Alarm Error (for Gas Detection Alarm/ Gas Alarm)
6. Pump-actuated Instrument Gas Sampling Distance and Flow Rate (for Pump-actuated Instruments)
7. Power Supply (for battery-powered instruments)
8. Response Time
9. Status Indicator (with Wireless Communication Function)

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 multiple 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 does a calibration report for a flammable gas detector 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 Title, such as "Calibration Certificate" or "Calibration Report";
② Laboratory Name and Address
③ Calibration Location (if not calibrated in the laboratory)
④ Standby Letter of Credit or Report (e.g., numbered), with indication of each page and page number;
5. Shipper's name and address
⑥ Describe the target school clearly and explicitly.
Calibration Date and Receipt Date
⑧ Technical specifications for calibration basis, 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, 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-proofreading interval
Instrument recalibration is typically every 1 year, determined by the sending unit based on actual usage. During the re-calibration process, if there are doubts about the instrument's test data, or if the main components of the instrument are replaced, as well as after repairs, a re-calibration is required.

Combustible Gas Detector Alarm Regular Inspection Content and Methods
Annual inspections of industrial and commercial alarm sensors are conducted regularly, primarily checking for the accuracy error, repeatability, drift, and response time of the alarms to ensure they meet standards. Additionally, the suitability of the alarm's installation location and any interference from other equipment are also assessed.
Shenzhen Zhongnuo Testing Technology Co., Ltd. is a third-party institution specializing in electrical safety, electrical explosion-proofing, gas alarm systems, and toxic and harmful gas alarm instruments for regular verification, measurement, and calibration services. We hold the necessary qualifications to assist clients in addressing fire and explosion prevention issues.