Seeking help with differential pressure transmitter installation and low-temperature LCD display
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I’m not very skilled, and for the current project a level gauge is needed; however, due to cost considerations, a differential pressure transmitter was used instead. The temperature of the medium inside the tank is 380°C; what length and diameter should the pressure tap pipes have in order to reduce the medium’s temperature to a reasonable level? When the ambient temperature is below 40°C, the liquid crystal will not display. How can the liquid crystal be made to display properly without the use of electric heating?
1. The cooling of the pressure intake pipe does not depend on its diameter or length. Since the fluid in the pressure guiding tube hardly flows during normal operation, as long as there is a downward section in the pressure guiding tube, the fluid can be introduced into the pressure guiding tube first when starting up the instrument; after it has cooled down, the fluid can then be introduced into the transmitter, thereby preventing the instrument from overheating ； 2. The failure of the liquid crystal to display due to low temperatures has no good solution other than heating. The transmitter can be installed close to the device, on the downwind side during winter (the inside of your device reaches temperatures of over 300 degrees) ； Or choose a transmitter that uses mechanical current to indicate the field.
Okay, thank you. For safety reasons, could we add a condenser tank?
What medium is at 380 degrees? Is there a solid form or anything else possible at lower temperatures? Consider using a remote split-display header, as well as wireless transmitters for wireless transmission, with signals sent directly back to the system
The boiling point of water at 2.5 MPa is 223°C
Given the high temperatures at the site, a double-flange differential pressure transmitter can be used. If the tank does not have suitable flange pairs, an adapter can be installed; the flanges must be filled with high-temperature silicone oil, otherwise the oil will be depleted within a few days due to the high temperatures. It shows that it has nothing to do with the high temperature at the site; it’s not the gauge head that is directly connected to the tank