How to judge the display failure of a metal tube float meter?

How to quickly determine the display failure of metal tube float meter?

The most widely used flowmeter in industry is the metal tube float flowmeter, because the metal float meter has the advantages of simple structure, convenient maintenance, corrosion protection and remote transmission of data. There will be some failures during the operation of the metal float meter.

The most widely used flowmeter in industry is the metal tube float flowmeter, because the metal tube float flowmeter has the advantages of simple structure, convenient maintenance, corrosion protection and remote transmission of data. Metal tube flow meter in the use of some faults in the operation process, such as often stuck, volatility, indicating no, grasp the working principle of metal tube float flowmeter, conducive to the maintenance and repair of metal flow meter.

In the process of maintenance and repair of metal tube float meter, the most common fault phenomenon is that the instrument is stuck and can not show the actual flow. According to the structure principle of metal float flowmeter, the method of troubleshooting is as follows.

Remote display of fault.

In the field maintenance and maintenance of metal tube float flowmeter, it is often seen that the flow indicator is constant and fixed at a certain value. At this point, the first step is to use the "segmentation method" to analyze the fault of the table circuit component or DCS control room. The quick judgment method is to change the position of the local remote display part to the upper and lower part of the rotor, and simulate the dynamic flow state of the float. Metal float at this time is fixed, using the float magnetic principle, monitor the follow-up magnetic steel and the float coupling linkage if the float is stuck, mobile display part of the pointer to function change, according to the evidence that part of the normal. If the pointer cannot be changed to find remote display and signal power failure. The reasons for failure are as follows:

1. Pointer jitter

(1) the pointer of the metal tube float meter is due to slight fluctuation due to the fluctuation of pipeline and medium;

(2) the pipeline and media are slightly volatile due to unstable operating pressure;

The above fault can contact the control room to find the operation reason, adjust the process parameters to stabilize the pressure, the temperature flow, increase the metal float flowmeter damping, and improve the process environment to stabilize the flow meter.

2. The pointer card

(1) shock. When other equipment is overhauled or repaired, the pointer deformation is loose, so that the pointer deformation cannot reflect the actual flow value. The method is: replace the installation adjustment with the same type of display table;

(2) the glass panel of the metal tube float meter is damaged and the needle is jammed. The method is: open the display table and replace the glass panel.

3. Signal power failure.

(1) failure of signal amplification and conversion components;

(2) screw loose line transmission failure;

(3) connection terminal failure of DCS control station;

(4) control station I/0 module failure.

Troubleshooting method is: use "segmentation method" in the control room control station set terminal after measuring voltage DC (1-5) V, analysis the judgment is a field failure or control failure, failure rate is highest terminal loose screws, fastening screw fault can be ruled out. Fault cannot be ruled out according to the terminal, find DCS fault measurement module, search module failure indicator, see if there is a failure, also can use "replace" replace the same model measuring module replacement, to see if display is normal.