Rosemount 1199 User manual

Model 1199
Diaphragm Seal
Systems Manual
00809-0100-4002
English
Rev. AD

Product Manual
The Model 3051C Pressure Transmitter may be protected by one or more of the following U.S. Pat. No.:
4,370,890: 4,612,812; 4,791,352; 4,798,089; 4,818,994; 4,833,922; 4,866,435; 4,926,340; 4,988,990;
5,028,746. MEXICO PATENTADO NO. 154,961. May Depend on Model. Other U.S. and Foreign Patents
Issued and Pending.
The Model 1151 Pressure Transmitter may be protected by one or more of the following U.S. Patent Nos.
3,854,039; 3,975,719; 4,339,750; and Re. 30, 603. Mexico Patentado No. 136,497. May depend on model.
Other foreign patents issued and pending.
The Model 2088 Pressure Transmitter may be protected by the following U.S. Patent Nos.: 4,970,898 and 5,
083,091. May depend on Model. Other U.S. and Foreign Patents Issued and Pending.
Rosemount, the Rosemount logotype, and Alphaline are registered trademarks of Rosemount Inc.
HART is a registered trademark of the HART Communication Foundation.
Tri-Clamp is a registered trademark of Tri-Clover Inc. of the Alfa-Laval Group.
The 3-A symbol is a registered trademark of the 3-A Sanitary Standards Symbol Council.
Grafoil is a trademark of Union Carbide Corp.
Teflon is a registered trademark of E.I. du Pont de Nemours & Co.
Cover Photos: 1199-039AB, 034AB, 051AB, 041AB, 077AB, 074AB, 038AB, 042AB, 063AB.
Fisher-Rosemount satisfies all obligations coming from legislation
to harmonize product requirements in the European Union.
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: 1-800-999-9307 (
7:00 a.m. to 7:00 p.m. CST)
Technical support, quoting, and order-related questions.
North American 1-800-654-7768 ( 24 hours a day – Includes Canada)
Response Center: Equipment service needs.
For equipment service or support needs outside the United States, contact your
local Rosemount 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
Rosemount Sales Representative.
NOTICE
For Western Europe, please contact:
Fisher- Rosemount
Diaphragm Seal Support
Heath Place
Bognor Regis
West Sussex PO229SH
United Kingdom
Tel[phone]
Fax[phone]
For Central and Eastern Europe, please
contact:
Fisher-Rosemount GmbH & Co.
Diaphragm Seal Support
Argelsrieder Feld 7
D-82234 Wessling
Germany
Tel (+49) (0) 8153 27-0
Fax (+49) (0) 8153 27-172
For Asia-Pacific, please contact your local
Fisher Rosemount Representative
Rosemount Inc.
8200 Market Boulevard
Chanhassen, MN 55317 USA
Tel [phone]
Telex 4310012
Fax [phone]
© 1997 Rosemount, Inc.
P
R
I
N
T
E
D
IN
U.
S.
A.
http://www.rosemount.com

Table of Contents
iii
SECTION 1
Introduction Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-1
SECTION 2
Installation Seals Handling and Installation Considerations . . . . . . . . . . . 2-1
Tagging . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-2
Flanged Type Seals: Flush or Extended Diaphragm . . . . . . . . 2-2
Pancake Type Seals . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-3
Threaded Type Seals . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-4
Saddle Type Seals . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-5
In-line Flow-Through Seals . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-5
Sanitary Tank Spud Seals . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-6
Sanitary Flanged Tank Spud Seals . . . . . . . . . . . . . . . . . . . . . . 2-6
Sanitary Tri-Clamp®Seals . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-7
Sanitary Threaded Type Seals . . . . . . . . . . . . . . . . . . . . . . . . . . 2-7
SECTION 3
Calibration Application Considerations . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-1
Zero Suppression . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-1
Zero Elevation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-1
Maximum Span Calculation . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-1
Electronics Considerations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-2
Maximum Span . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-2
Calibrating a One Seal System with Suppressed Zero
(Transmitter Mounted Below the High Side Tap) . . . . . . . . . . 3-3
Calibrating a One-Seal System with Elevated Zero
(Transmitter Mounted Above the High Side Tap) . . . . . . . . . . 3-4
Calibrating a Two-Seal System with Elevated Zero
(Transmitter Mounted Level with, Above, or Below
the High Pressure Tap) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-5
SECTION 4
Maintenance and
Troubleshooting
Cleaning . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-1
Troubleshooting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-1
Return of Materials . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-2

