Honeywell SmartLine ST 800 User manual

Honeywell Process Solutions
SmartLine Pressure Transmitters
ST 800 User’s Manual
34-ST-25-35
Revision 15
October 2023

i ST 800 Pressure Transmitter User’s Manual Revision 15
Copyrights, Notices and Trademarks
© Copyright 2023 by Honeywell International Inc.
Revision 15, October 2023
While the information in this document is presented in good faith and believed to be accurate,
Honeywell disclaims any implied warranties of merchantability and fitness for a particular
purpose and makes no express warranties except as may be stated in the written agreement
with and for its customers. In no event is Honeywell liable to anyone for any indirect, special,
or consequential damages. The information and specifications in this document are subject to
change without notice.
Honeywell, TDC 3000, SmartLine, Plant Scape, Experion PKS, and Total Plant are registered
trademarks of Honeywell International Inc. Other brand or product names are trademarks of
their respective owners.
HoneywellProcess Solutions
2101 City West Blvd
Houston, TX 77042

ii ST 800 Pressure Transmitter User’s Manual Revision 15
About This Manual
This manual is a detailed how to reference for installing, piping, wiring, configuring, starting up,
operating, maintaining, calibrating, and servicing Honeywell’s family of ST 800 SmartLine pressure
transmitters. Users who have a Honeywell ST 800 SmartLine pressure transmitter configured for
HART protocol or Honeywell’s Digitally Enhanced (DE) are referred to the ST 800 Series HART/DE
Option User’s Manual, document number 34-ST-25-38. Users who have a Honeywell ST 800
SmartLine pressure transmitter configured for Fieldbus operation are referred to the ST 800 Series
Fieldbus Option User’s Manual, #34-ST-25-39.
The configuration of your Transmitter depends on the mode of operation and the options selected for
it with respect to operating controls, displays and mechanical installation. This manual provides
detailed procedures to assist first-time users, and it further includes keystroke summaries, where
appropriate, as quick reference or refreshers for experienced personnel.
To digitally integrate a Transmitter with one of the following systems:
•For the Experion PKS, you will need to supplement the information in this document with the
data and procedures in the Experion Knowledge Builder.
•For Honeywell’s Total Plant Solutions (TPS), you will need to supplement the information in
this document with the data in the PM/APM SmartLine Transmitter Integration Manual,
which is supplied with the TDC 3000 book set. (TPS is the evolution of the TDC 3000).
Release Information:
ST 800 SmartLine Pressure Transmitters User’s Manual, Document # 34-ST-25-35,
Rev. 1 October 2012 –First Release
Rev. 2 January 2013 –Document # reference and meter body updates
Rev. 3 February 2013 –Parts list updates
Rev. 4 May 2013 –Updates to Parts list, Explosionproof Seal class, Fail Safe and Comms
Module procedures.
Rev. 5 July 2013 –Control Drawing updated to Rev. D
Rev. 6 Feb 2014 - Advanced display updates. Approvals FISCO & GOST added. PILD, Dual
and Triple Calibration added.
Rev. 7 May 2014 –PILD, Basic Display and High Pass Frequency updates
Rev. 8 July 2014 –PILD update referencing the option upgrade instructions
Rev. 9 December 2014 –MID and Marine approvals added
Rev. 10 July 2016 –DE added to voltage chart, approval updates and EU cert.
Rev. 11 September 2017 –Parts section updated
Rev. 12 November 2018 - EU DECLARATION OF CONFORMITY and approvals updated,
voltage chart updated.
Rev. 13 December 2020 –Enhancements added.
Rev. 14 March 2022 –Enhancements and standard display added, cleanup, and Part number
updated.
Rev. 15 October 2023 –Standard Display Menus Russian Language, MC Toolkit replaced
with Honeywell Versatilis Configurator.

