Rosemount 1199 User manual

Rosemount 1199 Seal Systems Manual
Reference Manual
00809-0100-4002 Rev. BB
November 2012
www.rosemount.com

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Reference Manual
00809-0100-4002, Rev BB
November 2012 Rosemount 1199
www.rosemount.com
Rosemount 1199 Seal Systems
NOTICE
Read this manual before working with the product. For personal and system safety, and for
optimum product performance, make sure you thoroughly understand the contents before
installing, using, or maintaining this product.
Within the United States, Rosemount Inc. has two toll-free assistance numbers:
Customer Central Technical support, quoting, and order-related questions.
Americas 1 800 999 9307
Europe [phone]
Middle east [phone]
Asia [phone]
North American Response Center Equipment service needs.
1-800-654-7768 (24 hours—includes Canada)
Outside of the United States, contact your local Emerson Process Management
representative.
The products described in this document are NOT designed for nuclear-qualified
applications. Using non-nuclear qualified products in applications that require
nuclear-qualified hardware or products may cause inaccurate readings.
For information on Rosemount nuclear-qualified products, contact your local Emerson
Process Management Sales Representative.

This page intentionally left blank

Reference Manual
00809-0100-4002, Rev BB
November 2012
TOC-1
Rosemount 1199
SECTION 1
Introduction Using This Manual. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-1
Service Support. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-2
Product Recycling/Disposal. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-2
SECTION 2
Understanding DP Level DP Level and Remote Seal System Measurement . . . . . . . . . . . . . . . . . . . . . . 2-1
Terminology of System Components. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-1
Understanding Seal System Performance. . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-2
Seal Temperature Effects (Process Temperature Error) . . . . . . . . . . . . . . . 2-2
Head Temperature Effects (Ambient Temperature Error) . . . . . . . . . . . . . . 2-3
System Time Response . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-3
Balanced vs. Tuned-System™Assemblies . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-4
Specifying the Right Solution for Vacuum Applications. . . . . . . . . . . . . . . . . . . 2-6
Vacuum Application Overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-6
Vacuum Applications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-6
Transmitter Mounting Position . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-6
Fill Fluid Selection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-7
Diaphragm Weld Types. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-7
Solid Faceplate Design. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-7
Seam Weld Design. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-7
Brazed Design . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-8
Differences between Electronic Remote Sensors and Capillary Systems. . . . . 2-8
Instrument Toolkit: Seal Ordering and Application Process . . . . . . . . . . . . . . . 2-8
Thermal Optimizer: Proper Use and Applications . . . . . . . . . . . . . . . . . . . . . . . 2-8
Thermal Optimizer Limitations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-9
SECTION 3
Installation Seals Handling and Installation Considerations . . . . . . . . . . . . . . . . . . . . . . . . 3-1
Gaskets . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-2
Tagging . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-3
Flanged Type Seals: Flush Flange (FFW) or Extended (EFW) Diaphragm . . . 3-4
Bolt Torquing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-5
Flushing Connection Ring Installation (Flanged cont.). . . . . . . . . . . . . . . . . 3-5
Gasket Installation (Flanged cont.). . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-5
RFW Seal . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-6
Bolt Torquing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-6
Flushing Connection Lower Housing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-6
Gasket Installation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-6
4.1-in. (104 mm) Diaphragm Diameter Option . . . . . . . . . . . . . . . . . . . . . . . 3-6
PFW Pancake Type Seals. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-7
Capillary Support Tube. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-7
Process Flange. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-7
Bolt Torquing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-7
Flushing Connection Ring Installation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-8
Gasket Installation (pancake cont.) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-8
RTW Threaded Type Seals. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-8
Lower Housing Installation Procedure . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-8
Upper Housing Installation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-9
Gasket Installation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-9
Alternative System Installation Procedure . . . . . . . . . . . . . . . . . . . . . . . . . . 3-9
Table of Contents

