The daily cleaning of gas detectors directly affects the sensitivity, detection accuracy, and equipment lifespan of the sensors. The core principles are to avoid damaging the sensors, not affecting the smoothness of the gas path, and to prevent electrical components from getting damp. The following are specific precautions, classified by cleaning area and operation process, taking into account practicality and safety:
1、 Preparation must be made before cleaning (safety first)
Power off/shutdown operation: Before cleaning, be sure to turn off the instrument power. If it is a portable device, remove the battery to avoid triggering alarms or short circuits during the cleaning process.
Stay away from hazardous environments: Do not clean in areas with excessive concentrations of flammable, explosive, or toxic gases to prevent static electricity or sparks from causing danger during cleaning.
Prepare specialized tools: It is recommended to use a soft bristled brush (without shedding hair), a lint free cloth, compressed air (dry and oil-free), isopropanol (70% -90%, only for specific areas), and avoid using sharp tools or corrosive cleaning agents.
2、 Precautions for cleaning different parts
（1） Air inlet/sampling pipeline (core: anti blocking, anti pollution)
Cleaning frequency: Adjust according to the usage environment, clean daily in scenes with high dust and oil fumes (such as workshops and construction sites), and 1-2 times a week in ordinary environments.
Cleaning method:
Gently brush off dust and particles on the surface of the air inlet filter with a soft bristled brush, avoiding forcefully pressing the filter (which can damage the filter membrane);
If the filter screen has oil stains or stubborn stains, it can be removed and rinsed with clean water (only water washed filters are supported), dried, and then reinstalled. It is forbidden to soak it in detergent or alcohol;
Sampling pipelines (such as rubber or metal pipes) can be cleaned by blowing compressed air from one end to remove internal dust, and then wiping the outer wall with a clean cloth to avoid bending or blockage of the pipeline.
Taboo:
Do not dismantle the waterproof/dustproof components of the air intake without authorization to prevent damage to the sealing performance;
Do not spray liquid cleaner onto the air inlet to prevent liquid from entering the sensor chamber and causing damage to the sensor.
（2） Sensor probe (core: anti damage, anti moisture)
Cleaning principle: Sensors are core components (such as electrochemical, catalytic combustion, infrared sensors), and cleaning should be extremely gentle to avoid direct contact with sensing elements.
Cleaning method:
If there is slight dust on the surface of the probe, gently sweep it away with a dry soft bristled brush, or use compressed air (pressure ≤ 0.3MPa) to blow diagonally from the side (to avoid direct blowing causing dust to enter the interior of the sensor);
If the probe has oil stains (such as catalytic combustion sensors), you can gently wipe the probe housing with a cotton swab dipped in a small amount of isopropanol (70%). Do not let alcohol come into contact with the sensing element itself, and after cleaning, let it stand for more than 30 minutes until the alcohol has completely evaporated before turning on the device.
Taboo:
Do not use water, detergent, strong acid or alkali cleaning agents to contact the sensor;
Do not touch the sensor probe with your fingers (sweat and oil stains on your hands can contaminate the sensing element, leading to a decrease in sensitivity);
Electrochemical sensors should not be exposed to high humidity environments for long periods of time, and the probe should be kept dry after cleaning.
（3） Instrument casing/display screen (core: scratch resistant, water resistant)
Cleaning method:
Shell: Wipe with a slightly damp non fiber cloth (wring dry until no dripping), dipped in a small amount of neutral cleaner (such as detergent diluent), and avoid using organic solvents such as alcohol and acetone (which can corrode the shell coating);
Display screen: Gently wipe with a dedicated screen wiping cloth. If there are fingerprints or stains, dip in a very small amount of water or screen cleaner. Do not directly spray liquid on the screen (to avoid liquid infiltration into the body).
Taboo:
Do not use rough cloths, tissues, or sharp tools (such as nails or toothpicks) to wipe the screen to prevent scratches;
Avoid water or cleaning agents from entering the key gaps, interfaces, or charging ports of the instrument. After cleaning, check whether these parts are dry.
（4） Button/Interface (Core: Anti short circuit, Anti oxidation)
Cleaning method:
Use a soft bristled brush to sweep out the dust in the gaps between the buttons, or gently blow it away with compressed air. If there is oil stains, dip a small amount of isopropanol cotton swab and gently wipe the surface of the buttons;
Wipe the interfaces (such as USB, charging port, data interface) with a dry cotton swab to remove dust or oxide layer and avoid contact with liquids.
Taboo:
Do not spray liquid into the gaps or interfaces of the buttons;
Do not use metal tools to clean the interface to prevent scratching the contacts and poor contact.
3、 Cleaning inspection and finishing
Drying confirmation: After cleaning, it is necessary to ensure that all parts of the instrument are completely dry (especially the sensors, interfaces, and air intakes), to avoid short circuits or sensor damage caused by starting with water. In humid environments, it can be left to stand for 1-2 hours before starting.
Assembly reset: If the filter screen, sampling pipeline and other components are disassembled, they should be installed correctly in their original positions to ensure good sealing (such as the filter screen being installed in place and the pipeline being tightly connected), and to prevent air leakage during testing from affecting data accuracy.
Functional testing: Perform zero calibration and standard gas testing after power on to confirm that the instrument's response speed, alarm function, and data stability are normal. If any abnormalities occur, they should be promptly investigated (such as sensor contamination or gas path blockage).
Record archiving: Record the cleaning date, cleaning area, cleaning agent used, and post cleaning test results for easy traceability and maintenance cycle adjustment.
4、 Common Misconceptions Reminder
❶ Rinse the instrument with a high-pressure water gun or a large amount of water (absolutely prohibited, as it may cause sensor failure and circuit short circuit);
Clean the sensor or intake port with organic solvents such as alcohol and gasoline (which can corrode the sensing element and damage the filter membrane);
Unauthorized disassembly of sensors or internal structures of instruments during cleaning (disassembly by non professionals can easily cause component damage and affect warranty);
Immediately use in a high humidity or high concentration gas environment after cleaning (ventilation and drying are required before normal testing).