What type of instrument is used to display the difference between two pressures?
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What brand of gauge is this? Are such gauges still available these days? Since there’s no PLC or DCS installed there, it’s still necessary to buy a gauge like this to display the readings
Differential pressure gauges for on-site display, commonly used.
U-shaped manometer, can be filled with water or mercury!
This post was last edited by qugd on 2010-7-10 13:13. Is there power at the site? If there is electricity, just install a differential pressure transmitter. If there is no power, install a differential pressure indicator; it can be one that uses pressure transfer tubes or a remote-flange diaphragm box. Stop using U-tubes; firstly, they are too outdated, and they give the impression that your factory is still in the alchemy era ； Secondly, that thing isn’t convenient to use on-site; mercury spills everywhere, and what if people ingest it and end up with soft bodies? Also, if the differential pressure is very high, what size U-tube will be needed?
A standard differential pressure transmitter can be used, with the high-pressure side connected to the pressure at the higher point and the low-pressure side connected to the pressure at the lower point.
The simplest and most convenient option is a differential pressure transmitter – the high and low pressures are connected to the positive and negative sides respectively, and it just needs 24VDC to function!
Choose thiazole based on the differential pressure grade! For use on-site, a double-diaphragm differential pressure gauge that does not require power supply can be chosen; however, lighting should be installed for observation at night ； You can also choose an electronic differential pressure gauge that requires a power supply; the digital display provides a very intuitive view. In both cases, it is necessary to connect the high-pressure and low-pressure pipelines to the gauge; the range is selected by calculating the minimum and maximum differences between them.
There are such pressure gauges with two pressure tapping ports, one higher and one lower; you can simply consult any manufacturer about them.
Maybe I didn’t explain it clearly. What I mean is that this tower is quite tall – about 18 meters high – but in order to measure the pressure difference between the top and bottom of the tower, it’s not suitable to use double-flange transmitters as they are too long. My idea is to use one pressure transmitter at each end, and send the readings from these two transmitters to a display unit in the control room, so that the difference can be shown there. This is what’s known as a “differential meter”. Since I’ve never used such a device before, and I don’t know which manufacturers produce them, I’m posting this question here... Thank you everyone
You can purchase an intelligent display meter with a subtraction function and dual inputs. Most manufacturers of smart display instruments are capable of doing this.
Local differential pressure gauges are very commonly used instruments; it’s just that they are a bit more expensive!