Honeywell STT850 SMARTLINE User manual

Honeywell Process Solutions
STT850 SMARTLINE
Temperature Transmitter
User’s Manual
34-TT-25-03
Revision 3
March 2016

Revision 3 STT850 Temperature Transmitter User’s Manual Page ii
Copyrights, Notices and Trademarks
© Copyright 2016 by Honeywell, Inc.
Revision 3, March 2016
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, SFC, Smartline, PlantScape, Experion PKS, and TotalPlant are
registered trademarks of Honeywell International Inc. Other brand or product names are
trademarks of their respective owners.
Honeywell Process Solutions
1250 W Sam Houston Pkwy S
Houston, TX 77042

Revision 3 STT850 Temperature Transmitter User’s Manual Page iii
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 STT850 Temperature
Transmitters. Users who have a Honeywell STT850 SmartLine Temperature Transmitter
configured for HART protocol or Honeywell’s Digitally Enhanced (DE) are referred to the
STT850 SmartLine Series HART/DE Option User’s Manual, document number 34-TT-25-06.
Users who have a Honeywell STT850 SmartLine Temperature Transmitter configured for
Fieldbus operation are referred to the STT850 SmartLine Series Fieldbus Option User’s Manual,
document number (34-TT-25-07).
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 TotalPlant 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:
STT850 SmartLine Temperature Transmitter User Manual, Document # 34-TT-25-03,
Rev 1, March 2014 1st Release
Rev, 2 November 2014 Foundation Fieldbus features added
Rev, 3 March 2016 CVD, Digital Output, W5W26, Housing w/o plug, angle
Brackets, NAMUR 89 Approval and Nic 120 & Cu 10 inputs
added. Advanced diagnostics and Display menus updated.

Page iv STT850 Temperature Transmitter User’s Manual Revision 3
References
The following list identifies publications that may contain information relevant to the information
in this document.
STT850 SmartLine Temperature Transmitter Quick Start Installation Guide, Document
# 34-TT-25-04
STT850 SmartLine Temperature Transmitter with HART Communications Options Safety
Manual, # 34-TT-25-05
STT850 SmartLine Temperature Transmitter HART/DE Option User’s Manual, Document
# 34-TT-25-06
STT850 Transmitter with FOUNDATION Fieldbus Option Installation & Device Reference
Guide, Document # 34-TT-25-07
MC Toolkit User Manual, for 400 or later, Document # 34-ST-25-20
PM/APM SmartLine Transmitter Integration Manual, Document # PM 12-410
STT850 Series Temperature, Transmitter, Agency IS Control Drawing50091227
Smart Field Communicator Model STS 103 Operating Guide, Document # 34-ST-11-14
Patent Notice
The Honeywell STT850 SmartLine Temperature 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 www.honeywellprocess.com
Honeywell Process Solutions https://www.honeywellprocess.com/smartline-temperature/
Training Classes http://www.automationccollege.com
Telephone and Email Contacts
Area
Organization
Phone Number
United States and
Canada
Honeywell Inc.
1-800-343-0228 Customer Service
1-800-423-9883 Global Technical Support
Global Email
Support
Honeywell Process
Solutions
[e-mail]

Revision 3 STT850 Temperature Transmitter User’s Manual Page v
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

Page vi STT850 Temperature Transmitter User’s Manual Revision 3
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").

