Rosemount 2088 User manual

www.rosemount.com
Reference Manual
00809-0100-4690, Rev EA
March 2007
Rosemount 2088, 2090P, and 2090F
Pressure Transmitters

Reference Manual
00809-0100-4690, Rev EA
March 2007 Rosemount 2088 and 2090
www.rosemount.com
Rosemount 2088, 2090F and
2090P Pressure Transmitter
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: 1-800-999-9307 (7:00 a.m. to 7:00 p.m. CST)
Technical support, quoting, and order-related questions.
North American1-800-654-7768 (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.

Reference Manual
00809-0100-4690, Rev EA
March 2007
TOC-1
Rosemount 2088 and 2090
SECTION 1
Introduction
Using this Manual . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-1
Safety Messages . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-2
SECTION 2
Commissioning
the Transmitter
Overview. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-1
Safety Messages . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-1
Warnings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-1
Commission: On the Bench or In the Loop. . . . . . . . . . . . . . . . . . . . . 2-2
Commissioning the Smart Transmitter . . . . . . . . . . . . . . . . . . . . . . . . 2-2
Set up the Smart Transmitter and the Communicator . . . . . . . . . . 2-2
Review Configuration Data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-2
Review . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-3
Check Output . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-3
Process Variables . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-3
Basic Setup. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-3
Tag . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-3
Output Units. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-3
Rerange. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-4
Damping . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-4
Detailed Setup . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-5
Meter Setup . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-5
Burst Mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-5
Save, Recall, or Clone Configuration Data . . . . . . . . . . . . . . . . . . 2-5
Enable or Disable Local Span and Zero Buttons. . . . . . . . . . . . . . 2-6
Calibration. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-6
Calibration Overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-6
Sensor Trim . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-7
Output Trim . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-9
Diagnostics and Service . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-11
Multidrop Communication . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-11
SECTION 3
Installation
Overview. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-1
Safety Messages . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-1
Warnings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-2
General Considerations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-4
Environmental Considerations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-4
Temperature . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-4
Moisture and Corrosives . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-4
Hazardous Locations Installations. . . . . . . . . . . . . . . . . . . . . . . . . 3-4
Mechanical Considerations. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-5
Mounting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-5
Rosemount 2088 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-5
Rosemount 2090P. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-5
Rosemount 2090F . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-5
Impulse Piping . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-6
Access Requirements . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-7
Rosemount 2090P. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-9
Rosemount 2090F . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-11
Table of Contents

Reference Manual
00809-0100-4690, Rev EA
March 2007
Rosemount 2088 and 2090
TOC-2
Electrical Considerations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-11
Power Supply . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-11
Field Wiring. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-12
Failure Mode and Security Jumpers . . . . . . . . . . . . . . . . . . . . . . . . . 3-13
Failure Mode. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-13
Jumper Locations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-13
Transmitter Security . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-14
Zero and Span Adjustments . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-15
Rerange Procedure . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-15
SECTION 4
Maintenance and
Troubleshooting
Safety Messages . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-1
Troubleshooting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-3
Downscale Alarm. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-5
Disassembly Procedure. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-5
Reassembly Procedure . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-6
Returning Rosemount Products and/or Materials . . . . . . . . . . . . . . . . 4-6
SECTION 5
Specifications and
Reference Data
Overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-1
Functional Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-1
Performance Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-4
Physical Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-6
Spare Parts . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-7
Ordering Information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-10
Calibration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-12
Tagging . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-12
APPENDIX A
LCD Meter
LCD Meter . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . A-1
Safety Messages . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . A-1
Warnings () . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . A-1
Custom Meter Configuration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . A-2
Diagnostic Messages. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . A-3
Error . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . A-3
Warnings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . A-4
Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . A-4
APPENDIX B
Rosemount 275 HART
Communicator
Overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . B-1
Safety Messages . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . B-1
Warnings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . B-1
Connections and Hardware . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . B-4
Communicator Keys . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . B-5
Action Keys. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . B-6
Function Keys. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . B-6
Alphanumeric and Shift Keys . . . . . . . . . . . . . . . . . . . . . . . . . . . . . B-6
Data Entry. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . B-7
Fast Key Sequences . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . B-7
Menus and Functions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . B-8
Main Menu . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . B-8
Online Menu . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . B-8
Diagnostic Messages . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . B-9

