Honeywell STT850 SMARTLINE User manual

STT850/750 Quick Start Guide 1
STT850/750 SmartLine Temperature Transmitter
Quick Start Guide
34-TT-25-04, Revision 12, August 2022
This document provides descriptions
and procedures for the Quick
Installation of Honeywell’s family of
SmartLine Temperature Transmitters.
The SmartLine Temperature
Transmitter is available in a variety of
models for measuring Ohms, mV and
temperature from RTD’s and
thermocouples.
For full details refer to the manuals
listed below for Protocols, User
Interface (HMI) Operation, Installation,
Configuration, Calibration,
Maintenance, Parts, Safety and
Approvals etc. including options.
Copyrights, Notices and Trademarks
Copyright 2022 by Honeywell
Revision 12, August 2022
Trademarks
SFC, SmartLine, STT850 are U.S.
registered trademarks of Honeywell
Inc.
HART® and FOUNDATION™
Trademarks of Field COMM Group™.
Table of Contents
URL..........................................................................................................1
Note:.........................................................................................................1
Installation................................................................................................1
Features and options...............................................................................1
Mounting the Transmitter.........................................................................1
Bracket Mounting.....................................................................................2
Optional Mounting Bracket ......................................................................2
Conduit Entry Plugs and Adapters ..........................................................2
Wiring Connections and Power Up .........................................................2
Wiring Variations......................................................................................3
Note: After wiring, torque the screws to around 4 to 5(lb-in). Maximum
should not exceed 1.1 Nm (10 lb-in). Don’t pull the wires after
connecting to the screw terminals...........................................................3
Input Sensor Wiring.................................................................................3
Digital Output Wiring................................................................................4
Setting Failsafe Direction and Write Protect Jumpers.............................4
Write Protect Jumper on Foundation Fieldbus (FF)................................5
Figures
Figure 1: Electronics Housing Components............................................1
Figure 2: STT housing - Horizontal Wall Mounting .................................1
Figure 3 - Angle Bracket Pipe Mount - Horizontal & Vertical ..................2
Figure 4: Pipe Mount - Horizontal & Vertical...........................................2
Figure 5: Flat and Angle Mounting Brackets secured to Horizontal or
Vertical Pipe.............................................................................................2
Figure 6: Electronic Housing Conduit Entries .........................................2
Figure 7: HART* and DE Transmitter Operating Ranges .......................2
Figure 8: Transmitter 9-Screw Terminal Board and Grounding Screw...3
Figure 9: HART*/DE/FF Single Input Wiring Diagram.............................3
Figure 10: DE Dual Input Wiring Diagram...............................................3
Figure 11: HART/FF –Dual Input Wiring Diagram.................................3
Figure 12: HART/FF Dual Input Wiring Diagram, mixed sensors...........3
Figure 13: Digital Output Connections for mA Load (HART only) ..........4
Figure 14: Digital Output Connections for PLC Counting Input (HART
only) .........................................................................................................4
Figure 15: Jumper Location HART/DE....................................................4
Figure 16: Jumper Settings .....................................................................4
Figure 17: Fieldbus Write Protect............................................................5
Documentation
To access complete documentation, including language variants, scan
the QR code below using your smart phone/device or QR code scanner.
Go to the APP store for your free Smartphone QR scanner
Or you can follow the URL to access the online SmartLine HUB page.
The HUB page will contain direct links to open SmartLine product
documentation.
URL QR Code
https://hwll.co/SmartLineHUB
Note:
This Quick Start Guide is for both STT850 and STT750 transmitters. Please note the
following do not apply to the STT750: Foundation Fieldbus, DE, Dual Inputs, Advanced
Display, Advanced Diagnostic, MID and Marine approvals.
Installation
Evaluate the site selected for the Transmitter installation with respect to the process system
design specifications and Honeywell’s published performance characteristics for your
particular model.
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 will show power up message as "SmartLine Temperature Transmitter”. If there
are any critical fault messages on the display, then refer to the STT850 Temperature
transmitter user's manual (34-TT-25-03) document for recommended corrective actions and
different screen formats.
Features and options
The STT850 and STT750 are 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 1 shows the assemblies in the
Electronics Housing with available options.
Figure 1: Electronics Housing Components
An optional 3-button assembly is located under the nameplate and provides a user interface
and operation capability without opening the transmitter to set up and make adjustments to
the transmitter.
Mounting the Transmitter
Transmitter models can be attached to a two-inch (50 millimeter) vertical or
horizontal pipe using Honeywell’s optional angle; alternately you can use your own
bracket.
Honeywell’s optional wall mounting bracket is also shown below:
For Housing without adaptor refer to Honeywell drawings 32306827 (No-Adaptor,
Pipe mount) and 32306828 (No-adaptor, Wall mount).
TRANSMITTER ENCLOSURE CAN BE ROTATED A TOTAL OF 90O FROM THE
STANDARD MOUNTING POSITION
Figure 2: STT housing - Horizontal Wall Mounting

STT850/750 Quick Start Guide 2
Figure 3 - Angle Bracket Pipe Mount - Horizontal & Vertical
Figure 4: Pipe Mount - Horizontal & Vertical
Bracket Mounting
If you are using an optional bracket, start with Step 1.
