Shenzhen ZhongNuo Testing Technology Co., Ltd. specializes in the calibration, verification, and measurement services of gas alarms, flammable gas detectors, toxic and harmful gas detectors, and other equipment for 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 appearance damage that affects its normal operation. The surface of newly manufactured instruments should be smooth and glossy, with a uniform paint and plating coating, 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
The instrument should operate normally after being powered on, with the display section being clear and complete. Check the alarm function and alarm trigger values.
Alarm function and alarm action value verification
The instrument's sound and light alarm should be functioning normally. Insulation resistance
Insulation resistance for instruments using AC power should not be less than 20MΩ.

What information is included in the calibration report for a combustible gas detector?
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 Standby letter of credit or report (e.g., numbered), with indication of each page and page number;
⑤Provide the name and address of the shipping entity;
⑥ Describe and clearly identify the school's target audience.
Calibration date and receipt date;
⑧ Technical specifications for calibration foundation, 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 Statements
12. Signature of the person issuing the calibration certificate or report, position or equivalent symbol, 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 the written consent of 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, 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.

How often should various gas detectors be periodically calibrated and checked?
The recalibration period for instruments is typically one year, determined by the submitting unit based on actual usage. During the secondary 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, a re-calibration is required.
Shenzhen ZhongNuo Testing Technology Co., Ltd. is a third-party institution specializing in electrical safety, electrical explosion-proof, gas alarm, and toxic gas detection equipment calibration, regular inspections, and metrological services. We are qualified to address fire and explosion prevention issues for our clients.