Shenzhen ZhongNuo Testing Technology Co., Ltd. specializes in the calibration, certification, and measurement services for equipment such as gas alarms, flammable gas detectors, and harmful gas detection instruments for various locations. We provide nationwide services to address electrical safety and explosion-proof fire prevention issues for clients, contributing to safe production.
Gas Alarm Meters Calibration Conditions and Requirements
Environmental Conditions
Ambient Temperature: 0~40℃.
2. Relative Humidity: ≤85%
3. The working environment should not affect the normal operation of the instrument with electromagnetic fields and interfering gases.
Inspection Gauges and Instruments
1) Standard Gas Substance
The relative expanded uncertainty of the gas standard material is not greater than 2% (k=2).
2) Standard Gas Dilution Unit: Dilution Error of 1%.
3) Stopwatch: Resolution not greater than 0.1s.
4) Flow Control: Flow range not less than 500 mL/min, flow grade not less than level 4.
5) Zero Point Gas: Purified compressed air.
6) Pressure Reducing Valve: A pressure reducing valve that is compatible with the calibrated cylinder.
7) Gas Pipeline: Use气管 made of materials like polytetrafluoroethylene or stainless steel that do not affect the concentration of the measured gas.

What does a calibration report for a flammable gas detector typically include?
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 page and total number of pages
⑤Shipper's name and address
⑥ Describe and clearly define the target school;
Calibration date and reception date;
⑧ Technical specifications for calibration foundation, including names and codes;
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 date of issue by the certifier or issuer of calibration certificates or calibration 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.
Re-proofreading 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 needed after repairs.

The calibration cycle for flammable gas detectors is typically once a year.
According to the standard JJG 693-2011 "Flammable Gas Detector Alarms," the calibration period for flammable gas alarms typically does not exceed 1 year. This means that under normal circumstances, a comprehensive calibration and test of the flammable gas alarm is required annually to ensure its performance meets the relevant requirements.

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 layer, 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, production date, serial number, explosion-proof marking and number, as well as the manufacturing metrological instrument license marking and number for domestic instruments should be clear.
Shenzhen Zhongnuo Testing Technology Co., Ltd. is a third-party institution that provides regular certification, metrological testing, and calibration services for electrical safety, electrical explosion-proofing, gas alarms, and toxic and harmful gas detection instruments. We hold the necessary qualifications to assist clients in solving fire and explosion prevention issues.