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TOC-2
WSP Saddle Type Seals . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .3-9
Lower Housing Installation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .3-10
Upper Housing Installation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .3-10
Gasket Installation. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .3-10
TFS Wafer Style In-line Seal . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .3-11
Handling . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .3-11
Connection Styles . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .3-11
Flanged Type Connection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .3-11
Hygienic Tank Spud Seals . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .3-12
Hygienic Flanged Tank Spud Seals . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .3-13
Hygienic Approvals . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .3-13
Clamp Style Tank Spud (SSW). . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .3-13
Flange Style Tank Spud (EES) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .3-13
Hygienic Tank Spud Welding Guidelines (SSW) . . . . . . . . . . . . . . . . . . . . . . .3-13
Tank Preparation. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .3-14
Welding . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .3-15
Hygienic Tri-Clamp®Seals (SCW) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .3-16
Clamp and Gasket. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .3-17
Calculating Range Points . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .4-1
Remote Seals . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .4-1
SECTION 4
Ranging the
Transmitter
Zero-based lower range value. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .4-2
Non-zero based lower range value . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .4-3
Transmitters installation Best Practices . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .4-8
OPEN TANK (Zero Based) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .4-8
CLOSED TANK (Non Zero Based) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .4-8
Zero Based lower range value. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .4-9
Closed tank example (non-zero Based lower range value). . . . . . . . . . . . .4-10
Scale Display. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .4-12
SECTION 5
Fill Fluids and
Vapor Pressure
Curves
Fill Fluid Specifications – Silicone 200 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .5-1
Silicone 200 Description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .5-1
Fill Fluid Specifications – Silicone 704 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .5-3
Silicone 704 Description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .5-3
Fill Fluid Specifications – Syltherm XLT Silicone . . . . . . . . . . . . . . . . . . . . . . . .5-4
Syltherm XLT Description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .5-4
Fill Fluid Specifications – Silicone 705 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .5-5
Silicone 705 Description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .5-5
Fill Fluid Specifications – Inert (Halocarbon) . . . . . . . . . . . . . . . . . . . . . . . . . . .5-6
Halocarbon Description. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .5-6
Fill Fluid Specifications – Neobee M-20 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .5-7
Neobee M-20 Description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .5-7
Fill Fluid Specifications – Glycerin and Water . . . . . . . . . . . . . . . . . . . . . . . . . .5-8
Glycerin and Water Description. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .5-8
Fill Fluid Specifications – Propylene Glycol & Water . . . . . . . . . . . . . . . . . . . . .5-9
Propylene Glycol Description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .5-9
SECTION 6
Maintenance and
Troubleshooting
Cleaning . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .6-1
Return of Materials . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .6-1
Troubleshooting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .6-1

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APPENDIX A
Reference Data Rosemount 1199 Direct Mount Seal Systems . . . . . . . . . . . . . . . . . . . . . . . . . A-1
Rosemount 1199 Remote Mount Seal Systems. . . . . . . . . . . . . . . . . . . . . . . . A-6
Capillary/Fill Fluid . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . A-7
Dimensional Drawings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . A-12
Spare Parts. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . A-13

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Reference Manual
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November 2012 Rosemount 1199
www.rosemount.com
Section 1 Introduction
USING THIS MANUAL This manual is designed to assist in installing, operating, and maintaining the
Rosemount 1199 Seal Systems for Pressure Transmitters. The manual
contains supplemental information about the seal system assemblies that are
not covered in the corresponding transmitter manuals.
The information is organized into the following categories:
• Section 2: Understanding DP Level
• Section 3: Installation
• Section 4: Ranging the Transmitter
• Section 5: Fill Fluids and Vapor Pressure Curves
• Section 6: Maintenance and Troubleshooting
• Appendix A: Reference Data
See Product Data Sheet 00813-0100-4016 for more detailed information on
specific Rosemount Remote Seals.
A remote seal system consists of a pressure transmitter, a remote diaphragm,
and either a direct mount or capillary style connection filled with a secondary
fill fluid.
During operation, the thin, flexible diaphragm and fill fluid separate the
pressure sensor of the transmitter from the process medium. The capillary
tubing or direct mount flange connects the diaphragm to the transmitter.
When process pressure is applied, the diaphragm is displaced, transferring
the measured pressure through the filled system, by way of the capillary
tubing, to the transmitter. This transferred pressure displaces the sensing
diaphragm in the pressure sensor of the transmitter. This displacement is
proportional to the process pressure and is converted electronically to an
appropriate output current, digital HART(Highway Addressable Remote
Transducer), or FOUNDATION fieldbus output signal.