Revision 3 STT850 Temperature Transmitter User’s Manual Page vii
Contents
1Introduction....................................................................................................................................1
1.1. Overview ................................................................................................................................1
1.2. Features and Options..............................................................................................................1
1.1.1 Physical Characteristics..................................................................................................1
1.1.2 Functional Characteristics ..............................................................................................2
1.3. STT850 SmartLine Transmitter NamePlate...........................................................................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
1.8. Overview ................................................................................................................................5
1.9. Safety......................................................................................................................................5
2.1.1 Accuracy.........................................................................................................................5
2.1.2 Diagnostic Messages ......................................................................................................5
2.1.3 Safety Integrity Level (SIL) ...........................................................................................6
3Installation and Startup...................................................................................................................7
1.10. Installation Site Evaluation.....................................................................................................7
1.11. Honeywell MC Toolkit...........................................................................................................7
1.12. Display Installation Precautions.............................................................................................7
1.13. Mounting STT850 SmartLine Temperature Transmitters......................................................8
3.1.1 Summary.........................................................................................................................8
3.1.2 Mounting Dimensions....................................................................................................9
3.1.3 Bracket Mounting Procedure..........................................................................................9
1.14. Wiring a Transmitter ............................................................................................................10
3.1.4 Loop Power Overview..................................................................................................10
3.1.5 Digital System Integration Information........................................................................12
3.1.6 Wiring Variations.........................................................................................................12
3.1.7 Loop Wiring Procedure................................................................................................12
3.1.8 Grounding and Lightning Protection............................................................................13
3.1.9 Supply Voltage Limiting Requirements.......................................................................13
3.1.10 Process Sealing.............................................................................................................13
3.1.11 Explosion-Proof Conduit Seal......................................................................................13
3.1.12 Input Sensor Wiring .....................................................................................................14
1.15. Startup ..................................................................................................................................18
3.1.13 Overview ......................................................................................................................18
3.1.14 Startup Tasks................................................................................................................18
3.1.15 Output Check Procedures.............................................................................................18
3.1.16 Constant Current Source Mode Procedure...................................................................19
4Operation......................................................................................................................................21
1.16. Overview ..............................................................................................................................21
1.17. Three-Button Operation........................................................................................................21
4.1.1 Menu Navigation..........................................................................................................22
4.1.2 Data Entry.....................................................................................................................22
4.1.3 Editing a Numeric Value..............................................................................................23
4.1.4 Selecting a new setting from a list of choices ..............................................................23
4.1.5 The Advanced Display Menus .....................................................................................24

Page viii STT850 Temperature Transmitter User’s Manual Revision 3
4.1.6 The Basic Display Menu.............................................................................................. 38
4.1.7 Selecting a new setting from a list of choices.............................................................. 42
1.18. Three Button Operation with no Display Installed.............................................................. 43
4.1.8 Zero Adjustment .......................................................................................................... 43
4.1.9 Span Adjustment.......................................................................................................... 43
1.19. Changing the Default Failsafe Direction.............................................................................. 44
4.1.10 DE and Analog Differences......................................................................................... 44
4.1.11 Procedure to Establish Failsafe Operation................................................................... 44
4.1.12 Write Protect Jumper on Foundation Fieldbus (FF)..................................................... 46
1.20. Monitoring the Basic and Advanced Displays..................................................................... 47
4.1.13 Basic Display............................................................................................................... 47
4.1.14 Advanced Displays ...................................................................................................... 47
4.1.15 Button operation during monitoring............................................................................. 50
5Maintenance................................................................................................................................. 51
1.21. Overview.............................................................................................................................. 51
1.22. Preventive Maintenance Practices and Schedules................................................................ 51
1.23. Replacing the Communication Module ............................................................................... 51
6Calibration.................................................................................................................................... 54
1.24. Recommendations for Transmitter Calibration.................................................................... 54
1.25. Calibration Procedures......................................................................................................... 54
7Troubleshooting........................................................................................................................... 56
1.26. Overview.............................................................................................................................. 56
1.27. Critical Diagnostics Screens ................................................................................................ 56
7.1.1 Fault Conditions and Recommended Corrective Actions............................................ 57
8Parts List ...................................................................................................................................... 58
1.28. Overview.............................................................................................................................. 58
Appendix A. PRODUCT CERTIFICATIONS.................................................................................... 63
Glossary............................................................................................................................................... 79

