Honeywell STG775 Pressure Transmitter

Honeywell STG775 Pressure Transmitter

Honeywell STG775 Pressure Transmitter: High-Range Gauge Pressure Measurement for Industrial Heavy Duty

When process applications demand high-pressure measurement up to 3,000 psi, the Honeywell STG775 Pressure Transmitter delivers the accuracy, stability, and rugged reliability required for demanding industrial environments. As a high-range member of the SmartLine® ST700 series, the Honeywell STG775 Pressure Transmitter combines advanced piezoresistive sensor technology with on-chip static pressure and temperature compensation, ensuring precise measurement across a wide spectrum of operating conditions.

The Honeywell STG775 Pressure Transmitter is specifically engineered for applications requiring reliable high-pressure monitoring, including boiler systems, fuel feed lines, high-pressure chemical reactors, and hydrocarbon recovery processes in petrochemical refineries-18. Available in both in-line and dual-head configurations, the Honeywell STG775 Pressure Transmitter adapts to diverse installation requirements while maintaining exceptional measurement performance.

Core Performance Specifications of the Honeywell STG775 Pressure Transmitter

The Honeywell STG775 Pressure Transmitter delivers reference accuracy up to 0.065% of calibrated span, ensuring reliable data acquisition for critical process control loops-4. Some configurations of the Honeywell STG775 Pressure Transmitter achieve accuracy as high as 0.05% of calibrated span, meeting the most stringent industrial requirements-18. Long-term stability for the Honeywell STG775 Pressure Transmitter is rated at 0.02% of URL per year for up to five years, with extended options offering 0.020% of URL per year for ten years of continuous service-4.

STG775 Range and Turndown Capability

The Honeywell STG775 Pressure Transmitter has a maximum span of 3,000 psi (210 bar) with a lower range limit of -14.7 psi (-1.0 bar)-4. The minimum span is 30 psi (2.1 bar), supporting a turndown ratio of up to 100:1-4. This exceptional rangeability allows a single STG775 to cover multiple measurement points across a facility, reducing inventory requirements and simplifying maintenance logistics.

STG775 Response Time and Diagnostics

Response time for the Honeywell STG775 Pressure Transmitter is as fast as 100 milliseconds, supporting real-time control applications where rapid pressure changes must be captured and acted upon immediately-4. The STG775 is equipped with comprehensive on-board diagnostic capabilities that continuously monitor sensor health, electronics integrity, and communication status-4. The alphanumeric display of the STG775 provides intuitive readout of process variables, while external zero, span, and configuration capability allows field adjustments without removing housing covers-4.

Communications and Output Protocols for the STG775

The Honeywell STG775 Pressure Transmitter offers multiple communication options to integrate seamlessly with existing control systems. The STG775 supports standard 4-20 mA analog output with HART® protocol, Honeywell Digitally Enhanced (DE) protocol, and FOUNDATION™ Fieldbus-18. This flexibility ensures the STG775 can be deployed in both new installations and retrofit projects without requiring significant control system modifications.

Construction, Materials, and Process Connections of the STG775

The Honeywell STG775 Pressure Transmitter features a modular design, allowing field replacement of electronic modules without recalibrating the sensor-18. Wetted materials for the STG775 are available in 316L stainless steel or Hastelloy-C276, providing superior corrosion resistance for aggressive process media-4. The process connection of the STG775 is 1/2″ NPT female or male, with optional G 1/2 connection available. In-line configuration of the STG775 screws directly onto a 1/2″ male NPT nipple, enabling straightforward installation in existing piping systems-.

Environmental and Safety Compliance of the STG775

The Honeywell STG775 Pressure Transmitter features an integral dual seal design complying with ANSI/NFPA 70-202 and ANSI/ISA 12.27.0, ensuring safe operation even in the event of a primary seal failure-4. The STG775 is fully compliant with SIL 2/3 requirements as a standard feature, meeting IEC 61508 safety integrity level standards for use in safety instrumented systems-4. Hazardous area approvals for the STG775 include FM, CSA, ATEX, IECEx, NEPSI, and KOSHA, enabling deployment in explosive atmospheres worldwide. The STG775 also features polarity-insensitive electrical connections that simplify wiring and reduce installation errors-18.

