Honeywell STT850, STT750 User Manual

STT850 and STT750 SmartLine

Temperature Transmitter

HART® Communications Options

Safety Manual

34-TT-25-05

Revision 6

November 2020

Honeywell Process Solutions

Copyrights, Notices and Trademarks

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© Copyright 2020 by Honeywell, Inc. Revision 6, November 2020

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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

2101 City West Blvd

Houston, TX 77042

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HART Option Safety Manual

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About This Document

Release Information

STT850 and STT750 SmartLine Transmitter HART® Communications Options Safety Manual,

# 34-TT-25-05.

Revision	Date of Change	Details of Change
1	March 2014	1st Release (STT850 only)
2	August 2015	STT750 Temperature Transmitter added.
3	March 2016	Digital Output for STT850
4	September 2017	Failure rates info added
5	January 2020	Web links updated
6	November 2020	Note for HART Communication Module Firmware added

References

The following list identifies publications that may contain information relevant to the information in this document.

STT850

•STT850 SmartLine Temperature Transmitter Specifications, 34-TT-03-14

•STT850 SmartLine Temperature Transmitter Quick Start Installation Guide,

#34-TT-25-04

•STT 850 SmartLine Temperature Transmitter User Manual, Document # 34-TT-25-03

•STT850 SmartLine Temperature Transmitter HART/DE Option User’s Manual,

#34-TT-25-06

STT750

•STT750 SmartLine Temperature Transmitter Specification, 34-TT-03-16

•STT750 SmartLine Temperature Transmitter Quick Start Installation Guide,

#34-TT-25-14

•STT 750 SmartLine Temperature Transmitter User Manual, Document # 34-TT-25-13

•STT750 SmartLine Temperature Transmitter HART Option User’s Manual,

#34-TT-25-16

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.

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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	www.honeywellprocess.com/temperature-transmitters/
Training Classes	http://www.honeywellprocess.com/en-US/training

Telephone and Email Contacts

	Area	Organization	Phone Number
	United States and	Honeywell Inc.	1-800-343-0228	Customer Service
	Canada		1-800-423-9883	Global Technical Support
	Global Email Support	Honeywell Process Solutions	[e-mail]

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Terms and Abbreviations

1oo1	One out of one
Basic Safety	The equipment must be designed and manufactured such that it protects
	against risk of damage to persons by electrical shock and other hazards
	and against resulting fire and explosion. The protection must be effective
	under all conditions of the nominal operation and under single fault
	condition
DU	Dangerous Undetected failures
FMEDA	Failure Modes, Effects and Diagnostic Analysis
Functional	The ability of a system to carry out the actions necessary to achieve or
Safety	to maintain a defined safe state for the equipment / machinery / plant /
	apparatus under control of the system
GTS	Global Technical Support Center
HART®	Highway Addressable Remote Transducer
HFT	Hardware Fault Tolerance
Low demand	Mode, where the frequency of demands for operation made on a safety-
mode	related system is no greater than one per year and no greater than twice
	the proof test frequency.
PFDAVG	Average Probability of Failure on Demand
Safety	Freedom from unacceptable risk of harm
Safety	The investigation to arrive at a judgment - based on evidence - of the
Assessment	safety achieved by safety-related systems. Further definitions of terms
	used for safety techniques and measures and the description of safety
	related systems are given in IEC 61508-4.
SFF	Safe Failure Fraction, the fraction of the overall failure rate of a device
	that results in either a safe fault or a diagnosed unsafe fault.
SIF	Safety Instrumented Function, a set of equipment intended to reduce the
	risk due to a specific hazard (a safety loop).
SIL	Safety Integrity Level, discrete level (one out of a possible four) for
	specifying the safety integrity requirements of the safety functions to be
	allocated to the E/E/PE safety-related systems where Safety Integrity
	Level 4 has the highest level of safety integrity and Safety Integrity Level
	1 has the lowest.
SIS	Safety Instrumented System – Implementation of one or more Safety
	Instrumented Functions. A SIS is composed of any combination of
	sensor(s), logic solver(s), and final element(s).

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