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Common faults in the operation of split electromagnetic flowmeter

After the initial debugging and normal operation for a period of time, the split electromagnetic flowmeter fails in the operation process, the common causes of failure are: the internal flow sensor connection layer, lightning strikes, environmental changes. Below, the staff of the flowmeter manufacturer will lead you to understand some common faults of the split electromagnetic flowmeter.

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1. Internal connection layer

Flowmeter manufacturers realize that because split electromagnetic flowmeters measure more suspended solids or internal dirt than any other flow meter, inner connections occur with a higher failure efficiency. If the electrical conductivity and liquid conductivity adhesion layer is tight, the instrument can also output a normal signal, but changes the flow field, forming a hidden fault of measurement error; If the high conductivity adhesion layer, the electromotive force between the electrodes will short circuit; If the insulating layer is connected, the electrode surface insulates and disconnects the circuit. Both phenomena can cause the instrument to fail to work.

2. Lightning strikes

Internal electrical hits the circuit with high voltage induced transient surge current, which may damage the instrument to the instrument. Lightning strikes damage the instrument in three ways: the power cord, the sensor spoon converter between the excitation signal and the flow line. However, failure of various components from lightning damage is analyzed, resulting in failure of high voltage and surge current from the control room of the power supply circuit in other ways. Lightning strikes from the accident site split electromagnetic flowmeter, not only failed, control room, in other instruments electrical often occur at the same time lightning accidents. Therefore, the user knows the importance of power line control room instrumentation, lightning protection facilities. If the current general and exploratory design unit team exists to solve this problem.

3. Changes in environmental conditions

During the debugging phase, the fault environment is not only interfered with during the operation of the interference source during the debugging, for example, grounding fault protection is not ideal, split electromagnetic flowmeter, no air source plant and equipment work normally during debugging, but during the operation, new interference sources (such as point tubes or near and far tube welding implementation) interfere with the normal operation of the instrument. There are large fluctuations in the output signal.

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    More Electromagnetic Flow Meter

    Electromagnetic flowmeter is a speed meter to measure the volume flow of conductive media. While carrying out on-site monitoring and display, it can output standard current signals for recording, adjustment and control, realizing automatic control of detection, and realizing long-distance transmission of signals. It can be widely used in water, chemical, coal, environmental protection, textile, metallurgy, paper and other industries in the flow measurement of conductive liquid. The structure of the instrument has one type and one type.

    Performance Technical parameter
    Size DN3-DN3000mm
    Nominal Pressure 0.6-1.6Mpa(2.5Mpa/4.0Mpa/6.4Mpa…Max 42Mpa)
    Accuracy +/-0.5%(Standard)     +/-0.3% or +/-0.2%(Optional)
    Liner PTFE, Neoprene, Hard Rubber, EPDM, FEP, Polyurethane, PFA
    Electrode SUS316L, Hastelloy B, Hastelloy C       Titanium, Tantalum, Platinium-iridium
    Structure Type Integral type, remote type, submersible type, ex-proof type
    Medium Temperature -20~+60 degC(Integral type)
    Remote type ( Neoprene ,Hard Rubber ,Polyurethane ,EPDM) -10~+80degC
    Remote type(PTFE/PFA/FEP) -10~+160degC
    Ambient Temperature -20~+60deg C
    Ambient Humidity 5-100%RH(relative humidity)
    Measuring Range Max 15m/s
    Conductivity >5us/cm
    Protection Class IP65(Standard); IP68(Optional for remote type)
    Process Connection Flange (Standard), Wafer, Thread, Tri-clamp etc (Optional)
    Output Signal 4-20mA/Pulse
    Communication RS485(Standard), HART(Optional),GPRS/GSM (Optional)
    Power Supply AC220V (can be used for AC85-250V)
    DC24V (can be used for DC20-36V)
    DC12V (optional), Battery Powered 3.6V (optional)
    Power Consumption <20W Alarm Upper Limit Alarm / Lower Limit Alarm Self-diagnosis Empty Pipe Alarm, Exciting Alarm Explosion Proof ATEX