iv

Section
1-1
1Introduction
Introduction A diaphragm seal system consists of a pressure transmitter, a
diaphragm seal, a fill fluid, and either a direct mount or capillary style
connection.
During operation, the thin, flexible diaphragm and fill fluid separate
the pressure sensitive element 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 element. This transferred
pressure displaces the sensing diaphragm in the pressure-sensitive
element of the transmitter. This displacement is proportional to the
process pressure and is converted electronically to an appropriate
current, voltage, or digital HART(Highway Addressable Remote
Transducer) output signal.
This manual is designed to assist in installing, operating, and
maintaining the Rosemount Model 1199 Filled Systems for Pressure
Transmitters. The manual contains supplemental information about
the transmitter/seal system that is not covered in the correlative
transmitter manual.
The information is organized into the following categories:
• Installation
• Calibration
• Maintenance/Troubleshooting
See Product Data Sheets 00813-0100-4016 in North America or
00813-0201-4016 in Europe for more detailed information on specific
Rosemount diaphragm seals.

Model 1199 Diaphragm Seal Systems Manual
1-2

Section
2-1
2Installation
This section contains installation information for various types of
Model 1199 Diaphragm Seals including:
Seals Handling and Installation Considerations
Tagging
Flanged Type Seals
Pancake Type Seals
Threaded Type Seals
Saddle Seals
In-Line Flow-Through Seals
Sanitary Tank Spud Seals
Sanitary Tri-Clamp Seals.
Sanitary Threaded Type Seals
Additional specialized diaphragm seals are available. Contact
Rosemount Diaphragm Seal Support for installation information on
these seals.
Seals Handling and
installation Considerations When unpacking or handling a transmitter/seal system, do not lift the
seal or transmitter by gripping the capillaries.
Avoid sharply bending or crimping the capillary tubing. The minimum
bending radius of the capillary tubing is three inches (8 centimeters).
NOTE
NEVER attempt to disconnect the seals or capillaries from the
transmitter. Doing so will result in loss of fill fluid and will void the
product warranty.
The material of a diaphragm seal is designed to withstand pressure and
wear from process material, but outside of process connection
conditions, diaphragm seals are relatively delicate and should be
handled with care.
The protective cover should remain on the seal until the moment before
installation. Try to avoid touching the diaphragm with fingers or
objects and refrain from setting the diaphragm side of the seal down on
a hard surface. Even minor dents or scratches in the diaphragm
material may impair the performance of the transmitter/seal system.
When installing diaphragm seal systems which employ a gasket or a
gasket and flushing connection ring, make sure the gasket is aligned
properly on the gasket sealing surface.
Most importantly, make sure the gasket does not press down upon the
diaphragm face. Anything pressing on the diaphragm will be read by
the transmitter as pressure. A misaligned gasket may cause a false
reading.

Model 1199 Diaphragm Seal Systems Manual
2-2
Tagging Each diaphragm seal system is tagged in accordance with the customer
requirements. The standard tag is attached to the transmitter/seal
system. Tag is 0.020 in. (0.051cm) thick with 0.125 in. (0.318 cm) high
letters. A sample tag is shown below. 3-A®approved sanitary seal
systems have a 3-A symbol marked on the diaphragm seal.
The Maximum Working Pressure (MWP) of the transmitter/seal system
is stamped on the transmitter neck tag. This is dependent upon the
maximum pressure rating of the seal system or transmitter upper
range limit.
Flanged Type Seals: Flush
or Extended Diaphragm
FIGURE 2-1. Flanged Type Seal.
Bolt Torquing When connecting the process and mating flange, the bolts should be
torqued to the applicable flange requirements. Required torque is a
function of the gasket material and surface treatment of the bolts and
nuts which are customer supplied.
Flushing Connection Ring
Installation The flanged type seals are available with an optional flushing
connection ring (or lower housing.) For certain seal types the flushing
connection ring is supplied with four clips and screws that hold the
diaphragm seal to the lower housing in order to make installation
easier.
Gasket Installation When connecting the diaphragm seal, gasket, and flushing connection
ring make sure the gasket is properly aligned on the gasket sealing
surface.
Mounting
Flange
Upper Housing Capillary Connection
Diaphragm
Flushing Connection
Ring (Lower Housing)
Gasket
Process Side
Mounting Clip
3051A23C 1199-0561A01A

