Honeywell STG800 SmartLine Gauge Pressure Transmitter

Introduction

Part of the SmartLine® family of products, the STG800 and STG80L are high performance gauge pressure transmitters featuring piezoresistive sensor technology combining pressure sensing with on-chip temperature compensation capabilities, providing high accuracy, stability, and performance over a wide range of application pressures and temperatures. The SmartLine family is also fully tested and compliant with Experion® PKS, providing the highest level of compatibility assurance and integration capabilities. SmartLine easily meets the most demanding application needs for pressure measurement applications.

Best in Class Features

• Accuracies up to 0.0375% of span standard & 0.025% of span optional.
• Stability up to 0.015% of URL per year for 15 years.
• Automatic temperature compensation.
• Rangeability up to 100:1.
• Response times as fast as 80ms.
• Multiple local display capabilities.
• External zero, span, & configuration capability.
• Polarity insensitive electrical connections.
• Comprehensive on-board diagnostic capabilities.
• Integral Dual Seal design for highest safety based on ANSI/NFPA 70-202 and ANSI/ISA 12.27.1.
• Full compliance to SIL 2/3 requirements.
• Modular design characteristics.
• Available with an additional 15-year warranty.
• Plugged Impulse Line Detection Option.
• Supports NAMUR NE-107 Extended Diagnostics (FF).
• Dual/Triple Calibration Option (HART & Fieldbus Only).

Communications/Output Options

• 4-20mA
• Honeywell Digitally Enhanced (DE)
• HART® (version 7.0)
• FOUNDATION™ Fieldbus

All transmitters are available with the above listed communications protocols.

Span & Range Limits

Figure 1 - STG800 Gauge Pressure Transmitters

Figure 1 - STG800 Gauge Pressure Transmitters feature field-proven piezoresistive sensor technology

Two Honeywell STG800 SmartLine Gauge Pressure Transmitters are depicted. These devices are designed for industrial pressure measurement and feature a display screen and robust construction. The image highlights the core technology: field-proven piezoresistive sensor technology.

Description

The SmartLine family of gauge pressure, differential pressure, and absolute pressure transmitters is designed around a high performance piezo-resistive sensor. This one sensor integrates multiple sensors, linking process pressure measurement with on-board static pressure (DP Models) and temperature compensation measurements, resulting in the best total performance available. This level of performance allows the ST 800 to replace virtually any competitive transmitter available today.

Unique Indication/Display Options

The ST 800 modular design accommodates a standard alphanumeric LCD display or a unique advanced graphics LCD display with many unparalleled features.

Standard LCD Display Features

• Modular (may be added or removed in the field).
• Supports HART protocol variant.
• 0, 90, 180, & 270 degree position adjustments.
• Four configurable screens.
• Standard and custom measurement units available.
• Display calculated flow (square root) value in addition to analog output signal.
• 2 Lines 6 digits PV (9.95H x 4.20W mm) 8 Characters.
• Write protect Indication.
• Built-in Basic Device Configuration through Internal or External Buttons – Range/Engineering Unit/Loop Test /Loop Calibration/Zero /Span Setting.
• Multiple language capabilities (EN, RU).

Advanced Graphics LCD Display Features

• Modular (may be added or removed in the field).
• 0, 90, 180, & 270-degree position adjustments.
• Standard and custom measurement units available.
• Up to eight display screens with 3 formats are possible.
• Large PV with Bar Graph or PV with Trend Graph.
• Configurable screen rotation timing (1 to 30 sec).
• Display calculated flow (square root) value in addition to analog output signal.
• Unique "Health Watch" indication provides instant visibility of diagnostics.
• Multiple language capability (EN, DE, FR, IT, ES, RU, TR, CN, & JP).

Diagnostics

SmartLine transmitters all offer digitally accessible diagnostics which aid in providing advanced warning of possible failure events, minimizing unplanned shutdowns and providing lower overall operational costs.

Configuration Tools

Integral Three Button Configuration Option

Suitable for all electrical and environmental requirements, SmartLine offers the ability to configure the transmitter and display via three externally accessible buttons when either display option is selected. Zero/span capabilities are also optionally available via these buttons with or without selection of a display option.

