: hi, are you the little control in the housekeeper on time, to bring us today is little knowledge of electromagnetic flowmeter, electromagnetic flowmeter because of its powerful advantages itself makes the utilization rate is rising now, then we will use the electromagnetic flow meter to do preparation work before and check the work to introduce for everybody.
1, the excitation coil copper resistance to electromagnetic flowmeter check
Coil resistance is measured with high precision digital multimeter or, when necessary to make the temperature coefficient of correction, measurement and instrument archives value comparison, confirm there is no interturn short-circuit coil conduction good wait for a phenomenon, in fact coil turn-to-turn short circuit phenomenon occurring probability is very low, the check and converter excitation current check, can be indirectly assess the intensity of magnetic field of the flow sensor for change,
2, the electromagnetic flowmeter excitation coil insulation resistance check
Excitation coil and its terminal excitation circuit to ground insulation fell after be affected with damp be affected with damp, can introduce common-mode interference signals, the converter zero drift, affect the measuring accuracy, in practice, due to 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, dry heat blower terminal, often can improve insulation or insulation class when back to the factory, the fault can eliminate,
3, the electrode contact resistance check
Measuring electrode contact with the liquid resistance value can be indirect assessment of electrodes, and the lining layer surface in general condition, Emerson electromagnetic flowmeter of the flow sensor electrode contact resistance should be in the new instrument debugging good immediately after the measurement, and put on record, after each maintenance measure time, contrast analysis of these data will help to determine the cause of the problem,
4, the excitation circuit and signal circuit insulation insulation check
Mainly assessment for insulation fell while introducing interference, check the Emerson electromagnetic flowmeter 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,
This period will be here, welcome message and attention!