Reference Manual
00809-0100-4690, Rev EA
March 2007
TOC-3
Rosemount 2088 and 2090
APPENDIX C
Rosemount 2088
Low Power Option
Overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .C-1
Safety Messages . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .C-1
Commissioning the Transmitter . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .C-2
Installation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .C-2
Wiring. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .C-2
Calibration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .C-3
Selector Switch. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .C-3
Potentiometer Adjustment . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .C-4
Setting the Zero . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .C-4
Setting the Span . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .C-5
Transient Protection Option . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .C-6
Installation Procedures . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .C-6
Transient Protection Board Installation. . . . . . . . . . . . . . . . . . . . . .C-6
Transient Protection Board Wiring . . . . . . . . . . . . . . . . . . . . . . . . .C-7
Specifications. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .C-8
Functional Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .C-8
Performance Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .C-8
APPENDIX D
Approval Drawings
Overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .D-1
APPENDIX E
European ATEX Directive
Information

Reference Manual
00809-0100-4690, Rev EA
March 2007
Rosemount 2088 and 2090
TOC-4

Reference Manual
00809-0100-4690, Rev EA
March 2007 Rosemount 2088 and 2090
www.rosemount.com
Section 1 Introduction
Using this Manual . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . page 1-1
Safety Messages . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . page 1-2
USING THIS MANUAL This manual provides information on commissioning, installing, and operating
the Rosemount 2088, 2090P, and 2090F Pressure Transmitters. The manual
is organized into the following sections:
Section 2: Commission the Transmitter
provides information on commissioning and operating the transmitters,
software functions, configuration parameters, and on-line variables.
Section 3: Installation
provides mechanical and electrical installation instructions.
Section 4: Maintenance and Troubleshooting
provides basic troubleshooting instructions, including sensing module
checkout, disassembly, and reassembly procedures.
Section 5: Specifications and Reference Data
provides functional specifications, physical specifications, performance
specifications, for the Rosemount 2088, 2090P, and 2090F Pressure
Transmitters.
Appendix A: LCD Meter
provides operating instructions for the optional LCD meter.
Appendix B: 275 HART Communicator
contains a communicator overview, a HART Communicator menu tree for the
Rosemount 2088 Smart, and a table of HART Communicator fast key
sequences. A table of diagnostic messages associated with this
communicator is also included.
Appendix C: Low Power Option
provides installation and calibration information specific to the Low Power
Option.
Appendix D: Transient Protection Option
provides installation, wiring, and specification information for the transient
protection option

Reference Manual
00809-0100-4690, Rev EA
March 2007
Rosemount 2088 and 2090
1-2
Appendix E: Approval Drawings
provides the drawings necessary to install the transmitter in
hazardous location.
Appendix F: European ATEX Directive Information
provides information on European ATEX compliance.
SAFETY MESSAGES Procedures and instructions in this manual may require special precautions to
ensure the safety of the personnel performing the operations. Information that
raises potential safety issues is indicated by a warning symbol ( ). Refer to
the safety messages, listed at the beginning of each section, before
performing an operation preceded by this symbol.

Reference Manual
00809-0100-4690, Rev EA
March 2007 Rosemount 2088 and 2090
www.rosemount.com
Section 2 Commissioning the Transmitter
Overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . page 2-1
Safety Messages . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . page 2-1
Commission: On the Bench or In the Loop . . . . . . . . . . . page 2-2
Commissioning the Smart Transmitter . . . . . . . . . . . . . . . page 2-2
Review Configuration Data . . . . . . . . . . . . . . . . . . . . . . . . page 2-2
Check Output . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . page 2-3
Basic Setup . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . page 2-3
Detailed Setup . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . page 2-5
Calibration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . page 2-6
Diagnostics and Service . . . . . . . . . . . . . . . . . . . . . . . . . . page 2-11
Multidrop Communication . . . . . . . . . . . . . . . . . . . . . . . . . page 2-11
OVERVIEW This section contains information on commissioning the transmitter.
Commissioning involves reviewing configuration data, setting the 4 and 20
mA points, configuring the transmitter to recognize accessories such as an
LCD meter, and testing the transmitter output.
SAFETY MESSAGES This section contains procedures that require connecting a communicator to
the transmitter, or making connections in an explosive atmosphere. The
following safety messages apply to all procedures throughout this section
requiring cover removal and communicator or ammeter connection to the
transmitter terminal block. Keep the following safety messages in mind
whenever you perform an operation requiring cover removal or the connection
of a communicator or other device to a measurement loop.
Warnings
Explosions could result in death or serious injury:
• Do not remove the transmitter covers in explosive atmospheres
when the circuit is alive.
• Before connecting a HART-based communicator in an explosive atmosphere,
make sure the instruments in the loop are installed in accordance with
intrinsically safe or non-incendive field wiring practices.
• Both transmitter covers must be fully engaged to meet
explosion-proof requirements.
High voltage that may be present on leads could cause electrical shock:
• Avoid contact with leads and terminals.