2-3
Installation
Pancake Type Seals
FIGURE 2-2. Pancake Type Seal.
Capillary Support Tube A common option for the Pancake type seal is the capillary support
tube. Due to the side capillary-to-seal connection, the support tube
provides a handle for aligning the Pancake seal during installation. The
support tube should not be used for supporting any weight.
Blind Flange Rosemount offers the option of supplying the blind flange, otherwise the
blind flange is furnished by the customer. For certain pancake seal
assemblies, the Rosemount supplied blind flange has a machined hole
through the center of the flange. This hole corresponds to a threaded
connection in the back of the pancake seal upper housing. The flange
can, therefore be connected to the seal prior to installation to make
handling easier.
Bolt Torquing When connecting the process and mating flange, the bolts should be
torqued to the applicable flange requirements. Required torque is a
function of the gasket material and surface treatment of the bolts and
nuts which are customer supplied.
Flushing Connection Ring
Installation The Pancake type seals are available with an optional flushing
connection ring (or lower housing). For certain seal types the flushing
connection ring is supplied with four clips and screws that attach the
diaphragm seal to the lower housing in order to make installation
easier.
Gasket Installation When connecting the diaphragm seal, gasket, and flushing connection
ring make sure the gasket is properly aligned on the gasket sealing
surface.
Customer Process
Connection Flange
Flushing Connection
Ring
(Lower Housing) Capillary
Connection
Upper
Housing
Blind Flange
Gasket
Process Side
3051-3031E23B

Model 1199 Diaphragm Seal Systems Manual
2-4
Threaded Type Seals
FIGURE 2-3. Female Threaded Type
Seal.
Lower Housing Installation
Procedure The threaded seal is preassembled at the factory; meaning the upper
housing and lower housings are bolted together at the required torque
specifications. The lower housing of the diaphragm seal has either a
male or female thread connection for attachment to a process pipe
nipple. When threading the lower housing to the process pipe, care
should be taken not to overtighten. The applied torque should comply to
ANSI B1.20.1 or applicable torque requirements for pipe connections.
Upper Housing Installation The threaded seal is supplied with carbon steel, 304 SST, or 316 SST
bolts and nuts. The torque specifications for the bolts attaching the
upper and lower seal housing are specified on the seal torque label for
certain seal types. The torque specifications for the RTW seal is a
minimum of 135 in-lbs (15 N-m), for all bolt materials.
Gasket Installation Threaded seals with flushing connection rings come with a sealing
gasket. When connecting the diaphragm seal, gasket, and flushing
connection ring make sure the gasket is properly aligned on the gasket
sealing surface.
Alternative System Installation
Procedure An alternative to threading the entire transmitter/seal system to the
process piping is to unbolt the seal upper and lower housing and thread
the lower housing to the hard piping separately. Bolt the upper and
lower housings together to the required torque specification.
Note that certain gaskets, such as Grafoil™of Teflon®(PTFE), need to
be replaced once they have been torqued. Thus this alternative system
installation procedure may require gasket replacement.
Mounting
Ring
Flushing
Connection
(Lower Housing)
Gasket
NPT Process
Connection
Diaphragm
Process Side Bolts
3051-3031D23B
Upper
Housing Capillary
Connection

