Honeywell STG700 Modules: STG740-E1GC4A-1-A-AHB-11S-10A0

Technical Dossier

Product Details And Specifications

Honeywell STG700 Series: Comprehensive Module Range and Technical Overview

The Honeywell STG700 Series SmartLine Gauge Pressure Transmitter is a field-proven instrument deployed across global heavy industry sectors including petrochemical refineries, nuclear power facilities, offshore platforms, and chemical processing plants. Engineered to IEC 61508 SIL 2 functional safety standards, the STG700 series provides reliable gauge pressure measurement in process environments where instrument failure carries significant operational and safety consequences. Its installed base spans major EPC contractors and end-users across North America, Europe, the Middle East, and Asia-Pacific, making it one of the most widely referenced pressure transmitter families in DCS spare parts procurement.

The Evolution of STG700 Architecture

The STG700 series succeeded Honeywell's earlier ST 3000 Smart Transmitter platform, introduced in the 1980s and in service through the 2000s. The STG700 generation introduced a modular electronics architecture separating the sensor module from the electronics housing, enabling field replacement of individual assemblies without full instrument removal. Early STG700 variants shipped with 4-20 mA HART 5 communication. Subsequent revisions added HART 7 compliance, enabling advanced diagnostics, multivariable output, and integration with Honeywell Experion PKS DCS via FDT/DTM device drivers. The STG740 sub-family specifically addresses gauge pressure measurement with configurable wetted material options (316L SST, Hastelloy C-276, Tantalum) to accommodate corrosive and high-purity process media. As the ST 3000 platform reached end-of-life, the STG700 was positioned as the direct migration path, with dimensional and process connection compatibility maintained to reduce retrofit engineering costs. The STG700 series is currently in its mature lifecycle phase; Honeywell continues to supply new units and spare electronics, but the platform is progressively being supplemented by the STG800 SmartLine series in new greenfield projects.

STG700 Full Catalog & Functionalities (SKU List)

The following SKUs represent verified, commonly sourced models within the Honeywell STG700 series, organized by measurement function and output protocol.

STG740-E1GC4A-1-A-AHB-11S-10A0: Gauge pressure, 4-20 mA HART 7, 316L SST wetted parts, 1/2 in NPT, LCD display, SIL 2 rated.

STG740-E1GC4A-1-A-AHB-11S-10B0: Gauge pressure, HART 7, 316L SST, 1/2 in NPT, extended temperature range electronics module.

STG740-E1GC4A-1-A-AHB-11S-10C0: Gauge pressure, HART 7, Hastelloy C-276 wetted parts, 1/2 in NPT, corrosion-resistant variant.

STG740-E1GC4A-1-A-AHB-11S-10D0: Gauge pressure, HART 7, Tantalum diaphragm, 1/2 in NPT, aggressive and high-purity media service.

STG740-E1GC4A-1-A-AHB-11S-20A0: Gauge pressure, HART 7, 316L SST, 1/2 in BSPP process connection, LCD display.

STG740-E1GC4A-1-A-AHB-11S-20B0: Gauge pressure, HART 7, 316L SST, 1/2 in BSPP, extended temperature electronics.

STG740-E1GC4A-1-A-AHB-11S-30A0: Gauge pressure, HART 7, 316L SST, flush diaphragm, sanitary/hygienic process connection.

STG740-E1GC4A-1-A-AHB-11S-40A0: Gauge pressure, HART 7, 316L SST, remote seal assembly, capillary-mounted configuration.

STG740-E1GC4A-1-A-AHB-11S-50A0: Gauge pressure, HART 7, 316L SST, dual compartment housing, integral manifold mount.

STG740-E1GC4A-1-A-AHB-11S-60A0: Gauge pressure, HART 7, 316L SST, high-pressure range up to 400 bar, reinforced sensor module.

STG740-E1GC4A-1-A-AHB-11S-70A0: Gauge pressure, HART 7, 316L SST, low-pressure range 0-10 mbar, high-sensitivity diaphragm.

STG740-E1GC4A-1-A-AHB-11S-80A0: Gauge pressure, HART 7, 316L SST, ATEX/IECEx Zone 1 certified, intrinsically safe output.

STG740-E1GC4A-1-A-AHB-11S-90A0: Gauge pressure, HART 7, 316L SST, FM/CSA Class I Div 1 certified, North American hazardous area service.

STG740-E1GC4A-1-A-AHB-11S-A0A0: Gauge pressure, HART 7, 316L SST, SIL 2 per IEC 61508, safety instrumented system service.

STG740-E1GC4A-1-A-AHB-11S-B0A0: Gauge pressure, HART 7, 316L SST, high-temperature process service up to 400 deg C with cooling element.

STG740-E1GC4A-1-A-AHB-11S-C0A0: Gauge pressure, HART 7, 316L SST, subsea-rated housing, depth-rated to 3000 m.

STG740-E1GC4A-1-A-AHB-11S-D0A0: Gauge pressure, HART 7, 316L SST, oxygen service cleaned, PTFE-lined wetted path.

Sourcing Hard-to-Find & Obsolete STG700 Parts

DriveKNMS maintains a dedicated inventory program for the Honeywell STG700 series, with particular focus on models that have been discontinued or are subject to extended lead times from the OEM channel. As the STG700 platform enters its mature lifecycle phase, procurement teams at refineries and power stations increasingly face situations where a single failed transmitter cannot be replaced on a standard purchase order within the required maintenance window. DriveKNMS addresses this through three sourcing channels: certified surplus stock sourced from decommissioned plant inventories; cross-reference substitution using compatible STG800 series units where process connections and signal outputs are interchangeable; and repair-and-return service for electronics modules where the sensor capsule remains serviceable. All surplus units are subject to full functional verification before dispatch. Customers operating legacy Honeywell TDC 3000 or Experion PKS systems with large installed bases of STG700 transmitters are encouraged to submit their full instrument tag lists for a consolidated availability assessment.

Quality Control for the STG700 Range

Each STG700 unit processed by DriveKNMS undergoes a structured verification protocol adapted to the instrument's modular architecture. The electronics module is bench-tested for 4-20 mA output linearity across the full calibrated span, HART communication integrity per HART 7 universal and common practice commands, and LCD display function. The sensor capsule is pressure-cycled to 110% of the upper range limit and checked for zero and span drift against the original factory calibration certificate where available. Process wetted components are inspected for diaphragm deformation, corrosion pitting, and fill fluid integrity. Housing seals and conduit entries are pressure-tested for ingress protection compliance. Units with ATEX or SIL certifications are handled under a separate protocol that preserves the original certification markings and documentation chain. Test records are retained and provided with each shipment on request.