iii ST 800 Pressure Transmitter User’s Manual Revision 15
References
The following list identifies publications that may contain information relevant to the information in
this document.
ST 800 SmartLine Pressure Transmitter Quick Start Installation Guide, # 34-ST-25-36.
ST 800 & ST 700 SmartLine Pressure Transmitter with HART Communications Options Safety
Manual, # 34-ST-25-37.
ST 800 SmartLine Pressure Transmitter HART/DE Option User’s Manual, # 34-ST-25-38.
ST 800 FF Transmitter with FOUNDATION Fieldbus Option Installation & Device Reference Guide,
Document # 34-ST-25-39.
Honeywell Versatilis Configurator User Manual, # 34-ST-25-70.
PM/APM SmartLine Transmitter Integration Manual, Document # PM 12-410.
ST 800 Series Pressure, Analog, HART and DE Communications form, Honeywell drawing
50049892.
Patent Notice
The Honeywell ST 800 SmartLine Pressure Transmitter family is covered by one or more of the
following U.S. Patents: 5,485,753; 5,811,690; 6,041,659; 6,055,633; 7,786,878; 8,073,098; and other
patents pending.
Support and Contact Information
For Europe, Asia Pacific, North and South America contact details, refer to the back page of this manual
or the appropriate Honeywell Solution Support web site:
Honeywell Corporate https://process.honeywell.com
Honeywell Process Solutions https://process.honeywell.com/Remote-meter-assemblies
Telephone and Email Contacts
Area
Organization
Phone Number
United States and
Canada
Honeywell International Inc.
1-800-343-0228 Customer Service
1-800-423-9883 Global Technical Support
Global Email
Support
Honeywell Process Solutions
[e-mail]

iv ST 800 Pressure Transmitter User’s Manual Revision 15
Symbol Descriptions and Definitions
The symbols identified and defined in the following table may appear in this document.
Symbol
Definition
ATTENTION: Identifies information that requires special consideration.
TIP: Identifies advice or hints for the user, often in terms of performing a task.
CAUTION
Indicates a situation which, if not avoided, may result in equipment or work (data) on
the system being damaged or lost, or may result in the inability to properly operate
the process.
CAUTION: Indicates a potentially hazardous situation which, if not avoided, may
result in minor or moderate injury. It may also be used to alert against unsafe
practices.
CAUTION symbol on the equipment refers the user to the product manual for
additional information. The symbol appears next to required information in the
manual.
WARNING: Indicates a potentially hazardous situation, which, if not avoided, could
result in serious injury or death.
WARNING symbol on the equipment refers the user to the product manual for
additional information. The symbol appears next to required information in the
manual.
WARNING, Risk of electrical shock: Potential shock hazard where HAZARDOUS
LIVE voltages greater than 30 Vrms, 42.4 Vpeak, or 60 VDC may be accessible.
ESD HAZARD: Danger of an electro-static discharge to which equipment may be
sensitive. Observe precautions for handling electrostatic sensitive devices.
Protective Earth (PE) terminal: Provided for connection of the protective earth (green
or green/yellow) supply system conductor.
Functional earth terminal: Used for non-safety purposes such as noise immunity
improvement. NOTE: This connection shall be bonded to Protective Earth at the
source of supply in accordance with national local electrical code requirements.
Earth Ground: Functional earth connection. NOTE: This connection shall be bonded
to Protective Earth at the source of supply in accordance with national and local
electrical code requirements.
Chassis Ground: Identifies a connection to the chassis or frame of the equipment shall
be bonded to Protective Earth at the source of supply in accordance with national and
local electrical code requirements.
continued

v ST 800 Pressure Transmitter User’s Manual Revision 15
Symbol
Description
The Factory Mutual® Approval mark means the equipment has been rigorously
tested and certified to be reliable.
The Canadian Standards mark means the equipment has been tested and meets
applicable standards for safety and/or performance.
The Ex mark means the equipment complies with the requirements of the European
standards that are harmonized with the 94/9/EC Directive (ATEX Directive, named
after the French "Atmosphere Explosible").