2-5
Installation
Saddle Type Seals
FIGURE 2-4. Saddle Type Seal.
Lower Housing Installation The lower housing is welded directly into the process pipe. The upper
housing must be removed from the system when welding the lower
housing into the process pipe. Allow the pipe connection to cool before
installing the seal upper housing.
Upper Housing Installation The torque specifications for the saddle seal upper housings are
360 in-lbs (40 N-m) with carbon steel bolts or 180 in-lbs (20 N-m) with
stainless steel bolts. As it is necessary for the customer to torque the
upper housing bolts during installation, each saddle seal includes a
torque label with the specified torque.
Gasket Installation The saddle comes standard with a sealing gasket. When connecting the
upper and lower housings make sure the gasket is aligned properly on
the gasket sealing surface.
In-line Flow-Through Seals
FIGURE 2-5. In-line FlowThrough Seal
with Threaded Connection.
Handling Care should be taken to ensure the seal diaphragm is not dented or
damaged during seal installation. The diaphragm seal protective covers
should remain on the seal until just prior to installation.
Connection Styles The in-line flow-through seal is attached to the process piping by either
flange, clamp or male threaded connections.
Flanged Type Connection The flanged process connection sandwiches the flow-through seal
between two process flanges,either direct welded to the seal or supplied
loosely. The bolts should be torqued to the specifications outlined by
ANSI B16.5 or applicable flange torque requirements. Required torque
is a function of the gasket material and surface treatment of the bolts
and nuts, which are customer supplied.
Clamp Type Connection The clamp connection provides a sanitary fitting that attaches the flow-
through seal to the process piping by two sanitary Tri-Clamp clamps.
Threaded Type Connection The male threaded process connection allows the in-line seal to be
threaded into the female process piping according to DIN 11851, SMS,
IDF, or RJT standards.
Customer Weld
Lower
Housing
Diaphragm
Upper
Housing
Customer Pipe
Process Side
Capillary Connection
Threaded Type
Process
Connection Diaphragm
1199-9004A03A
1199-0000C12B

Model 1199 Diaphragm Seal Systems Manual
2-6
Sanitary Tank Spud Seals
FIGURE 2-6. Sanitary Tank Spud and
Sanitary Tank Spud Seal.
Sanitary Flanged Tank
Spud Seals
FIGURE 2-7. Sanitary Flanged Type
Tank Spud Seal.
Sanitary Approvals Rosemount supplied 3-A approved sanitary seals have a 3-A symbol
marked on the diaphragm seal.
Clamp Style Tank Spud For clamp style tank spud seals the procedures for welding the tank
spud to the tank vessel are shipped with the tank spud. For the welding
procedure refer to Manual Supplement MAN 4016-1.
The clamp and O-ring is provided with the tank spud seal. Attach the
clamp and hand-tighten the connection.
Flange Style Tank Spud When connecting the process and mating flange, the bolts should be
torqued to the specifications outlined by ANSI B16.5 or applicable
flange requirements.
Tank Spud
Diaphragm
Gasket Sealing Surface
Capillary
Connection
Clamp
Connection
1199-0000A03B
Diaphragm
Gasket Sealing Surface
Capillary
Support
Tube
Mounting Flange
Process Side
3051-3031A26B,F26E
Process Side

2-7
Installation
Sanitary Tri-Clamp®Seals
FIGURE 2-8. Sanitary Tri-Clamp
Diaphragm Seal.
Sanitary Approvals Rosemount supplied 3-A approved sanitary seals have a 3-A symbol
marked on the diaphragm seal.
Clamp and Gasket The clamp and gasket are furnished by user, unless specified by
customer. Maximum pressure rating of the system is dependent upon
the clamp device, for high pressure clamps up to 1,000 psi
(69 bar) contact the factory. To install, attach and hand tighten the
clamp.
Sanitary Threaded Type
Seals
FIGURE 2-9. Sanitary Threaded Type
Seals, Dairy Process Connections.
Installation Threaded sanitary seals need to be installed following the installation
instructions for the respective DIN 11851, SMS, RJT, or IDF couplings.
Customer
Gasket, Clamp
and Connection
Diaphragm
Process Side
Capillary
Connection
Diaphragm
Male Threads
Process Side
Fill Screw
3051-3031F26B
1199-