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) lock
washers, 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). Existing mounting bracket see
Figure 5.
Optional Mounting Bracket
Position bracket on 2-inch (50.8 mm) and install “U” bolt around pipe and through holes
in bracket. Secure with nuts and lock washers provided. Optional mounting bracket, see
Figure 5
HORIZONTAL FLAT PIPE VERTICAL FLAT PIPE
HORIZONTAL ANGLE PIPE VERTICAL ANGLE PIPE
Figure 5: Flat and Angle Mounting Brackets secured to Horizontal or Vertical Pipe
Conduit Entry Plugs and Adapters
Procedures
It is the User/Installer’s responsibility to install the Transmitters in accordance with
national and local code requirements. Conduit entry plugs and adapters shall be suitable
for the environment, shall be certified for the hazardous location when required and
acceptable to the authority having jurisdiction for the plant.
CONDUIT ENTRY PRECAUTIONARY NOTICE
THE CONDUIT/CABLE GLAND ENTRIES OF THIS PRODUCT ARE SUPPLIED WITH
PLASTIC DUST CAPS WHICH ARE NOT TO BE USED IN SERVICE.
IT IS THE USER’S RESPONSIBILITY TO REPLACE THE DUST CAPS WITH CABLE
GLANDS, ADAPTORS AND/OR BLANKING PLUGS WHICH ARE SUITABLE FOR THE
ENVIRONMENT INTO WHICH THIS PRODUCT WILL BE INSTALLED. THIS INCLUDES
ENSURING COMPLIANCE WITH HAZARDOUS LOCATION REQUIREMENTS AND
REQUIREMENTS OF OTHER GOVERNING AUTHORITIES AS APPLICABLE.
Figure 6: Electronic Housing Conduit Entries
Note: No plugs come installed in the housings. All housings come with temporary plastic
dust protectors (red) installed and are not certified for use in any installation.
- During installation it is mandatory to use the IP66/ TYPE 4X rated glands on both the
sides of conduit openings. The glands shall be properly tightened to avoid any air
passage.
- The End Cap and Front glass Cap of transmitter shall be properly tightened to ensure
no condensation forms inside the unit.
Wiring Connections and Power Up
Summary
The transmitter is designed to operate in a two-wire power/current loop with loop
resistance and power supply voltage within the HART and DE operating ranges shown
in Figure 7.
Figure 7: HART* and DE Transmitter Operating Ranges
*Only HART available for STT750 transmitter
For DE operation, add 3.0V to the Loadline values of 250 ohms and above.
Loop wiring is connected to the Transmitter by simply attaching the positive (+) and
negative (–) loop wires to the positive (+) and negative (–) terminals on the transmitter
terminal block in the Electronics Housing, shown in Figure 8.
Grounding Details:
Connect the Loop Power wiring shield to earth ground only at the power supply end.
Note: The transmitter is not polarity-sensitive.

STT850/750 Quick Start Guide 3
Figure 8: Transmitter 9-Screw Terminal Board and Grounding Screw
As shown in Figure 8, each Transmitter has an internal terminal to connect it to earth
ground. Connect sensor shield to the internal ground screw. The ground terminal can be
added to the outside of the Electronics Housing. Grounding the Transmitter for proper
operation is required, as doing so tends to minimize the possible effects of noise on the
output signal and affords protection against lightning and static discharge. An optional
lightning terminal block can be installed in place of the non-lightning terminal block for
Transmitters that will be installed in areas that are highly susceptible to lightning strikes. As
noted above, the Loop Power wiring shield should only be connected to earth ground at
the power supply end.
Wiring must comply with local codes, regulations and ordinances. Grounding
may be required to meet various approval body certification, for example CE
conformity. Refer to Appendix A of this document for details.
Note: Terminal #3 is for loop test and is not applicable for Fieldbus option.
Terminal #4 is for Digital Output and is not applicable for Fieldbus option.
Foundation Fieldbus not applicable to STT750
For HART and DE the Transmitter is designed to operate in a two-wire power/current loop
with loop resistance and power supply voltage within the operating range; see Figure 7
With an optional remote meter, the voltage drop for this must be added to the basic power
supply voltage requirements to determine the required Transmitter voltage and maximum
loop resistance. Additional consideration is required when selecting intrinsic safety barriers
to ensure that they will supply at least minimum Transmitter voltage, including the required
250 ohms of resistance (typically within the barriers) needed for digital communications.
Wiring Variations
The above procedures are used to connect power to a Transmitter. For loop wiring and
external wiring, detailed drawings are provided for Transmitter installation in
non-intrinsically safe areas and for intrinsically safe loops in hazardous area locations.
This procedure shows the steps for connecting power to the transmitter.
Wiring must comply with local codes, regulations and ordinances. Grounding
may be required to meet various approval body certification, for example CE
conformity. Refer to the SmartLine Transmitter User’s Manual 34-TT-25-03
(STT850) or 34-TT-25-13 (STT750) for details.
Note: After wiring, torque the screws to around 4 to 5(lb-in). Maximum should not
exceed 1.1 Nm (10 lb-in). Don’t pull the wires after connecting to the screw terminals.