vi ST 800 Pressure Transmitter User’s Manual Revision 15
Table of Contents
1Introduction...........................................................................................................................................................1
1.1 Overview.......................................................................................................................................................1
1.2 Features and Options.....................................................................................................................................1
1.2.1 Physical Characteristics ................................................................................................................................1
1.2.2 Functional Characteristics.............................................................................................................................2
1.3 ST 800 Transmitter Name Plate ....................................................................................................................3
1.4 Safety Certification Information....................................................................................................................3
1.5 Transmitter Adjustments ...............................................................................................................................3
1.6 Display Options.............................................................................................................................................4
1.7 Optional 3-Button Assembly.........................................................................................................................4
2Application Design ...............................................................................................................................................5
2.1 Overview.......................................................................................................................................................5
2.1.1 Accuracy.......................................................................................................................................................5
2.1.2 Diagnostic Messages.....................................................................................................................................5
2.1.3 Safety Integrity Level (SIL)..........................................................................................................................6
2.1.4 Plugged Impulse Line detection (PILD)........................................................................................................6
3Installation and Startup..........................................................................................................................................7
3.1 Installation Site Evaluation............................................................................................................................7
3.2 Honeywell Versatilis Configurator................................................................................................................7
3.3 Display Installation Precautions....................................................................................................................8
3.4 Mounting ST 800 SmartLine pressure transmitters.......................................................................................8
3.4.1 Summary.......................................................................................................................................................8
3.4.2 Mounting Dimensions...................................................................................................................................9
3.4.3 Bracket Mounting Procedure.........................................................................................................................9
3.4.4 Mounting transmitters with Small Absolute or Differential Pressure Spans................................................11
3.4.5 Flange Mounting.........................................................................................................................................11
3.4.6 Flush Mounting Procedure..........................................................................................................................12
3.4.7 Remote Diaphragm Seal Mounting Information.........................................................................................13
3.5 Piping the ST 800 Transmitter.....................................................................................................................14
3.5.1 Piping Arrangements ..................................................................................................................................14
3.5.2 Suggestions for Transmitter Location .........................................................................................................15
3.5.3 General Piping Guidelines...........................................................................................................................15
3.5.4 Procedure to Install Flange Adapters...........................................................................................................15
3.6 Wiring a Transmitter...................................................................................................................................16
3.6.1 Overview.....................................................................................................................................................16
3.6.2 Digital System Integration Information.......................................................................................................18
3.6.3 Wiring Variations........................................................................................................................................18
3.6.4 Wiring Procedure........................................................................................................................................18
3.6.5 Lightning Protection....................................................................................................................................18
3.6.6 Supply Voltage Limiting Requirements......................................................................................................18
3.6.7 Process Sealing............................................................................................................................................19
3.6.8 Explosion-Proof Conduit Seal.....................................................................................................................19
3.7 Startup.........................................................................................................................................................19
3.7.1 Overview.....................................................................................................................................................19
3.7.2 Startup Tasks...............................................................................................................................................19
3.7.3 Output Check Procedures............................................................................................................................20
3.7.4 Constant Current Source Mode Procedure..................................................................................................20

vii ST 800 Pressure Transmitter User’s Manual Revision 15
4Operation.............................................................................................................................................................22
4.1 Overview.....................................................................................................................................................22
4.2 Three-Button Operation...............................................................................................................................22
4.2.1 Menu Navigation ........................................................................................................................................23
4.2.2 Data Entry ...................................................................................................................................................24
4.2.3 Editing a Numeric Value.............................................................................................................................24
4.2.4 Selecting a new setting from a list of choices .............................................................................................24
4.2.5 The Advanced Display Menus ....................................................................................................................25
4.2.6 The Standard Display Menu........................................................................................................................40
4.2.7 The Basic Display Menu.............................................................................................................................76
4.2.8 Selecting a new setting from a list of choices .............................................................................................80
4.3 Three Button Operation with no display Installed.......................................................................................80
4.3.1 Zero Adjustment .........................................................................................................................................80
4.3.2 Span Adjustment.........................................................................................................................................80
4.4 Changing the Default Failsafe Direction .....................................................................................................81
4.4.1 DE and Analog Differences.........................................................................................................................81
4.4.2 Procedure to Establish Failsafe Operation...................................................................................................81
4.5 Monitoring the Basic, Standard and Advanced Displays.............................................................................84
4.5.1 Basic Display ..............................................................................................................................................84
4.5.2 Standard Display.........................................................................................................................................84
4.5.3 Advanced Display.......................................................................................................................................85
4.5.4 Button operation during monitoring............................................................................................................87
5Maintenance........................................................................................................................................................88
5.1 Overview.....................................................................................................................................................88
5.2 Preventive Maintenance Practices and Schedules........................................................................................88
5.3 Inspecting and Cleaning Barrier Diaphragms..............................................................................................88
5.4 Replacing the Communication Module.......................................................................................................91
5.5 Replacing the Meter Body...........................................................................................................................93
5.6 PILD Option Licensing ...............................................................................................................................96
6Calibration...........................................................................................................................................................97
6.1 Recommendations for Transmitter Calibration...........................................................................................97
6.2 Calibration Procedures ................................................................................................................................97
6.2.1 Dual/Triple Cal............................................................................................................................................97
7Troubleshooting..................................................................................................................................................98
7.1 Overview.....................................................................................................................................................98
7.2 Critical Diagnostics Screens........................................................................................................................98
7.2.1 Fault Conditions and Recommended Corrective Actions............................................................................98
8Parts List ...........................................................................................................................................................100
8.1 Overview...................................................................................................................................................100
9PRODUCT CERTIFICATIONS ......................................................................................................................114
9.1 Safety Instrumented Systems (SIS) Installations.......................................................................................114
9.2 European Directive Information (CE Mark)..............................................................................................114
9.3 Hazardous Locations Certifications...........................................................................................................120
9.4 Control Drawing........................................................................................................................................124
9.5 Marine Approvals .....................................................................................................................................129
9.6 MeasurementInstruments Directive (MID)...............................................................................................129
9.7 Recycling and disposal of product.............................................................................................................130
Glossary....................................................................................................................................................................131

