1、 Daily inspection and cleaning

1. Visual inspection
   • Shell and connectorsRegularly inspect the flowmeter casing for any damage, corrosion, or looseness to ensure good sealing and prevent medium leakage.
   • Display screen and indicator lightsObserve whether the display screen is clear, whether the indicator lights are on normally, and confirm that the device is in operation.
   • Installation environmentCheck for vibrations, strong magnetic fields, or high temperature sources around to avoid external interference affecting measurement accuracy.
2. Pipeline and filter cleaning
   • Filter cleaningAccording to the cleanliness of the medium, regularly clean or replace the filter (recommended every 1-3 months) to prevent particulate matter from blocking the impeller or bearing and causing poor rotation.
   • Pipeline inner wall inspectionUse an endoscope or professional tool to inspect the inner wall of the pipeline for scaling, corrosion, or deposits, and if necessary, perform cleaning or descaling treatment.
3. Impeller and bearing inspection
   • Flexibility of impeller rotationGently rotate the impeller to confirm that it rotates smoothly without any jamming or abnormal noise. If it is found that the rotation is not flexible, it may be due to bearing wear or medium adhesion, and further treatment is needed.
   • Bearing lubricationAccording to equipment requirements, regularly add lubricating oil to the bearings (usually 2-3 times a year) to reduce wear and extend their service life. If the medium is a high-temperature or corrosive liquid, a high-temperature and corrosion-resistant lubricant should be selected.

2、 Regular calibration and calibration

1. calibration cycle
   • It is recommended to perform professional calibration every 1-2 years based on usage frequency and medium characteristics. If the viscosity of the medium changes significantly or the usage environment is harsh, the calibration cycle needs to be shortened.
2. calibration method
   • Comparison of standard flow metersConnect the impeller flowmeter in series with the standard flowmeter, compare the readings under the same operating conditions, calculate the error, and adjust it.
   • Laboratory calibrationSend it to a professional metrology institution and use standard devices (such as volumetric method and mass method) for full range calibration to ensure that the measurement accuracy meets the requirements.
3. parameter adjustment
   • According to the calibration results, adjust the K coefficient (pulse equivalent) or linear correction parameter of the flowmeter to ensure that the output signal is consistent with the actual flow rate.

3、 Electrical and signal maintenance

1. Wiring inspection
   • Power and signal linesRegularly check whether the wiring terminals are loose or oxidized to ensure a secure connection. If poor contact is found, it is necessary to tighten or replace the wiring terminals.
   • Lightning protection and groundingConfirm that the grounding resistance of the equipment is less than 4 Ω to avoid damage to electronic components from lightning strikes or static electricity. Before the thunderstorm season, focus on checking the grounding system.
2. Signal output test
   • pulse signalTest the pulse output signal with an oscilloscope or frequency meter to confirm that the frequency is proportional to the flow rate and there is no loss of pulses or interference.
   • Analog signal (4-20mA)Measure the current output with a multimeter to confirm that it corresponds to the flow value and there is no drift or fluctuation.
3. Anti interference measures
   • shielded cableUse shielded cables to transmit signals and reliably ground the shielding layer to reduce electromagnetic interference.
   • Stay away from sources of interferenceAvoid installing flow meters near strong electromagnetic field equipment such as frequency converters and high-power motors.

4、 Anti corrosion and anti freezing measures

1. Material Selection
   • Select corrosion-resistant materials (such as stainless steel, Hastelloy, etc.) based on the characteristics of the medium to avoid corrosion of impellers, bearings, or inner walls of pipelines.
   • If the medium contains chloride ions or acidic substances, it is necessary to regularly check the corrosion of the material and replace components if necessary.
2. Antifreeze treatment
   • Winter insulationIn cold regions, wrap the flowmeter and pipeline with insulation layer (such as rock wool, rubber sponge) to prevent the medium from freezing and expanding, which may damage the equipment.
   • Heat tracing systemFor easily frozen media such as water and oil, electric or steam heat tracing pipes can be installed to maintain the temperature of the medium above freezing point.
   • Drain the mediumWhen not in use for a long time, the medium in the pipeline should be emptied to prevent residual liquid from freezing.

5、 Discontinuation and long-term storage

1. Pre processing before discontinuation
   • Cleaning pipelinesRinse the pipeline with clean water or specialized cleaning agents to remove residual media and prevent corrosion or blockage.
   • Drying treatmentBlow dry the inside of the pipeline and flowmeter with compressed air to avoid rust caused by residual moisture.
2. Long term storage requirements
   • environmental conditionsStore the flowmeter in a dry, ventilated, non corrosive indoor environment, away from direct sunlight or high temperatures.
   • Dust protectionCover the flowmeter with a dust cover to prevent dust from entering the interior.
   • Regularly power onIf the storage time exceeds 6 months, it is recommended to power on and run for 1-2 hours every month to prevent electronic components from being damaged by moisture.