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SERVICE SUPPORT To expedite the return process outside of the United States, contact the
nearest Emerson Process Management representative.
Within the United States, call the Emerson Process Management Instrument
and Valve Services, Response Center using the 1-800-654-RSMT (7768)
toll-free number. This center, available 24 hours a day, will assist you with any
needed information or materials.
The center will ask for product model and serial numbers, and will provide a
Return Material Authorization (RMA) number. The center will also ask for the
process material to which the product was last exposed.
Emerson Process Management Instrument and Valve Services, Response
Center representatives will explain the additional information and procedures
necessary to return goods exposed to hazardous substances.
PRODUCT
RECYCLING/DISPOSAL Recycling of equipment and packaging should be taken into consideration
and disposed of in accordance with local and national legislation/regulations.
Individuals who handle products exposed to a hazardous substance can avoid injury if they
are informed of and understand the hazard. If the product being returned was exposed to a
hazardous substance as defined by OSHA, a copy of the required Material Safety Data Sheet
(MSDS) for each hazardous substance identified must be included with the returned goods.

Reference Manual
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November 2012 Rosemount 1199
www.rosemount.com
Section 2 Understanding DP Level
DP Level and Remote Seal System Measurement . . . . . . .page 2-1
Terminology of System Components . . . . . . . . . . . . . . . . . .page 2-1
Understanding Seal System Performance . . . . . . . . . . . . . .page 2-2
Balanced vs. Tuned-System™ Assemblies . . . . . . . . . . . . .page 2-4
Specifying the Right Solution for Vacuum Applications . . . .page 2-6
Diaphragm Weld Types . . . . . . . . . . . . . . . . . . . . . . . . . . . .page 2-7
Differences between ERS and Capillary Systems . . . . . . . .page 2-8
Instrument Toolkit: Seal Ordering and Application Process .page 2-8
Thermal Optimizer: Proper Use and Applications . . . . . . . . .page 2-8
DP LEVEL AND REMOTE
SEAL SYSTEM
MEASUREMENT
DP Level is a reliable measurement solution for measuring level, density,
interface, or mass of a process media inside a tank.
Remote seal system measurement is unaffected by agitation, foam, or
internal obstacles. Remote diaphragm seals extend limitations due to process
conditions such as high and low temperatures, corrosive processes, viscous
mediums, and sanitary connections.
TERMINOLOGY OF
SYSTEM COMPONENTS Figure 2-1 lists the basic components for seal assemblies.
Figure 2-1. Components on a
two and single seal assembly
TWO SEAL ASSEMBLY SINGLE SEAL ASSEMBLY
Pressure, Differential Pressure, or
MultiVariable Transmitter
Process Flange
Direct Mount
Remote
Diaphragm
Flushing
Connection
Capillary
Remote
Diaphragm
Process Flange

