Honeywell STG940-A1G-00000-M4-E9 Smart Pressure Transmitter | Replacement, Equivalent & Selection Guide
The Honeywell STG940-A1G-00000-M4-E9 is a high-performance SmartLine® Gauge Pressure Transmitter designed for demanding industrial process control environments. Part of Honeywell’s trusted STG900 series, this transmitter delivers exceptional accuracy, long-term stability, and seamless integration with DCS and SCADA systems. This page provides full technical specifications, compatible replacement models, and a comprehensive selection guide to help engineers and procurement teams make confident sourcing decisions.
Technical Specifications
| Model | STG940-A1G-00000-M4-E9 |
| Brand | Honeywell |
| Series | SmartLine® STG900 |
| Type | Gauge Pressure Transmitter |
| Measurement Range | 0 to 400 inH₂O (0 to 1 kPa – 10 MPa configurable) |
| Output Signal | 4–20 mA HART (with digital communication) |
| Accuracy | ±0.04% of span (reference accuracy) |
| Long-Term Stability | ±0.1% URL per 10 years |
| Process Connection | 1/4–18 NPT (A1G option) |
| Wetted Materials | 316L SST diaphragm, SST process flange |
| Housing | Aluminum alloy, dual-compartment |
| Enclosure Rating | IP66/IP67, NEMA 4X |
| Ambient Temperature | –40°C to +85°C (–40°F to +185°F) |
| Power Supply | 10.5–42.4 VDC |
| Communication Protocol | HART 7 (M4 option) |
| Display | LCD with bargraph (E9 option) |
| Approvals | ATEX, IECEx, FM, CSA, CE |
| Weight | Approx. 1.36 kg |
Compatible Replacement & Equivalent Models
When the STG940-A1G-00000-M4-E9 is unavailable or under evaluation, the following models offer functional equivalence or direct replacement capability:
| Model | Brand | Type | Compatibility Notes |
| STG940-E1G-00000-M4-E9 | Honeywell | Gauge Pressure | Same series, different process connection (1/2–14 NPT) |
| STG944-A1G-00000-M4-E9 | Honeywell | Gauge Pressure | Higher range variant within STG900 series |
| 3051CG (3051CG5A02A1AH2) | Emerson Rosemount | Gauge Pressure | Industry-standard equivalent; HART compatible; widely used in DCS migration |
| EJA430E-DAS4N-912NN | Yokogawa | Gauge Pressure | High-accuracy alternative; HART/FOUNDATION Fieldbus options |
| PMP71 (7MF4033) | Siemens SITRANS P | Gauge Pressure | Compatible with Siemens PCS 7; suitable for cross-brand migration |
| ABB 266GSH | ABB | Gauge Pressure | Direct mounting equivalent; HART 7 protocol |
Note: Always verify process connection, range, and protocol before substitution. Contact Konmask for cross-reference validation.
Why Choose the Original Model
- Proven SmartLine® Technology: Honeywell’s proprietary sensor technology delivers ±0.04% accuracy with minimal drift over a 10-year lifecycle.
- Native Experion® Integration: Plug-and-play compatibility with Honeywell Experion PKS, TPS, and TDC 3000 DCS platforms.
- Advanced Diagnostics: Built-in self-diagnostics via HART 7 reduce unplanned downtime and support predictive maintenance strategies.
- Hazardous Area Certified: ATEX/IECEx/FM approvals make it suitable for Zone 1/2 and Division 1/2 classified areas.
- LCD Display (E9): On-site process variable readout eliminates the need for a separate indicator.
- Long-Term Availability: Honeywell’s global supply chain ensures parts and support availability for 10+ years.
Typical Applications
- Oil & gas upstream/midstream/downstream pressure monitoring
- Chemical and petrochemical process control
- Refinery distillation column pressure measurement
- Power generation boiler and steam system monitoring
- Pharmaceutical and food & beverage hygienic process lines
- Water and wastewater treatment plant instrumentation
- Pulp and paper mill process control
System Compatibility
- Honeywell DCS: Experion PKS, TPS, TDC 3000 — native HART integration
- Emerson DeltaV / Ovation: Compatible via HART multiplexer or AMS Device Manager
- Yokogawa CENTUM VP: Compatible via HART I/O cards
- Siemens PCS 7: Compatible via HART-enabled I/O modules
- ABB System 800xA: Compatible via HART communication
- Rockwell PlantPAx: Compatible via HART pass-through on 1756-IF16H modules
- SCADA / Historian: OSIsoft PI, Aspen InfoPlus.21, Wonderware — via DCS gateway
Selection Guide
Use the model number breakdown below to configure or verify your STG940 order code:
| Position | Code | Description |
| Series | STG940 | SmartLine Gauge Pressure Transmitter, standard range |
| Process Connection | A1G | 1/4–18 NPT, 316 SST, flush-mount |
| Options | 00000 | No additional hardware options |
| Communication | M4 | HART 7 protocol |
| Display | E9 | LCD display with bargraph |
Need a different range, connection type, or output protocol? Contact our selection team for a customized configuration recommendation.
Quality Assurance & Sourcing
- Authentic & Traceable: All units sourced through authorized distribution channels with full traceability documentation.
- Inspection & Testing: Each unit undergoes incoming inspection including visual check, label verification, and functional test where applicable.
- Packaging: Original OEM packaging preserved; anti-static and moisture-proof protection for transit.
- Documentation: Certificate of conformance, calibration records, and datasheet available upon request.
- Warranty: 12-month warranty against manufacturing defects from date of shipment.
How to Order
- Confirm your full model number: STG940-A1G-00000-M4-E9
- Specify required quantity and delivery timeline.
- Submit your inquiry via email or phone — our team responds within 1 business day.
- Receive quotation with lead time, pricing, and availability confirmation.
- Place order; receive shipping notification with tracking within 24–48 hours of dispatch.
Email: support@konmask.com
Phone/WhatsApp: +0086 19859288691
Website: https://konmask.com
Replacement & Compatibility FAQ
Q: Can the Emerson Rosemount 3051CG directly replace the STG940-A1G-00000-M4-E9?
A: In most cases yes — both use 4–20 mA HART output and similar process connections. However, verify the URL (upper range limit), process connection size, and DCS I/O card compatibility before substitution.
Q: Is the STG940 compatible with Foundation Fieldbus?
A: The M4 option specifies HART 7. For Foundation Fieldbus, you would need the STG940 with the M5 communication option. Contact us to verify availability.
Q: What is the difference between STG940 and STG944?
A: The STG944 supports higher static pressure ratings and is suited for differential pressure applications with higher line pressure. The STG940 is optimized for standard gauge pressure measurement.
Q: Can I get a calibration certificate with my order?
A: Yes. Factory calibration certificates are available upon request at time of order. Third-party calibration can also be arranged.
Q: What is the lead time for STG940-A1G-00000-M4-E9?
A: Stock availability varies. Contact us for real-time inventory status. Expedited sourcing is available for urgent requirements.
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Contact: support@konmask.com | +0086 19859288691