viii ST 800 Pressure Transmitter User’s Manual Revision 15
List of Figures
Figure 1 –ST 800 Major Assemblies .....................................................................................................................................2
Figure 2 –Electronics Housing Components..........................................................................................................................2
Figure 3 –Typical ST 800 Name Plate....................................................................................................................................3
Figure 4 –Typical Bracket Mounted and Flange Mounted Installations ................................................................................8
Figure 5 –Angle Mounting Bracket Secured to a Horizontal or Vertical Pipe.......................................................................9
Figure 6 –Inline Model Mounted to an Optional Bracket....................................................................................................10
Figure 7 –Rotating the Electronics Housing........................................................................................................................10
Figure 8 –Using a Spirit Balance to Level a transmitter ......................................................................................................11
Figure 9 –Tank-Flange Mounted transmitter.......................................................................................................................12
Figure 10 –Typical Flush and Flange Mounted Installations...............................................................................................12
Figure 11 –Representative Remote Diaphragm Seal Transmitter Installation......................................................................13
Figure 12 –Typical 3-Valve Manifold with Blow-Down Piping .........................................................................................14
Figure 13 –Flange Adapter Removal and Replacement.......................................................................................................16
Figure 14 –Transmitter Operating Ranges...........................................................................................................................16
Figure 15 –Transmitter 3-Screw Terminal Board and Grounding Screw ............................................................................17
Figure 16 –Current Loop Test Connections.........................................................................................................................20
Figure 17 –Three-Button Option .........................................................................................................................................22
Figure 18 –Locating the Failsafe and Write Protect Jumpers ..............................................................................................82
Figure 19 –Basic Display with Process Variable Format.....................................................................................................84
Figure 20 –Standard Display with Process Variable Format...............................................................................................84
Figure 21 –Advanced Display Formats with the Process Variable......................................................................................85
Figure 22 –DP Transmitter Head Disassembly....................................................................................................................89
Figure 23 –Head Bolt Tightening Sequence........................................................................................................................90
Figure 24 –PWA Replacement ............................................................................................................................................91
Figure 25 –Disassembly for Meter Body Replacement .......................................................................................................93
Figure 26 –Hardware Location to Remove the Meter Assembly.........................................................................................94
Figure 27 –Meter Body Reassembly....................................................................................................................................95
Figure 28 –Head Bolt Tightening Sequence........................................................................................................................95
Figure 29 –Local Display Fault Diagnostic Conditions.......................................................................................................98
Figure 30 –Angle and Flat Bracket Parts...........................................................................................................................101
Figure 31 –Electronic Housing, Display End.....................................................................................................................102
Figure 32 –Electronic Housing, Terminal Block End........................................................................................................103
Figure 33 –Transmitter Major Assemblies.........................................................................................................................104
Figure 34 - ST 800 Models STD810, 820, 825, 830, & 870...............................................................................................107
Figure 35 –STG830, 840, 870, and STA822, 840 Transmitter Body.................................................................................110
Figure 36 –Inline Gauge and Inline Atmospheric Display Bodies ....................................................................................111
Figure 37 –Flush Mount Meter Body.................................................................................................................................111
Figure 38 a –Extended Flange Design...............................................................................................................................112
Figure 39 –Pseudo Flange design......................................................................................................................................113
Figure 40 –Remote Seal Diaphragm..................................................................................................................................113