Reference Manual
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March 2007
Rosemount 2088 and 2090
2-2
COMMISSION: ON THE
BENCH OR IN THE LOOP
Commission the Rosemount 2088 Transmitter before or after installation. It
may be useful to commission the transmitter on the bench before installation
to ensure proper operation, to familiarize yourself with transmitter
functionality, and to avoid exposing the transmitter electronics to the plant
environment.
Commissioning consists of:
• Reviewing configuration data
• Setting output units
• Setting the 4 and 20 mA points
• Configuring the transmitter for any non-standard accessories or
functions, and testing the transmitter output
COMMISSIONING THE
SMART TRANSMITTER
Set up the Smart
Transmitter and the
Communicator
To configure the smart transmitter on the bench, connect the transmitter and
the communicator as shown in Figure 2-1. To power the transmitter you will
need a power supply capable of providing 10.5 to 36.0 V dc and a meter to
measure output current. To enable communication, a resistance of at least 250
ohms must be present between the communicator loop connection and the
power supply. You can connect the communicator leads at any termination
point in the signal loop, but it is most convenient to connect them to the
terminals labeled “COMM” on the terminal block.
After you connect the bench equipment as shown in Figure 2-1, turn on the
communicator by pressing the ON/OFF key. The communicator will search for
a HART-compatible device and will indicate when the connection is made. If
the connection is not made, the communicator will indicate that no device was
found.
Figure 2-1. Connecting
a HART Communicator to
a Transmitter Loop
.
REVIEW
CONFIGURATION DATA
Review all of the factory-set configuration data to ensure that it reflects the
needs of your application before operating the transmitter in an actual
installation.
Power
Supply
RL≥ 250 
The signal loop may be grounded
at any single point in the loop, or
may be left ungrounded

Reference Manual
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March 2007
2-3
Rosemount 2088 and 2090
Review Review the transmitter configuration parameters set at the factory to ensure
accuracy and compatibility with your particular application. After activating the
review function, scroll through the data list to check each variable. Refer to
“Basic Setup” in this section of the manual if a change to the transmitter
configuration data is necessary.
CHECK OUTPUT Before performing other transmitter on-line operations, review the digital
output parameters to ensure that the transmitter is operating properly and is
configured to the appropriate process variables.
Process Variables
The process variables for the Rosemount 2088 provide the transmitter output,
and are continuously updated. The Process Variables menu displays the
following process variables:
• Pressure
• Percent Range
• Analog Output
BASIC SETUP From the Basic Setup menu you can configure the transmitter for certain
basic variables. In many cases, all of these variables are pre-configured at the
factory. Configuration may be required if your transmitter is not configured or if
the configuration variables need revision.
Tag The Tag variable is the easiest way to identify and distinguish between
transmitters in multi-transmitter environments. Use this variable to label
transmitters electronically according to the requirements of your application.
The tag you define is automatically displayed when a HART-based
communicator establishes contact with the transmitter at power-up. The tag
may be up to eight characters long and has no impact on the primary variable
readings of the transmitter.
Output Units The Unit command sets the desired primary variable units. Set the transmitter
output to one of the following engineering units:
NOTE
After changing units, press SEND (F2) so the microprocessor will recalculate
the associated variables (4–20 mA points, for example). The Rosemount
2088 Smart recalculates all variables that depend on units. After the
transmitter recalculates the variables, you may change any of the remaining
parameters.
HART Fast Keys 1, 5
HART Fast Keys 1, 1
HART Fast Keys 1, 3, 1
HART Fast Keys 1, 3, 2 inH20 g/cm2
inHg kg/cm2
ftH20Pa
mmH20kPa
psi torr
bar atm
mbar mmH20 @ 4 °C
nH2O @ 4 °C

