Shenzhen Zhongnuo Testing Technology Co., Ltd. specializes in the calibration, verification, and metrological services for equipment such as gas alarms, combustible gas detectors, and toxic/hazardous gas detectors for various locations. We hold the necessary qualifications to serve customers nationwide, addressing various electrical safety and explosion-proof fire prevention issues, and contributing to safe production.
Routine Inspection Items for Environmental Gas Detection and Alarm Equipment in 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 Detector/ Gas Alarm)
6. Pump-actuated instrument gas collection distance and flow rate (for pump-actuated instruments)
7. Power Supply (for battery-powered instruments)
8. Response Time
9. Status Indicator (with Wireless Communication Function)

Calibration Method
Appearance and structure
Inspect visually and by feel according to the requirements of Section 4.1
Logos and Branding
Inspect in accordance with requirement 4.2.
Power-on inspection
Inspect visually and by touch, as per 4.3 requirements, to check the 5.3.4 alarm function and alarm action values.
Introduce a standard substance of gas with a concentration exceeding the alarm set point, causing the instrument to trigger an alarm. Observe whether the instrument's sound and light alarm function properly and record the instrument's reading when the alarm is activated. Repeat the measurement three times; the arithmetic mean of the three readings is the instrument's alarm activation value.

Which gas detectors require regular calibration and verification?
Fixed installations, handheld, portable gas detectors, gas alarm instruments, toxic and harmful gas detectors/alarm systems, flammable gas detectors/alarm systems, gas analyzers, etc.

What are the contents included in the calibration report for flammable gas detectors?
The verification results should be reflected in the verification certificate or report. 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. Shipper's name and address
⑥ Describe and clearly identify the school target.
Calibration Date and Receipt Date
⑧ Technical specifications for calibration basis, including names and codes;
Description of 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 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.
Reprüfung intervals
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.
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 calibrations. We provide资质 services to address fire and explosion prevention issues for our clients.