Shenzhen ZhongNuo Testing Technology Co., Ltd. specializes in the calibration, verification, and measurement services for gas alarms, combustible gas detectors, toxic and harmful gas detectors, and other equipment in various locations. We are licensed to serve nationwide, providing solutions for electrical safety and explosion-proof fire prevention issues, and contributing to safe production.
The calibration cycle for flammable gas detectors is typically once a year.
In accordance with the standard JJG 693-2011 "Flammable Gas Detectors," the calibration period for flammable gas detectors generally does not exceed one year. This means that, under normal circumstances, a comprehensive calibration and testing of the flammable gas detectors is required annually to ensure they meet the relevant performance standards.

Gaseous Alarm Detector Calibration: Conditions and Requirements
Environmental Conditions
Ambient Temperature: 0~40℃.
Relative Humidity: ≤85%
3. The working environment should not affect the normal operation of the instrument with electromagnetic fields and interfering gases.
Inspection Gauges and Instruments
1) Gas Standard Material
The relative expanded uncertainty of the gas standard material does not exceed 2% (k=2).
2) Standard Gas Dilution Device: Dilution error of 1%.
3) Stopwatch: Resolution not greater than 0.1s.
4) Flow Control: Flow range not less than 500 mL/min, flow grade not less than 4.
5) Zero Point Gas: Purified compressed air.
6) Pressure Reducing Valve: A pressure reducing valve that is compatible with the calibrated cylinder.
7) Gas Pipeline: Tube for gas pipelines, using materials like polytetrafluoroethylene or stainless steel that do not affect the concentration of the measured gas.

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)
④Standing proof or report (e.g., serial number), indicating page number and total number of pages on each page
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 names and codes;
Description of the traceability and validity of the measurement standards used for calibration.
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 approval from the laboratory.
Re-review interval
The recalibration period for instruments is typically one 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.

Standard for inspection and metrological calibration of flammable and toxic gas detectors:
Standard GB/T50493-2019 for Design of Detection and Alarm Systems for Combustible and Toxic Gases in Petroleum and Chemical Industry
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 specializes in electrical safety, electrical explosion-proof services, regular certification, metrological testing, and calibration for gas detectors and toxic/hazardous gas alarm instruments. We are qualified to assist customers in solving fire and explosion prevention issues.