Input Sensor Wiring
Connect the input sensors as shown in Figures below:
Sensor Grounding:
1. For ungrounded Thermocouple, mV, RTD or ohm inputs connect the input
wiring shield(s) to the Internal Ground Connection shown in Figure 8.
2. For grounded Thermocouple inputs, ground the sensor wiring shield at the
sensor.
Ensure the sensor wiring and signal wiring shield is electrically isolated from the
transmitter housing and other grounded fixtures
Figure 9:HART*/DE/FF Single Input Wiring Diagram.
*Only HART available for STT750 transmitter
Figure 9: HART*/DE/FF Single Input Wiring Diagram
RTD Thermocouple, mV and Ohm Connections
Figure 10:DE Dual Input Wiring Diagram
•Resistance temperature detector (RTD) measurements use the 3 or 4 wire
approach.
•Dual-input units wired for a 4-wire RTD will automatically disable Input 2.
•DE dual input device needs to be power cycled whenever sensor input wiring
changed
•Supports dual thermocouple or RTD inputs for differential temperature
measurement
•Supports dual thermocouple sensor inputs for redundant sensor operation.
•To operate DE dual input device, it is required to connect both sensor inputs
•To minimize common noise problems in the application, a strap/jumper
should be wired between terminals 6 and 8.
For differential T/C operation on DE Models, a second strap/jumper should be wired
between terminals 6 and 7. Do not install this strap for Non-DE models. The output for
differential operation is calculated as T/C 1 - T/C 2.
Figure 10: DE Dual Input Wiring Diagram
Thermocouple and RTD Connections (not applicable to single input sensor)
DE not applicable to STT750 transmitter
Figure 11: HART/FF –Dual Input Wiring Diagram
RTD Thermocouple, mV and Ohm Connections
Note: Dual Input is not available on the STT750.
Figure 12:HART/FF Dual Input Wiring Diagram
•For External C/J compensation, the first input is a thermocouple
type, and the second input is a 3-wire PT100 ohm RTD
•The STT850 can have different sensor types on its inputs for split
range or averaging applications
Figure 12: HART/FF Dual Input Wiring Diagram, mixed sensors
Remote C/J and Mixed Sensors Connections

STT850/750 Quick Start Guide 4
Digital Output Wiring
Digital Output is available only on STT850 HART transmitters. The Digital Output
should not use the same power supply as used to support the 4-20mA transmitter
output. See Figure 13 and Figure 14.
For Intrinsically Safe (IS) applications, the 4-20mA and the Digital Output must use
separate IS Barriers.
Figure 13: Digital Output Connections for mA Load (HART only)
For best performance, it is recommended that:
•Digital Output wires should be in a separate shielded twisted pair cable, do
not use the same cable as used for the Loop or the Sensor wires
•If using the same power supply to operate both the 4-20mA Loop and the
Digital Output, then make the interconnections to the power supply terminals
directly at the power supply
Note: Intrinsically Safe Installations require the use of separate IS Barriers for the 4-20mA
output and for the Digital Output connections
Figure 14: Digital Output Connections for PLC Counting Input (HART only)
Explosion-Proof Conduit Seal
When installed as explosion proof in a Division 1 Hazardous Location, keep
covers tight while the Transmitter is energized. Disconnect power to the
Transmitter in the non-hazardous area prior to removing end caps for service.
When installed as non-incendive equipment in a Division 2 hazardous location,
disconnect power to the Transmitter in the non-hazardous area, or determine that the
location is non-hazardous before disconnecting or connecting the Transmitter wires.
Transmitters installed as explosion proof in Class I, Division 1, Hazardous (classified)
locations in accordance with ANSI/NFPA 70, the US National Electrical Code, require a
LISTED explosion proof seal to be installed in the conduit, within 18 inches (457.2 mm)
of the Transmitter when ¾ inch NPT conduit is used. Crouse-Hind’s type EYS/EYD or
EYSX/EYDX are examples of LISTED explosion proof seals that meet this requirement.
Transmitters installed as explosion proof with ½ inch NPT conduit, in Class I, Division
1, hazardous (classified) locations follow that of NFPA 70 for installation of explosion
proof seal.
Step
Action
1
See Figure 8, above, for parts locations. Loosen the end cap lock
using a 1.5 mm Allen wrench.
2
Remove the end cap cover from the terminal block end of the
Electronics Housing
3
Feed loop power leads through one end of the conduit entrances on
either side of the Electronics Housing. The Transmitter accepts up to
16 AWG wire.
4
Connect the positive loop power lead to the positive (+) terminal and
the negative loop power lead to the negative (-) terminal. Note that
the Transmitter is not polarity-sensitive.
Shielded, twisted-pair cable such as Belden 9318 or equivalent must
be used for all signal/power wiring.
Note: If solid core wire is used strip insulation 1/4 in (6 mm). Once
inserted under the square washer the stripped portion should be
contained under the square washer. If multi-stranded wire is used, a
ferrule is to be used and the stripped wire should be in the insulated
portion of the ferrule. The ferrule can also be used on the solid core
wire.
After wiring the Transmitter as outline in the next sections, torque the
screws to around 4 to 5(lb-in).
Max should not exceed 1.1 Nm (10 lb-in).
