Abstract: the electromagnetic flow meter scale daily maintenance methods of information produced by excellent flow meter, flow meter manufacturer to offer you the quotation.
General conditional (
Carrying out ISO9001 quality management system)
Enterprise inspection ways for: (
1)
And a third will only be used online inspection;
（
2)
, 1/3 off line do hydraulic parts after cleaning check;
（
3)
And a third offline for flow calibration.
Specific operation method:.
More flow meter manufacturers choose model price quote you are welcome to inquire, here is the electromagnetic flowmeter scale article details daily maintenance methods.
General conditional (
Carrying out ISO9001 quality management system)
Enterprise inspection ways for: (
1)
And a third will only be used online inspection;
（
2)
, 1/3 off line do hydraulic parts after cleaning check;
（
3)
And a third offline for flow calibration.
Specific operation method: operating mode 1 enterprise for electromagnetic flowmeter to do a comprehensive inspection every year.
Check the content is: appearance inspection, converter characteristic test, measurement calibration, measurement by voltage, measure the insulation resistance, confirm the circuit, etc.
Meter check adjustment because of the zero drift, zero point is very important (
“
Online zero & throughout;
Must make stops flowing measured medium, actually is not easy to do)
。
Online inspection, therefore, are often omitted contains a check of the operation of the sensor and only implement the converter calibration, so that the online test results and historical data comparison instrument is to continue to use, repair, or update, the excitation coil of sensor is measured insulation resistance degradation decided to update or not.
Operation mode 2 through online check whether there is any abnormal phenomenon on validation of electromagnetic flowmeter.
To can't stop medium flow pipeline check the flow sensor and converter respectively, with analog signals and other common instrument testing converter has higher calibration accuracy (
It depends on the analog signal accuracy)
, liquid resistance sensor examination is to test the electrode, including check the excitation coil excitation connecting cable and copper resistance, insulation resistance and check, the excitation current converter output check the indirect methods, such as magnetic field intensity.
To stop the pipeline medium flow conditions, from the preset hole into near the sensor, check all the electricity and lining/sedimentary conditions and cleaning.
Check content check electromagnetic flowmeter, in addition to the zero check, will also flow sensor, converter, and separately from the connecting cable.
1, the machine zero check are the technical requirements for the machine zero check: tube filled with liquid flow sensor measurement and no flow, at the scene of the many companies do not have this condition instead of zero check and adjustment of the machine, but can be turned to the converter separate zero check and adjustment.
Technically, this must be the sensor check finished and to ensure that the sensor excitation circuit and signal circuit insulation resistance is normal,
All include cable)
Premise is of practical significance, otherwise the machine cannot run normally.
Normally converter single zero negative value also is very small;
If the absolute value is greater than 5% of full scale will need to do first check, wait for after confirm the reason to be adjusted again.
Electromagnetic flowmeter zero and converter of the machine normally separate zero difference value is less than 1%.
Greater than 5% of the zero difference values have many case the user in the closed pipeline valve caused by incorrect zero operation under adverse conditions.
2, connect the cable to check the inspection content is to check signal and field lines each core conduction and insulation resistance, check whether the shield grounding in good condition.
3, converters, check the check the content is to use general instrument and meter type of analog signals instead of sensors to provide matching flow signal is zero and calibration.
Calibration including zero check and adjustment, value examination, excitation current, current/frequency output check, etc.
It is important to note: check project should check with the last value (
Or the factory value)
Comparison, analysis its whether there is a change or change is in line with the original measurement requirements.
4, flow sensor check the examination content is: through the inspection and check of the excitation coil transducer measured by indirect evaluation by the excitation current of the magnetic field intensity is whether to change;
Measuring electrode by fluid resistance in the evaluation of electrode surface filth and lining layer adhesion conditions;
Check each part to determine parts insulation resistance degradation degree to assess whether can introduce interference.
To stop the medium flow conditions of the pipeline can be observed and measured the electrodes and the lining thickness of adhesive layer and to estimate cleaning before and after the adhesive layer due to the flow area of incoming flow value changes.
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