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Figure 2-2. FFW Exploded View
UNDERSTANDING SEAL
SYSTEM
PERFORMANCE
Seal Temperature Effects
(Process Temperature
Error)
Fill fluids expand or contract with temperature changes, creating a volume
change that is absorbed by the diaphragm seal and is seen as back pressure at
the transmitter. This back pressure creates a shift in the transmitter reading. For
symmetrical or balanced systems, this error is usually minimal due to the back
pressure being equal on both sides. However, head temperature effect is still
present.
NOTE
Other factors that affect seal temperature effect include diaphragm thickness,
seal type and size, capillary length and inner diameter.
Figure 2-3 on page 2-3 shows how diaphragm size can affect the measurement
reading at the transmitter. For smaller seal sizes, such as the 1 1/2-in. size, the
amount of back pressure on the transmitter causes an additional 12.1 inH2O
error. Moving to the 2-in. size gives 1.7 inH2O and the largest 3-in. size shown
only has 0.5 inH2O error. Using a larger diaphragm can drastically improve
performance and provides a more stable reading.
NOTE
Calculations done in Toolkit with Silicone 200 fill fluid with 3051 Transmitter.
Process Flange
Diaphragm
Flushing Connection
Gasket
Clamp

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Rosemount 1199
Figure 2-3. Back pressure on
diaphragm causing error
NOTE
Seal temperature effects decrease as seal size increases.
Head Temperature
Effects (Ambient
Temperature Error)
Head temperature effect is due to the change in specific gravity of the fill fluid
caused by a change in ambient temperature. When installed, the weight of the
fill fluid will produce an initial pressure read by the transmitter, equalling the
height between the high and low connection taps multiplied by the fill fluid's
specific gravity. As ambient temperature changes, the fill fluid specific gravity
will change causing the weight of the fill fluid to change, thus changing the
pressure read by the transmitter. Head effect will be seen in both
Tuned-System™Assemblies and Balanced System Assemblies and will have
the same impact on the transmitter regardless of where the transmitter is
mounted.
System Time Response The time response of a system is based on the type of transmitter, its sensor
range, the length and inner diameter (ID) of the capillary, and the viscosity of
the fill fluid (which is directly affected by the process and ambient
temperatures). These factors all play a role in the overall performance of any
seal system. Below is an example including 3 applications with the same
process and ambient temperatures. The difference is one system is balanced
(equal lengths of capillary), the other two are tuned systems (high pressure
side is a direct mount with low pressure side connected via capillary) but one
has a 0.040 in. capillary ID size and the other has the 0.075 in. capillary ID
size.
HEAT HEAT HEAT
2 in.
1.7 inH2O
(43 mmH2O)
3 in.
0.5 inH2O
(13 mmH2O)
1 ½ in.
12.1 inH2O
(307 mmH2O)

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Table 2-1. Response Time vs.
Total Performance Example
NOTE:
Calculations done in Toolkit with Silicone 200 fill fluid with 3051 Transmitter
and FFW seal.
NOTE
0.075 capillary inner diameter with long lengths of capillary, over 25ft. (7.6m)
can result in the diaphragm bottoming out in applications with cold ambient
and cold process temperatures. For these applications, 0.075 in. should be
avoided in cold conditions (cold ambient and cold process, as the seal system
will bottom out) or deform at hot conditions. A smaller ID size, either 0.040 in.
or 0.028 in. should be selected.
BALANCED VS.
TUNED-SYSTEM™
ASSEMBLIES
A balanced system is a symmetrical system that has the same seal and equal
amount of capillary on the high and low pressure sides. Since the capillary
lengths are the same, each side ideally has the same amount of fill fluid,
minimizing or completely eliminating the seal temperature effect due to equal
pressure on both sides of the transmitter diaphragm. The balanced systems
are still affected by the head pressure as shown in Figure 2-4.
NOTE
Smaller diaphragms will cause a larger ± tolerance due to stiffness
characteristics.
Application #1 Application #2 Application #3
Process Temperatures -49 °F (-45 °C) to
401 °F (205 °C) -49 °F (-45 °C) to 401 °F (205 °C) -49 °F (-45 °C) to 401 °F (205 °C)
Ambient Temperatures 32 °F (0 °C) to
104 °F (40 °C) 32 °F (0 °C) to 104 °F (40 °C) 32 °F (0 °C) to 104 °F (40 °C)
Assembly Type Balanced System Tuned-System Tuned-System
Capillary Length 15 meter 15 meter 15 meter
Capillary ID 0.075-in. (1.905 mm) 0.075-in. (1.905 mm) 0.04-in.(1.092mm)
Response Time
Ambient Temp. at 0, 20,
and 40 °C
1.9, 1.3, 1.1 sec 1.6, 1.2, 1.0 sec 4.1, 2.6, 2.1 sec
Total Performance
Ambient Temp. at 0
and 40 °C
±3.15%, ±1.89% ±0.90%, ±0.27% ±2.45%, ±1.31%