ix ST 800 Pressure Transmitter User’s Manual Revision 15
List of Tables
Table 1 –Features and Options...............................................................................................................................................1
Table 2 –Available Display Characteristics...........................................................................................................................4
Table 3 - ST 800 Standard Diagnostics Messages..................................................................................................................5
Table 4 –Flange Mounting Guidelines.................................................................................................................................13
Table 5 –Remote Diaphragm Mounting Details..................................................................................................................14
Table 6 –Suggested Connection Locations..........................................................................................................................15
Table 7 –Three-Button Option Functions............................................................................................................................23
Table 8 –Three-Button Data Entry.......................................................................................................................................24
Table 9 –Advanced Display Main Menu Structure..............................................................................................................25
Table 10 –Diagnostics Menu...............................................................................................................................................26
Table 11 –Display Setup Menus..........................................................................................................................................28
Table 12 –Calibration Menus ..............................................................................................................................................33
Table 13 –Transmitter Setup Menus....................................................................................................................................36
Table 14 –Information Menus..............................................................................................................................................40
Table 15 –The Standard Display Menus..............................................................................................................................41
Table 16 - ST 800 Standard Transmitter: Standard Display Menus Russian Language........................................................58
Table 17 –The Basic Display Menus...................................................................................................................................76
Table 18 –Hart and DE Failsafe and Write Protect Jumpers................................................................................................82
Table 19 –Fieldbus Simulation and Write Protect Jumpers.................................................................................................83
Table 20 –Advanced Display with PV Format Display Indications.....................................................................................86
Table 21 –Head Bolt Torque Values....................................................................................................................................90
Table 22 –Fault Conditions and Recommended Corrective Actions. ..................................................................................98
Table 23 –Summary List of Recommended Spare Parts....................................................................................................100
Table 24 –Angle and Flat Bracket Parts ............................................................................................................................102
Table 25 –Transmitter Major Assemblies..........................................................................................................................103
Table 26 –ST 800 Models STD810, 820, 825, 830 & 870.................................................................................................105
Table 27 –Parts for STG830, 840, 870 and STA822, 840 Transmitter Body....................................................................108
Table 28 –Inline Gauge and Inline Atmospheric Meter Body Parts...................................................................................111
Table 29 –Flush Mount Meter Body Parts........................................................................................................................111
Table 30 –Flange-Mounted Meter Body Parts...................................................................................................................112

1 ST 800 Pressure Transmitter User’s Manual Revision 15
1Introduction
1.1 Overview
This section is an introduction to the physical and functional characteristics Honeywell’s family of ST
800 SmartLine pressure transmitters.
1.2 Features and Options
The ST 800 SmartLine pressure transmitter is available in a variety of models for measuring Differential
Pressure (DP), Gauge Pressure (GP), and Absolute Pressure (AP). Table 1 lists the protocols, human
interface (HMI), materials, approvals, and mounting bracket options for the ST 800.
Table 1 –Features and Options
Feature/Option
Standard/Available Options
Communication Protocols
HART version 7, Digitally Enhanced (DE), Fieldbus
Display Options
(Basic, Standard and Advanced)
Basic Display
• Three-button programming (optional)
• Languages: English only
Standard Display (HARTonly)
• Two integral buttons programming (optional)
Languages: English and Russian
Advanced Display
• Three-button programming (optional)
• Languages: English, German, French, Italian,
Spanish, Turkish, Russian, Chinese, and
Japanese
Calibration
Single, Dual and Triple Calibrations.
Approvals
See Appendix C for details.
FM, CSA, ATEX, IECEx, SAEx, INMETRO, NEPSI, EAC,
KOSHA, MARINE and MID
Mounting Brackets
Angle/flat carbon steel/304 stainless steel, Marine 304 stainless
steel, 316 Stainless Steel
Integration Tools
Experion
The three-button option is available for the advanced and basic displays. The two-
button option is available for the standard display.
Also, for the advanced and basic displays, the two-button option is usedonly forspan and zero
correction and not for display navigation.
1.2.1 Physical Characteristics
As shown in Figure 1, the ST 800 is packaged in two major assemblies: the electronics housing and the
meter body. The elements in the electronic housing respond to setup commands and execute the software
and protocol for the different pressure measurement types. Figure 2 shows the assemblies in the
electronics housing with available options.

