Fluid Distinguisher

1. application
The calibration of pressure transmitters at several temperatures with a maximum of 250°C and a maximum of 2000 bar.

2. considerations
The desired 250°C is higher than the flashpoint of the medium used in a deadweight testers (Sebacate) so a different fluid needs to be used in the heated part of the system. A physical separator is not desirable as this adds uncertainty to the system.

3. solution
The distinguisher does not have a physical barrier, but uses a mixing chamber with a lower and upper pressure port. The lower pressure port is dedicated to be connected to the process oil (high temperature Silicon oil) which has a higher density than the Sebacate oil used in the deadweight tester. The upper pressure port is used for connecting the Sebacate part of the system.
The mixing chamber is also used for connecting additional safety devices. A pre hand pump is used to fill the system.