1、 Daily inspection and cleaning

1. Visual inspection
   • Shell integrityCheck if there are cracks, deformations, or corrosion on the casing of the sampler, especially for equipment used outdoors for a long time. It is important to focus on checking if the rain cover and sealing strip are intact.
   • Connection partConfirm whether the connections of the sampling tube, power cord, sensor interface, etc. are loose or detached to avoid data abnormalities caused by poor contact.
2. Cleaning of intake system
   • Cleaning of sampling headUse a soft bristled brush or compressed air to remove dust, insects, or spider webs from sampling heads (such as filter cartridges and air intakes) to prevent blockages that affect flow rate.
   • Filter membrane replacementRegularly replace the filter membrane according to the degree of pollution in the sampling environment (such as every 24 hours or when the pollution is severe) to avoid filter membrane blockage leading to a decrease in flow rate. When replacing, it is necessary to record the filter membrane number and replacement time.
3. Traffic system inspection
   • flow calibrationRegularly calibrate the flow rate of the sampler using a standard flow meter (such as a soap film flow meter) to ensure that it meets the set value (such as 100L/min). If the flow deviation exceeds ± 5%, it needs to be adjusted or repaired.
   • Pump body maintenanceCheck whether the sampling pump (such as diaphragm pump, rotary vane pump) runs smoothly and whether there are any abnormal noises or vibrations. If the pump body heats up severely, it may be due to insufficient lubrication or component wear, and it needs to be dealt with in a timely manner.
4. Sensor and circuit inspection
   • Sensor statusCheck whether the temperature, humidity, pressure and other sensors display normally to avoid data distortion caused by sensor failure.
   • Circuit board cleaningBlow the dust off the circuit board with dry compressed air to prevent short circuits or poor contacts. Avoid using a damp cloth to wipe to prevent circuit corrosion.

2、 Regular maintenance and calibration

1. Deep maintenance of flow system
   • Pump body lubricationAdd specialized lubricating oil (such as silicone oil) to the piston, bearings, and other moving parts of diaphragm pumps or rotary vane pumps to reduce wear.
   • Flow meter cleaningIf using a glass rotor flowmeter, it is necessary to regularly disassemble and clean the rotor to avoid the accumulation of dirt that may affect accuracy.
   • calibration cycleIt is recommended to perform flow calibration every 3 months, and for high pollution environments or critical monitoring projects, it should be shortened to once a month.
2. Sensor calibration and replacement
   • Temperature/humidity sensorCompare and calibrate with a standard temperature and humidity meter. If the deviation exceeds ± 1 ℃ or ± 5% RH, it needs to be replaced.
   • pressure sensorCalibrate with a standard pressure gauge to ensure that the measurement error of air pressure is ≤ ± 1kPa.
   • gas sensorIf the sampler is equipped with gas sensors such as SO ₂ and NOx, it is necessary to perform zero/span calibration with standard gas (such as 1ppm SO ₂) regularly to avoid sensitivity degradation.
3. battery maintenance
   • Charging ManagementBefore long-term storage, the battery should be fully charged (to 80% -90%) to avoid excessive discharge and damage to the battery.
   • Battery replacementIf the battery life is significantly reduced (such as from 8 hours to 4 hours), a new battery (such as a lithium battery or lead-acid battery) needs to be replaced.

3、 Troubleshooting and Handling

1. abnormal traffic
   • phenomenonThe traffic display is 0 or far below the set value.
   • reasonFilter membrane blockage, bent sampling tube, pump body failure, and damaged flow meter.
   • processReplace the filter membrane, inspect and straighten the sampling tube, repair or replace the pump body, calibrate or replace the flow meter.
2. Data anomaly
   • phenomenonTemperature/humidity/pressure display errors or large fluctuations.
   • reasonSensor malfunction, poor circuit board contact, environmental interference (such as strong electromagnetic fields).
   • processCalibrate or replace sensors, check circuit connections, and stay away from interference sources.
3. Pump body malfunction
   • phenomenonThe pump operates with loud noise, severe heating, or cannot be started.
   • reasonInsufficient lubrication, component wear, and motor damage.
   • processAdd lubricating oil, replace worn parts (such as diaphragms and rotors), repair or replace the motor.
4. power failure
   • phenomenonThe instrument cannot be turned on or restarts frequently.
   • reasonLow battery level, damaged power adapter, short circuit on circuit board.
   • processCharge or replace the battery, replace the power adapter, check the circuit board and repair the short circuit point.

4、 Storage and transportation precautions

1. Long-term storage
   • Environmental RequirementsStore in a dry, ventilated, and dark environment, with temperature controlled between -10 ℃ and 40 ℃ and humidity ≤ 70%.
   • Dustproof and MoistureproofCover the instrument with a dust cover and place a desiccant (such as a silicone bag) inside the box to prevent the circuit from getting damp.
   • Battery ManagementIf not used for a long time, it is necessary to regularly (every 3 months) charge and maintain the battery to prevent over discharge.
2. transport protection
   • Shockproof packaging: Use a special transport box, filled with foam or air cushion, and fix all parts of the instrument to avoid damage caused by transport vibration.
   • Avoid inversionKeep the instrument upright during transportation to prevent liquid (such as coolant) leakage or component displacement.
   • environmental controlIf the transportation environment temperatureharsh(such as low temperature in winter or high temperature in summer), insulation or cooling measures need to be taken.