Hengaode Instrument Industrial Environment Multi in One Gas Detector‌Operation process and key steps‌

It is a portable or fixed device that can simultaneously detect the concentration of two or more gases. It is widely used in industrial safety, environmental monitoring, and other fields to monitor multiple gas risks in real time.‌

1 The operating principle mainly involves gas sensor technology, detection principle, signal processing, and calibration process.

‌Working principle and detection mechanism‌

The multi in one gas detector integrates multiple high-precision gas sensors internally, each sensor designed for a specific gas type. When the sensor is exposed to the gas being measured, its resistance or electrical signal changes, which are converted into recognizable electrical signals through internal circuits and displayed in real-time on the display screen as concentration values.‌

3 The core detection principle varies depending on the gas type:

‌Electrochemical sensor‌Mainly used for toxic gases such as carbon monoxide and hydrogen sulfide. Gas molecules enter the sensor through a breathable membrane and undergo oxidation-reduction reactions (such as carbon monoxide being oxidized to carbon dioxide), producing a weak current proportional to the concentration. The instrument converts the concentration based on the current intensity.‌

‌Catalytic combustion sensor‌Specially designed for combustible gases such as methane and propane. The sensor is heated to300-400℃Combustible gases undergo flameless combustion on their surfaces, causing changes in component resistance. The instrument calculates the concentration (based on the lower explosive limit) through the difference in resistanceLEL%Indicating).‌

‌infrared sensor‌Part of it is used for combustible gas detection, utilizing the absorption characteristics of gases towards specific wavelengths of infrared light, and calculating concentration through optical signal attenuation, which has the advantage of anti poisoning.‌

‌Original battery type sensor‌Used for oxygen detection. The sensor is similar to a micro fuel cell inside, where oxygen undergoes a reduction reaction at the cathode through a breathable membrane, generating a stable current. The magnitude of the current is proportional to the oxygen concentration (displayed as a volume percentage)VOL%）.‌

‌Operation process and key steps‌

‌Startup and initialization‌After startup, the instrument automatically performs a system self-test to ensure that the sensors and circuits are functioning properly.

‌real-time monitoring‌The sensor continuously samples the ambient gas, and after amplification and analog-to-digital conversion, the signal is processed by the processor to calculate the concentration value, which is dynamically updated through the display screen.‌

‌alarm function‌When the concentration of any gas exceeds a preset threshold (such as carbon monoxide)500ppmOxygen level below19.5%VOL）The instrument alarms through sound and light (sound intensity)≥110dB）Or vibrate to remind users.‌

‌Data recording and output‌Some models support data storage or wireless transmission for subsequent analysis.

‌Calibration and maintenance‌

To ensure detection accuracy, the instrument needs to be calibrated regularly:

‌zero point calibration‌Conducted in clean air, the instrument automatically collects zero reference values to eliminate drift.‌

‌Range calibration‌Use standard gas (such as carbon monoxide)50ppm）By calibrating the cover to regulate the flow rate into the sensor, the instrument compares the actual concentration with the standard value and adjusts the parameters.‌

After calibration, it is necessary to check the error range (such as zero offset)<±1%F.S）And verify accuracy through gas testing with known concentrations.‌

‌Typical application scenarios‌

The multi in one gas detector is suitable for limited space operations (such as sewage tanks, storage tanks), chemical workshops, oil and gas extraction, and other scenarios. It can simultaneously monitor multiple risks such as toxic gases, flammable gases, oxygen, etc., improving operational safety