Don’t pull the wires after connecting to the screw terminals.
5
Feed input sensor wires through the 2nd conduit entrance and
connect wire per wiring diagrams
6
Replace the end cap, and secure it in place
Note: Terminal Screw#6 has thermal paste on the tip of screw intentionally to
improve the performance of the transmitter. Do not remove or clean the thermal
paste.
Configuration Guide
This transmitter comes with a standard factory configuration. Consult the nameplate for
basic information. Reconfiguration for your particular application can be accomplished
by following instructions in the Transmitter User’s manual. This can be found by
following the website URL or QR code on page 1 of this document.
Set the Jumpers For HART/DE
Setting Failsafe Direction and Write
Protect Jumpers
The SmartLine Temperature Transmitter
(DE or HART) provides two jumpers to
set the desired failsafe action and Write
Protect option. See Figure 15.
The top jumper on the electronics
module sets the Failsafe direction. The
default setting is up-scale failsafe.
Up Scale drives the loop to a value
greater than 21mA while Down Scale
drives the loop to a value less than
3.8mA.
You can change the failsafe direction by
moving the Failsafe Jumper (top jumper)
to the desired position (UP or DOWN).
If your transmitter is operating in DE
mode, the upscale failsafe action will
cause the transmitter to generate a
“+ infinity” digital signal, while a
downscale failsafe will cause the
transmitter to generate a “– infinity”
digital signal.
The bottom jumper sets the Write
Protect. The default setting is OFF (Un-
protected).
When set to the ON (Protected) position,
changed configuration parameters
cannot be written to the transmitter.
When set to the OFF (Un-protected)
position, changed configuration
parameters can be written to the
transmitter.
ATTENTION: Electrostatic
Discharge (ESD) hazards. Observe
precautions for handling
electrostatic sensitive devices
Step
Action
1
Turn OFF Transmitter power.
2
Loosen the end-cap lock and
unscrew the end cap from the
Electronics side of the Transmitter
housing.
3
If there is a Display module,
carefully depress the tabs on the
sides of the Display Module and
pull it off.
If necessary, move the interface
connector from the Communication
Module. Do not discard connector
4
Set the Failsafe Jumper (top
jumper) to the desired action (UP
or DOWN). And the Write Protect
jumper (Bottom jumper) to the
desired behavior (Protected or
Unprotected) See Figure 16 for
jumper positioning.
5
If applicable, re-install the Display
module as follows:
•Orient the display as desired.
•Install the Interface Connector in
the Display module such that it will
mate with the socket for the display
in the Communication module.
•Carefully line up the display and
snap it into place. Verify that the
two tabs on the sides of the display
latch.
6
Screw on the end cap and tighten
the end-cap lock. Turn ON
Transmitter power.
Figure 15: Jumper Location HART/DE
Jumper Settings
Description
Failsafe = UP (High)
Write Protect = OFF (Not Protected)
Failsafe = DOWN (Low)
Write Protect = OFF (Not Protected)
Failsafe = UP (High)
Write Protect = ON (Protected)
Failsafe = DOWN (Low)
Write Protect = ON (Protected)
Figure 16: Jumper Settings

STT850/750 Quick Start Guide 5
Write Protect Jumper on Foundation Fieldbus (FF)
On Foundation Fieldbus transmitters there is no Failsafe jumper selection but there is
a Write Protect jumper.
The bottom jumper sets the Write Protect. The default setting is OFF (Un-protected).
When set to the ON (Protected) position, changed configuration parameters cannot be
written to the transmitter.
When set to the OFF (Un-protected) position, changed configuration parameters can
be written to the transmitter.
Fieldbus not applicable to STT750
ATTENTION: Electrostatic Discharge (ESD) hazards. Observe
precautions for handling electrostatic sensitive devices.
WARNING! PERSONAL INJURY: Risk of electrical shock. Disconnect
power before proceeding. HAZARDOUS LIVE voltages greater than
30 Vrms, 42.4 Vpeak, or 60 VDC may be accessible. Failure to
comply with these instructions could result in death or serious injury.
Step
Action
1
Turn OFF Transmitter power.
2
Loosen the end-cap lock and unscrew the end cap from the
Electronics side of the Transmitter housing.
3
If applicable, carefully depress the tabs on the sides of the Display
Module and pull it off. If necessary, move the interface connector from
the Communication Module to the display module to provide the
preferred orientation of the display module in the window.
If necessary, move the interface connector from the Communication
Module to the display module to provide the preferred orientation of
the display module in the window.
4
Set the Write Protect jumper (Bottom jumper) to the desired behavior
(Protected or Unprotected). See Figure 17 for jumper positioning.
5
Screw on the end cap and tighten the end-cap lock.
6
Turn ON Transmitter power.
Image
Description
Fieldbus SIM Mode = OFF
Write Protect = OFF (Not Protected)
Fieldbus SIM Mode = OFF
Write Protect = ON (Protected)
Fieldbus SIM Mode = ON
Write Protect = OFF (Not Protected)
Figure 17: Fieldbus Write Protect
Appendix A. PRODUCT CERTIFICATIONS
A1. Safety Instrumented Systems (SIS) Installations
For Safety Certified Installations, please refer to STT850/750 Safety Manual
#34-TT-25-05 for installation procedure and system requirements.
