Abstract: the electromagnetic flow sensor resolution cycle check online information produced by excellent
flow meter, flow meter manufacturer to offer you the quotation.
Into feng instrument intelligent electromagnetic flowmeter is based on a standard manufacturing system and development, its advanced design concepts to ensure the high precision and high reliability of the product, compared with the old electromagnetic flowmeter, it has high measurement precision, high reliability, good stability,.
More flow meter manufacturers choose model price quote you are welcome to inquire, here is a resolution electromagnetic flow sensor cycle check article details online.
Intelligent electromagnetic flowmeter is based on a standard manufacturing system and development, its advanced design concepts to ensure the high precision and high reliability of the product, compared with the old electromagnetic flowmeter, it has high measurement precision, high reliability, good stability, complete function, long life and other advantages.
Measuring instrument must be run in a controlled state, so must regularly check.
Process industry of medium and small flow meter is generally bypass pipe and the corresponding stop valve, and once finish testing operation, generally are not allowed to stop water, so is unlikely to unload flow sensor, offline send lab test on flow standard device.
In order to make the electromagnetic flowmeter measurement over a period of time is accurate and reliable and does not affect the water conveyance pipe, water supply industry often take online inspection and verification method, instead of regular offline periodic verification.
1, check the electrode insulation resistance and lining.
To check the lining electrode insulation resistance, integrity or adhesive layer, for small diameter instrument can only be removed from the pipeline inspection.
For the large diameter instrument to short measurement medium, viewed from the manhole into the pipeline.
Dry electrodes and lining the inner surface, leaving no liquid stains, dry.
With 500 VDC two electrodes were measured by megger insulation resistance to ground.
If the lining of adhesive layer must be removed, according to the product thickness determine the cleaning interval period in the future.
Electrode insulation down a large part by sensor moisture or flooding caused by the outside world, sometimes with hot blow out moisture can be restored.
If it is insulation damage, such as leakage electrode, can only change the sensor, returned to the factory repair.
2, check the excitation coil insulation resistance.
After excitation coil and the terminal be affected with damp be affected with damp excitation circuit of insulation, can introduce common-mode interference signals, the converter zero drift, affect the measurement accuracy.
In practice, due to the negligence, junction box is not sealed, such as cable into the installation at the end of the sealing washer, the introduction of moisture, to insulate the terminal decline is frequent fault cases.
With hot blow dry terminal, usually insulation can improve or restore to the factory with insulation class, failure can be eliminated.
3, measuring excitation coil copper resistance.
With high precision digital multimeter or wheatstone bridge measuring coil resistance, make temperature coefficient correction when necessary.
Measured values compared with instrument archives value, confirm there is no interturn short-circuit coil conduction good wait for a phenomenon.
In fact appear coil turn-to-turn short circuit phenomenon probability is very low.
The check and converter excitation current check together, can indirectly assess the intensity of magnetic field of the flow sensor for change.
4, check the signal circuit insulation and insulation between excitation loop/signal.
This examination objective is to evaluate for insulation fell while introducing interference.
Check the signal circuit, the signal lines to temporary release and electrode.
Insulation decline for many reasons, junction box is not sealed into the moisture is a common cause.
5, check the electrode contact resistance.
Measuring electrode contact with the liquid resistance value can be indirect assessment electrode and the lining layer surface condition, such as the electrode surface and the lining layer is attached deposit, deposit or on the conductivity of the insulation.
Flow sensor electrode contact resistance should be in the new instrument debugging good immediately after the measurement, and recorded.
Every maintenance measure once, after analyzing and comparing these data will help to distinguish the cause of the problem.
Electrode and the contact resistance of measured medium depends on the size of the contact surface (
The end of the electrode size)
And the electrical conductivity of measured medium.
Electrodes to measure contact resistance compared with the measured value, if not consistent, may have the following different trends: (
1)
Resistance increases.
Show that the electrode surface has covered in insulation.
（
2)
Resistance decreases.
Sediments, coated with a conductive electrode or electrode insulation performance degradation.
Experience shows that two electrode contact resistance is close to.
The difference between the two resistance should be less than 10% ~ 20%.
Otherwise, explain two adhered on the surface of the electrode layer insulation is differ, or an electrode signal circuit insulation by a larger decline.
Electrode contact resistance available pointer multimeter in full of the medium to be measured when the measured resistance between each terminal electrode and ground.
When measured, should pay attention to the following points: (
1)
Two electrode resistance, measurement polarity must be the same, that is fixed with a measuring rod electrode, a measuring rod is always grounded.
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