Honeywell SmartLine STT850 Smart Temperature Transmitter

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Price $1,719.00

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Smart temperature transmitter, single or dual universal input, 4-20 mA and HART or Honeywell DE protocols, or Foundation Fieldbus. 125 mSec update time, digial accuracy to ±0.10° C (Pt100Ω). Replaces the retired Honeywell STT350 temperature transmitter.

Honeywell SmartLine STT850 temperature transmitters deliver high accuracy and stability across a wide ambient temperature range. Built on the SmartLine modular platform, they include polarity insensitive wiring connections and built-in diagnostics for low total cost of ownership and easy maintenance.

  • Single or dual universal input for RTDs, thermocouples, mV, and Ohms
  • Digital accuracy up to 0.1°C for RTD
  • 125 mSec update time for single inputs, 250 mSec update for dual inputs
  • Stability up to ±0.01% upper range limit per year for 10 years
  • Advanced graphics LCD display: Up to 8 display screens, two line x 16 character, displays up to six data points, and can rotate 0°, 90°, 180°, or 270° position for optimal visibility
  • Integral three-button configuration for zero, span, and other options
  • For HART configuration, use handheld HART communicator, Field Device Manager (FDM), or Pactware with a HART modem. For DE configuration, use Honeywell SCT3000 software. For Foundation Fieldbus, use FDM
  • Dual input for differential, averaging, redundant, or split range measurement
  • Built-in galvanic isolation and sensor break protection
  • Comprehensive on-board diagnostics for transmitter and sensors
  • 4-20 mA DC analog output, HART 7 and digital output, Honeywell DE, and Foundation Fieldbus models
  • Alarms for PV high, PV low, critical diagnostics, redundant input, PV rate of change, PV deviation
  • Dual compartment housing
  • Full compliance to SIL 2/3 requirements
  • FM, CSA, ATEX, IECEx approvals
Retired Honeywell STT350 smart temperature transmitterRetired Honeywell STT350 smart temperature transmitter
Replaces the retired Honeywell STT350 temperature transmitter

Model Selection Guide

Use this table to find the right model for your application.  Don't see the option you need? Call a Lesman sales specialist at 800-953-7626.

Make one selection from each table section below to build your complete model number. Make note of the Availability column to be sure you're building a valid transmitter. A complete STT850 model number looks like this: STT750- _ - _- _ -_ _ _- _ _ _ - _ - _ _ _ _ - _ _ - 0000

DescriptionCatalog NumberAvailability
Temperature Transmitter, Universal Input, Factory Standard ConfigurationSTT850
InputsSingle Temperature InputS-
Dual Temperature InputsT-e
Digital OutputNo Digital Output0-
With Digital Output1-a
FM ApprovedA-e
CSA ApprovedB-
ATEX ApprovedC-
IECEx ApprovedD-
Electronic HousingAluminum Housing, 1/2" NPT ConnectionA _ _ -
Aluminum Housing, 1/2" NPT Connection, Lightning ProtectionC _ _-
316 Stainless Steel Housing, 1/2" NPT ConnectionE _ _ -
316 Stainless Steel Housing, 1/2" NPT Connection, Lightning ProtectionG _ _ -
Output4-20 mA DC Analog Output, HART Protocol_ H _ -
4-20 mA DC Analog Output, Honeywell DE Protocol_ D _ -
Foundation Fieldbus Digital Protocol_ F _-
InterfaceNo Indicator, No Configuration Buttons_ _ 0-
No Indicator, Zero/Span Configuration Buttons_ _ A-f
Basic Digital Indicator, No Configuration Buttons_ _B-
Basic Digital Indicator, Configuration Button Interface_ _ C-
Advanced Digital Indicator, No Configuration Button Interface_ _ D-
Advanced Digital Indicator, Configuration Button Interface_ _ E-
DiagnosticsStandard Diagnostics1 _ _-
Advanced Diagnostics: Rate of Change and Deviation Alarm2 _ _-c
ConfigurationNo Write Protection, Fail High, Standard High/Low Output Limits_ 1S-f
No Write Protection, Fail Low, Standard High/Low Output Limits_ 2S-f
Write Protection, Fail High, Standard High/Low Output Limits_ 3S-f
Write Protection, Fail Low, Standard High/Low Output Limits_ 4S-f
Write Protection, Fieldbus High/Low Output Limits_ 5S-g
No Write Protection, Fieldbus High/Low Output Limits_ 6S-g
CalibrationFactory Standard Single CalibrationA-
Custom Single Calibration (Unit Data Required)B-
Mounting BracketNone0 _ _ _-
Carbon Steel Flat Pipe Mounting Bracket1 _ _ _-
Carbon Steel Angle Pipe Mounting Bracket2 _ _ _-
Carbon Steel Wall Mounting Bracket5 _ _ _-
316 SS Flat Pipe Mounting Bracket3 _ _ _-
316 SS Angle Pipe Mounting Bracket4 _ _ _-
316 SS Wall Mounting Bracket6 _ _ _-
TagNone_ 0 _ _-
Wired Stainless Steel Tag (Up to 4 Lines, 26 Char Ea.)_ 1 _ _-
Conduit Plugs and ConnectorsNone_ _ A0-
1/2" NPTM to 3/4" NPTF 316 SS Certified Conduit Adapter_ _ A2-
1/2" NPT 316 SS Certified Conduit Plug_ _ A6-
1/2" NPT Minifast® 4-Pin (Not for Explosion-Proof Use)_ _ A8-
Calibration Test Report, Certificate of ComplianceF1-
Certificate of OriginF5-
SIL 2/3 CertificationFE-j

  a   Available only on single input models.
  c   Not available with Honeywell DE protocol.
  e   Not available with digital output.
  f   Not available with Foundation Fieldbus.
  g   Available only on Foundation Fieldbus models.
  j   Available only with HART communications and write protection enabled.

More Information
SIL-Rated Yes

To build your complete part number, make a selection from each table section below. Your completed model and its price will appear in the Results section. If you don't see the options you need, call us.


                                  Please complete your model selections.
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