A2. European Directive Information (EU)

STT850/750 Quick Start Guide 6
A3. Hazardous Locations Certifications
MSG TABLE
III/ AGENCY
TYPE OF
PROTECTION
COMM
OPTION
Electrical
Parameters
Ambient
Temperature
A/ FM
Approvals
TM (USA)
Explosion proof,
Certificate:
FM16US0157X:
Class I, Division 1,
Groups A, B, C, D;
Dust Ignition Proof:
Class II, III, Division 1,
Groups E, F, G; T6..T5
Class 1, Zone 1, AEx db
IIC T6..T5 Gb
Zone 21, AEx tb IIIC T
95oC Db
4-20 mA/
DE/HART/
FF/
PROFIBUS
Note 1
T95oC, T5: Ta=
-50oC to 85oC
T6: Ta= -50oC
to 65oC
Intrinsically Safe,
Certificate:
FM16US0157X:
Class I, II, III, Division 1,
Groups A, B, C,
D, E, F, G; T4
Class I Zone 0 AEx ia IIC
T4 Ga
FISCO Field Device
(Only for FF Option)
Class I Zone 0 AEx ia IIC
T4 Ga
4-20 mA/
DE/HART
/FF/
PROFIBUS
Note 2
-50oC to 70oC
FISCO:
-50oC to 45oC
Non-Incendive,
Certificate:
FM16US0157X:
Class I, Division 2,
Groups A, B, C, D; T4
Class I Zone 2 AEx nA
IIC T4 Gc
Class I Zone 2 AEx ic IIC
T4 Gc
4-20 mA/
DE/HART
/FF/
PROFIBUS
Note 1
“ic” Note 2
-50oC to 85oC
Enclosure: Type 4X/
IP66/ IP67
ALL
ALL
ALL
Standards:
FM 3600:2018; ANSI/ ISA 60079-0: 2013 ; FM 3615:2018; ANSI/ ISA 60079-1 :
2015 ; FM 3616: 2011; ANSI/ ISA 60079-31: 2015 ; FM 3610:2010; ANSI/ ISA
60079-11: 2014; FM 3810 : 2018 ; FM 3611:2004; ANSI/ ISA 60079-15 : 2012;
FM 3810: 2005 ; NEMA 250: 2003; ANSI/ IEC 60529: 2004
B/ CSA-
Canada
Explosion proof, Certificate:
2689056:
Class I, Division 1, Groups A,
B, C, D;
Dust Ignition Proof:
Class II, Division 1, Groups E,
F, G; Class III, Division 1 ;T4
Class I Zone 1 AEx db IIC
T6..T5 Gb
Zone 21 AEx tb IIIC T 95oC Db
Ex db IIC T6..T5 Gb
Ex tb IIIC T 95oC Db
4-20 mA/
DE/HART/FF
Note 1
T 95oC , T5: Ta=
-50oC to 85oC
T6: Ta= -50oC to
65oC
Intrinsically Safe, Certificate:
2689056:
Class I, II, III, Division 1,
Groups A, B, C, D, E, F, G; T4
Class I Zone 0 AEx ia IIC T4 Ga
Class I Zone 2Ex ic IIC T4 Gc
Ex ia IIC T4 Ga
Ex ic IIC T4 GcFISCO Field
Device (Only for FF Option)
Class I Zone 0 AEx ia IIC T4 Ga
Class I Zone 2Ex ic IIC T4 Gc
Ex ia IIC T4 Ga
Ex ic IIC T4 Gc
4-20 mA/
DE/HART/FF
Note 2
-50oC to 70oC
FISCO:
-50oC to 45oC
Non-Incendive, Certificate:
2689056:
Class I, Division 2, Groups A,
B, C, D; T4
Class I Zone 2 AEx nA IIC T4
Gc
Ex nA IIC T4 Gc
4-20 mA/
DE/HART/FF
Note 1
-50oC to 85oC
Enclosure: Type 4X/ IP66/
IP67
ALL
ALL
ALL
Standards:
CSA C22.2 No. 0-10; CSA 22.2 No. 25-1966 (reaffirmed 2009); CSA C22.2 No.
30-M1986 (reaffirmed 2012); CSA C22.2 No. 94-M91; CSA C22.2 No.61010-1:
2012; CSA-C22.2No.157-92 (reaffirmed 2016); C22.2 No. 213-2017; C22.2 No.
60529-2016; C22.2 No. CSA 60079-0:2015; C22.2 No. 60079-1: 2016; C22.2 No.
