Shenzhen Zhongnuo Testing Technology Co., Ltd. specializes in the calibration, certification, and metrological services for gas alarms, combustible gas detectors, toxic and harmful gas detectors, and other equipment in various locations. We provide services nationwide, addressing electrical safety and explosion-proof fire prevention issues for clients, and contributing to safe production.
Which gas detectors require regular calibration and verification?
Fixed-installed, handheld, and portable gas detectors, gas alarm instruments, toxic and harmful gas detectors/alarm, flammable gas detectors/alarm, gas analyzers, etc.

Regular Calibration Content for Gas Detectors
Installation spacing of inspection (probe) points
2. Installation Height of the Detector
3. Indicated Error (Concentration)
Repeatability (Concentration)
5. Alarm Error (Concentration)
6. Response Time (Seconds)

Gas Standard Material
The standard gas should use gas standard substances of the same type as the gas measured by the instrument, such as methane or ethane, or gas standards can also use isopropanol, etc. If the instrument does not indicate the type of gas being measured, the concentration of the gas, such as methane, ethane, or alarm set points, is approximately 60% of the full scale. The uncertainty of the expanded gas standard substance is not significant (%), and the standard gas should be diluted using a dilution device with an error not greater than 0.%. The concentration unit of the dilution device should be converted to match the unit of the instrument being tested, and the error should not be greater than 0.%.

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. 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., with serial number), indicating each page and page number;
5. Send the company name and address.
⑥ Describe and clearly identify the school target.
Calibration Date and Receipt Date
⑧ Technical specifications for calibration base, including name and code;
Description of traceability and effectiveness of the measurement standards used in our 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 approval from the laboratory.
Re-review time interval
Instrument recalibration is typically every 1 year, determined by the submitting 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, or if recalibration is required after repairs.
Shenzhen Zhongnuo Testing Technology Co., Ltd. is a third-party institution specializing in electrical safety, electrical explosion prevention, gas alarms, and toxic and harmful gas alarm instruments, offering regular inspections, metrological measurements, and calibration services. We are qualified to address fire and explosion prevention issues for our clients.