Shenzhen ZhongNuo Testing Technology Co., Ltd. specializes in the calibration, verification, and measurement services for gas alarms, flammable gas detectors, toxic gas detectors, and other equipment at various sites. We hold qualifications to serve nationwide, addressing all sorts of electrical safety and explosion-proof fire prevention issues for customers, and contributing to safe production.
What does a calibration report for a combustible gas detector typically include?
The verification results should be reflected on 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 Standing proof or report (e.g., numbered), with each page and the total number indicated
⑤Shipper's name and address
⑥ Describe and clearly identify the target school.
Calibration Date and Receipt Date;
⑧ Technical specifications for calibration base, including name and code;
Description of traceability and validity 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 verification 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 re-calibration process, if there are any doubts about the instrument's test data, or if the main components of the instrument are replaced, as well as after repairs, recalibration is required.

Regulatory Content and Methods for Regular Testing of Flammable Gas Detectors
Annually, we conduct annual inspections on the sensors of commercial and industrial alarm systems, primarily checking for measurement errors, repeatability, drift, and response times to ensure they meet standards. Additionally, we verify the suitability of the alarm system's installation location and whether it is affected by interference from other equipment.

The detection principle of the instruments mainly includes catalytic combustion, infrared absorption, and thermal conductivity types. The sampling methods are diffusion and aspiration. The instruments are primarily composed of detection elements, amplification circuits, alarm systems, and displays, used for monitoring the concentration of combustible gases in the environment.

Verification Method
Appearance and structure
Inspect visually and by touch according to the requirements of section 4.1
Logos and Branding
Conform to the 4.2 requirements as observed visually.
Power-on inspection
Inspect visually and by touch, in accordance with 4.3 requirements, to check the 5.3.4 alarm function and alarm action values.
Introduce a standard substance with a gas concentration exceeding the alarm set point, causing the instrument to trigger an alarm. Observe whether the instrument's sound and light alarm function normally and record the instrument's reading at the time of alarm. Repeat the measurement three times, with the arithmetic mean of the three readings being the instrument's alarm trigger value.
Shenzhen Zhongnuo Inspection Technology Co., Ltd. is a third-party institution providing regular verification, calibration, and metrological services for electrical safety, electrical explosion-proof equipment, gas detectors, and toxic and harmful gas alarm instruments. We hold the necessary qualifications to assist clients in addressing fire and explosion prevention issues.