60079-11: 2014; C22.2 No. 60079-15: 2012; C22.2 No. 60079-31: 2015;
ANSI/ ISA12.12.01-2017; ANSI/ ISA 60079-0 (12.00.01): 2013; ANSI/ UL60079-1:
2015; ANSI/ ISA 60079-11(12.02.01) : 2012; ANSI/ ISA 60079-15(12.12.02) : 2012;
ANSI/ ISA 60079-31: 2015; FM Class 3615: Aug 2006; FM Class 3616: Dec 2011;
ANSI/ IEC 60529: Edition 2.1; ANSI/ UL 913: 2015; ANSI/UL 61010-1: 2016;
UL 50: Ed 11

STT850/750 Quick Start Guide 7
C/
ATEX
Flameproof, Sira 14ATEX2046X:
II 2 GD
Ex db IIC T6..T5 Gb
Ex tb IIIC T 95oC Db
4-20 mA/
DE/HART/FF
Note 1
T 95oC ,T5: Ta=
-50oC to 85oC
T6: Ta= -50oC to
65oC
Intrinsically Safe, Sira
14ATEX2046X:
II 1 GD
Ex ia IIC T4 Ga
Ex ia IIIC T 95oC Da
FISCO Field Device (Only for FF
Option)
Ex ia IIC T4 Ga
4-20 mA/
DE/HART/FF
Note 2
-50oC to 70oC
FISCO:
-50oC to 45oC
Enclosure: IP66/ IP67
ALL
ALL
ALL
Standards: EN IEC 60079-0:2018; EN 60079-1:2014; EN 60079-11:2012; EN 60079-
31:2014
Increase Safety/ Intrinsically
Safe, Sira 14ATEX4052X:
II 3 G
Ex ec IIC T4 Gc
Ex ic IIC T4 Gc
FISCO Field Device (Only for FF
Option)
Ex ic IIC T4 Gc
4-20 mA/
DE/HART
FF
Note 1
“ic” Note
2
-50oC to 85oC
FISCO:
-50oC to 45oC
Enclosure: IP66/ IP67
ALL
ALL
ALL
Standards:
EN IEC 60079-0:2018; EN 60079-7:2015; EN 60079-11:2012
C/
UKCA
Flameproof, CSAE 22UKEX1035X
II 2 GD
Ex db IIC T6..T5 Gb
Ex tb IIIC T 95oC Db
4-20 mA/
DE/HART/FF
Note 1
T 95oC ,T5: Ta=
-50oC to 85oC
T6: Ta= -50oC to
65oC
Intrinsically Safe, CSAE
22UKEX1035X
II 1 GD
Ex ia IIC T4 Ga
Ex ia IIIC T 95oC Da
FISCO Field Device (Only for FF
Option)
Ex ia IIC T4 Ga
4-20 mA/
DE/HART/ FF
Note 2
-50oC to 70oC
FISCO:
-50oC to 45oC
Increase Safety/ Intrinsic Safety:
CSAE 22UKEX1009X
II 3 G
Ex ec IIC T4 Gc
Ex ic IIC T4 Gc
FISCO Field Device (Only for FF
Option)
Ex ic IIC T4 Gc
4-20 mA/
DE/HART/ FF
Note 1
“ic” Note 2
-50oC to 85oC
FISCO:
-50oC to 45oC
Enclosure: IP66/ IP67
ALL
ALL
ALL
Standards:
EN IEC 60079-0:2018; EN 60079-1:2014; EN 60079-11:2012; EN 60079-31:2014
D/
IECEx
Flameproof, SIR 14.0020X
Ex db IIC T6..T5 Gb
Ex tb IIIC T 95oC Db
4-20 mA/
DE/HART/FF
Note 1
T 95oC ,T5: Ta=
-50oC to 85oC
T6: Ta= -50oC
to 65oC
Intrinsically Safe, SIR 14.0020X
Ex ia IIC T4 Ga
Ex ia IIIC T4 Da
FISCO Field Device (Only for FF
Option)
Ex ia IIC T4 Ga
4-20 mA/
DE/HART/
FF
Note 2
-50oC to 70oC
FISCO:
-50oC to 45oC
Increase Safety/ Intrinsic
Safety: SIR 14.0020X
Ex ec IIC T4 Gc
Ex ic IIC T4 Gc
FISCO Field Device (Only for FF
Option)
Ex ic IIC T4 Gc
4-20 mA/
DE/HART/
FF
Note 1
“ic” Note
2
-50oC to 85oC
FISCO:
-50oC to 45oC
Enclosure: IP66/ IP67
ALL
ALL
ALL
Standards:
EN IEC 60079-0:2018; IEC 60079-1:2014; IEC 60079-11:2011; IEC 60079-
31:2013; IEC 60079-7: 2015
E/
SAEx
(South
Africa)
Flameproof:
Ex db IIC T6..T5 Gb
Ex tb IIIC T 95oC Db
4-20 mA/
DE/HART/F
F
Note 1
T 95oC ,T5: Ta=
-50oC to 85oC
T6: Ta= -50oC
to 65oC
Intrinsically Safe:
Ex ia IIC T4 Ga
Ex ia IIIC T4 Da
FISCO Field Device (Only for FF
Option)
Ex ia IIC T4 Ga
4-20 mA/
DE/HART/F
F
Note 2
-50oC to 70oC
FISCO:
-50oC to 45oC
Increase Safety/ Intrinsic Safety
Ex ec IIC T4 Gc
Ex ic IIC T4 Gc
FISCO Field Device (Only for FF
Option)
Ex ic IIC T4 Gc
4-20 mA/
DE/HART/F
F
Note 1
-50oC to 85oC
FISCO:
-50oC to 45oC
Enclosure: IP66/ IP67
ALL
ALL
ALL
F/
INMET
RO
Flameproof:
Ex db IIC T6..T5 Gb
Ex tb IIIC T 95oC Db
4-20 mA/
DE/HART/
FF
Note
1
T 95oC ,T5: Ta=
-50oC to 85oC
T6: Ta= -50oC
to 65oC
Intrinsically Safe:
Ex ia IIC T4 Ga
Ex ia IIIC T4 Da