2 ST 800 Pressure Transmitter User’s Manual Revision 15
The meter body provides connection to a process system. Several physical interface configurations are
available, as determined by the mounting and mechanical connections, all of which are described in the
“Installation” section of this manual.
Figure 1 –ST 800 Major Assemblies
Figure 2 –Electronics Housing Components
1.2.2 Functional Characteristics
Functionally, the transmitter can measure process pressure and provides a proportional analog 4 to 20 mA
output to the measured process variable (PV). Available output communication protocols include
Honeywell Digitally Enhanced (DE), HART, and FOUNDATION Fieldbus.
An optional 3-button assembly is availableto set up and make adjustments to the transmitter. In addition,
the Honeywell Versatilis Configurator (not supplied with the transmitter) can facilitate setup and
adjustment procedures. Certain adjustments can be made through an Experion Station or a Universal

3 ST 800 Pressure Transmitter User’s Manual Revision 15
Station if the transmitter is digitally integrated with Honeywell’s Experion or TPS/TDC 3000 control
system.
1.3 ST 800 Transmitter Name Plate
The transmitter nameplate mounted on the bottom of the electronics housing (see Figure 1) lists its model
number, physical configuration, electronics options, accessories, certifications, and manufacturing
specialties. Figure 3 is an example of a typical Gauge Pressure (GP) or Atmospheric Pressure (AP)
transmitter name plate. The model number format consists of a Key Number with several table selections.
The Differential Pressure (DP), Absolute Pressure (AP), and Gauge Pressure (GP) name plates are
essentially the same. However, the DP provides one additional entry (7 vs. 6) in the meter body Selections
(Table I) to accommodate the static pressure rating.
Figure 3 –Typical ST 800 Name Plate
You can readily identify the series and basic transmitter type from the third and fourth digits in the key
number. The letter in the third digit represents one of these basic transmitter types:
•A = Absolute Pressure
•D = Differential Pressure
•F = Flange Mounted
•G = Gauge Pressure
•R = Remote Seals
For a complete selection breakdown, refer to the appropriate Specification and Model Selection Guide
provided as a separate document.
1.4 Safety Certification Information
An “approvals” name plate is located on the bottom of the electronics housing assembly; see Figure 1 for
exact location. The approvals name plate contains information and service marks that disclose the
transmitter compliance information. Refer to Appendix C of this document for safety certification
requirements and details.
1.5 Transmitter Adjustments
Zero and Span adjustments are possible in ST 800 SmartLine pressure transmitters with the optional
three-button assembly located at the top of the Electronic Housing (see Figure 2).
You can also use the Honeywell Versatilis Configurator or other third-party handheld to make any
adjustments to an ST 800 SmartLine pressure transmitter. Alternately, certain adjustments can be made
through the Experion or Universal Station if the transmitter is digitally integrated with a Honeywell
Experion or TPS system.

4 ST 800 Pressure Transmitter User’s Manual Revision 15
1.6 Display Options Table 2 –Available Display Characteristics
Basic Display
• 360° rotation in 90° Increments.
• 2 lines,16 characters each
• Standard and custom engineering units.
• Diagnostic messaging.
• English only
• Square root output indication.
Standard
Display
• 360° rotation in 90° Increments.
• 2 lines, 8 characters each
• Diagnostic messaging.
• Standard and custom engineering units.
• Four (4) screens with 2-20 seconds rotation timing.
• English and Russian language support.
• Square root output indication.
Advanced
Display
• 360° rotation in 90° increments.
• Three (3) configurable screen formats:
o Large process variable (PV).
o PV with bar graph.
o PV with trend (1-24 hours, configurable).
• Eight (8) screens with 3-30 seconds rotation timing.
• Standard and custom engineering units.
• Diagnostic alerts and diagnostic messaging.
• Multiple language support:
o EN, FR, GE, SP, RU, IT & TK.
o EN, CH (Kanji), JP.
• Square root output indication.
• Supports 3-button configuration and calibration.
• Supports transmitter messaging and maintenance mode indications.
1.7 Optional 3-Button Assembly
The optional 3-button assembly provides the following features:
•Opportunity for immediate reaction with minimal disruptions.
•Improved maintenance time.
•Potential savings on handheld units.
•Suitable for all environments: hermetically sealed for long life in harsh environments.
•Suitable for use in all electrical classifications (flameproof, dustproof, and intrinsically safe).
The 3-button assembly is externally accessible and provides the following capabilities:
•Menu-driven configuration with optional display:
oUsing increment, decrement & enter keys.
oA comprehensive on-screen menu guides the way.
oConfigure the transmitter.
oConfigure the display.
oSet zero and span.
•Zero and span settings without optional display.

