Honeywell STG73S Pressure Transmitter

Honeywell STG73S Pressure Transmitter

Honeywell STG73S Pressure Transmitter: Precision Gauge Pressure Measurement for Low-Range Industrial Applications

When process applications require precise low-range gauge pressure monitoring, the Honeywell STG73S Pressure Transmitter delivers the accuracy, stability, and reliability demanded by modern industrial environments. As a specialized low-range member of the SmartLine® ST700 series, the Honeywell STG73S Pressure Transmitter combines advanced piezoresistive sensor technology with on-chip static pressure and temperature compensation, ensuring exceptional measurement performance across a wide range of operating conditions.

The Honeywell STG73S Pressure Transmitter is specifically engineered for applications requiring precise low-pressure measurement, with a maximum span of 50 psi (3.5 bar). Typical installations for the Honeywell STG73S Pressure Transmitter include low-range pressure monitoring in oil and gas operations, chemical processing plants, water treatment facilities, and HVAC systems where accurate gauge pressure data is essential for process control and safety. Available in both in-line and dual-head configurations, the STG73S adapts to diverse installation requirements while maintaining high measurement fidelity.-1-11

Core Technical Specifications of the STG73S

The Honeywell STG73S Pressure Transmitter delivers reference accuracy up to ±0.065% of calibrated span, ensuring reliable data acquisition for critical process control loops where low-pressure measurements must be precise.-11 Long-term stability for the Honeywell STG73S Pressure Transmitter is rated at ±0.020% of URL per year for up to ten years, significantly extending calibration intervals and reducing total cost of ownership.-7-11

STG73S Range and Turndown Capability

The Honeywell STG73S Pressure Transmitter has a maximum span of 50 psi (3.5 bar) with a lower range limit (LRL) of -14.7 psi (-1.0 bar). The minimum span is 0.5 psi (0.035 bar), supporting a turndown ratio of up to 100:1.-1 This rangeability allows a single STG73S to accommodate diverse measurement requirements, reducing inventory complexity and simplifying maintenance logistics.

STG73S Response Time and Diagnostics

Response time for the Honeywell STG73S Pressure Transmitter is as fast as 100 milliseconds, supporting real-time control applications where low-pressure changes must be captured and acted upon immediately.-7 Comprehensive on-board diagnostic capabilities continuously monitor sensor health, electronics integrity, and communication status, providing advanced warning of potential failure events and minimizing unplanned downtime.-7 The alphanumeric display of the STG73S provides intuitive readout of process variables, while external zero, span, and configuration capability allows field adjustments without removing housing covers.-6

STG73S Operating Environment

Operating temperature range for the Honeywell STG73S Pressure Transmitter spans -40°C to +85°C (-40°F to +185°F), accommodating deployment in diverse climatic conditions.-11 Power supply voltage at the terminals is 10.8 to 42.4 VDC, with supply voltage effect of 0.005% span per volt.-2 Load resistance ranges from 0 to 1,440 ohms, ensuring compatibility with various control system configurations.-2

Communications and Output Protocols for the STG73S

The Honeywell STG73S Pressure Transmitter offers multiple communication options to integrate seamlessly with existing control systems. The STG73S supports standard 4-20 mA analog output with HART® protocol (version 7.0), Honeywell Digitally Enhanced (DE) protocol, and FOUNDATION™ Fieldbus.-7 This flexibility ensures the STG73S can be deployed in both new installations and retrofit projects without requiring significant control system modifications.

Construction, Materials, and Process Connections of the STG73S

The Honeywell STG73S Pressure Transmitter features a modular design, allowing field replacement of electronic modules and meter bodies without affecting overall performance.-13 This unique modularity results in lower inventory needs and reduced operating costs. Wetted materials for the STG73S are available in 316L stainless steel, Hastelloy-C276, Monel 400, and other corrosion-resistant alloys, providing compatibility with aggressive process media across chemical and petrochemical applications.-2 The process connection of the STG73S is 1/2″ NPT female or male, with optional G 1/2 connection available. In-line configuration screws directly onto a 1/2″ male NPT nipple, enabling straightforward installation in existing piping systems.-1

