Shenzhen ZhongNuo Testing Technology Co., Ltd. specializes in the calibration, verification, and measurement services for gas alarms, flammable gas detectors, toxic and harmful gas detectors, and other equipment at various locations. We hold the necessary qualifications to serve nationwide, addressing clients' electrical safety and explosion-proof fire prevention issues, and contributing to safe production.
Appearance and structure
The instrument should not have any surface damage that affects its normal operation. The surface of newly manufactured instruments should be smooth and clean, with even paint and coating layers, free of peeling and rusting.
The instrument's connections are reliable, and all dials or buttons should operate and control normally.
Logos and Branding
Instrument name, model, manufacturer's name, manufacturing date, serial number, explosion-proof markings and numbers, as well as the manufacturing measurement instrument license mark and number for domestic instruments should be clear.

Power-on inspection
After power is applied to the instrument, it should operate normally with clear and complete display. Check the alarm function and alarm trigger values.
Alarm function and alarm action value verification
The instrument's sound and light alarm should be normal. Insulation resistance
Insulation resistance for instruments using AC power should be no less than 20MΩ.

What are the contents of 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.
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., numbered), with page numbers indicated on each page
5. Provide the sender's company name and address.
⑥ Describe and clearly define the target school;
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 mark, and issuance date of the certifier or report issuer for calibration certificates or reports;
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.
Two-proofing 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 questions about the instrument's test data, or if the main components of the instrument are replaced, as well as after repairs, a re-calibration is required.

How often should various gas detectors be calibrated and tested?
Instrument recalibration is typically every 1 year, determined by the sending unit based on actual usage. During the secondary calibration process, recalibrate the instrument if there are questions about the test data, or if the main components of the instrument are replaced, or after repairs where recalibration is required.
Shenzhen Zhongnuo Testing Technology Co., Ltd. is an independent third-party institution specializing in electrical safety, electrical explosion prevention, gas alarm systems, and toxic/hazardous gas alarm instruments for regular verification, measurement, and calibration services. We provide资质 to address fire and explosion prevention issues for our clients.