Zhejiang Gas Detector Calibration Consulting, ZN Testing

Shenzhen Zhongnuo Testing Technology Co., Ltd. specializes in the calibration, certification, and metrological services for gas detectors, flammable gas detectors, and harmful gas detectors for various locations. We serve nationwide, providing solutions to electrical safety and explosion-proof fire prevention issues for clients, promoting safe production.
The calibration cycle for flammable gas detectors is typically once a year.
According to the standard JJG 693-2011 "Flammable Gas Detector and Alarm," the calibration cycle for flammable gas detectors generally does not exceed one year. This means that under normal circumstances, a comprehensive calibration and test of flammable gas detectors should be conducted annually to ensure that their performance meets the relevant requirements.

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 with alarms, gas analyzers, etc.

Regular Inspection Items for Environmental Gas Detection and Alarm Equipment in Workplaces:
1. 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-suction instrument gas sampling distance and flow rate (for pump-suction instrument)
7. Power Supply (for battery-powered instruments)
8. Response Time
9. Status Indicator (with wireless communication function)

GB 12358-2024 "General Technical Requirements for Environmental Gas Detection and Alarm Instruments in Workplaces" is an important standard.
Intended to standardize the performance, functions, and testing methods of environmental gas detection and alarm instruments used in work sites.
The standard was issued in 1990 and has undergone several revisions.
The new version is GB 12358—2024, which will be officially implemented on June 1, 2025.
This standard applies to the production and use of gas detection and alarm instruments for flammable gases, toxic and harmful gases, and oxygen in work places.
Shenzhen Zhongnuo Testing Technology Co., Ltd. is a third-party institution specializing in electrical safety, electrical explosion-proofing, gas alarm systems, and toxic and harmful gas alarm instruments for regular inspections, metrological measurements, and calibration services. We are qualified to address fire and explosion prevention issues for our clients.