Revision 3 STT850 Temperature Transmitter User’s Manual Page ix
List of Figures
Figure 1 –STT850 Major Assemblies ...................................................................................................2
Figure 2 –Electronics Housing Components.........................................................................................2
Figure 3 –Typical STT850 NamePlate...................................................................................................3
Figure 4 –Typical Bracket Mounted Installations.................................................................................8
Figure 5 –Pipe Mounting Bracket Secured to a Horizontal or Vertical Pipe ........................................9
Figure 6 –HART and DE Transmitter Operating Ranges ...................................................................10
Figure 7 –Transmitter 9-Screw Terminal Board and Grounding Screw .............................................11
Figure 8 –Thermocouple, mV and Volt Connections..........................................................................14
Figure 9 –RTD and Ohm Connections................................................................................................15
Figure 10–HART/FF Dual Input Wiring Diagram............................... Error! Bookmark not defined.
Figure 11 –Digital Output Connections for mA Load (HART only)..................................................17
Figure 12 –Digital Output Connections for PLC Counting Pulse (HART only) ................................17
Figure 13 –Current Loop Test Connections........................................................................................19
Figure 14 –Three-Button Option.........................................................................................................21
Figure 15 –Locating the Failsafe and Write Protect Jumpers..............................................................45
Figure 16 –Basic Display with Process Variable Format....................................................................47
Figure 17 –Advanced Display Formats with the Process Variable.....................................................48
Figure 18 –PWA Replacement............................................................................................................51
Figure 19 –Local Display Fault Diagnostic Conditions......................................................................56
Figure 20 –Pipe and Wall Bracket Parts..............................................................................................59
Figure 21 –Electronic Housing, Display End......................................................................................60
Figure 22 –Electronic Housing, Terminal Block End.........................................................................62

Page x STT850 Temperature Transmitter User’s Manual Revision 3
List of Tables
Table 1 –Features and Options.............................................................................................................. 1
Table 2 –Available Display Characteristics.......................................................................................... 4
Table 3 –STT850 Standard Diagnostics Messages............................................................................... 6
Table 4 –Three-Button Option Functions........................................................................................... 22
Table 5 –Three-Button Data Entry...................................................................................................... 23
Table 6 –Advanced Display Main Menu Structure............................................................................. 24
Table 7 –Diagnostics Menu ................................................................................................................. 25
Table 8 –Display Setup Menus............................................................................................................ 27
Table 9 –Calibration Menus................................................................................................................. 28
Table 10 –Transmitter Setup Menus.................................................................................................... 31
Table 11 –Information Menus ............................................................................................................. 37
Table 12 –The Basic Display Menus.................................................................................................. 38
Table 13 –HART and DE Failsafe and Write Protect Jumpers .......................................................... 45
Table 14 –Fieldbus Simulation and Write Protect Jumpers................................................................ 47
Table 15 –Advanced Displays with PV Format Display Indications.................................................. 48
Table 16 –Fault Conditions and Recommended Corrective Actions.................................................. 57
Table 17 –Summary List of Recommended Spare Parts .................................................................... 58
Table 18 –Pipe, Wall and Angle Bracket Parts................................................................................... 59
Table 19 –Transmitter Major Assemblies........................................................................................... 60

Revision 3 STT850 Temperature Transmitter User’s Manual Page 1
1 Introduction
1.1. Overview
This section is an introduction to the physical and functional characteristics Honeywell’s family of
STT850 SmartLine Temperature Transmitters.
1.2. Features and Options
The STT850 SmartLine Temperature Transmitter is available in a variety of models for measuring
Thermocouples, RTD, Millivolts, and Volt or ohm sensor types. Table 1 lists the protocols, Human-
Machine Interface (HMI), materials, approvals, and mounting bracket options for the STT850.
Table 1 –Features and Options
Feature/Option
Standard/Available Options
Communication Protocols
HART version 7, Digitally Enhanced (DE), Fieldbus
Human-Machine Interface (HMI)
Options (Basic and Advanced Display)
Basic and Advanced Digital Display
Three-button programming (optional)
Basic display language: English only
Advanced display languages: English, German, French,
Spanish, Turkish, Italian, Chinese, Japanese and Russian
Calibration
Single
Approvals (See Appendix C for details.)
ATEX, CSA, FM, IECx, NEPSI
Mounting Brackets
Pipe mounting and wall mounting brackets in carbon steel
and 316 stainless steel.
Integration Tools
Experion
1.1.1 Physical Characteristics
As shown in Figure 1, the STT850 is packaged in one major assembly: the Electronics Housing. The
elements in the Electronic Housing are connected to the process sensors, measure the process
variables, respond to setup commands and execute the software and protocol for the different
temperature measurement types. Figure 2 shows the assemblies in the Electronics Housing with
available options.

Page 2 STT850 Temperature Transmitter User’s Manual Revision 3
Figure 1 –STT850 Major Assemblies
Figure 2 –Electronics Housing Components
1.1.2 Functional Characteristics
The Transmitter measures process Temperature and outputs a signal proportional to the measured
process variable (PV). Available output communication protocols include 4 to 20mA, Honeywell
Digitally Enhanced (DE), HART, and FOUNDATION Fieldbus.

