Honeywell STG77S Pressure Transmitter

Honeywell STG77S Pressure Transmitter

Honeywell STG77S Pressure Transmitter: Complete Technical Data Sheet for SmartLine STG700 Series

Honeywell STG77S Pressure Transmitter is a high-performance gauge pressure measurement instrument from the renowned SmartLine STG700 family. Engineered for demanding industrial environments, the Honeywell STG77S delivers exceptional measurement accuracy and long-term stability through advanced piezoresistive sensor technology with on-chip temperature compensation. Honeywell STG77S pressure transmitters are designed for monitoring, control and data acquisition across a wide range of process pressures and temperatures.

The Honeywell STG77S belongs to the SmartLine product family, fully tested and compliant with Experion® PKS, providing the highest level of compatibility assurance and seamless integration capabilities for process automation systems-17. As a gauge in-line transmitter, the STG77S screws directly onto a 1/2″ male NPT nipple and can be installed in hazardous environments for accurate, repeatable pressure measurement.

Core Sensor Technology

The Honeywell STG77S utilizes a state-of-the-art piezoresistive sensing platform that integrates multiple sensing elements within a single chip. This sensor architecture combines process pressure measurement with on-board static pressure and temperature sensing, enabling comprehensive temperature compensation that delivers superior overall performance across the full application range-5. Honeywell STG77S transmitters feature ion-implanted silicon technology that automatically corrects errors caused by process temperature variations and static pressure changes, resulting in industry-leading measurement precision.

The STG77S pressure transmitter incorporates a “three-in-one” piezoresistive sensor that integrates differential pressure sensing, temperature sensing, and static pressure measurement capabilities, producing a fully compensated output signal that maintains accuracy across varying operating conditions.

Technical Specifications

Performance Characteristics

The Honeywell STG77S delivers exceptional accuracy of ±0.065% of calibrated span, with optional enhanced accuracy of ±0.04% available for applications requiring tighter measurement tolerances-5-23. Long-term stability is rated at ±0.02% of URL per year for up to 10 years, ensuring consistent performance over extended operational periods. The STG77S offers a turndown ratio of 100:1, providing exceptional application flexibility and reducing the need for multiple transmitter ranges-15.

Electrical Specifications

Honeywell STG77S transmitters support bidirectional communication and configuration between operator and transmitter via HART protocol, enabling remote monitoring, diagnostics, and parameter adjustments without interrupting process operations-13.

Environmental and Mechanical Specifications

The Honeywell STG77S is designed to withstand harsh industrial environments, with an IP66/IP67 enclosure rating ensuring reliable operation in dust-laden and wet conditions.

Pressure Connection and Wetted Materials

Honeywell STG77S configurations offer multiple material options for process compatibility:

Standard head material: 316 Stainless Steel with 316L SS diaphragm

Optional materials: Hastelloy C-276 for corrosive process media

O-ring gasket: PTFE (Teflon) standard; Viton optional

Bolts/Nuts: Carbon steel (galvanized) or 316 SS per NACE requirements

Display and User Interface

The Honeywell STG77S features a modular alphanumeric LCD display with the following capabilities:

Display size: 2 lines, 16 characters per line (4.13mm H x 1.83mm W)

Position adjustments: 0°, 90°, 180°, 270° rotatable

Configurable screens: Four programmable display screens

Measurement units: Pa, kPa, MPa, kg/cm², torr, atm, inH₂O, mH₂O, bar, mbar, inHg, ftH₂O, mmH₂O, mmHg, psi

Square root output indication: Calculated flow (square root) value display

Languages: English, Russian

The display module can be added or removed in the field, and includes internal configuration buttons for basic device setup including range/engineering unit selection, loop test, loop calibration, and zero/span setting-13. For models with the LCD display configured, three magnetic buttons enable full operational configuration of all transmitter parameters-13.

Advanced Features

Diagnostic Capabilities

Honeywell STG77S transmitters offer comprehensive on-board diagnostic capabilities that provide digital access to device health monitoring. These diagnostics deliver advanced warning of possible failure events, minimizing unplanned shutdowns and reducing overall operational costs-13. The self-diagnostic function continuously monitors sensor integrity, electronics performance, and communication status.

