Shenzhen Zhongnuo Testing Technology Co., Ltd. specializes in the calibration, verification, and measurement services for gas alarms, flammable gas detectors, toxic and harmful gas detectors, and other equipment in various locations. We hold qualifications to serve nationwide, providing solutions for electrical safety and explosion-proof fire prevention issues, and contributing to safe production.
What factors can affect the calibration cycle of flammable gas detectors?
Manufacturer Requirement: Flammable gas detectors from different manufacturers may have varying inspection cycle requirements. Therefore, when purchasing equipment, it's important to carefully review the product manual to understand the specific requirements of the manufacturer.
Equipment Usage Environment: The operating environment of the alarm directly affects its inspection cycle. If the equipment is continuously exposed to high concentrations of harmful gases, high humidity, or extreme temperatures (either high or low), the inspection cycle may be accordingly shortened.
‌Equipment Maintenance Status: The condition of equipment maintenance is also a significant factor affecting the inspection cycle. If the equipment faces issues like battery depletion or sensor aging over a long period, the inspection cycle will accordingly be shortened.

Which gas detectors require regular calibration and verification?
All types of in-use fixed installation, handheld, portable gas detectors, gas alarm instruments, toxic and harmful gas detectors/alarm systems, flammable gas detectors with alarms, gas analyzers, etc.

The principle of instrument detection mainly includes catalytic combustion, infrared absorption, and thermal conductivity types. Sampling methods include diffusion and aspiration. The instrument is mainly composed of detection elements, amplification circuits, alarm systems, and displays, used for monitoring the concentration of combustible gases in the environment.

Verification Method
Appearance and structure
Inspect visually and by touch in accordance with the requirements of Section 4.1.
Logos and Branding
Inspect in accordance with the requirements of Section 4.2.
Power-on inspection
Inspect visually and by touch in accordance with 4.3 requirements to check the 5.3.4 alarm function and alarm action values.
Introduce a standard substance with a gas concentration exceeding the alarm set point, causing the instrument to trigger an alarm. Observe whether the instrument's sound and light alarms are functioning normally and record the instrument's reading at the time of the alarm. Repeat the measurement three times; the arithmetic mean of the three readings is the instrument's alarm trigger value.
Shenzhen ZhongNuo Testing Technology Co., Ltd. is an independent third-party institution offering services such as regular inspections, metrology, and calibration for electrical safety, electrical explosion-proof, gas alarms, and toxic/hazardous gas detection instruments, providing资质 to clients for fire and explosion prevention solutions.