Reference Manual
00809-0100-4690, Rev EA
March 2007
Rosemount 2088 and 2090
2-4
Rerange The Range Values command sets the 4 and 20 mA points (lower and upper
range values). Setting the range values to the limits of expected readings
maximizes transmitter performance; the transmitter is most accurate when
operated within the expected pressure ranges for your application. In practice,
you may reset the transmitter range values as often as necessary to reflect
changing process conditions.
NOTE
Regardless of the range points, the Rosemount 2088 Smart will measure and
report all readings within the digital limits of the sensor. For example, if the 4
and 20 mA points are set to 0 and 10 inH20, and the transmitter detects a
pressure of 25 inH20, it digitally outputs the 25 in H20 reading and a 250%
percent of span reading. However, there may be up to ±5.0% error associated
with output outside of the range points.
You may use one of three methods to rerange the transmitter. Each method is
unique; examine all three closely before deciding which method to use.
Method 1: Rerange Using the Communicator
Reranging using only the communicator is the easiest and most popular way
to rerange the transmitter. This method changes the values of the analog 4
and 20 mA points independently without a pressure input.
To rerange using only the communicator enter the fast-key sequence above,
select 1 Keypad input, and follow the on-line instructions. Or enter the values
directly from the HOME screen.
Method 2: Rerange Using the Communicator and a Pressure Source or
Process Pressure
Reranging using the communicator and a pressure source or process
pressure is a way of reranging the transmitter when specific 4 and 20 mA
points are not known. This method changes the values of the analog 4 and 20
mA points. When you set the 4 mA point the span is maintained; when you set
the 20 mA point the span changes.
To rerange using the communicator and a pressure source or process
pressure enter the fast-key sequence above, select 2 Apply values, and follow
the on-line instructions.
Method 3: Rerange Using the Local Zero and Span Buttons
and a Pressure Source or Process Pressure
Reranging using the local zero and span adjustments and a pressure source
is a way of reranging the transmitter when specific 4 and 20 mA points are not
known and a communicator is not available. When you set the 4 mA point the
span is maintained; when you set the 20 mA point the span changes.
Damping The Damping command changes the response time of the transmitter to
smooth variations in output readings caused by rapid changes in input.
Determine the appropriate damping setting based on the necessary response
time, signal stability, and other requirements of the loop dynamics of your
system. The default damping value is 0.50 seconds and can be reset in fixed
increments of 0.05, 0.10, 0.20, 0.40, 0.80, 1.60, 3.20, 6.40, 12.8, or 25.6
seconds.
HART Fast Keys 1, 3, 3
HART Fast Keys 1, 3, 5

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March 2007
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Rosemount 2088 and 2090
DETAILED SETUP
Meter Setup The Meter Type command allows you to configure the transmitter for use with
an LCD meter. Transmitters shipped without meters are set to “NONE.”
Change the meter settings as often as necessary to reflect changing process
or application conditions. To change the meter settings, and thereby configure
the transmitter to recognize the LCD meter, perform the following procedure.
1. Select 1 Device setup, 3 Basic setup, 6 Meter type to prepare to
change the meter settings.
2. Select the appropriate variable configuration from the “Meter type”
screen, and press enter.
NOTE
Selecting “None” from the meter type screen will disable the meter.
3. Select SEND to download the new meter configuration information to
the transmitter.
For a more detailed description of the LCD meter features and diagnostic
messages, refer to “LCD Meter” on page A-1.
Burst Mode Burst Mode sets the transmitter to maintain digital contact with a Digital
Control System that has custom software to support burst mode. When the
Rosemount 2088 Smart is configured for burst mode, it provides faster digital
communication from the transmitter to the control system by eliminating the
time required for the control system to request information from the
transmitter.
Burst mode is compatible with use of the analog signal. Because HART®
protocol features simultaneous digital and analog data transmission, the
analog value can drive other equipment in the loop while the control system is
receiving the digital information. Burst mode applies only to the transmission
of dynamic data (pressure and temperature in engineering units, pressure in
percent of range, and/or analog output in mA), and does not affect the way
other transmitter data is accessed.
Access to information other than dynamic transmitter data is obtained through
the normal poll/response method of HART communication. A HART-based
communicator or the control system may request any of the information that is
normally available while the transmitter is in burst mode. Between each
message sent by the transmitter, a short pause allows the HART-based
communicator or a control system to initiate a request. The transmitter will
receive the request, process the response message, and then continue
“bursting” the data approximately three times per second.
Save, Recall, or Clone
Configuration Data
Data that was entered off-line can be stored in the communicator memory and
downloaded to other transmitters later. Data also can be copied from a
transmitter in order to be sent to other transmitters in a process known as
“cloning”. This is especially useful if you work with a large number of
transmitters that require the same configuration data.
HART Fast Keys 1, 3, 6
HART Fast Keys 1, 4, 3, 3, 3
HART Fast Keys left arrow, 3 (note)

