Shenzhen ZhongNuo Testing Technology Co., Ltd. specializes in the calibration, certification, and measurement services for gas alarms, combustible gas detectors, toxic and harmful gas detectors, and other equipment in various locations. We offer 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-install, handheld, and portable gas detectors, gas alarm instruments, toxic and harmful gas detectors/alarm systems, flammable gas detectors/alarm systems, gas analyzers, etc.

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 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 page number;
⑤Shipper's name and address
⑥ Clearly describe and identify the school target audience;
Calibration date and receipt date;
⑧ Technical specifications for calibration base, including names and codes;
Description of the traceability and effectiveness of the measurement standards used in 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 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.
Two-time re-proofreading 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, if the main components of the instrument are replaced, or if recalibration is needed after repairs.

Standard for Verification and Calibration of Flammable and Toxic Gases Detectors:
GB/T50493-2019 "Standard 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 Workplaces
JJG 693-2011 "Regulation for Calibration of Combustible Gas Detectors"

Routine Inspection Items for Environmental Gas Detection and Alarm Equipment at Workplaces:
Alarm sound and light (if applicable)
2. Low response value
3. Indication Error (for Gas Detectors/Gas Detector Alarms)
4. Instrument Drift (in Portable Instruments)
5. Alarm Error (for Gas Detection Alarm/ Gas Alarm)
6. Pump-Draw Instrument Gas Sampling Distance and Flow Rate (for Pump-Draw Instruments)
7. Power Supply (for battery-powered instruments)
8. Response Time
9. Status Indicator (with Wireless Communication Function)
Shenzhen ZhongNuo Testing Technology Co., Ltd. is a third-party institution providing regular calibration, measurement, and certification services for electrical safety, electrical explosion-proof, gas detectors, and toxic and harmful gas alarm instruments. We have the qualifications to assist clients in solving fire and explosion prevention issues.