Model 1199 Diaphragm Seal Systems Manual
2-8

Section
3-1
3Calibration
APPLICATION
CONSIDERATIONS Diaphragm seal installations frequently require transmitters to be calibrated with
suppressed or elevated zeroes. For more extensive calibration information see the
applicable transmitter manual.
Zero suppression A suppressed zero is needed when a gage or absolute pressure transmitter is
mounted below the high side tap (the bottom process connection). When the
transmitter is mounted below the high side tap, the fill fluid in the capillary puts
pressure on the transmitter sensor causing it to give a positive pressure reading
even when the tank is empty.
Zero elevation Conversely, an elevated zero is needed for a gage or absolute transmitter mounted
above the high side tap (the bottom process connection) or for a two seal differential
pressure application. In these cases, the transmitter reads a negative pressure
when the tank is empty, due to the head pressure effect of the capillary fill fluid.
Maximum Span
Calculation Example 1 calculates the maximum amount of zero elevation or suppression for a
transmitter of a specific range. The results of the calculation will help in
determining the mounting location for the transmitter.
Example 1
Mounting Considerations for a Model 3051 Range 2 Transmitter/Seal System.
Maximum height of process fluid (H) = 65 inches (165 cm)
Specific gravity of the process fluid (sp) = 1.0 inH2O/inch,
(ρp)= (1 000 kg/cm3)
Transmitter Lower Range Limit (LRL) = -250 inH2O (- 620 mbar)
Transmitter Upper Range Limit (URL) = 250 inH2O (620mbar)
Specific gravity of the (Inert) capillary fill fluid (sf) = 1.85 inH2O/inch
rf= (1 850 kg/m3)
Gravity Constant (g) for SI Units: 9,81 m/s2
American Units URL > (h) (sf) + (H) (sp) > LRL
250 inH2O > (h) (1.85 inH2O/inch) + (65 inches) (1.0 inH20/inch) > -250
185 inH2O > (h) (1.85 inH2O/inch) > -315 inH2O
100 inches > (h) > -170 inches
Step 4
Step 1
Step 2
Step 3

Model 1199 Diaphragm Seal Systems Manual
3-2
SI Units
Step 3
= 2,6 meters > h > 4,2 meters
NOTE
where:
(h) is the distance between the transmitter and the high pressure
tap. (h) is positive if the transmitter is mounted below the high
pressure tap and is negative if it is mounted above the tap. In this
case for a:
One Seal System Suppressed Zero (transmitter mounted below
the high pressure tap)
Do not mount the transmitter below the seal more than 100 inches
(2,6 meters) below the seal.
One Seal System Elevated Zero (transmitter mounted above the
high pressure tap)
Do not mount the transmitter more than 170 inches (4,2 meters)
above the seal.
Two Seal System Elevated Zero (independent of transmitter
location)
If it is necessary to measure an empty tank condition, the distance
between the seal taps should not exceed 170 inches (4,2 meters).
Electronics
Considerations Zero elevation and suppression must be such that the lower range value
does not exceed the transmitter lower range limit (LRL), and the upper
range value is less than or equal to the transmitter upper range limit
(URL). The calibrated span must be greater than or equal to the minimum
span.
Maximum Span For applications in which the transmitter is mounted above or below the
high pressure tap, be sure the calibrated span does not exceed the
transmitter minimum and maximum span limits.
URL ρfgh ρpgH⋅⋅+⋅⋅ LRL>>
620 mbar()h981,1850
100
------------- mbar
m
-----------------


15m,()981,1000
100
------------- mbar
m
-----------------


⋅⋅+⋅⋅ 620–mbar()>>
620 mbar()h981,185
mbar
m
-----------------


,15m,()981 10mbar
m
-----------------


⋅,⋅+⋅⋅ 620 mbar()–>>
620 147–()mbar()
182 mbar
m
-----------------


------------------------------------------------------h 620–147–()mbar()
182 mbar
m
-----------------


---------------------------------------------------------->>
1mbar
100
----------------------- 1kg m
3
⁄()1m s
2
⁄()1m()⋅⋅1N m
2
⁄==
NOTE
For the Model 3051 and 1151 Smart Transmitters, the maximum span
equals the difference between the upper and lower range limits.
For example, a Model 3051CD2 (Range Code 2) transmitter that has
an upper range limit of 250 inH2O (620 mbar) and a lower range limit
of –250 inH2O (- 620 mbar) has a maximum span capability of 500
inH2O (1,24 bar).
Step 4
Step 2
Step 1

