Double-flange differential pressure transmitter
Thread Content
We are currently using a pressure-transmitting tube type differential pressure transmitter. Due to the dirty nature of the medium, the pressure-transmitting tube tends to get clogged frequently. Can we switch to a double-flange type differential pressure transmitter for measuring the pressure difference? How long can a capillary be? Thank you
All can be replaced using the differential pressure measurement principle, but process parameters such as the medium, pressure, and temperature need to be taken into account. The capillary length depends on your flange spacing and the transmitter installation location.
It can be changed; it depends on your requirements regarding the capillaries – they aren’t very accurate to begin with
It’s completely possible; capillaries can generally reach up to 10 meters in length, which should be sufficient under normal field conditions. Dual-flange differential pressure measurement is a good option for detecting flow rate, liquid level, and reactor pressure drop. The accuracy should be around 0.5%. There are them in the Luo family, the Yokogawa family, the Huo family, and the Ximen family.
This post was last edited by ZhiGE on 2019-4-21 08:33. 1. For double-flange differential pressure transmitters, the capillary length is generally 3, 6, or 9 meters. Being too long will lead to increased damping and reduced accuracy ； It’s too long, increasing the difficulty of construction. For example, wearing a grating plate ； 2. If it is necessary to measure the differential pressure over a longer distance, one option is to use the existing pressure transmitters on the device to perform subtraction ； II. The Emerson 3051S Electronic Split Sensor (ERS) system can be used. Specifically designed for long-distance, high-precision differential pressure measurement. It electronically calculates the differential pressure (DP) using two pressure sensors connected together by a non-specialized wire, with the measurement length depending on the length of the connecting cable. Ideal applications for the 3051S ERS system include large vessels and distillation columns that typically require long capillaries or pressure transfer tubes.
ERS is indeed useful, it’s just too expensive:lol
It also depends on how large the pressure difference is. If the pressure difference is very small, using such a long capillary to transmit the pressure with silicone oil won’t allow for accurate measurement
You didn’t explain in detail either; there are some situations where replacement isn’t possible. But over 90% of them can be replaced. Capillaries can reach 10 meters, but the longer they are, the less effective they become, and the more expensive they get.
The last edit to this post was made by 1111111 on 2019-5-4 at 10:31. ERS… is it a level gauge that uses two-channel subtraction? I used this method; I was doing it years before Lao Luo…… Why is ERS so expensive? Because when one sensor is in use, its power consumption is low, so it’s easy to set a current threshold of 4mA. When two sensors are used, the power consumption doubles, and there’s also interference between the signals; as a result, achieving a current threshold of 4mA while ensuring stability is at least 10 times more difficult. Can you understand that? Who wouldn’t be able to understand it? Think about it: isn’t it exhausting to take care of one wife? And then think about whether your little guy can handle two fierce women? Hehehe :lol Things that aren’t difficult are everywhere; it’s the difficult things that are rare. Twenty years of outstanding technology at an affordable price – truly worth it.