Why does the turbine flowmeter have no indication?
Thread Content
Our factory is currently using the LW (25) turbine flowmeter produced by Tianjin Dagang Instrument Co., Ltd., which malfunctioned during normal production. The situation is like this: First of all, the instructions fluctuated greatly. When we arrived at the scene, there were no instructions soon. (Indicated as "0. 00”) Since crude oil is used, it was dismantled on site and blown clean with steam. Take it back to the maintenance room to check the reason. But when I returned home and used the meter to measure, it worked again. It took less than an hour to put it back on site and there was no instruction. Later, we disassembled and assembled it several times, but sometimes it worked and sometimes it didn't. I would like to ask brothers to help analyze what is the reason. Also I would like a copy of its manual.
Is the load capacity of the safety barrier poor? Under the test, it is powered separately. Or the performance of a certain component in the circuit is not good.
Fiber-like debris becomes entangled, causing its accuracy to decrease until it cannot be used or the sensing element is easily covered by debris! Can you try adding a filter in front?
It is best not to use a turbine flowmeter to measure crude oil. Turbine flowmeters are suitable for measuring liquids with low viscosity. They are not recommended for liquids with high viscosity. The viscosity of crude oil is very high. It is best to use a dual-rotor flowmeter or a scraper flowmeter for high measurement accuracy and low failure rate.
I don’t know if it is a high-viscosity Porter-type turbine flowmeter. It expands the upper and lower cone diameters on the base of the Porter-type floating rotor pressure balance structure, and adds structures such as viscosity compensation wings and pressure-bearing blades. If these structures are damaged, the measurement will be inaccurate or even impossible. It is also possible that the magnetic conductive device (i.e. sensor) is aging and cannot detect it.
Crude oil has high viscosity. You have chosen the wrong type. Use the handle of the rotor.
If the fault cannot be solved after eliminating other problems, it is recommended to check the shielding grounding and nearby electrical interference. We have experienced similar glitches before.
Is the mechanical part loose or the circuit contact poor?
Need to clarify: 1 How long has this watch been used? Is it newly installed? How long has it been in normal use? 2. It was removed and tested normally, indicating that there is no major problem with the watch itself. Because the turbine relies on magnetic signals for detection, there are two possibilities for the situation during use. One is that the signal is interfered by the magnetic field, causing signal problems, and the other is that the turbine simply does not rotate normally. You can use a multimeter to test whether the PICK-UP has pulse output on site. You can use a separate battery pack to power the PICK-UP to eliminate the influence of the secondary meter. I have done this before, haha, to measure crude oil, it is better to use other flowmeters, such as positive displacement ones.