Shenzhen Zhongnuo Testing Technology Co., Ltd. specializes in the calibration, certification, and metrological services for gas alarms, combustible gas detectors, toxic and harmful gas detectors, and other equipment at various locations. We offer services nationwide, addressing clients' electrical safety and explosion-proof fire prevention needs, and contributing to safe production.
Measurement Equipment Control
Instrument control includes calibration, follow-up calibration, and in-service inspection.

Gas Standard Material
We use gas standard substances of the same type as the measured gas by the instrument, such as methane or ethane, or other gases can be used as standards, like isopropanol. If the instrument does not specify the type of gas being measured, the concentration of the gas at the set point for methane, ethane, or other gases should be approximately 60% of the full scale. The uncertainty of the expanded gas standard substance should not be more than % (the expanded uncertainty of the gas standard substance should be greater than ±1%). The flow indication error of the repetitive dilution device should not be higher than the concentration of the gas standard substance. The concentration unit of the gas standard substance should be converted to match the indicating unit of the inspected instrument when in use. The indication error should not be greater than 0.%.

Routine Inspection Items for Environmental Gas Detection and Alarm Equipment in Workplaces:
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-actuated Instrument Gas Sampling Distance and Flow Rate (for Pump-actuated Instruments)
7. Power Supply (for battery-powered instruments)
8. Response Time
9. Status Indicator (with wireless communication capability)

How often should various gas detectors be calibrated and tested?
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, or if recalibration is required after repair.
Shenzhen Zhongnuo Testing Technology Co., Ltd. is a third-party institution specializing in electrical safety, electrical explosion-proofing, gas alarm systems, and toxic/hazardous gas detection equipment for regular inspections, metrological measurements, and calibrations. We hold the necessary qualifications to address fire and explosion prevention issues for our clients.