Electromagnetic flowmeters do not show flow

Electromagnetic flowmeter does not display the flow, the electromagnetic flow meter installed in the using process, wrong, is not in conformity with the provisions, the application is not correct, wrong wiring, case, single content, on the spot, harm is too strong, waterproof prevent bask in segregation of poor security system and a series of reasons just application of electromagnetic flowmeter soon appear problem, or reduce the service life, use 1 years later appeared to be the same problem.The electromagnetic flowmeter does not show the flow rate to analyze the cause of mechanical failure and the solution steps.

Electromagnetic flowmeter does not show the flow of mechanical reasons for failure

1. Wrong wiring

(1) connection.Before wiring the electromagnetic flowmeter, the installation position and direction should be made clear and accurate, and the field cleaning should be carried out.The wiring of the electromagnetic flowmeter includes the connection of the power cord plug, the input/output power plug, the sensor technology power plug and the working terminal.

(2) input/output data signals.The vast majority of electromagnetic flowmeters can be programmed and tested according to the PLC on the belt, and can also accept the input instructions of the main automatic control system according to the communication system bus. Therefore, the electromagnetic flowmeters are equipped with data signal input contact points, accurate measurement critical value alarm instructions and other connection points.The output data signal can be connected according to the simulation point, or can be connected with the output data signal to maintain the connection network with PC according to the rs-232 communication interface.

(3) sensor connection.If the flowmeter and the control panel are installed separately, the connection between the flowmeter and the control panel shall be conducted in the middle, which shall be used as the terminal device for the accurate measurement of the sensor technology's electric flow according to the flowmeter (actually the precise measurement control module of the geomagnetic pole and working voltage) for the accurate measurement of the basic parameters under test.

(4) wire connection.Due to the small electric flow in the work of the electromagnetic flowmeter, it is easy to be damaged by the changes in the external electric field. Therefore, the switching power supply and power plug of the electromagnetic flowmeter must serve the wiring head of the facilities, so as to ensure the accuracy of accurate measurement data and eliminate the frequent fluctuation of data information content in the measurement process.

2. Air traffic control alarm <

The flowmeter pipeline is not full, the electromagnetic flowmeter can not accurately measure, or there is no hydrodynamic flow, flowmeter is not easy to show the flow.

3. If the detection scope is not set properly or is misaligned, be sure to check

Two, the pipeline has the flow but the electromagnetic flowmeter does not show how to return a responsibility?

There are three reasons:

1. Is the display light or not?Is there a switching power supply?If everything is normal in the power supply and distribution system, the display screen is not bright, indicating that the meter head of the electromagnetic flowmeter is burned, or the display screen is damaged, to return to the original repair or replacement.

2. The display screen is bright, and the flow rate can be seen to be the best. If there is no normal flow rate, there are two cases, **, the flow rate is lower than the lower limit of the calibration of the flowmeter, and the flowmeter cannot measure small flow rate.Therefore all normal flow values are not displayed.Second, if, internal setting difficulties, you can consult the genuine project engineer to solve.

3, the flow meter itself seepage, resulting in the electrical level can not work properly, there will be no display flow.

Three, electromagnetic flow meter does not display the flow value is also a reason why: similar to atc ling dang flashing alarm, will be a common fault excitation, whether this be sure to first atc alarm, if clear tube, so will be a common fault excitation, in other words excitation line common failures or excitation line touches the wall cover, the excitation line contact met wall cover general very little status;The failure of the excitation line is usually caused by the operator breaking the excitation line during the process of dismounting the gauge head and installing it again, resulting in no flow display, indicating 0.