SmartLine® ST700 Gauge Pressure Transmitters are ideal for applications ranging from high-pressure measurements in boilers and fuel feeds to tank level measurement applications with a relatively high process temperature.
Dual Head Gauge Pressure Transmitters are suited for typical applications involving reaction vessels in the chemical industry and level applications with process temperatures up to 257°F /125°C. In-Line transmitters are screwed directly onto a 1/2” male NPT nipple and can be installed in hazardous environments for accurate, repeatable pressure measurement. Typical applications include high-pressure measurement in boilers, fuel feeds and high-pressure reaction vessels in the petrochemical and hydrocarbon recovery industries.
Uses piezoresistive sensor technology with on-chip temperature compensation, giving high accuracy and stability.
Modular design for flexibility and easier maintenance / spare‑part stocking.
Standard accuracy: up to 0.055% of span, optional down to 0.04%.
Very stable over time: up to 0.02% of URL per year (for a 10‑year horizon).
Very wide pressure range options:
STG73x: 0‑50 psi (~0‑3.5 bar)
STG74x: 0‑500 psi (0‑35 bar)
STG77x: 0‑3,000 psi (0‑210 bar)
STG78x: up to 6,000 psi (420 bar)
STG79x: up to 10,000 psi (690 bar)
High rangeability (turndown) – up to 100:1.
Fast response: as low as 100 ms.
Damping is adjustable (0 … 32 seconds) to smooth the output if needed.
Process (media) temperature: up to 125°C (257°F) in some models.
On‑board automatic temperature compensation helps maintain performance across temperature changes.
Process-facing parts (wetted): options include 316L stainless steel and Hastelloy C-276 (for more corrosive processes) in both in-line and dual-head versions.
Enclosure rating: IP66 / IP67 per spec sheet.
Process connection options: ½″ NPT internal thread or flange, depending on model.
4‑20 mA analog output.
Digital / smart protocols: HART (v7), FOUNDATION™ Fieldbus, and Honeywell Digitally Enhanced (DE).
External zero / span and configuration capability.
Polarity-insensitive electrical connections (easy / safe wiring).
On-board diagnostics to monitor health and performance.
Integral dual seal design for safety (meets ANSI/NFPA 70-202 and ANSI/ISA 12.27.0).
Functional safety: SIL‑2 / SIL‑3 compliance available.
Explosion / hazardous‑area certifications: ATEX, IECEx, FM, CSA (depending on model).
Compliance with Experion® PKS (Honeywell’s DCS) for seamless integration