Revision 4.0 STT850 Series HART/DE Option User’s Manual Page 3
1.2.2 Functional Characteristics
The Transmitter measures process Temperature and outputs a signal proportional to the measured
process variable (PV). Available output communication protocols include analog 4 to 20 mA,
Honeywell Digitally Enhanced (DE) protocol, HART, and FOUNDATION Fieldbus.
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.
1.3 STT850 SmartLine Transmitter NamePlate
The Transmitter nameplate mounted on the top of the Electronics Housing (see Figure 2) lists the
model number, physical configuration, electronics options, accessories, certifications, and
manufacturing specialties. Figure 3 is an example of a typical STT850 temperature Name plate. 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:
For a complete selection breakdown, refer to the appropriate Specification and Model Selection
Guide provided as a separate document.
1.4 Safety Certification Information
An “approvals” name plate is located on the bottom of the Electronics Assembly; see Figure 1 for
exact location. The approvals name plate contains information and service marks that disclose the
Transmitter compliance information. Refer to Appendix C of the STT850 SmartLine Transmitters
User’s Manual, document number 34-ST-25-35 for details.
1.5 Transmitter Adjustments
Span adjustments are possible in new generation STT850 SmartLine Temperature Transmitters by
using the optional three-button assembly located at the top of the Electronic Housing (see Figure 2).
However, certain capabilities are limited in the following configurations:
Without a display –Span setting only for HART and DE devices.
With a display – Complete Transmitter configuration is possible for HART & DE devices.
Key I II III IV V VI VII VIII IX
STT850 - _ - _ - _ - _ _ _ - _ _ _ - _ - _ _ _ _ - _ _, _ _, _ _ - X X X X
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