Shenzhen Zhongnuo Inspection Technology Co., Ltd. specializes in the calibration, calibration, and metrological services of gas detectors, flammable gas detectors, and harmful gas detection instruments for various locations, providing national certification and services to address all types of electrical safety and explosion-proof fire prevention issues, promoting 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 clean, with a uniform paint and coating, free of peeling and rusting.
The instrument connection is reliable; all dials or buttons should operate and control normally.
Branding and Logos
Instrument name, model, manufacturer's name, manufacturing 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.

How often should various gas detectors be periodically calibrated and tested?
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.

Standard for verification and calibration of combustible and toxic gas detectors:
GB/T 50493-2019 "Design Standard for Detection and Alarm of Combustible and Toxic Gases in Petroleum and Chemical Industries"
GB12358-2006 General Technical Requirements for Environmental Gas Detection and Alarm Instruments in Workplaces
JJG693-2011 "Regulation for Calibration of Combustible Gas Detectors"

Regular inspection items for environmental gas detection and alarm equipment in work场所:
Alarm sound and light (if applicable)
2. Small response value
3. Indicating 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 Instruments)
7. Power Supply (for battery-powered instruments)
8. Response Time
9. Status Indicator (with wireless communication capability)
Shenzhen ZhongNuo Testing Technology Co., Ltd. is an independent third-party service provider specializing in electrical safety, electrical explosion-proofing, gas alarm systems, and toxic/hazardous gas detection instruments for regular inspections, calibration, and metrological services. We hold the necessary qualifications to assist clients in addressing fire and explosion prevention issues.