Honeywell STT750 SmartLine User manual

Honeywell Process Solutions
STT750 SmartLine
Temperature Transmitter
User’s Manual
34-TT-25-13
Revision 4
September 2017

Page ii STT750 Temperature Transmitter User’s Manual Revision 4
Copyrights, Notices and Trademarks
© Copyright 2017 by Honeywell, Inc.
Revision 4, September 2017
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 4 STT750 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 STT750 Temperature
Transmitters. Users who have a Honeywell STT750 SmartLine Temperature Transmitter
configured for HART protocol are referred to the STT750 SmartLine Series HART Option User’s
Manual, document number 34-TT-25-15.
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:
STT750 SmartLine Temperature Transmitter User Manual, Document # 34-TT-25-13,
Rev 1, August 2015 1st Release
Rev.2 March 2016 CVD, W5W26, Soft DO, Housing w/o plug, angle Brackets,
NAMUR 89 Approval, Ni 120 & Cu 10 inputs added
and Display menus updated.
Rev.3 November 2016 Roxspur Cu100 and GOST sensor types added
Rev.4 September 2017 Control drawing updated to Rev.D, EAC, KOSHA and
Marine approvals/certs and mtg dwgs updated.

Page iv STT750 Temperature Transmitter User’s Manual Revision 4
References
The following list identifies publications that may contain information relevant to the information
in this document.
STT750 SmartLine Temperature Transmitter Quick Start Installation Guide, Document
# 34-TT-25-14
SmartLine Temperature Transmitter with HART Communications Options Safety Manual,
# 34-TT-25-05
STT750 SmartLine Temperature Transmitter HART Option User’s Manual, Document
# 34-TT-25-15
MC Toolkit User Manual, for MCT404, Document # 34-ST-25-50
PM/APM SmartLine Transmitter Integration Manual, Document # PM 12-410
STT750 Series Temperature, Transmitter, Agency IS Control Drawing 50091227
Smart Field Communicator Model STS 103 Operating Guide, Document # 34-ST-11-14
Patent Notice
The Honeywell STT750 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 4 STT750 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 STT750 Temperature Transmitter User’s Manual Revision 4
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 4 STT750 Temperature Transmitter User’s Manual Page vii
Contents
1. Introduction....................................................................................................................................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. STT750 SmartLine Transmitter Nameplate...........................................................................3
1.4. Safety Certification Information.............................................................................................3
1.5. Transmitter Adjustments........................................................................................................3
1.6. Display....................................................................................................................................4
1.7. Optional 3-Button Assembly..................................................................................................4
2. Application Design.........................................................................................................................5
2.1. Overview ................................................................................................................................5
2.2. Safety......................................................................................................................................5
2.2.1. Accuracy.........................................................................................................................5
2.2.2. Diagnostic Messages......................................................................................................5
3. Installation and Startup...................................................................................................................7
3.1. Installation Site Evaluation.....................................................................................................7
3.2. Honeywell MC Toolkit...........................................................................................................7
3.3. Display Installation Precautions.............................................................................................7
3.4. Mounting STT750 SmartLine Temperature Transmitters......................................................8
3.4.1. Summary.........................................................................................................................8
3.4.2. Mounting Dimensions..................................................................................................10
3.4.3. Bracket Mounting Procedure........................................................................................12
3.5. Wiring a Transmitter ............................................................................................................13
3.5.1. Loop Power Overview..................................................................................................13
3.5.2. Wiring Variations.........................................................................................................15
3.5.3. Loop Wiring Procedure................................................................................................15
3.5.4. Grounding and Lightning Protection............................................................................16
3.5.5. Explosion-Proof Conduit Seal......................................................................................16
3.5.6. Input Sensor Wiring .....................................................................................................17
3.6. Startup ..................................................................................................................................18
3.6.1. Overview ......................................................................................................................18
3.6.2. Startup Tasks................................................................................................................18
3.6.3. Output Check Procedures.............................................................................................18
3.6.4. Constant Current Source Mode Procedure...................................................................19
4. Operation......................................................................................................................................20
4.1. Overview ..............................................................................................................................20
4.2. Three-Button Operation........................................................................................................20
4.2.1. Menu Navigation..........................................................................................................21
4.2.2. Data Entry.....................................................................................................................21
4.2.3. Editing a Numeric Value..............................................................................................22
4.2.4. Selecting a new setting from a list of choices ..............................................................22
4.2.5. The Display Menu........................................................................................................23
4.3. Three Button Operation with no Display Installed...............................................................27
4.3.1. Zero Adjustment...........................................................................................................27
4.3.2. Span Adjustment ..........................................................................................................27

