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 in various locations. We provide services nationwide, addressing various electrical safety and explosion-proof fire prevention issues for customers, and contributing to safe production.
The calibration cycle for flammable gas detectors is typically once a year.
In accordance with the standard JJG 693-2011 "Flammable Gas Detectors," 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 the flammable gas detector is required annually to ensure that its performance meets the relevant requirements.

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

Regulatory and Methodical Routine Inspection of Combustible Gas Detectors
Annual inspections are conducted on the sensors of commercial and industrial alarm systems, primarily checking for the accuracy, repeatability, drift, and response time of the alarms to ensure they meet standards. Additionally, the suitability of the alarm installation location and any interference from other equipment are assessed.

Routine 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-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 Function)
Shenzhen ZhongNuo Testing Technology Co., Ltd. is a third-party service provider specializing in electrical safety, electrical explosion-proofing, gas alarms, and toxic and harmful gas alarm instruments, offering regular calibration, measurement, and certification services. We hold the necessary qualifications to address fire and explosion prevention issues for our clients.