FISCO Field Device (Only for FF
Option)
Ex ia IIC T4 Ga
4-20 mA/
DE/HART/
FF
Note
2
-50oC to 70oC
FISCO:
-50oC to 45oC
Non Sparking:
Ex ec IIC T4 Gc
Ex ic IIC T4 Gc
FISCO Field Device (Only for FF
Option)
Ex ic IIC T4 Gc
4-20 mA/
DE/HART/
FF
Note 1
-50oC to 85oC
FISCO:
-50oC to 45oC
Enclosure: IP66/ IP67
ALL
ALL
ALL
G/ NEPSI
(CHINA)
Flameproof:
Ex d IIC T6..T5 Gb
Ex tD A21 IP66/IP67 T95oC
4-20 mA/
DE/HART/
FF
Note 1
T 95oC,T5: Ta= -
50oC to 85oC
T6: Ta= -50oC to
65oC
Intrinsically Safe:
Ex ia IIC T4 Ga
Ex ia 20 T95oC
FISCO Field Device (Only for FF
Option)
Ex ia IIC T4 Ga
4-20 mA/
DE/HART/
FF
Note 2
-50oC to 70oC
FISCO:
-50oC to 45oC
Non Sparking/ Intrinsic Safety:
Ex nA IIC T4
Ex ic IIC T4 Gc
4-20 mA/
DE/HART/
FF
Note 1
-50oC to 85oC
Enclosure: IP66/ IP67
ALL
ALL
ALL
H/ KOSHA
(KOREA)
Flameproof:
Ex d IIC T4 Gb
Ex tD A21 T 95oC IP 66/ IP67
4-20 mA/
DE/HART/FF
Note 1
-50oC to 85oC
Intrinsically Safe:
Ex ia IIC T4
FISCO Field Device (Only for FF
Option)
Ex ia IIC T4
4-20 mA/
DE/HART/FF
Note 2
-50oC to 70oC
FISCO:
-50oC to 45oC
Enclosure: IP66/ IP67
ALL
ALL
ALL
J/ EAC Ex
(Russia,
Belarus
and
Kazakhsta
n)
Flameproof:
1 Ex d IIC T4 Gb
Ex tb IIIC T95oC Db
4-20 mA/
DE/HART/FF
Note 1
-50oC to 85oC
Intrinsically Safe:
0 Ex ia IIC T4 Ga
Ex ia IIIC T4 Db
FISCO Field Device (Only for FF
Option)
0 Ex ia IIC T4 Ga
4-20 mA/
DE/HART/FF
Note 2
-50oC to 70oC
FISCO:
-50oC to 45oC
Non Sparking:
2 Ex nAc IIC T4
4-20 mA/
DE/HART/FF
Note 1
-50oC to 85oC
Enclosure: IP66/ IP67
ALL
ALL
ALL
P/ CCoE
(India)
Ex ia IIC T4 Ga
FISCO Field Device (Only
for FF Option)
Ex ia IIC T4 Ga
4-20 mA/
DE/HART/FF
Note 2
-50oC to 70oC
FISCO:
-50oC to 45oC
Ex d IIC T4 Gb
4-20 mA/
DE/HART/FF
Note 1
-50oC to 85oC
BIS Certification
“For details of BIS certification please visit www.bis.gov.in”
Notes
1. Operating Parameters:
4-20 mA HART (Loop Terminal)
Voltage= 11.8 to 42.4 V at terminals
Current= 4-20 mA Normal (3.8 –23 mA Faults)
DE Model (Loop Terminal)
Voltage= 15 V to 42.4 V at terminals
Current= 4-20 mA Normal (3.8 –23 mA Faults)
FF Model (Loop Terminal)
Voltage= 9 to 32 V Current= 25 mA
2. Intrinsically Safe Entity Parameters
See Control Drawing in section A.6
SIL 2/3
Certification
IEC 61508 SIL 2 for non-redundant use and SIL 3 for redundant use
according to EXIDA and TÜV Nord Sys Tec GmbH & Co. KG under the
following standards: IEC61508-1: 2010; IEC 61508-2: 2010; IEC61508-3:
2010.
MID Approval
(not STT750)
Issued by NMi Certin B.V. in accordance with WELMEC guide 8.8, OIML
R117.1 Edition 2007 (E), and EN 12405-1+A2 Edition 2006. Applicable to
Pt100 sensor only.
MARINE TYPE
APPROVAL
Lloyd’s Register Certificate Number: 16/60011
Environmental categories ENV1, ENV2, ENV3 and ENV5 as defined in
Lloyd’s Register Test Specification No. 1, February 2015
A4. Marking ATEX Directive
General: The following information is provided as part of the labeling of the transmitter:
• Name and Address of the manufacturer
• Notified Body identification: DEKRA Quality B.V., Arnhem, the Netherlands
• For complete model number, see the Model Selection Guide for the model of
Temperature Transmitter
• The serial number of the transmitter is located on the Housing data-plate. The
first two digits of the serial number identify the year (02) and the second two digits
identify the week of the year (23); for example, 0223xxxxxxxx indicates that the
product was manufactured in 2002, in the 23 rd week.