3-3
Calibration
FIGURE 3-1. Transmitter Mounted Below the High Side Tap.
1. Calculate the amount of zero suppression by multiplying the
distance between the process connection and the transmitter (h) by
the fill fluid specific gravity (sf).
American Units Zero Suppression= (h)(sf)
= (40 inches) (0.93 inH2O/inch) = 37.2 inH2O
2. Calculate the span by multiplying the maximum process fluid
height (H) by the specific gravity of the process liquid (sp).
Step 2 Span = (H)(sp)
= (120 inches) (1.2 inH2O/inch) = 144 inH2O
3. Calibrate the transmitter using the following equation:
Step 3 Calibration = Zero Suppression to (Zero Suppression + Span)
= 37.2 to (37.2 + 144 inH2O)
Step 4 = 37.2 to 181.2 inH2O
SI Units
Calibration
Summary Therefore, in this example, a Model 3051C Range 2, URL = 250 inH2O
(620 mbar), Model 1151Range 5, URL = 750 inH2O (1,9 mbar), or Model
2088 Range 0, URL = 220 inH2O (550 mbar) transmitter is required.
NOTE
Calibrating a One Seal System With Suppressed Zero
(Transmitter Mounted Below the High Side Tap)
H
h
Given:
DC 200 fill fluid
(sf) = 0.93 in H2O/inch
(h) = 40 inches
(sp) = 1.2 in H2O/inch
(H) = 120 inches
Given:
Fill fluid
(rf) = 930 kg/m3
(h) = 1 meter
(rp) = 1 200 kg/m3
(H) = 3 meters
(g) = 9,81 m/s2
4mA
20mA
Zero Suppression ρfgh⋅⋅ 930 9 81,1
100
---------mbar⋅⋅ 91 2,mbar== =
Span H ρpg⋅⋅ 3
100
---------1200 9 81 mbar,⋅⋅ 353 mbar== =
4mA Zero Suppression
91 2 mbar,
==
20m
A
Zero Suppression= Span+
91 2 mbar, 353 mbar+=
444 2 mbar,
=
1mbar
100
-----------------------1kg m
3
⁄()1m s
2
⁄()1m()⋅⋅1N m
2
⁄==
1199-0160J
Step 1
Step 2
Step 3
Step 1

Model 1199 Diaphragm Seal Systems Manual
3-4
FIGURE 3-2. Transmitter Mounted Above a Single Seal.
American Units 1. Calculate the amount of zero elevation by multiplying the height of
the transmitter above the process connection (-h) by the specific
gravity of the fill fluid (sf).
Zero Elevation = (-h)(sf)
= (-30 inches) (1.9 inH2O/inch) = -57 inH2O
Step 2 2. Calculate the transmitter span by multiplying the maximum height
of the process fluid (H) by the specific gravity of the process liquid
(sp).
Span = (H)(sp)
= (120 inches) (1.1 inH2O/inch) = 132 inH2O
Step 3 3. Calibrate the transmitter using the following equation:
Calibration = Zero Elevation to (Zero Elevation + Span)
= -57 inH2O to (-57 + 132 inH2O)
Step 4 = -57 inH2O to 75 inH2O
SI Units
Calibration:
Summary Therefore, in this example, a Model 3051CG Range 2,
URL = 250 inH2O (620 mbar), Model 1151 Range 4,
URL = 150 inH2O (375 mbar), or Model 2088 Range 0,
URL = 220 inH2O (550 mbar) transmitter is required.
NOTE
Calibrating a One-Seal System With Elevated Zero
(Transmitter Mounted Above the High Side Tap)
Transmitter
-h
Given:
Inert fill fluid
(sf) = 1.9 in H2O/inch
(-h) = -30 inches
(sp) = 1.1 in H2O/inch
(H) = 120 inches
H
Given:
Inert fill fluid
(rf) = 1850 kg/m3
(-h) = 0,75 m
(rp) = 1 100 k/m3
(H) = 3 m
(g) = 9,81 m/s2
20 mA
4 mA
Zero Elevation ρfgh⋅⋅–=
1850 9 81,0
75
,
100
------------ mbar⋅⋅–=
136 mbar–=
Span ρpgH⋅⋅=
1100 9 81,3
100
---------mba
r
⋅⋅=
324 mbar=
4mA Zero Elevation
136 mbar
–==
20mA Zero Elevation Span+
136 324 mbar
+–==
188 mbar
=
1mbar
100
-----------------------1kgm
3
⁄()1m s
2
⁄()1m()⋅⋅1N m
2
⁄==
1199-0160k
Step 2
Step 3
Step 1
Step 2