Handheld Configuration

SmartLine transmitters feature two-way communication and configuration capability between the operator and the transmitter. All Honeywell transmitters are designed and tested for compliance with the offered communication protocols and are designed to operate with any standards-compliant handheld configuration device, such as the Honeywell Versatilis Configurator.

Personal Computer Configuration

On a personal computer or laptop, Honeywell Field Device Manager (FDM) Software and FDM Express can be used for managing HART & Fieldbus device configurations.

System Integration

• SmartLine communications protocols all meet the most current published standards for HART/DE/Fieldbus.
• Integration with Honeywell's Experion PKS offers the following unique advantages:
  • Transmitter messaging.
  • Maintenance mode indication.
  • Tamper reporting.
  • FDM Plant Area Views with Health summaries.
  • All ST 800 units are Experion tested to provide the highest level of compatibility assurance.

Modular Design

To help contain maintenance & inventory costs, all ST 800 transmitters are modular in design, supporting the user's ability to replace meter bodies, add indicators, or change electronic modules without affecting overall performance or approval body certifications. Each meter body is uniquely characterized to provide in-tolerance performance over a wide range of application variations in temperature and pressure. Due to the Honeywell advanced interface, electronic modules may be swapped with any electronics module without losing in-tolerance performance characteristics.

Modular Features

• Meter body replacement
• Exchange/replace electronics/comms modules*
• Add or remove integral indicators*
• Add or remove lightning protection (terminal connection)*

* Field replaceable in all electrical environments (including IS) except flameproof without violating agency approvals.

With no performance effects, Honeywell's unique modularity results in lower inventory needs and lower overall operating costs.

Plugged Impulse Line Detection

STG800 models are offered with a PILD option which provides indication of a plugged impulse line or process connection. When used in conjunction with an advanced display, a non-critical diagnostic indication appears on the integral display. For units without an integral display, an indication can be seen via the host or handheld device when HART Protocol is utilized.

Dual/Triple Calibration

STG800 models are optionally offered with multiple calibrations. In lieu of a standard factory calibration, units can be supplied with 1, 2, or 3 customer-specified calibrations. These calibrations are stored in the meter body and provide users with factory-calibrated performance at up to three different calibrated ranges. This increases application flexibility without requiring any costly recalibration or additional inventory.

Performance Specifications

Reference Accuracy (conformance to +/-3 Sigma)

Zero and span may be set anywhere within the listed (URL/LRL) range limits.

Accuracy at Specified Span and Temperature (Conformance to +/-3 Sigma)

Turn Down Effect: ±[A+B] if Span ≥ C; ±[A+B(Span)] if Span < C

Temp Effect: ±[D+E(URL/Span)]

Total Performance

Total Performance Calculation: = ±√(Accuracy)² + (Temperature Effect)²

Total Performance Examples (for comparison): Standard accuracy 5:1 Turndown, ±50°F (28°C) shift

• STG830 @ 10 psi: 0.059% of span
• STG83L @ 10 psi: 0.071% of span
• STG88L @ 1200 psi: 0.084% of span
• STG840 @ 100 psi: 0.059% of span
• STG84L @ 100 psi: 0.071% of span
• STG89L @ 2000 psi: 0.093% of span
• STG870 @ 600 psi: 0.063% of span
• STG87L @ 600 psi: 0.084% of span

Typical Calibration Frequency

Calibration verification is recommended every four (4) years.

Notes:

• Terminal Based Accuracy - Includes combined effects of linearity, hysteresis, and repeatability. Analog output adds 0.005% of span.
• For zero based spans and reference conditions of: 25°C (77°F) for LRV>= 0 psia, 10 to 55% RH, and 316 Stainless Steel barrier diaphragm.

Operating Conditions – All Models

¹ LCD Display operating temperature -20°C to +70°C. Storage temperature -30°C to 80°C.