5 ST 800 Pressure Transmitter User’s Manual Revision 15
2Application Design
2.1 Overview
This section discusses the considerations involved with deploying a Honeywell ST 800 SmartLine pressure
transmitter in a process system. The following areas are covered:
•Safety
•Input and output data
•Reliability
•Environmental limits
•Installation considerations
•Operation and maintenance
•Repair and replacement
2.1.1 Accuracy
The ST 800 SmartLine pressure transmitter measures the gauge, differential, or absolute pressure of a
process and reports the measurement to a receiving device.
2.1.2 Diagnostic Messages
Transmitter standard diagnostics are reported in the two basic categories listed in Table 3. Problems
detected as critical diagnostics drive the analog output to the programmed burnout level. Problems
detected as non-critical diagnostics may affect performance without driving the analog output to the
programmed burnout level. Informational messages (not listed in Table 3) report various transmitter status
or setting conditions. The messages listed in Table 3 are specific to the transmitter, exclusive of those
associated with HART and DE protocols. HART and DE diagnostic messages are listed and described in
the ST 800 SmartLine Pressure Transmitter HART/DE Option User Manual, #34-ST- 25-38.
Table 3 - ST 800 Standard Diagnostics Messages
CriticalDiagnostics(Failure Conditions)
Non-Critical Diagnostics (Warning Conditions)
Electronic Module DAC Failure
No DAC Compensation
Loop Current Noise
Meter Body NVM Corrupt
No Factory Calibration
AO Out of Range
Config Data Corrupt
PV Out of Range
URV Set Err. Span Config Button
Electronic Module Diag Failure
Fixed Current Mode
LRV Set Err. Zero Config Button
Meter Body Critical Failure
Sensor Over Temperature
PILD Blockage Detected
Sensor Comm Timeout
Meter Body Excess Correct
Local Display
Low Supply Voltage
No DAC Calibration
Tamper Alarm
Meter Body Unreliable Comm

6 ST 800 Pressure Transmitter User’s Manual Revision 15
2.1.3 Safety Integrity Level (SIL)
The ST800 is intended to achieve sufficient integrity against systematic errors by the manufacturer’s
design. A Safety Instrumented Function (SIF) designed with this product must not be used at a SIL level
higher than the statement, without “prior use” justification by the end user or diverse technology
redundancy in the design. Refer to the ST 800 & ST 700 Safety Manual, #34-ST-25-37, for additional
information.
2.1.4 Plugged Impulse Line detection (PILD)
STA, STD, STG, and STF800 models are offered with a PILD option which provide indication of a
plugged impulse line or process connection. When used in conjunction with a basic or advanced display, a
non-critical diagnostic indication appears on the integral display. For units without an integral display, an
indication can be seen via the host or handheld device when HART Protocol is utilized.
This diagnostic detects clogged or plugged impulse lines. Plugged impulse line detection (PILD) is based
on statistical models which continuously compare baseline, or normal, operating noise patterns to check
for statistically significant changes when one or both (DP) impulse lines become clogged.
See Section 5.6 for details on PILD option licensing.

7 ST 800 Pressure Transmitter User’s Manual Revision 15
3Installation and Startup
3.1 Installation Site Evaluation
Evaluate the site selected for the ST 800 transmitter installation with respect to the process system design
specifications and Honeywell’s published performance characteristics for your particular model. Some
parameters that you may want to include in your site evaluation are:
•Environmental Conditions:
oAmbient Temperature
oRelative Humidity
•Potential Noise Sources:
oRadio Frequency Interference (RFI)
oElectromagnetic Interference (EMI)
•Vibration Sources
oPumps
oMotorized System Devices (e.g., pumps)
oValve Cavitation
•Process Parameters
oTemperature
oMaximum Pressure Rating
3.2 Honeywell Versatilis Configurator
The Honeywell Versatilis Configurator, hereinafter referred as HVC in this document, consists of the
Advanced Communication Interface and Honeywell Versatilis Configurator app. It is a next-generation
universal handheld solution for configuring, calibrating, monitoring and diagnosing field devices. It
converts conventional field devices to smart field devices and lets them communicate with the
Honeywell Versatilis Configurator through Bluetooth.
For more information, refer to the ‘Setup’section in the Honeywell Versatilis Configurator User Manual,
34-ST-25-70 (click the link and navigate to the ‘Support’ tab to access the manual) for device operation
and maintenance.

