What is the minimum pressure that can be measured by a double-flange diaphragm differential pressure transmitter?
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For the existing double-flange diaphragm differential pressure transmitters, the operating differential pressure specified in the process is 0.1 KPa; after checking a manufacturer’s catalog, it seems that such transmitters are not capable of measuring this value. Have any of you used differential pressure transmitters in this operating condition? What is the minimum differential pressure that can be measured by the double-flange diaphragm differential pressure transmitters of various manufacturers? I would appreciate your guidance. Thank you!
What sample were you checking? Just take a quick look at the EJA118 – they should all be pretty much the same.
What’s being considered is the EJA118. Based on the sample specifications, its range is 2.5 to 100 kPa, and with a precision of 0.2%, the minimum measurable value should be 0.2 kPa. Additionally, the length of the capillary tube must be at least 5 meters, which also has an impact on accuracy. It seems that the measurement will be inaccurate at a pressure of 0.1 kPa. Thank you for the reply.
1. Double flange instruments are of coarse precision. 2. For a range of less than 10 kPa, it has dual-flange design and accuracy that’s terrible – as bad as shit, really, as bad as shit. It’s like shit. Important things should be said (3+1) times. 3. I can’t understand why a dual-flange design is needed when a differential pressure of 0.1 kPa is involved! 0.1 kPa, a pressure equivalent to just 1 centimeter of water column height. Damn it, the pressure is well above 0.1 kPa as well. It can’t be for measuring liquid, right? It’s probably for gas measurement, right? 4. A pressure of 0.1 kPa, which is far lower than that of a small fart – why use double flanges then? Why dig? Can’t understand it.
0.1 kPa is already very low, indicating a relatively high compression ratio. It’s not very easy either without a capillary, right? It’s so small, and plus there’s the precision issue with capillaries; give up on it. The instructions in the sample refer to those without a capillary, right?
The process requires measurement of differential pressure along with remote alarm and interlock functions; since it is exhaust gas that is being measured, it seems that two pressure transmitters are necessary in order to calculate the differential pressure. At first, it was to save some money. Thank you for getting back to me :)
2.5-100kPa, which means it can have a range of 2.5kPa; 2.5*0.2% = 0.005
Even for measuring differential pressure, a differential pressure transmitter can be used directly – one that doesn’t require flanges, but rather uses guide tubes, like the EJA110.
The gas is corrosive. But thanks anyway
Ordinary differential pressure transmitters should be avoided for such small differential pressures, let alone flanged types A pressure transmitter flipping in one direction can cause such large pressure fluctuations.