Revision 3 STT850 Temperature Transmitter User’s Manual Page 3
An optional 3-button assembly is available to set up and make adjustments to the Transmitter. In
addition, a Honeywell Multi-Communication (MC) Toolkit (not supplied with the Transmitter) can
facilitate setup and adjustment procedures in the case of HART and DE. Certain adjustments can be
made through an Experion Station or a Universal Station if the Transmitter is digitally integrated with
Honeywell’s Experion or TPS/TDC 3000 control system for HART and DE transmitters.
1.3. STT850 SmartLine Transmitter NamePlate
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 Temperature Transmitter nameplate.
The model number format consists of a Key Number with several table selections.
Figure 3 –Typical STT850 NamePlate
You can readily identify the series and basic Transmitter type from the key number. The letter in the
third digit represents one of these basic transmitter types:
T = Temperature
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” nameplate is located on the bottom of the Electronics Assembly; see Figure 1for
exact location. The approvals nameplate 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
For HART and DE variants, Span adjustments are possible in STT850 SmartLine Temperature
Transmitters with the optional three-button assembly located at the top of the Electronic Housing (see
Figure 2).
For HART and DE you can also use the Honeywell MC Toolkit or other third-party hand-held to
make any adjustments to an STT850 SmartLine Temperature 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. In case of Fieldbus (FF) variants, adjustments
can be made using any Fieldbus compliant DCS or Asset management system including Honeywell
Experion PKS and Honeywell FDM. Any Fieldbus compliant third party handheld configuration may
also be used.
Key I II III IV VVI VII VIII IX
STT850 - _ - _ - _ - _ _ _ - _ _ _ - _ - _ _ _ _ - _ _, _ _, _ _ - XXXX

Page 4 STT850 Temperature Transmitter User’s Manual Revision 3
1.6. Display Options
The STT850 SmartLine Temperature Transmitter has two display options: Basic and Advanced; see Table 2.
Table 2 –Available Display Characteristics
Basic Display
Suitable for basic process needs
360orotation in 90oincrements
8 configurable screens
2 lines,16 characters
Standard units of measurement: °F, °C, °R, K, Ω, mV & % (Custom Units
available for Fieldbus variant)
Diagnostic messaging
Advanced Display
Suitable for custom and complex process needs
360° rotation in 90° increments
Three (3) configurable screen formats with configurable rotation timing
oLarge process variable (PV)
oPV with bar graph
oPV with trend (1-999 hours (allows 31 days), configurable)
Eight (8) screens with 3-30 seconds rotation timing
Standard engineering units (Custom Units available for Fieldbus variant)
Diagnostic alerts and diagnostic messaging
Multiple language support:
oEN, FR, DE, ES, RU, IT, TR
oEN, CH (Kanji), JP
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 and capabilities:
Increment, decrement, and enter key functions.
With the menu-driven display:
oComprehensive on-screen menu for navigation.
oTransmitter configuration (for HART and DE).
oTransmitter calibration (for HART and DE).
oDisplay configuration.
oSet span parameters (for HART and DE).
oViewing transmitter parameters

Revision 3 STT850 Temperature Transmitter User’s Manual Page 5
2 Application Design
1.8. Overview
This section discusses the considerations involved with deploying a Honeywell STT850 SmartLine
Temperature 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
1.9. Safety
2.1.1 Accuracy
The STT850 SmartLine Temperature Transmitter (Transmitter) measures the temperature of a process
and reports the measurement to a receiving device. Refer to STT850 Specification, 34-TT-03-14.
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 for HART
and DE. Problems detected as non-critical diagnostics may affect performance without driving the
analog output to the programmed burnout level (for HART and DE only). 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 STT850 SmartLine Temperature
Transmitter HART/DE Option User Manual, document number 34-TT-25-06.