8 ST 800 Pressure Transmitter User’s Manual Revision 15
3.3 Display Installation Precautions
Temperature extremes can affect display quality. The display can become unreadable at temperature
extremes; however, this is only a temporary condition. The display will again be readable when
temperatures return to within operable limits.
The display update rate may increase at cold temperature extremes, but as with readability, normal
updating resumes when temperatures are within limits for full operability.
3.4 Mounting ST 800 SmartLine pressure transmitters
3.4.1 Summary
Transmitter models, except flush mounts and those with integral flanges, can be attached to a two-inch
(50 millimeter) vertical or horizontal pipe using Honeywell’s optional angle or flat mounting bracket;
alternately you can use your own bracket. Flush-mount models are attached directly to a process pipe or
tank by a one-inch weld nipple. Models with integral flanges are supported by the flange connection.
Figure 4 shows typical bracket-mounted and flange-mounted transmitter installations.
Figure 4 –Typical Bracket Mounted and Flange Mounted Installations

9 ST 800 Pressure Transmitter User’s Manual Revision 15
3.4.2 Mounting Dimensions
Refer to Honeywell drawing number 50049930 (Dual Head), 50049931 (In-Line), 50049932 (Flange
Mount) 50049933 (Extended Flange), and 50049934 (Remote Seal) for detailed dimensions. Abbreviated
overall dimensions are also shown on the Specification Sheets for the transmitter models. This section
assumes that the mounting dimensions have already been taken into account and the mounting area can
accommodate the transmitter.
3.4.3 Bracket Mounting Procedure
If you are using an optional bracket, start with Step 1. For an existing bracket, start with Step 2.
1. Refer to Figure 5. Position the bracket on a 2-inch (50.8 mm) horizontal or vertical pipe and
install a “U” bolt around the pipe and through the holes in the bracket. Secure the bracket with the
nuts and lock washers provided.
Figure 5 –Angle Mounting Bracket Secured to a Horizontal or Vertical Pipe
2. Align the appropriate mounting holes in the transmitter with the holes in the bracket. Use the
bolts and washers provided to secure the transmitter to the bracket; see the following variations.
Transmitter Type
Use Hardware
DPwith double-ended process heads
and/or remote seals
Alternate mounting holes in the ends of the
heads.
In-line GP and AP (STG xxL and STA
xxL)
The smaller “U” bolt provided to attach the
meter body to the bracket. See the following
example.
Dual-head GP and AP
Mounting holes in the end of the process head.
Example: Inline model mounted to an optional angle bracket, See Figure 6.
Lockwashers
Lockwashers
Mounting
U-Bolt
Mounting
Horizontal Pipe
U-Bolt

10 ST 800 Pressure Transmitter User’s Manual Revision 15
Figure 6 –Inline Model Mounted to an Optional Bracket
3. Loosen the set screw on the outside neck of the transmitter one (1) full turn.
4. Rotate the electronics housing a maximum of 180oleft or right from the center to the position you
require and tighten the set screw 8.9 to 9.7 pound-inches (1.40 to 1.68 Newton meters), using a
4mm metric socket head wrench. See the following example and Figure 7.
Example: Rotating the electronics housing
Figure 7 –Rotating the Electronics Housing
The mounting position of absolute pressure models STA822, STA82L, or a draft range
model STD810 is critical as the transmitter spans become smaller.
A maximum zero shift of 2.5 mmHg for an absolute transmitter or 1.5 inches of water
(inH2O) for a draft range transmitter can result from a mounting position that is rotated 90°
from the vertical. A typical zero-shift of 0.12 mmHg or 0.20 inH2O can occur for a five (5)-
degree rotation from the vertical.