1、 Preparation before operation: Ensure that the sensor is compatible with the detection environment

1. parameter calibration
   • periodic calibrationAccording to the frequency of use and detection accuracy requirements, calibrate with standard gases (such as CO, NO ₂ and other target gases) every 3-6 months or as specified in the manual to ensure accurate range and zero point.
   • Environmental compensationIf the sensor is used in scenarios with large temperature/humidity changes (such as outdoor monitoring), it is necessary to enable environmental compensation function or manually input environmental parameters to reduce the interference of temperature and humidity on the detection results.
   • warm-up timePreheat for 10-30 minutes after power on (refer to the instruction manual for specific time), wait for the sensor output to stabilize before starting the detection.
2. Environmental condition inspection
   • temperature rangeEnsure that the temperature of the detection environment is within the working range of the sensor (usually -20 ℃~+50 ℃), to avoid sensor aging caused by high temperatures or slow response caused by low temperatures.
   • humidity controlRelative humidity ≤ 85%, to prevent condensation from damaging circuits or corroding sensor components.
   • Gas compatibilityConfirm that the detected gas is compatible with the sensor material (e.g. electrochemical sensors may be corroded by sulfides, chlorine gas, etc.) to avoid cross sensitivity or poisoning.
3. Equipment connection and power supply
   • Correct wiringConnect the signal and power lines according to the instructions to avoid short circuits or reverse connections (such as distinguishing A/B lines for RS485 communication).
   • Stable power supplyUse a regulated power supply to avoid voltage fluctuations exceeding ± 5% and prevent sensor damage or data fluctuations.
   • Anti static measuresWhen operating in a dry environment, wear an anti-static wristband to prevent static electricity from penetrating the sensor chip.

2、 Standard operation: Ensure detection accuracy and safety

1. Sampling and installation
   • Sampling PositionInstall the sensor in a location with smooth and unobstructed gas flow (such as near the center of the pipeline or ventilation opening) to avoid blind spots that may cause detection lag.
   • Installation directionAccording to the sensor design requirements (such as diffusion or pump suction), ensure that the air inlet faces the direction of the gas source.
   • Anti interference designStay away from strong electromagnetic sources (such as frequency converters, high-voltage lines) and vibration sources to prevent signal interference or mechanical damage.
2. Real time monitoring and recording
   • Data stabilityObserve whether the sensor output is stable. If the reading fluctuates by more than ± 5%, check for environmental interference or sensor malfunction.
   • Alarm threshold settingSet reasonable alarm thresholds according to safety standards (such as triggering alarms when CO concentration exceeds 24ppm), and regularly test the alarm function.
   • log recordingRecord detection time, gas concentration, environmental parameters, and other data for easy traceability and analysis of abnormal situations.
3. Safety protection measures
   • personal protectionWhen detecting toxic gases (such as H ₂ S, Cl ₂), wear a gas mask, gloves, and goggles to prevent inhalation or skin contact.
   • Ventilation requirementsWhen conducting inspections in confined spaces, ensure continuous ventilation to avoid the risk of poisoning or explosion caused by gas accumulation.
   • emergency responseEquipped with gas leak emergency plan, if high concentration flammable gas (such as CH ₄) is detected, immediately cut off the power and evacuate the scene.

3、 Post operation maintenance: Extend sensor lifespan

1. Cleaning and Storage
   • Clean the surface of the sensorWipe the air inlet and housing with a soft cloth to prevent dust or oil from clogging the air holes.
   • Dustproof and moisture-proof storageWhen not in use for a long time, place the sensor in a moisture-proof box and place a desiccant to keep the environment dry.
   • Avoid mechanical impactHandle with care during transportation or storage to prevent the internal components of the sensor from becoming loose or damaged.
2. Sensor protection
   • Anti poisoning measuresAfter detecting corrosive gases (such as NH3, SO ₂), rinse the sensor with clean air in a timely manner to reduce the corrosion of residual gases on the components.
   • Lifecycle ManagementThe lifespan of electrochemical sensors is usually 2-3 years, and they need to be replaced in advance when approaching the end of their lifespan to avoid detection failure.
   • Backup sensorIt is recommended to equip backup sensors for key application scenarios (such as chemical production) to ensure continuous operation of the equipment.
3. Battery and Power Management
   • Low battery alertIf the sensor has a built-in battery, it is necessary to regularly check the battery level to avoid data loss or detection interruption caused by low battery.
   • Long term storage and chargingIf not used for a long time, charge the battery every 3 months to prevent self discharge damage.
   • Power adapter matchingUse the original power adapter to avoid voltage instability caused by non-standard power sources.

4、 Special scenario precautions

1. High temperature environment detection
   • Cooling measuresWhen detecting in high-temperature environments (such as boiler rooms), the sensor temperature can be reduced by installing heat sinks or air cooling devices.
   • High temperature dedicated sensorIf the ambient temperature exceeds the normal range, use high-temperature resistant sensors (such as ceramic substrate sensors).
2. High humidity environment detection
   • waterproof designChoose sensors with protection levels of IP65 or higher to prevent moisture from infiltrating the circuit.
   • Humidity compensationEnable humidity compensation function or external humidity sensor to correct the impact of humidity on the detection results.
3. Multi gas mixture detection
   • Cross sensitivity testingWhen detecting mixed gases, confirm the cross sensitivity coefficient of the sensor to other gases through experiments to avoid misjudgment.
   • Multi sensor arrayFor complex gas components, a multi-sensor array (such as PID+electrochemical sensor combination) can be used to improve detection accuracy.

5、 Common Problems and Solutions