Chapter 5 Fill Fluids; Quality; Fill Fluid Selection - Emerson Rosemount 1199 Reference Manual

Reference Manual
00809-0100-4002
5 Fill Fluids
This section discusses the process of selecting the appropriate fill fluid using vapor
pressure curves. To see the list of available Rosemount fill fluids, view the Rosemount DP
Level Fill Fluid Specifications
Transmitters and 1199 Remote Seals
5.1

Quality

5.1.1 Specialized processing
Emerson has implemented proprietary processes to eliminate impurities and
contaminations in the fill fluid. This additional processing ensures stable measurement
and optimal performance under extreme temperatures and vacuum conditions. The
proprietary equipment and procedures used to build remote seal systems for high
temperature/high vacuum applications are continuously improved to deliver products
that meet ever increasing application demands. Tight quality control measures such as
helium leak checking of system welds ensures the reliability of every seal system.
Additional quality checks include continual station leak and health tests to confirm the fill
quality of the finished seal system.
5.1.2 Testing
Emerson's vapor pressure curves are derived from empirical lab testing in real devices at
both vacuum conditions and at the maximum continuous temperature at one atmosphere
of pressure. The maximum continuous temperature at one atm of pressure correlates to
the thermal stability of the fill fluid, which is the maximum temperature the fill fluid will
remain in its original molecular form. Over time, exceeding the maximum recommended
temperature may result is the decomposition or vaporization of the fill fluid, resulting in
device failure.
5.2

Fill fluid selection

Fill fluid selection is very important to the safety and reliability of your measurement
application.
5.2.1 Type of fill fluid
Different types of fill fluids exist to meet the needs of different applications. An all-purpose
fill fluid can be used in most applications. However, some processes might require a fill
fluid that is chemically inert to avoid reactions with oxygen. In the food and
pharmaceutical industries, a hygienic fill fluid may be needed that meets various industry
standards.
Rosemount DP Level
Technical Note, or reference the Rosemount DP Level
Product Data Sheet.
Fill Fluids
May 2020
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