Shenzhen Zhongnuo Testing Technology Co., Ltd. specializes in the certification, calibration, and metrological services for equipment such as gas alarms, combustible gas detectors, and toxic and harmful gas detectors for various locations. We hold qualifications to serve nationwide, providing solutions to various electrical safety and explosion-proof fire prevention issues, and contributing to safe production.
Power-on inspection
The instrument should operate normally after being powered on, with clear and complete display sections. Check the alarm function and the alarm trigger values.
Alarm function and alarm action value verification
The instrument's acoustic and visual alarms should be functioning normally. Insulation resistance.
Insulation resistance for equipment using AC power should not be less than 20MΩ.

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.
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), and indicate each page and its number;
⑤Shipper's name and address
⑥ Describe and clearly define the target school;
Calibration date and receipt date;
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, title, or equivalent symbol of the issuer of the calibration certificate or calibration 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, as well as after repairs, a recalibration is required.

How often should various gas detectors be periodically calibrated and tested?
The recalibration period for instruments is typically one year, which is determined by the sending unit based on actual usage. During the re-calibration process, if there are questions about the instrument's test data, or if the main components of the instrument are replaced, as well as after repairs, recalibration is required.

Standard for verification and calibration of combustible and toxic gas detectors:
GB/T 50493-2019 "Design Standard for Detection and Alarm of Combustible and Toxic Gases in Petroleum and Chemical Industries"
GB12358-2006 General Technical Requirements for Environmental Gas Detection and Alarm Instruments in Workplace
JJG693-2011 "Regulation for Calibration of Combustible Gas Detectors"
Shenzhen Zhongnuo Testing Technology Co., Ltd. is a third-party institution that provides regular calibration, measurement, and certification services for electrical safety, electrical explosion-proofing, gas alarms, and toxic/hazardous gas detection instruments. We hold the necessary qualifications to assist clients in solving fire and explosion prevention issues.