Safety and Compliance

The Honeywell STG77S incorporates an integral dual seal design based on ANSI/NFPA 70-202 and ANSI/ISA 12.27.0 standards, ensuring maximum safety in process applications-23. Key certifications include:

SIL 2/3 compliance (standard configuration)

ATEX explosion-proof and intrinsically safe (optional)

IECEx certification

CSA certification

CE marking

NEPSI certification for Chinese hazardous area requirements

Modular Design

Honeywell STG77S pressure transmitters feature a fully modular construction that enables easy field maintenance and configuration. Key modular components include:

Replaceable sensor module – removable without de-pressurizing the process

Replaceable electronics module – field-swappable without recalibration

Optional display module – add or remove in the field

Interchangeable housing options – explosion-proof and weatherproof variants

Complete Model Number Configuration Example

The Honeywell STG77S part number follows a comprehensive selection code structure. Example full part numbers:

STG77S-E1G000-1-A-AHS-11S-A-00A0-00-0000 – 0-21 MPa range, 316 SS wetted materials, standard accuracy, HART protocol, standard display with internal buttons-11

STG77S-E2G000-1-A-AHS-11 – 0-3,000 psi range, CTFE fill fluid, explosion-proof approval, 4-20 mA with HART output-5

STG77S-E1G000-1-A-AHS-11C-B-10A7 – Gauge in-line transmitter with 316 SS/316L SS wetted materials, silicone oil fill fluid, HART protocol, M20 conduit plug-3

Model Number Code Breakdown

Applications

The Honeywell STG77S is ideal for a broad range of industrial pressure measurement applications:

Oil & Gas Industry

High-pressure measurement in boilers and fuel feeds

Hydrocarbon recovery processes

Pipeline pressure monitoring

Wellhead pressure measurement

Chemical & Petrochemical Facilities

High-pressure reaction vessel monitoring (up to 3,000 psi)

Process control in distillation columns

Reactor pressure measurement

Chemical feed systems

Power Generation

Boiler pressure monitoring

Steam system pressure measurement

Turbine inlet pressure control

Fuel gas pressure regulation

Water & Wastewater Treatment

Pump discharge pressure monitoring

Filter differential pressure measurement

Distribution system pressure control

Tank Level Measurement

High-temperature tank level applications (up to 125°C)

Storage vessel hydrostatic level measurement

Process vessel level control

Installation Considerations

The Honeywell STG77S in-line design enables direct mounting onto a 1/2″ male NPT nipple, facilitating simple and secure installation. For optimal performance:

Mount the transmitter in a location with minimal vibration

Ensure ambient temperature remains within specified limits

Use appropriate conduit seals for hazardous area installations

Allow sufficient access for external zero/span adjustment buttons

Consider heat tracing or insulation for process temperatures exceeding ambient limits

The STG77S can be installed in hazardous environments and is suitable for use with various mounting bracket options including angle brackets made of carbon steel.

Configuration Tools

Honeywell STG77S transmitters can be configured using multiple methods:

Integrated three-button configuration module – usable in all electrical and environmental conditions, enabling configuration of all transmitter parameters when the LCD display is fitted-13

MCT202 Multi-Protocol Communicator – field configurable for DE and HART transmitters, usable in intrinsically safe environments-13

SCT3000 Configuration Toolkit – provides a simple method for configuring DE protocol transmitters using a PC as the configuration HMI-13

Field Device Manager (FDM) – manages HART and Fieldbus device configurations

Ordering and Availability

Honeywell STG77S pressure transmitters are available through authorized Honeywell distributors worldwide. Typical lead times range from 6–8 weeks for standard configurations. Custom configurations with specialized materials, extended warranties, or enhanced accuracy options may require additional lead time.

For pricing, availability, and configuration assistance, contact your local Honeywell representative or authorized distributor. Stock configurations may be available for immediate shipment.