Page viii STT750 Temperature Transmitter User’s Manual Revision 4
4.4. Changing the Default Failsafe Direction.............................................................................. 28
4.4.1. Procedure to Establish Failsafe Operation................................................................... 28
4.5. Monitoring the Display........................................................................................................ 30
4.5.1. Display......................................................................................................................... 30
5. Maintenance................................................................................................................................. 31
5.1. Overview.............................................................................................................................. 31
5.2. Preventive Maintenance Practices and Schedules................................................................ 31
5.3. Replacing the Communication Module ............................................................................... 31
6. Calibration.................................................................................................................................... 34
6.1. Recommendations for Transmitter Calibration.................................................................... 34
6.2. Calibration Procedures......................................................................................................... 34
7. Troubleshooting........................................................................................................................... 35
7.1. Overview.............................................................................................................................. 35
7.2. Critical Diagnostics Screens ................................................................................................ 35
7.2.1. Fault Conditions and Recommended Corrective Actions............................................ 35
8. Parts List ...................................................................................................................................... 36
8.1. Overview.............................................................................................................................. 36
Appendix A. PRODUCT CERTIFICATIONS.................................................................................... 40
9. Appendix B –Security................................................................................................................. 57
8.2. How to report security vulnerability.................................................................................... 57
Glossary............................................................................................................................................... 58

Revision 4 STT750 Temperature Transmitter User’s Manual Page ix
List of Figures
Figure 1 –STT750 Major Assemblies ...................................................................................................2
Figure 2 –Electronics Housing Components.........................................................................................2
Figure 3 –Typical STT750 Nameplate...................................................................................................3
Figure 4 –STT750 with adapter housing - Horizontal Wall Mounting.................................................8
Figure 5 –STT750 No-Adapter Horizontal Wall Mounting..................................................................8
Figure 6 –STT750 Pipe Mount with adapter housing - Horizontal & Vertical.....................................9
Figure 7 –STT750 Pipe Mount, Vertical...............................................................................................9
Figure 8 –STT750 with adapter housing - Dimensions.......................................................................10
Figure 9 –STT750 no adapter housing dimensions.............................................................................11
Figure 10 –Pipe Mounting Bracket Secured to a Horizontal or Vertical Flat Pipe and Angle pipe....12
Figure 11 –HART/DE Transmitter Operating Ranges........................................................................13
Figure 12 –Transmitter 9-Screw Terminal Board and Grounding Screw ...........................................14
Figure 13 –STT750 Thermocouple, RTD, mV, ohm and Volt Connections ......................................17
Figure 14 –Current Loop Test Connections........................................................................................19
Figure 15 - Three-Button Option..........................................................................................................20
Figure 16 –Locating the Failsafe and Write Protect Jumpers..............................................................28
Figure 17 –Display with Process Variable Format..............................................................................30
Figure 18 –PWA Replacement............................................................................................................31
Figure 19 –Pipe and Wall Bracket Parts..............................................................................................37
Figure 20 –Electronic Housing, Display End......................................................................................38
Figure 21 –Electronic Housing, Terminal Block End.........................................................................39

Page x STT750 Temperature Transmitter User’s Manual Revision 4
List of Tables
Table 1 –Features and Options.............................................................................................................. 1
Table 2 –Available Display Characteristics.......................................................................................... 4
Table 3 –STT750 Standard Critical Diagnostics Messages.................................................................. 6
Table 4 –STT750 Standard Non-Critical Diagnostics Messages.......................................................... 6
Table 5 –Three-Button Option Functions........................................................................................... 21
Table 6 –Three-Button Data Entry...................................................................................................... 22
Table 7 –The Display Menus.............................................................................................................. 23
Table 8 –HART Failsafe and Write Protect Jumpers.......................................................................... 29
Table 9 –Fault Conditions and Recommended Corrective Actions.................................................... 35
Table 10 –Summary List of Recommended Spare Parts .................................................................... 36
Table 11 –Pipe and Wall Bracket Parts .............................................................................................. 38
Table 12 –Transmitter Major Assemblies........................................................................................... 38

Revision 4 STT750 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
STT750 SmartLine Temperature Transmitters.
1.2. Features and Options
The STT750 SmartLine Temperature Transmitter is available in a variety of models for measuring
Thermocouples, RTDs, millivolts and Ohm. Table 1 lists the protocols, Human-Machine Interface
(HMI), materials, approvals, and mounting bracket options for the STT750.
Table 1 –Features and Options
Feature/Option
Standard/Available Options
Communication Protocols
HART version 7
Human-Machine Interface (HMI)
Digital display
Three-button programming (optional)
Display language: English only
Calibration
Single
Approvals (See Appendix A for
details.)
ATEX, CSA, FM, IECEx
Mounting Brackets
Angle and flat pipe mounting and wall mounting brackets
in carbon steel and 316 stainless steel.
1.2.1. Physical Characteristics
As shown in Figure 1, the STT750 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 STT750 Temperature Transmitter User’s Manual Revision 4
Figure 1 –STT750 Major Assemblies
Figure 2 –Electronics Housing Components
1.2.2. Functional Characteristics
The Transmitter measures process Temperature and outputs a signal proportional to the measured
process variable (PV), including 4 to 20mA.
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.
Housing adapter
may not be present
on all models