² Silicone 704 minimum temperature rating is 0°C (32°F). CTFE minimum temperature rating is -40°C (-40°F). NEOBEE M-20 minimum temperature rating is -15°C (5°F). NEOBEE® is a registered trademark of Stepan Company.

³ Short term equals 2 hours at 70°C (158°F).

⁴ Consult factory for MAWP of ST 800 transmitters with CRN approval.

Figure 2 - Supply voltage and loop resistance chart & calculations

Figure 2 - Supply voltage and loop resistance chart & calculations

This figure illustrates the relationship between operating voltage (VDC) and loop resistance (ohms) for HART and DE communication protocols. It includes formulas for calculating maximum loop resistance (RLmax) for both protocols, based on supply voltage. A minimum of 250 ohms loop resistance is required to support a field communicator.

Performance Under Rated Conditions – All Models

Materials Specifications

(See model selection guide for availability/restrictions with various models)

¹ Vent/Drains are sealed with Teflon®

² Hastelloy® C-276 or UNS N10276.

³ Monel® 400 or UNS N04400.

⁴ Supplied as 316 SS or as Grade CF8M, the casting equivalent of 316 SS.

⁵ Carbon Steel heads are zinc-plated and not recommended for water service due to hydrogen migration. For that service, use 316 stainless steel wetted Process Heads.

⁶ Hastelloy® C-276 or UNS N10276. Supplied as indicated or as Grade CW12MW, the casting equivalent of Hastelloy® C-276.

⁷ Monel® 400 or UNS N04400. Supplied as indicated or as Grade M30C, the casting equivalent of Monel® 400.

⁸ 9/16 Aminco.

Communications Protocol & Diagnostics

HART Protocol

Version: HART 7

Foundation Fieldbus (FF)

Available Function Blocks

* AI block may have two (2) additional instantiations.

All available function blocks adhere to FOUNDATION Fieldbus standards. PID blocks support ideal & robust PID algorithms with full implementation of Auto-tuning.

Link Active Scheduler

Transmitters can perform as a backup Link Active Scheduler and take over when the host is disconnected. Acting as a LAS, the device ensures scheduled data transfers typically used for the regular, cyclic transfer of control loop data between devices on the Fieldbus.

Number of Devices/Segment: Entity IS model: 6 devices/segment

Schedule Entries: 18 maximum schedule entries

Number of VCR's: 24 max

Compliance Testing: Tested according to ITK 6.0.1

Software Download: Utilizes Class-3 of the Common Software Download procedure as per FF-883 which allows the field devices of any manufacturer to receive software upgrades from any host.

Honeywell Digitally Enhanced (DE)

DE is a Honeywell proprietary protocol which provides digital communications between Honeywell DE enabled field devices and Hosts.

Standard Diagnostics

ST 800 top-level diagnostics are reported as either critical or non-critical and are readable via the DD/DTM/FDI tools or integral display. All critical diagnostics will appear on the Advanced and Standard integral displays, and some non-critical diagnostics will also appear on the Advanced integral display. Some of the diagnostics are listed below.

Critical Diagnostics

• Electronics Module Fault.
• Meter body Memory Corruption.
• Config Data Corruption.
• Electronics Module Diagnostics Failure.
• Meter body Critical Failure.
• Sensor Communication Timeout.

Non-Critical Diagnostics

• Electronics Module Fault.
• Display Failure.
• Electronics Module Comm Failure.
• Meter body Excess Correct.
• Sensor Over Temperature.
• Fixed Current Mode.
• PV Out of Range.
• No DAC Compensation.
• Tamper Attempt Alarm.

Refer to the product user manual for comprehensive list of diagnostics and details.