STT850/750 Quick Start Guide 8
Apparatus Marked with Multiple Types of Protection
The user must determine the type of protection required for installation the
equipment. The user shall then check the box [󲐀] adjacent to the type of
protection used on the equipment certification nameplate. Once a type of
protection has been checked on the nameplate, the equipment shall not then be
reinstalled using any of the other certification types.
WARNINGS and Cautions:
Intrinsically Safe and Non-Incendive Equipment:
WARNING: SUBSTITUTION OF COMPONENTS MAY IMPAIR
SUITABILITY FOR USE IN HAZARDOUS LOCATIONS.
Explosion-Proof/ Flameproof:
WARNING: DO NOT OPEN WHEN AN EXPLOSIVE ATMOSPHERE
MAY BE PRESENT
Non-Incendive Equipment:
WARNING: DO NOT OPEN WHEN AN EXPLOSIVE ATMOSPHERE
MAYBE PRESENT
All Protective Measures:
WARNING: FOR CONNECTION IN AMBIENTS ABOVE 60oC USE
WIRE RATED 105oC
A.5 Conditions of Use” for Ex Equipment”, Hazardous Location Equipment or “Schedule of
Limitations”:
Consult the manufacturer for dimensional information on the flameproof joints for
repair.
Painted surface of the STT850 may store electrostatic charge and become a source of
ignition in applications with a low relative humidity less than approximately30%
relative humidity where the painted surface is relatively free of surface
contamination such as dirt, dust or oil. Cleaning of the painted surface should only be
done with a damp cloth.
Intrinsically Safe: Must be installed per drawing 50091227
Division 2: This equipment is suitable for use in a Class I, Division 2, Groups A, B, C, D;
T4 or Non-Hazardous Locations Only.
The installer shall provide transient over-voltage protection external to the
equipment such that the voltage at the supply terminal of the equipment does not
exceed 140% of the voltage rating of the equipment.
The enclosure is manufactured from low copper aluminum alloy. In rare cases,
ignition sources due to impact and friction sparks could occur. This shall be
considered during Installation, particularly if equipment is installed a Zone 0 location.
If a charge-generating mechanism is present, the exposed metallic part on the enclosure is
capable of storing a level of electrostatic that could become incendive for IIC gases. Therefore,
the user/ installer shall implement precautions to prevent the buildup of electrostatic charge,
e.g. earthing the metallic part. This is particularly important if equipment is installed a Zone 0
location.
A.6. ControlDrawing

STT850/750 Quick Start Guide 9

STT850/750 Quick Start Guide 10

For more information
To learn more about SmartLine Transmitters,
visit https://process.honeywell.com
Or contact your Honeywell Account Manager
Process Solutions
Honeywell
2101 City West Blvd
Houston, TX 77042
Honeywell Control Systems Ltd
Honeywell House, Skimped Hill Lane
Bracknell, England, RG12 1EB
34-TT-25-04, Rev.12
August 2022
©2022 Honeywell International Inc.
Shanghai City Centre, 100 Jungi Road
Shanghai, China 20061
https://process.honeywell.com
Sales and Service
For application assistance, current specifications, pricing, or name of the nearest
Authorized Distributor, contact one of the offices below.
ASIA PACIFIC (TAC) [email protected]
Australia Honeywell Limited, Phone: +(61) 7-3846 1255, FAX: +(61) 7-3840 6481
Toll Free 1300-36-39-36, Toll Free Fax: 1300-36-04-70
China –PRC –Shanghai, Honeywell China Inc. Phone: [phone],
Fax: [phone]
Singapore, Honeywell Pte Ltd. Phone: +(65) 6580 3278. Fax: +(65) 6445-3033
South Korea, Honeywell Korea Co Ltd. Phone:+[phone]. Fax:+[phone]
EMEA, Phone: + 80012026455 or [phone]. FAX: [phone]
Email: (Sales) [e-mail]
or (TAC) [email protected]
Web: Knowledge Base search engine http://bit.ly/2N5Vldi
AMERICAS, Honeywell Process Solutions, Phone: [phone],
or 1-215/641-3610. (TAC) [email protected].
Sales 1-800-343-0228. Email: (Sales) [email protected]
Web: Knowledge Base search engine http://bit.ly/2N5Vldi
WARRANTY/REMEDY
Honeywell warrants goods of its manufacture as being free of defective materials and faulty
workmanship. Contact your local sales office for warranty information.
If warranted goods are returned to Honeywell during the period of coverage, Honeywell will
repair or replace without charge those items it finds defective. The foregoing is Buyer's sole
remedy and is in lieu of all other warranties, expressed or implied, including those of
merchantability and fitness for a particular purpose. Specifications may change without
notice. The information we supply is believed to be accurate and reliable as of this printing.
However, we assume no responsibility for its use.
While we provide application assistance personally, through our literature and the
Honeywell web site, it is up to the customer to determine the suitability of the product in the
application.