Revision 4 STT750 Temperature Transmitter User’s Manual Page 3
1.3. STT750 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 STT750 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 A of this document for safety certification
requirements and details.
1.5. Transmitter Adjustments
Span adjustments are possible in STT750 SmartLine Temperature Transmitters with the optional
three-button assembly located at the top of the Electronic Housing (see Figure 2).
The user can also use the Honeywell MC Toolkit or other third-party hand-held to make any
adjustments to an STT750 SmartLine Temperature Transmitter.

Page 4 STT750 Temperature Transmitter User’s Manual Revision 4
1.6. Display
Table 2 –Available Display Characteristics
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 & %
Diagnostic messaging
1.7. Optional 3-Button Assembly
The optional 3-Button Assembly is located under the nameplate and 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.
oTransmitter calibration.
oDisplay configuration.
oSet span parameters.
oViewing transmitter parameters

Revision 4 STT750 Temperature Transmitter User’s Manual Page 5
2.Application Design
2.1. Overview
This section discusses the considerations involved with deploying a Honeywell STT750 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
2.2. Safety
2.2.1. Accuracy
The STT750 SmartLine Temperature Transmitter (Transmitter) measures the temperature of a process
and reports the measurement to a receiving device. Refer to STT750 Specification,
34-TT-03-16.
2.2.2. 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.
Problems detected as non-critical diagnostics may affect performance without driving the analog
output to the programmed burnout level (for HART). 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 protocols. HART diagnostic messages are
listed and described in the STT750 SmartLine Temperature Transmitter HART Option User Manual,
document number 34-TT-25-15.

Page 6 STT750 Temperature Transmitter User’s Manual Revision 4
Table 3 –STT750 Standard Critical Diagnostics Messages
Critical Diagnostics
(Failure Conditions)
Temperature Sensor Module Failure
Communication Module Failure
Sensor Comm. Timeout
Input Fault
Table 4 –STT750 Standard Non-Critical Diagnostics Messages
Non-Critical Diagnostics (Warning Conditions)
Excess Cal Correct
(Excess LRV Correct and/or Span correct for Sensor Input)
Input Out of Range
(Sensor Input Under Range or Over Range)
Sensor Module Over Temperature
Cold Junction Out of Range Error
Sensor Input TB5, TB6, TB7 Open (RTD and Ohm)
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
Internal Power Failure for Communication Module

Revision 4 STT750 Temperature Transmitter User’s Manual Page 7
3.Installation and Startup
3.1. Installation Site Evaluation
Evaluate the site selected for the STT750 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
3.2. Honeywell MC Toolkit
In preparation for post-installation processes, refer to the MC Toolkit (MCT404) User Manual,
Document # 34-ST-25-50, for battery conditioning and device operation and maintenance
information.
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.

Page 8 STT750 Temperature Transmitter User’s Manual Revision 4
3.4. Mounting STT750 SmartLine Temperature Transmitters
3.4.1. Summary
Transmitter models can be attached to a two-inch (50 millimeter) vertical or horizontal pipe using
Honeywell’s optional angle brackets.
Honeywell’s optional wall mounting bracket is also shown below:
TRANSMITTER ENCLOSURE CAN BE ROTATED A TOTAL OF 90O FROM THE
STANDARD MOUNTING POSITION
Figure 4 –STT750 with adapter housing - Horizontal Wall Mounting
Figure 5 –STT750 No-Adapter Horizontal Wall Mounting

Revision 4 STT750 Temperature Transmitter User’s Manual Page 9
Figure 6 –STT750 Pipe Mount with adapter housing - Horizontal & Vertical
Figure 7 –STT750 Pipe Mount, Vertical
*Note 1:Figure 6 and 7. The housing adapter may not be present on all transmitter models. If the
housing adapter is not present, subtract 24,5mm (0,96 inches) from the dimension specified.

Page 10 STT750 Temperature Transmitter User’s Manual Revision 4
3.4.2. 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 (Flat Pipe Mount), 50095918 (Wall Mount) and
50124813 (Angle Pipe Mount) for detailed mounting specifications.
Figure 8 –STT750 with adapter housing - Dimensions