Other Certification Options

Materials

• NACE MRO175, MRO103, ISO15156

Hazardous Area Certifications

Notes & Approval Certifications

Notes

1. Operating Parameters:
   Voltage = 11 to 42 VDC
   = 9 to 32 V (FF)
   Current = 4-20 mA Normal
   = 30 mA (FF)
2. Intrinsically Safe Entity Parameters

a. Analog/DE/HART Entity Values:

Note: Transmitter with Terminal Block revision E or later. The revision is on the label that is on the module. There will be two lines of text on the label: First is the Module Part #: 50049839-001 or 50049839-002. Second line has the supplier information, along with the REVISION: XXXXXXX-EXXXX, THE "X" is production related, THE POSITION of the "E" IS THE REVISION.

b. Foundation Fieldbus Entity Values

FISCO Field Device

Note: Transmitter with Terminal Block revision F or later. The revision is on the label that is on the module. There will be two lines of text on the label: First is the Module Part #: 50049839-003 or 50049839-004. Second line has the supplier information, along with the REVISION: XXXXXXX-EXXXX, THE "X" is production related, THE POSITION of the "E" IS THE REVISION.

Approval Certifications

This certificate defines the certifications covered for the ST 800 Pressure Transmitter family of products, including the SMV 800 Smart Multivariable Transmitter. It represents the compilation of the five certificates Honeywell currently has covering the certification of these products into marine applications.

For ST 800 Smart Pressure Transmitter and SMV800 Smart Multivarible Transmitter

Marine Certificates

• American Bureau of Shipping (ABS) - 2009 Steel Vessel Rules 1-1-4/3.7, 4-6-2/5.15, 4-8-3/13 & 13.5, 4-8-4/27.5.1, 4-9-7/13. Certificate number: 04-HS417416-PDA
• Bureau Veritas (BV) - Product Code: 389:1H. Certificate number: 12660/B0 BV
• Det Norske Veritas (DNV) - Location Classes: Temperature D, Humidity B, Vibration A, EMC B, Enclosure C. For salt spray exposure; enclosure of 316 SST or 2-part epoxy protection with 316 SST bolts to be applied. Certificate number: A-11476
• Korean Register of Shipping (KR) - Certificate number: LOX17743-AE001
• Lloyd's Register (LR) - Certificate number: 02/60001(E1) & (E2)

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.

MEASUREMENT INSTRUMENTS DIRECTIVE (MID) 2004/22/EC

Certificate Issued by NMI Certin B.V.

Mechanical Class: M3

Electromagnetic Environment: E3

Ambient Temperature Range: -25 °C to + 55 °C

Dimensional Drawings

Figure 3 - Typical mounting configuration of dual head and inline designs

Figure 3 - Typical mounting configuration of dual head and inline designs for reference

Diagrams illustrating various mounting configurations for the STG800 transmitters, showing both dual head and inline designs attached to piping systems.

Figure 4 - Typical mounting dimensions of STG840 & STG870

Figure 4 - Typical mounting dimensions of STG840 & STG870 for reference

Dimensional drawings for the STG840 and STG870 models in a dual head design. The drawings provide detailed measurements in millimeters and inches for various components and orientations, including conduit connections, vent/drain ports, and overall dimensions with and without optional displays.

Figure 5 - Typical mounting dimensions of STG84L, STG87L, STG88L, & STG89L

Figure 5 - Typical mounting dimensions of STG84L, STG87L, STG88L, & STG89L for reference

Dimensional drawings for the STG84L, STG87L, STG88L, and STG89L models in an inline design. The drawings provide detailed measurements in millimeters and inches for various components and orientations, including conduit connections, pressure connections, vent/drain ports, and overall dimensions with and without optional displays.

Model Selection Guide

Model Selection Guides are subject to change and are inserted into the specifications as guidance only.

Model STG800 Gauge Pressure Transmitters

Model Selection Guide: 34-ST-16-83 | Issue: 34

Instructions: Make selections from all Tables using column below the proper arrow. Asterisk indicates availability. Letter (a) refers to restrictions highlighted in the restrictions table. Tables delimited with dashes. List Price: Price equals the sum of prices for all selections made.

Key Number Table

TABLE I: METER BODY SELECTIONS

¹ Except Carbon Steel Heads shall use 316SS Vent/Drain & Plugs and or 1/2" adapters

¹ᵃ STG830,840,870 supplied via 1/2" flange adapter same material as process head except carbon steel shall use 316 SS

¹ᵇ Reference head available with Dual Head Gage models only. In-Line Gage models are supplied with Process Head only.