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March 2007
Rosemount 2088 and 2090
2-6
Enable or Disable Local
Span and Zero Buttons
The Local Keys command allows you to enable or disable the local span and
zero buttons. Disabling the local keys will prevent unauthorized reranging
using the span and zero buttons, but will not prevent reranging using the
communicator. To prevent all changes to the configuration data, use the
transmitter security jumper (see “Transmitter Security” on page 3-14).
CALIBRATION Calibrating the transmitter increases the precision of your measurement
system. You may use one or more of a number of trim functions when
calibrating.
To understand the trim functions, it is necessary to understand that smart
transmitters operate differently from analog transmitters. An important difference
is that smart transmitters are factory-characterized; they are shipped with a
standard sensor curve stored in the transmitter firmware. In operation, the
transmitter uses this information to produce a process variable output, in
engineering units, dependent on the sensor input. The trim functions allow
you to make corrections to the factory-stored characterization curve by
digitally altering the transmitter’s interpretation of the sensor input.
The trim functions should not be confused with the rerange functions.
Although the rerange command matches a sensor input to a 4–20 mA
output—as in conventional calibration—it does not affect the transmitter’s
interpretation of the input.
Calibration Overview Complete calibration of the Rosemount 2088 Smart Pressure Transmitter
involves one or more of the following tasks:
Configure the Analog Output Parameters
• Set Process Variable Units (page 2-3)
• Rerange (page 2-4)
• Set Output Type (page 2-3)
• Set Damping (page 2-4)
Calibrate the Sensor
• Full Trim (page 2-8)
• Zero Trim (page 2-8)
Calibrate the 4–20 mA Output
• Digital to Analog Trim (page 2-10) or
• Scaled Digital to Analog Trim (page 2-10)
Figure 2-2 illustrates the Rosemount 2088 Smart Pressure Transmitter data
flow. This data flow can be summarized in four major steps:
1. A change in pressure is measured by a change in the sensor output
(Sensor Signal).
2. The sensor signal is converted to a digital format that can be
understood by the microprocessor (Analog-to-Digital Signal
Conversion).
3. Corrections are performed in the microprocessor to obtain a digital
representation of the process input (Digital PV).
4. The Digital PV is converted to an analog value
(Digital-to-Analog Signal Conversion).
HART Fast Keys 1, 4, 3, 3, 3

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March 2007
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Rosemount 2088 and 2090
Figure 2-2. Transmitter Data
Flow with Calibration Options
Deciding Which Trim Procedure to Use
To decide which trim procedure to use, you must first determine whether the
analog-to-digital section or the digital-to-analog section of the transmitter
electronics is in need of calibration. To do so, refer to Figure 2-2 and perform
the following procedure:
1. Connect a pressure source, a HART communicator, and a digital
readout device to the transmitter.
2. Establish communication between the transmitter
and the communicator.
3. Apply pressure (100 in H20, for example).
4. Compare the applied pressure to the Process Variable (PV) line on
the Communicator Online Menu. If the PV reading on the
communicator does not match the applied pressure, and you are
certain your test equipment is accurate, perform a sensor trim.
5. Compare the Analog Output (AO) line on the communicator online
menu to the digital readout device. If the AO reading on the
communicator does not match the digital readout device, and you are
certain your test equipment is accurate, perform an output trim.
Sensor Trim You can trim the sensor using either the full trim or the zero trim function. The
trim functions vary in complexity, and their use is application-dependent. Both
alter the transmitter’s interpretation of the input signal.
Transmitter Electronics Module
Microprocessor
Digital PV
Sensor
Input Device Output Device
20.00 mA
2088s:PT-4763
1 ➡Device Setup
Online
2PV100.00 inH2O
3AO20.00 mA
4LRV0.00 inH2O
5URV100.00 inH2O
Transmitter Ranged 0 to 100 inH2O
Input
Pressure
Sensor
Signal
Analog Output
HART
Communicator
NOTE
Value on PV line should equal
the input pressure. Value on
AO line should equal the
output device reading.

