Honeywell STG735 Pressure Transmitter

Technical Specifications & Model Code Breakdown

In the landscape of industrial pressure measurement, the Honeywell STG735 Pressure Transmitter stands as a cornerstone of precision, reliability, and modular innovation within the SmartLine STG700 series. Engineered for critical process monitoring across oil and gas, chemical processing, power generation, and water treatment sectors, the STG735 delivers industry-leading performance with advanced piezoresistive sensor technology, ensuring accurate data capture even in harsh, dynamic operating environments. This technical guide explores the core specifications, design features, and comprehensive model code interpretation for the STG735-E1AC4AS-1-0-AHS-11S-A-10A0-00-0000 and related variants, equipping engineers and procurement teams with the insights needed for seamless integration and optimal performance.

Core Technical Specifications of the Honeywell STG735 Pressure Transmitter

The STG735 Pressure Transmitter is built to exceed industrial performance benchmarks, with a suite of technical parameters tailored for high-demand applications. Its measurement capabilities center on gauge pressure, with a standard Upper Range Limit (URL) of 0.35 MPa (50 psi) and a Lower Range Limit (LRL) of -0.1 MPa (-14.5 psi), supporting a minimum span of 0.0035 MPa (0.5 psi) for flexible calibration. A standout feature is its 100:1 turndown ratio, enabling precise measurement across a wide pressure range without sacrificing accuracy—critical for processes with fluctuating pressure profilesHoneywell.

Accuracy reaches ±0.05% of calibrated span, paired with exceptional long-term stability of 0.02% URL per year over a 10-year lifespan, minimizing maintenance requirements and ensuring consistent data integrity. The transmitter integrates on-board static pressure and temperature compensation, automatically correcting errors caused by environmental variations, with an operating temperature range of -40°C to +125°C (-40°F to +257°F) and 0-100% relative humidity toleranceHoneywell.

For process connectivity, the STG735 supports 1/2” NPT (female/male), DIN 19213, and G1/2-B male thread connections, with wetted components available in corrosion-resistant materials like 316/316L stainless steel, Hastelloy C, Monel, and Tantalum to suit aggressive mediaHoneywell. Electrical output options include 4-20 mA with HART 7.0 protocol, Honeywell DE, and FOUNDATION Fieldbus, ensuring compatibility with modern control systems such as Honeywell Experion PKSHoneywell. The unit features a rugged aluminum or 316 stainless steel CF8M enclosure with IP66/IP67 protection, dual 1/2” NPT or M20 electrical interfaces, and optional local LCD display for on-site configuration and diagnostics.

Model Code Interpretation: STG735-E1AC4AS-1-0-AHS-11S-A-10A0-00-0000

Honeywell’s model coding system for the STG735 Pressure Transmitter encodes every critical configuration detail, from materials to communication protocols. Below is a full breakdown of the STG735-E1AC4AS-1-0-AHS-11S-A-10A0-00-0000 model, alongside references to common variants like STG735-E1HC4AS-1-A-BHS-11C-B-01A7-FX-0000 and STG735-J1HS4AS-1-A-AHS-11S-A-10A0-F1-F5 to illustrate customization flexibility:

STG735: Base model identifier—SmartLine gauge pressure transmitter, high-performance variant with 0.35 MPa URL capability.

E: Wetted materials (process diaphragm/body)—316/316L stainless steel, standard for general industrial corrosive applications.

1: Process connection—1/2” NPT female thread, standard inline configuration.

A: Output signal—4-20 mA with HART 7.0 communication protocolHoneywell.

C: Enclosure material—aluminum with polyester paint coating, balancing durability and cost-effectiveness.

4: Electrical connection—dual 1/2” NPT ports for flexible wiring installation.

A: Local display—alphanumeric LCD display for real-time pressure readings and field configuration.

S: Approval standard—general industrial safety approvals, non-incendive for Class I, Division 2 hazardous locations.

1: Static pressue rating—standard 16 MPa (2320 psi) static pressure tolerance.

0: Special featues—no additional customizations (e.g., remote seals, capillary extensions).

AHS: Mounting & configuration—standard inline mounting, with external zero/span adjustment and SIL 2 safety integrity level compliance.

11S: Diagnostic & protection—comprehensive self-diagnostics, surge/lightning protection, and reverse polarity protection.

A: Power supply—24 VDC standard loop power.

10A0: Calibration & range—factory-calibrated to 0-0.35 MPa (0-50 psi), no custom range adjustment.

00: Optional accessories—no additional accessories (e.g., mounting brackets, valve manifolds).

0000: Reserved codes—no further custom specifications.

Application Versatility & Design Advantages

The Honeywell STG735 Pressure Transmitter excels in diverse scenarios due to its modular design and robust construction. Whether deployed in refinery pipeline monitoring, chemical reactor pressure control, or power plant boiler feed systems, models like STG735-E1AC4AS-1-0-AHS-11S-A-10A0-00-0000 and STG735-E1AC1AS-1-C-DHS-11C-B-01A7-FX-0000 deliver consistent performance. Its fully welded, hermetically sealed sensor module prevents media ingress, while the dual-seal enclosure meets ANSI/NFPA 70-202 and VISA 12.27 0 safety standards, ensuring operational safety in hazardous areas.

Fast response time (as low as 100 ms) supports real-time process control, while the modular electronics and sensor components simplify field maintenance and repair. Unlike one-size-fits-all transmitters, the STG735’s customizable model codes allow tailored solutions—for example, STG735-J1HS4AS-1-A-AHS-11S-A-10A0-F1-F5 features Hastelloy C wetted materials and specialized approvals for highly corrosive applications, demonstrating the series’ adaptability.

Conclusion

The Honeywell STG735 Pressure Transmitter sets the standard for industrial pressure measurement, merging precision, durability, and flexibility in a single, field-proven platform. With its advanced technical specifications, intuitive modular design, and detailed model coding system, variants like the STG735-E1AC4AS-1-0-AHS-11S-A-10A0-00-0000 provide engineers with a reliable solution for critical process monitoring and control. For projects demanding uncompromising accuracy, long-term stability, and seamless system integration, the STG735 remains the top choice across global process industries, reinforcing Honeywell’s legacy of innovation in smart instrumentation.