¹ᶜ When selected for In-Line Gage models the Process Head / Bonnet is supplied in Dual Certified SS316/316L

¹ᵈ 9/16" Aminco

TABLE II: METER BODY & CONNECTION ORIENTATION

TABLE III: AGENCY APPROVALS

TABLE IV: TRANSMITTER ELECTRONICS SELECTIONS

TABLE V: CONFIGURATION SELECTIONS

² Left side/Right side as viewed from the customer connection perspective

³ NAMUR Output Limits are configurable by customer

TABLE VI: CALIBRATION & ACCURACY SELECTIONS

TABLE VII: ACCESSORY SELECTIONS

TABLE VIII: OTHER Certifications & Options: (String in sequence comma delimited (XX, XX, XX,....)

¹The PM option is available on all Smartline Pressure Transmitter process wetted parts such as process heads, flanges, bushings and vent plugs except plated carbon steel process heads and flanges. PM option information is also available on diaphragms except Gold plated and STG and STA in-line construction pressure transmitters.

TABLE IX: Factory Identification

Field Installable Accessory Kits

• Integrally Mounted Advanced Indicator Kit (compatible with all Electronic Modules)
• Standard Display Module
• Terminal Strip w/o Lightning Protection for HART or DE Modules
• Terminal Strip w/ Lightning Protection Kit for HART or DE Modules
• Terminal Strip w/o Lightning Protection FFB Module
• Terminal Strip w/ Lightning Protection Kit for FFB Module
• HART Electronics Module
• HART Electronics Module w/ connection for external configuration buttons
• DE Electronics Module
• DE Electronics Module w/ connection for external configuration buttons
• FFB Electronics Module Kit
• FFB Electronics Module w/ connection for external configuration buttons

Note P - For part number pricing please refer to WEB Channel

Product Manuals

• ST 800 SmartLine Transmitter User Manual - English
• ST 800 SmartLine Transmitter HART/DE Communications Manual - English
• ST 800 SmartLine Transmitter Safety Manual - English
• ST 800 SmartLine Transmitter Foundation Fieldbus Manual - English
• ST 800 SmartLine Transmitter Function Block Manual - English

All product documentation is available at www.honeywellprocess.com.

Sales and Service

For application assistance, current specifications, ordering, pricing, and name of the nearest Authorized Distributor, contact one of the offices below.

ASIA PACIFIC

Honeywell Process Solutions,
Phone: + 800 12026455 or +44 (0) 1202645583
(TAC) hfs-tac-support@honeywell.com

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: (86-21) 5257-4568
Fax: (86-21) 6237-2826

Singapore

Honeywell Pte Ltd.
Phone: +(65) 6580 3278
Fax: +(65) 6445-3033

South Korea

Honeywell Korea Co Ltd
Phone: +(822) 799 6114
Fax: +(822) 792 9015

EMEA

Honeywell Process Solutions,
Phone: + 800 12026455 or +44 (0) 1202645583
Email: (Sales) FP-Sales-Apps@Honeywell.com
or (TAC)
hfs-tac-support@honeywell.com

Web
Knowledge Base search engine http://bit.ly/2N5Vldi

AMERICAS

Honeywell Process Solutions,
Phone: (TAC) (800) 423-9883 or (215) 641-3610
(Sales) 1-800-343-0228
Email: (Sales) FP-Sales-Apps@Honeywell.com
or (TAC)
hfs-tac-support@honeywell.com

Web
Knowledge Base search engine http://bit.ly/2N5Vldi

Specifications are subject to change without notice.

For more information

To learn more about SmartLine Transmitters, visit www.process.honeywell.com
Or contact your Honeywell Account Manager

Process Solutions

Honeywell
1250 W Sam Houston Pkwy S
Houston, TX 77042

Honeywell Control Systems Ltd

Honeywell House, Skimped Hill Lane
Bracknell, England, RG12 1EB

Shanghai City Centre, 100 Jungi Road

Shanghai, China 20061

www.process.honeywell.com

34-ST-03-83
September 2025
©2025 Honeywell International Inc.