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March 2007
Rosemount 2088 and 2090
2-8
Zero Trim
AZero Trim is a single-point adjustment. It is useful for compensating for
mounting position effects, and is most effective when performed with the
transmitter installed in its final mounting position. Since this correction
maintains the slope of the characterization curve, it should not be used in
place of a full trim over the full sensor range.
NOTE
Use full trim on absolute transmitters; do not use zero trim.
To calibrate the sensor using the Zero Trim function, perform the following
procedure.
1. Vent the transmitter and attach a communicator to the measurement
loop.
2. From the communicator main menu select 1 Device setup,
2 Diagnostics and service, 3 Calibration,3 Sensor trim, 1 Zero trim to
prepare to adjust the zero trim.
NOTE
The transmitter must be within 3% of true zero (zero based) in order to
calibrate using the zero trim function.
3. Follow the commands provided by the communicator to complete the
adjustment of the zero trim.
Full Trim
A Full Trim is a two-point sensor calibration where two end-point pressures
are applied, and all output is linearized between them. You should always
adjust the low trim value first to establish the correct offset. Adjustment of the
high trim value provides a slope correction to the characterization curve
based on the low trim value. The factory-established characterization curve is
not changed by this procedure. The trim values allow you to optimize
performance over your specified measuring range at the calibration
temperature.
To calibrate the sensor using the Full Trim function, perform the following
procedure.
1. Assemble and power the entire calibration system including a
transmitter, communicator, power supply, pressure input source, and
readout device.
HART Fast Keys 1, 2, 3, 3, 1
HART Fast Keys 1, 2, 3, 3

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Rosemount 2088 and 2090
NOTE
Use a pressure input source that is at least three times more accurate than
the transmitter, and allow the input pressure to stabilize for 10 seconds before
entering any values.
2. From the communicator main menu select 1 Device setup,
2 Diagnostics and service, 3 Calibration,3 Sensor trim, 2 Lower
sensor trim to prepare to adjust the lower trim point.
NOTE
Select pressure input values so that the low and high values are equal to or
outside the 4 and 20 mA points. Do not attempt to obtain reverse output by
reversing the high and low points. The transmitter allows approximately a 5%
URL deviation from the characterized curve established at the factory.
3. Follow the commands provided by the communicator to complete the
adjustment of the lower value.
4. Repeat the procedure for the upper value, replacing 2 Lower sensor
trim with 3 Upper sensor trim in Step 2.
Output Trim The Output Trim commands allow you to alter the transmitter’s conversion of
the input signal to a 4–20 mA output (see Figure 2-2 on page -7). Adjust the
analog output signal at regular intervals to maintain precision. You can trim
the transmitter output using either the digital to analog trim or the scaled
digital to analog trim function.

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March 2007
Rosemount 2088 and 2090
2-10
Digital to Analog Trim
To perform a Digital-to-Analog Trim, perform the following procedure.
1. From the HOME screen, select 1 Device setup, 2 Diag/Service, 3
Calibration, 4 D/A trim. Select “OK” to after you set the control loop to
manual.
2. Connect an accurate reference meter to the transmitter at the
“Connect reference meter” prompt. To do so, connect the positive
lead to the positive terminal and the negative lead to the test terminal
in the transmitter terminal compartment, or shunt the transmitter
power through the reference meter at some point.
3. Select “OK” after connecting the reference meter.
4. Select “OK” at the “Setting fld dev output to 4 mA” prompt.
The transmitter outputs 4.00 mA.
5. Record the actual value from the reference meter, and enter it at the
“Enter meter value” prompt.
The communicator prompts you to verify whether or not the output
value equals the value on the reference meter.
6. Select 1 Yes if the reference meter value equals the transmitter
output value, or 2 No if it does not.
If you select 1 Yes, proceed to Step 7.
If you select 2 No, repeat Step 5.
7. Select “OK” at the “Setting fld dev output to 20 mA” prompt, and
repeat Steps 5 and 6 until the reference meter value equals the
transmitter output value.
Select “OK” after you return the control loop to automatic control.
Scaled Digital to Analog Trim
The Scaled Digital-to-Analog Trim command matches the 4 and 20 mA points
to a user-selectable reference scale other than 4 and 20 mA (1 to 5 volts if
measuring across a 250 ohm load, or 0 to 100 percent if measuring from a
DCS, for example). To perform a scaled D/A trim, connect an accurate
reference meter to the transmitter and trim the output signal to scale as
outlined in the Output Trim procedure.
NOTE
Use a precision resistor for optimum accuracy. If you add a resistor to the
loop, ensure that the power supply is sufficient to power the transmitter to a
20 mA output with the additional loop resistance.
HART Comm. 1, 2, 3, 2, 1
Rosemount 268 F4, F4, F3, F1, F1
HART Comm. 1, 2, 3, 2, 2
Rosemount 268 F4, F4, F3, F1, F2