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Figure 2-4. Balanced System
NOTE
Temperature effects were calculated in Instrument Toolkit using a 2-in. (DN
50) FFW seal, Silicone 200, 10 ft. (3 m) between the taps, over a 50 °F (28
°C) temperature change.
Tuned-Systems Assemblies are asymmetrical systems with one seal directly
mounted and another seal connected via capillary. Another possible
Tuned-System Assembly is any remote seal system with unequal lengths of
capillary or two different remote seals on the high and low pressure
connections. Due to the unequal lengths of capillary, there are seal
temperature effects. However, this seal temperature effect counters the head
pressure from the oil-filled capillary and reduces total temperature effects on
the entire system.
Figure 2-5. Tuned-System
Assembly
(Cancels out)

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NOTE
Temperature effects were calculated in Instrument Toolkit using a 2-in. (DN
50) FFW seal, Silicone 200, 10 ft. (3 m) between the taps, over a 50 °F (28
°C) temperature change.
SPECIFYING THE RIGHT
SOLUTION FOR
VACUUM
APPLICATIONS
Vacuum Application
Overview When a vessel is under a vacuum pressure, it is important to specify the
correct transmitter remote seal system to measure level accurately and
reliably. Failure to do so can result in output drift or complete system failure.
The combination of high process temperature and vacuum process pressure
conditions creates additional requirements when specifying the transmitter
remote seal system.
Vacuum Applications There are three primary transmitter-seal system components necessary to
successfully specify vacuum application solutions:
• Transmitter Mounting Position
• Fill Fluid Selection
• Seal System Construction
Seal System Construction for Vacuum Applications
Emerson offers Rosemount 1199 seal assemblies, welded-repairable, and
All-Welded vacuum system construction. In vacuum applications below 6 psia
(310 mmHga), specify the All-Welded vacuum construction. Gasket
connections allow the potential for vacuum pressure to draw air into the
capillary system causing drift or complete system failure. No air in the system
eliminates the need to re-zero and thus improves plant availability by
preventing unscheduled downtime and instrument repair or replacement.
The all welded vacuum construction was designed specifically for vacuum
applications. In this construction, the sensor module gaskets are removed
and a disk is welded over the sensor isolators. This eliminates the possibility
of air being drawn into the seal system in deep vacuum conditions. This
premium design is strongly suggested for vacuum pressures below 6 psia
(310 mmHga).
Transmitter Mounting
Position Mounting the pressure transmitter at or below the bottom vessel tap is an
important factor to ensure a stable measurement with vacuum applications.
The static pressure limit for a differential pressure transmitter is 0.5 psia (25
mmHgA), which ensures the transmitter sensor module fill fluid remains within
the liquid phase of the vapor pressure curve.
If the vessel static limit is below 0.5 psia, mounting the transmitter below the
bottom tap provides a capillary fill fluid head pressure on the module. A
general rule is to always mount the transmitter approximately 3 ft. (1 m) below
the bottom tap of the vessel.

