Honeywell STG74S Pressure Transmitter

Honeywell STG74S Pressure Transmitter: Complete Technical Specifications & Datasheet for SmartLine STG700 Series

Product Overview

The Honeywell STG74S Pressure Transmitter represents a high-performance gauge pressure measurement solution from the renowned SmartLine STG700 series. Engineered for demanding industrial environments, the Honeywell STG74S delivers exceptional accuracy and long-term stability through advanced piezoresistive sensor technology combined with on-chip temperature compensation capabilities. Honeywell STG74S pressure transmitters are designed for monitoring, control and data acquisition applications, offering reliable performance across a wide range of process pressures and temperatures.

The Honeywell STG74S belongs to the SmartLine family of products, which are fully tested and compliant with Experion® PKS, providing the highest level of compatibility assurance and seamless integration capabilities. As a gauge in-line transmitter, the STG74S is screwed 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 STG74S utilizes a state-of-the-art piezoresistive sensor that integrates multiple sensing elements within a single platform. This sensor design combines process pressure measurement with static pressure and temperature sensing for comprehensive temperature compensation, enabling superior overall performance across the entire application range. Honeywell STG74S 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.

Technical Specifications

Performance Characteristics

The Honeywell STG74S delivers exceptional accuracy of ±0.065% of calibrated span, with optional enhanced accuracy available for applications requiring even tighter measurement tolerances. Long-term stability is rated at ±0.02% of URL per year for up to 10 years, ensuring consistent performance over extended operational periods.

Electrical Specifications

Honeywell STG74S transmitters support bidirectional communication and configuration between operator and transmitter via HART protocol, enabling remote monitoring, diagnostics, and parameter adjustments without interrupting process operations.

Environmental and Mechanical Specifications

Pressure Connection and Wetted Materials

Honeywell STG74S 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 STG74S features a modular alphanumeric LCD display with the following capabilities:

Display size: 2 lines, 6 digits PV (9.95H x 4.20W mm), 8 characters

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

Write protect indication: Standard

Square root output indication: Display calculated flow (square root) value

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.

Advanced Features

Diagnostic Capabilities

Honeywell STG74S 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. The self-diagnostic function continuously monitors sensor integrity, electronics performance, and communication status.

Safety and Compliance

The Honeywell STG74S 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. 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 STG74S 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

Configuration Options

Honeywell STG74S part numbers follow a comprehensive selection code structure. Example full part number: STG74S-E1G000-1-G-AHS-11S-A-10A0-F1-0000 where:

E – 316 SS/316L SS/Hastelloy C-276 wetted materials

1 – Silicone Oil 200 fill fluid

G – 1/2″ NPT female process connection

G – NEPSI explosion-proof, intrinsically safe & non-incendive approvals

A – Polyester powder-coated aluminum housing, 1/2″ NPT

H – 4-20 mA DC with HART protocol

S – Standard with internal zero/span/config buttons

Additional ordering options include over-pressure leak test certificates (1.5X MAWP), EN10204 Type 3.1 material traceability, and extended warranty up to 15 years.

Applications

The Honeywell STG74S 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

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

Food & Pharmaceutical Industries

Sanitary process pressure measurement

Sterilization vessel pressure control

CIP/SIP system monitoring

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 STG74S 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

Ordering and Availability

Honeywell STG74S 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.