Model Configuration and Ordering Information for the Honeywell STG775

The Honeywell STG775 Pressure Transmitter is available through a comprehensive model code system that allows precise specification of wetted materials, process connection type, output protocol, housing options, and approval ratings.

A typical ordering code for the STG775 is STG775-F1GC4A-1-A-AHS-11S-A-21A0-F1, where each alphanumeric segment defines specific configuration parameters-9. Another available configuration of the STG775 is STG775-F1GC4A-1-A-AHS-1, offering alternative selections for specific application requirements-4. Additional ordering options for the STG775 include:

STG77S-E1G000-1-A-AHS-11S-A-10A0-00-0000

STG77S-F1G000-1-C-AHS-11S-A-10A0-00-0000

STG77S-E1G000-1-0AHS-11S-A-00A0-00-0000-9

When ordering the STG775, users should specify the required pressure range, output signal, hazardous area classification, and process connection type to ensure proper configuration for the intended application.

Industry Applications of the STG775

The Honeywell STG775 Pressure Transmitter is optimized for high-pressure measurement applications requiring exceptional accuracy under varying static pressure and temperature conditions. Typical installations for the STG775 include:

Hydrocarbon recovery processes in petrochemical refineries-

Steam boiler systems requiring high-pressure monitoring-

High-pressure chemical reactor vessels

Fuel feed lines in power generation facilities

Tank level measurement with process temperatures up to 257°F (125°C)-18

The dual-head configuration of the STG775 is specifically suited for tank level applications where high process temperatures are encountered, while in-line versions of the STG775 provide reliable pressure measurement for high-pressure reaction vessels and fuel feed lines.

Why Choose the STG775 for Your High-Pressure Measurement Needs

The Honeywell STG775 Pressure Transmitter combines advanced sensor technology with practical field engineering features that reduce installation time and maintenance costs. The automatic temperature compensation built into the STG775 ensures measurement accuracy remains stable across ambient and process temperature fluctuations-4. The modular design of the STG775 allows users to replace the electronic module or redefine measurement range without purchasing a new transmitter.

For plants seeking to standardize on a single gauge pressure transmitter across multiple high-pressure measurement points, the 100:1 turndown of the STG775 provides the necessary flexibility to cover diverse measurement requirements with one model family-18. The STG775 is fully tested and compliant with Experion® Process Knowledge System (PKS), providing the highest level of compatibility assurance and integration capabilities for Honeywell distributed control systems-4.

Calibration and Maintenance of the STG775

Routine calibration of the Honeywell STG775 Pressure Transmitter is simplified by external zero and span adjustment capability, allowing field technicians to trim the device without opening the electronics housing. The long-term stability specification of the STG775 means annual calibration is sufficient for most applications, though users in SIL-rated loops should follow the validation schedule defined by their safety plan. The modular construction of the STG775 ensures that if an electronic failure occurs, the module can be replaced in the field and the device can return to service without a full recalibration procedure-19.

Technical Summary for the Honeywell STG775 Pressure Transmitter

Frequently Asked Questions about the Honeywell STG775 Pressure Transmitter

Q: What is the pressure range of the STG775?
A: The STG775 has a maximum span of 3,000 psi (210 bar) with a minimum span of 30 psi (2.1 bar), supporting a 100:1 turndown ratio.

Q: Can the STG775 be used for level measurement?
A: Yes, the dual-head configuration of the STG775 is suitable for tank level applications with process temperatures up to 257°F (125°C).

Q: What communication protocols does the STG775 support?
A: The STG775 supports 4-20 mA analog with HART protocol, Honeywell DE protocol, and FOUNDATION Fieldbus.

Q: Is the STG775 SIL certified?
A: Yes, the STG775 is SIL 2/3 compliant as a standard feature, meeting IEC 61508 requirements.

Q: What is the warranty period for the STG775?
A: The STG775 typically comes with a 12-month factory warranty, with extended warranty options available.

For engineers and procurement professionals seeking a high-range gauge pressure transmitter that combines field-proven reliability with advanced digital capabilities, the Honeywell STG775 Pressure Transmitter delivers the performance required for critical process applications. Contact your local Honeywell representative or authorized distributor for detailed pricing, availability, and application engineering support for the STG775.