Key Benefits and Advantages
Reliable Piezoresistive Technology: The STG700 utilizes Honeywell’s proven piezoresistive sensor technology. This sensor provides inherent temperature and static pressure compensation, ensuring that the gauge pressure measurement remains stable even as ambient conditions change throughout the day.
Flexible Mechanical Configurations:
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In-Line Models: Feature a compact, lightweight design that screws directly onto a 1/2-inch male NPT nipple. These are perfect for fuel feeds, steam lines, and space-constrained installations.
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Dual Head Models: Ideal for applications requiring a 1/2-inch NPT connection or mounting to a small flange. This configuration is widely used for hydrostatic level measurement in vented vessels.
Modular Architecture for Life Cycle Savings: The STG700 shares its modular design with the entire SmartLine family. The display, communication module, and terminal block are interchangeable. This means you can replace a damaged part or upgrade your communication protocol (e.g., from 4-20mA to HART) in minutes without taking the transmitter out of the process line.
Seamless Control System Integration: With support for HART 7, Honeywell Digitally Enhanced (DE), FOUNDATION Fieldbus, and PROFIBUS PA, the STG700 is compatible with almost any DCS or PLC. This allows for rich diagnostic data to be sent back to the control room for predictive maintenance.
Standard Safety Compliance: Every STG700 is SIL 2/3 certified. This ensures the device meets strict reliability standards for use in Safety Instrumented Systems (SIS), such as high-pressure trip loops in boilers or chemical reactors.
Local Configuration and Diagnostics: The optional LCD interface allows for local zero/span adjustments. The advanced graphics display version can even show historical trends, providing operators with immediate insights into process stability at the measurement point.
Technical Properties
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Measurement Type: Gauge Pressure (relative to atmosphere).
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Reference Accuracy: Up to 0.065% of span.
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Stability: 0.02% of URL per year for 5 years.
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Turndown Ratio: Up to 100:1.
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Communication: HART 7, DE, FOUNDATION Fieldbus, or PROFIBUS PA.
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Enclosure Rating: IP66/67 and NEMA 4X.
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Materials: 316L Stainless Steel or Hastelloy C-276.
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Process Temperature: Up to 257°F (125°C) for In-Line; up to 302°F (150°C) for Dual Head.
Field of Application
The STG700 is a versatile workhorse suitable for general pressure monitoring.
Primary Industries and Uses:
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Power Generation: Monitoring pump discharge and steam header pressure.
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Oil and Gas: Gauge pressure monitoring on wellheads and gathering lines.
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Chemical Processing: Measuring vessel pressures in non-corrosive or moderately corrosive service.
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Water and Wastewater: Tracking pressure in distribution mains and filtration systems.
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HVAC and Utilities: Reliable monitoring of instrument air and chilled water loops.
