Can a double-flange level gauge be used in negative pressure conditions?
Thread Content
For example, there is a storage tank at the moment that is empty, containing no material; the pressure inside the tank is -50 kPa, and the temperature is normal. Can a double-flange level gauge be used in such conditions (negative pressure)? Will it cause the diaphragm to bulge? Similarly, can differential pressure transmitters not be used in negative pressure conditions, due to the same issue of diaphragm bulging?
Double-flange level gauges are typically suitable for positive pressure conditions; in negative pressure situations (such as the -50 kPa pressure inside a tank as you described), using double-flange level gauges may cause the diaphragm to bulge. Because under negative pressure, the negative pressure inside the tank acts on the diaphragm of the level gauge, which may cause the diaphragm to bulge or deform, thereby affecting the accuracy and stability of the level gauge. It is recommended to choose a level measurement device suitable for negative pressure conditions. Similarly, differential pressure transmitters also have similar problems. Under negative pressure conditions, the negative pressure is applied to the diaphragm of the differential pressure transmitter, which may cause the diaphragm to bulge or deform. Therefore, differential pressure transmitters are not suitable for negative pressure conditions. To ensure the accuracy and reliability of level measurement, a level gauge or level measurement device suitable for negative pressure conditions should be selected. .
Previously, the diaphragm of the EJA118 would bulge and could not be restored to its normal state
Double-flange differential pressure transmitters can be used in negative-pressure environments, as long as the negative pressure does not exceed the transmitter’s operational limits. Since the sensing element of a flanged pressure transmitter is a thin metal diaphragm on the flange, it will bulge to some extent under negative pressure conditions, which is a normal phenomenon.
The bulging of the diaphragm is caused, first, by the presence of visible bubbles, and second, by irreversible deformation of the diaphragm; this likely occurs when the negative pressure applied during use exceeds its maximum allowable limit.
No problem at all; everything is working normally. For domestic products, it might be necessary to remind the manufacturer regarding the operating pressure
Sure, our company is using three-effect evaporators; when purchasing them, it’s important to make sure the manufacturer knows that negative pressure is required, so as to avoid mistakes. Domestic ones can be used for over a year without any problems
Available; the purchase requires a negative-pressure diaphragm for vacuum processing.
-It can be used without issues at a pressure of 50 kPa. During installation, try to place the transmitter below the lower flange; with double flanges, the main concern is the simultaneous presence of high temperatures and high vacuum