Page 6 STT850 Temperature Transmitter User’s Manual Revision 3
Table 3 –STT850 Standard Diagnostics Messages
Critical Diagnostics
(Failure Conditions)
Non-Critical Diagnostics (Warning Conditions)
Temperature Sensor Module
Failure
Excess Cal 1 Correct
(Excess LRV Correct and/or Span correct for Sensor Input 1)
Sensor Input 1 Failure
Excess Cal 2 correct
(Excess LRV Correct and/or Span correct for Sensor Input 2)
Sensor Input 2 Failure
Input 1 Out of Range
(Sensor Input 1 Under Range or Over Range)
Communication Module Failure
Input 2 Out of Range
(Sensor Input 2 Under Range or Over Range)
Sensor Comm. Timeout
Sensor Module Over Temperature
Cold Junction Out of Range Error
Sensor Input 1 Open
Sensor Input 1 TB5 Open
Sensor Input 1 TB6 Open
Sensor Input 1 TB7 Open
Sensor Input 1 TB9 Open
Sensor Input 2 Open
Sensor Input 2 TB8 Open
No Factory Calibration
Supply voltage Fault
(External Supply voltage Fail)
Communication Module Over Temperature
No DAC compensation
Unreliable communication between Sensor and Comm
Modules
Display NVM fault
Excess Delta
Internal Power failure for Communication Module
2.1.3 Safety Integrity Level (SIL)
The STT850 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 STT850 Safety Manual, 34-TT-25-05, for additional
information. The Fieldbus variant of STT850 is not SIL certified.

Revision 3 STT850 Temperature Transmitter User’s Manual Page 7
3 Installation and Startup
1.10. Installation Site Evaluation
Evaluate the site selected for the STT850 SmartLine 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 Sensor Input Ratings
1.11. Honeywell MC Toolkit
In preparation for post-installation processes, refer to the MC Toolkit User Manual, Document # 34-
ST-25-20, for battery conditioning and device operation and maintenance information.
1.12. 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.

Page 8 STT850 Temperature Transmitter User’s Manual Revision 3
1.13. Mounting STT850 SmartLine Temperature Transmitters
3.1.1 Summary
Transmitter models can be attached to a two-inch (50 millimeter) vertical or horizontal pipe using
Honeywell’s optional angle. Honeywell’s optional wall mounting bracket is also shown below:
For Housing with Adaptor refer to Honeywell drawings 50095917 (Pipe mount), 50095918 (Wall
mount) and 50124813 (Angle pipe mount) for detailed mounting specifications.
For Housing without adaptor refer to Honeywell drawings 32306827 (No-Adaptor, Pipe mount),
32306828 (No-adaptor, Wall mount) and 50124813 (No-adaptor angle pipe mount).
Figure 4 shows typical bracket-mounted installations.
HORIZONTAL PIPE MOUNTING VERTICAL PIPE MOUNTING WALL PIPE MOUNTING
HORIZONTAL ANGLE PIPE MOUNTING VERTICAL ANGLE PIPE MOUNTING
Figure 4 –Typical Bracket Mounted Installations

Revision 3 STT850 Temperature Transmitter User’s Manual Page 9
3.1.2 Mounting Dimensions
Refer to Honeywell drawing number 50094836 for detailed dimensions of the transmitter assembly.
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.
Refer to Honeywell drawing numbers 50095917 (Pipe Mount) and 50095918 (Wall Mount) for
detailed mounting specifications.
3.1.3 Bracket Mounting Procedure
1. Align the two mounting holes in the transmitter with the two slots in the mounting bracket
and assemble the (2) M8 hex cap screws, (2) lockwashers and (2) flat washers provided.
Rotate transmitter assembly to the desired position and torque the M8 hex cap screws to 27,0
Nm/20,0 Lb-ft maximum.
2. Pipe Mount Option: 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, flat washers and lock washers provided.
3. Wall Mount Option: Position the bracket on the mounting surface at the desired location and
secure the bracket to the mounting surface using the appropriate hardware (Wall mounting
hardware requirements to be determined and supplied by the end user).
HORIZONTAL PIPE VERTICAL PIPE
Figure 5 –Pipe Mounting Bracket Secured to a Horizontal or Vertical Pipe

Page 10 STT850 Temperature Transmitter User’s Manual Revision 3
1.14. Wiring a Transmitter
3.1.4 Loop Power Overview
The transmitter is designed to operate in a two-wire power/current loop with loop resistance and
power supply voltage within the HART or DE operating range shown in Figure 6.
Figure 6 –HART and DE Transmitter Operating Ranges