Environmental and Safety Compliance of the STG73S

The Honeywell STG73S Pressure Transmitter features an integral dual seal design based on ANSI/NFPA 70-202 and ANSI/ISA 12.27.0 standards, ensuring safe operation even in the event of a primary seal failure.-7 The STG73S 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 (SIS).-7-13 Hazardous area approvals for the STG73S include FM, CSA, ATEX, IECEx, NEPSI, and KOSHA, enabling deployment in explosive atmospheres worldwide. Polarity-insensitive electrical connections simplify wiring and reduce installation errors.-6

Model Configuration and Ordering Information for the STG73S

The Honeywell STG73S 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.

Available configurations of the STG73S include:

STG73S-E1G000-1-G-AHS-11S-A-00A0-00-0000

STG73S-E1G000-1-0-DHS-11S-A-10A0-0000

STG73S-E1G000-1-G-GHS-11C-A-20A0-00-0000

STG73S-J1G000-1-C-BHT-13C-B-30A0-TP,PM,FX,FE,F7,F1-0000

STG73S-E1G000-1-0-AH0-11S-A-00A0

STG73S-E1G000-1-A-AHS-11S-A-10A0

STG73S-E1G000-1-G-AHS-11S-A-00A0-00-0000-13-7-3-18

When ordering the STG73S, 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 STG73S

The Honeywell STG73S Pressure Transmitter is optimized for low-range gauge pressure measurement across diverse industrial sectors. Typical installations for the STG73S include:

Low-pressure monitoring in oil and gas production facilities

Process pressure measurement in chemical processing plants

Tank level monitoring for water treatment applications

HVAC system pressure control

Pressure monitoring for reaction vessels in chemical industry applications-19

The dual-head configuration of the STG73S is specifically suited for level applications with process temperatures up to 257°F (125°C), while in-line versions of the STG73S provide reliable pressure measurement for boilers, fuel feeds, and low-pressure reaction vessels.-19-1

SmartLine Family Integration and Compliance of the STG73S

The Honeywell STG73S Pressure Transmitter 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.-7-6 The STG73S can replace any existing 4-20 mA transmitter currently on the market, making it an ideal choice for control system upgrades or plant expansions. For digital plant environments, the HART 7.0 and Foundation Fieldbus options of the STG73S enable access to additional diagnostic data and multivariable information beyond the primary pressure reading.

Calibration and Maintenance of the STG73S

Routine calibration of the Honeywell STG73S Pressure Transmitter is simplified by external zero and span adjustment capability, allowing field technicians to trim the device without opening the electronics housing.-13 The long-term stability specification of the STG73S (0.020% of URL per year for ten years) means calibration frequency can be significantly reduced, lowering maintenance costs and minimizing process interruptions. The modular construction of the STG73S 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.-13

Technical Summary for the Honeywell STG73S Pressure Transmitter

Frequently Asked Questions about the Honeywell STG73S Pressure Transmitter

Q: What is the pressure range of the STG73S?
A: The STG73S has a maximum span of 50 psi (3.5 bar) with a minimum span of 0.5 psi (0.035 bar), supporting a 100:1 turndown ratio.

Q: What are the accuracy specifications for the STG73S?
A: The STG73S delivers ±0.065% reference accuracy of calibrated span, with long-term stability of ±0.020% of URL per year for ten years.

Q: Can the STG73S be used for level measurement?
A: Yes, the dual-head configuration of the STG73S is suitable for tank level applications with process temperatures up to 257°F (125°C).

Q: What communication protocols does the STG73S support?
A: The STG73S supports 4-20 mA analog with HART protocol (version 7.0), Honeywell DE protocol, and FOUNDATION Fieldbus.

Q: Is the STG73S SIL certified?
A: Yes, the STG73S is SIL 2/3 compliant as a standard feature, meeting IEC 61508 requirements.

Q: What is the warranty period for the STG73S?
A: The STG73S typically comes with a 12-month factory warranty, with extended 4-year warranty options available.-7

For engineers and procurement professionals seeking a low-range gauge pressure transmitter that combines precision measurement with field-proven reliability and advanced digital capabilities, the Honeywell STG73S 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 STG73S.