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 at various locations. We are fully certified to serve nationwide, addressing clients' electrical safety and explosion-proof fire prevention needs, and contributing to safe production.
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)
④Standing proof or report (e.g., with serial number), and indicate each page and its number;
⑤Shipper's name and address
⑥ Describe and clearly identify the school target.
Calibration date and receipt date;
⑧ Technical specifications for calibration base, including names and codes;
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 of the person issuing the calibration certificate or calibration report, title or equivalent mark, and the date of issuance.
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, recalibration is required if there are doubts about the instrument's test data, or if the main components of the instrument are replaced, or after repairs.

Standard for calibration and verification of flammable and toxic gas detectors:
GB/T 50493-2019 "Standard for Design of Detection and Alarm Systems for Combustible Gases and Toxic Gases in Petroleum and Chemical Industries"
GB12358-2006 General Technical Requirements for Environmental Gas Detection and Alarm Instruments in Workplaces
JJG693-2011 "Code of Calibration for Flammable Gas Detectors"

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

Gas Standard Material
We 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 specify the type of gas being measured, the concentration of the gas at the set point (e.g., 60% of the full scale) is approximately the concentration of the standard substance. The uncertainty of the expanded gas standard substance is not significant (%). The flow value error of the repetitive dilution device should not be greater than 0.1% for gas standard substances with concentrations not exceeding the maximum. The concentration unit of the dilution device for gas standard substances should be converted to match the unit of the inspected instrument, and the discrepancy should not exceed 0.1%.
Shenzhen Zhongnuo Testing Technology Co., Ltd. is a third-party institution specializing in electrical safety, electrical explosion-proofing, gas alarms, and toxic and harmful gas alarm instruments for regular inspections, metrological measurements, and calibration services. We provide qualifications to help customers address fire and explosion prevention issues.