Differential pressure transmitter troubleshooting
In the catalyst production process, it is necessary to measure the pressure and flow rate of the slurry. Although the pressure guiding pipe is very short, after the instrument is used for a period of time, it is often found to be blocked, which causes the meter output to change slowly or even unchanged. Analysis and measures In the production process, it is often encountered that the measured medium contains solid suspended particles or powder. After a long time, some will solidify, causing the pressure conduit to clog, making the measurement impossible. In this case, the usual impulse tube gauge cannot be used, but a diaphragm pressure gauge or a remote flange transmitter is used. Although the remote flange type transmitter is more expensive, since there is no pressure guiding pipe, there is no clogging problem; the flange bellows has a large area, and it is easy to remove the measured medium and can withstand higher temperatures. So it is very common now. In addition to being used to measure the slurry containing suspended particles, the medium which is too viscous, easy to freeze, solidify and crystallize, the gas used in the pressure tube is more likely to be condensed, or the liquid medium is more prone to gasification. Occasionally, if the medium in these cases is measured by a common meter, the static pressure in the duct will change and the output of the meter will be unstable. Flange transmitters are also often used for processes that require hygienic food production or that require flushing between the two batches. The differential pressure transmitter has a flow measurement system for the high-low pressure conduit and the reverse fault phenomenon. The primary component is an orifice plate and the differential pressure transmitter is a measurement instrument. When the system is put into operation, the output of the differential pressure transmitter does not rise, but runs below zero. Analysis and judgment When the flow measurement system matched with the orifice plate and the differential pressure transmitter is put into operation, the output of the instrument will run below zero. This may have the following reasons: (1) The high-pressure conduit of the transmitter is blocked or leaked; (2) The transmitter is high. The low-pressure conduit is reversed; (3) the medium in the process pipe flows in the opposite direction; (4) the transmitter is faulty. After inspection, the transmitter is good, the output can change with the change of the differential pressure signal, and the pressure guiding tube is not blocked or leaked, but the high and low pressure guiding tube is reversed (the medium flow direction is opposite, and can also be regarded as the guiding pressure). Pipe connection reverse). The treatment measures to deal with the problem of reverse connection between high and low pressure pressure pipes are difficult for previous pneumatic transmitters and some electric transmitters, and need to be reinstalled, requiring hot fire, especially for the process equipment being put into operation. And the instrument system with insulation and heat tracing is even more troublesome. Concerned about surprises Label: Differential Pressure Transmitter Troubleshooting Previous: Replacement and maintenance of dust bag bag Next: Vortex flowmeter main problem and its solution Auto Led Back-Up Light,Car Backup Lights,Car Back Up Lights,Car Back Up Light CHANGZHOU CLD AUTO ELECTRICAL CO.,LTD , https://www.cld-leds.com
However, for smart transmitters, the method of handling high and low voltage conduits is relatively simple, and there are many ways. For example: There are two types of smart transmitters from Shandong Feichuang Instrument Series. (1) Changing the relative position between the detecting member and the transmitting member and the pressure guiding tube interface. There are two high-pressure guides and low-pressure guides in Shandong Feichuang Instrument Series Transmitter, which are interchangeable. If the front guide port is connected to the pressure guiding tube, the latter one is connected to the draining liquid to discharge the plug. Therefore, it is only necessary to rotate the relative position of the detecting part and the conveying part by 180 and change the pressure guiding port to the other. When changing the relative position of the two parts of the test transmission, first pull out the connector of the flat cable in the transmission part, and then loosen the two external hexagon socket fixing screws to rotate. Do not turn the cable to rotate, this will It breaks; (2) changes the position of the positive and negative tabs. In the past, the transmitter only had one effect, that is, the differential pressure signal increased, and the output of the meter also increased, which is often referred to as positive action. However, for the FCX-A/C transmitter, there is also a reaction, that is, the differential pressure signal increases and the meter output decreases. The method of selecting the positive and negative action is to change the position of the tab, so if the pressure guiding tube is reversed, it is only necessary to change the tab in the table from the positive action "NOR" position to the reaction "REV" position. When changing the position of the positive and negative tabs, first remove the cover with the display window, loosen the screws of the two fixed display panels, remove the display panel, and then see the tab on the board, and put it by hand. Gently pull down and insert the desired position. 