E + H Endershaus electromagnetic electromagnetic flow meter provides high-grade high precision measurements. It can be used in strict sanitation, and provides safety certification applicable to hazardous situations, which will also fail during installation.
First, debugging period fault
Debugging is expected that the fault generally appears in the meter installation and commissioning phase, once excluded, will not appear again under the same conditions later. Common debugging periods is typically caused by the cause of improper installation, environmental interference, and fluid characteristics.
1) Installation
Usually, the electromagnetic flow sensor is installed in an incorrect failure, which is common, such as mounting the sensor to the tube of the volator gas, or the vertical tube mounted from the top, may be emptied; or after the sensor No back pressure, fluid is discharged directly into the atmosphere and forms a measurement tube is not full.
2) Environmental aspect
Usually mainly, pipe stray current interference, spatial strong electromagnetic wave interference, large motor magnetic field interference, etc. Pipe stray current interference usually takes a good single ground protection to achieve satisfactory results, but if a powerful stray current (such as electrolytic workshop pipe, sometimes induced on the two electrodes, the peak of the peak VPP can be as high as 1V), still Additional measures and flow sensors are required to be insulated from pipelines. Spatial electromagnetic interference is typically introduced by signal cables, typically protected by single-layer or multi-layer shielding.
3) Fluid aspect
Micro-bubbles containing uniformly distributed in the liquid generally does not affect the normal operation of the electromagnetic flowmeter, but as the bubbles increase, the instrument output signal will fluctuate. If the bubble is large enough to cover the entire electrode surface, as the bubble flow The over electrode will cause the electrode circuit to make a large fluctuation of the output signal.
When the electromagnetic flowmeter of the low frequency wavelength measurement is measured when the solid content excessive slurry will also produce a slurry noise to cause the output signal to fluctuate.
When measuring the mixed medium, if the flow sensing is measured, the output signal will fluctuate if it is measured before the mixing is not uniform.
Improperization of electrode materials and mediated media will also affect normal measurements due to chemical or polarization. The electrode material should be properly selected depending on the instrument or the relevant manual.
Second, the runtime fault
The runtime fault is an electromagnetic flow meter. It is generally caused by factors such as the wall attached to the walls, lightning strikes, and environmental conditions.
1) The inner wall attached layer of the sensor is often used to measure the dirty fluid due to electromagnetic flow, and it is often accommodated to accompany the layer in the inner wall of the sensor. These faults are often due to the electrical conductivity of the attached layer or too small. If the attachment is an insulating layer, the electrode circuit will make a break, the instrument does not work properly; if the attachment layer conductivity is significantly higher than the fluid conductivity, the electrode circuit will short-circuit, and the instrument does not work. Therefore, the electromagnetic flowmeter measurement tube should be removed in time.
2) Thundermatic strike
Lightning strikes can feel high voltage and surge current in the instrument line, so that the instrument is damaged. It is primarily introduced primarily through power lines or exciting coils or flow signal lines between the sensors and the converters, especially from the control chamber power cord to account for most.
3) Changes in environmental conditions
During the debugging period, due to the environmental conditions (such as no interference sources), the flowmeter is working fine, and it is often easy to neglect the installation conditions (such as grounding is not good). In this case, once the environmental condition changes, new interference sources (such as electrical welding on the pipeline near the flowmeter, the large-scale transformer, etc.), the normal operation of the meter, the output output of the flow meter The signal will fluctuate.
Editor in charge: WV
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