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November 2012
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Rosemount 1199
Fill Fluid Selection When the process is under vacuum conditions, the fill fluid can vaporize at a
lower temperature than when it is under normal atmospheric or greater
pressure. Each fill fluid has a specific Vapor-Pressure curve. The
Vapor-Pressure curve indicates the pressure and temperature relationship
where the fluid is in a liquid or a vapor state. Proper seal operation requires
the fill fluid to remain in a liquid state. For vacuum applications, specify fluids
with a premium combination of vapor-pressure curve and high temperature
limits like Silicone 704 or Silicone 705.
DIAPHRAGM WELD
TYPES Weld-type is factory-determined as best for the seal typed specified. PFW and
FFW seals have ordering options that specify welding options.
Solid Faceplate Design The solid faceplate design is used when diaphragm and upper housing
material are the same or when the weld is not wetted. This design is:
• The most efficient design to build and is the typical standard.
• TIG weld is used in solid faceplate design; this weld is wetted.
Seam Weld Design This design is used when the upper housing material is different from the
diaphragm material. The seam welded design has a hermetic weld at the
inner diameter of the diaphragm and a TIG weld at the outer edge. The
diaphragm floats on the upper housing over the gasket surface area and
could tear if a metallic gasket were used.
• Not used with wire-wound metal gaskets
Upper Housing
Material A
Material A TIG Weld point
Diaphragm
Upper Housing
Diaphragm
Material A
Material B

Reference Manual
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November 2012
Rosemount 1199
2-8
Brazed Design This process uses a ring where the metals are brazed to attach the diaphragm
to the upper housing. This allows the gasket surface area to solidify as it is
melted to the upper housing.
This option is used with Tantalum diaphragm when a metallic gasket is
required.
DIFFERENCES
BETWEEN ELECTRONIC
REMOTE SENSORS AND
CAPILLARY SYSTEMS
Electronic Remote Sensor technology consists of two 3051S pressure
sensors that are connected by an electrical wire, and Differential Pressure is
calculated electronically. Seals are not required, but may still be necessary on
certain applications that include high temperature, corrosive, or viscous
processes. For more information, please refer to the 3051S Series Product
Data Sheet (document number 00813-0100-4801).
Figure 2-6. ERS vs. Capillary
INSTRUMENT TOOLKIT:
SEAL ORDERING AND
APPLICATION PROCESS
Instrument Toolkit is the user’s guide to ensure the selected system will
function properly for the specified application. Toolkit validates model
numbers selected by the user and eliminates specification errors. This
program analyzes each application and calculates the total system
performance. This includes expected head and seal temperature effects and
response times.
THERMAL OPTIMIZER:
PROPER USE AND
APPLICATIONS
The Thermal Optimizer keeps fill fluids from gelling in cold ambient
temperatures by using high process temperatures to heat the transmitter and
capillary.
High Temperature Silicone fill fluid has a low temperature limit in ambient
conditions below 32 °F (0 °C). The Thermal Optimizer allows direct mounting
down to -94 °F (-70 °C).
The Thermal Optimizer is designed for inline transmitters: Rosemount
3051S_T, Rosemount 3051T and Rosemount 2088. Standard 1/2-in. (13 mm)
connection with flanged and threaded seal.
Upper Housing
Diaphragm
Material A
Tantalum
Non-proprietary
electrical cable
Oil-filled Capillary
system

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November 2012
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Rosemount 1199
Figure 2-7. Thermal Optimizer
with Silicone 704 Fill Fluid
Temperature Limits
Thermal Optimizer
Limitations Figure 2-7 shows the process and ambient temperature limits for the Thermal
Optimizer with Silicone 704 Fill Fluid. The shaded area represents the
temperature limitations; applications outside of the shaded area cannot be
used with a Thermal Optimizer.
For example, an application with an ambient temperature of 50 °F (10 °C) and
a process temperature of 300 °F (149 °C) is within the limits, a Thermal
Optimizer can be used in this application.
However, an application with an ambient temperature of 120 °F (40 °C) and a
process temperature of 464 °F (240 °C) is outside of the limits. These high
temperatures would be detrimental to the transmitter electronics.
Figure 2-8. Thermal Optimizer

Reference Manual
00809-0100-4002, Rev BB
November 2012
Rosemount 1199
2-10