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Phone：+86 15383419322Description
The FOXBORO RH101AA represents a precision-engineered pressure transmitter from Emerson’s renowned Foxboro measurement portfolio, designed for critical process control in demanding industrial environments. As part of the Foxboro RH Series, this FOXBORO RH101AA utilizes advanced piezoresistive sensor technology to deliver highly accurate pressure, level, and flow measurements across corrosive and high-temperature applications. Engineered with an all-welded metallic isolation diaphragm and vacuum-sealed sensor capsule, it achieves exceptional stability (±0.075% per year) and immunity to hydraulic shock. The transmitter features a modular design supporting HART 7, FOUNDATION Fieldbus, or PROFIBUS PA protocols for seamless DCS/PLC integration. Its robust construction includes Hastelloy C-276 wetted parts and dual-compartment electronics housing rated for NEMA 4X/IP67 environments. The Foxboro RH101AA excels in refinery, chemical, and power generation applications where SIL 2 compliance and 5-year drift-free performance are non-negotiable requirements for safety instrumented systems (SIS).
FOXBORO RH101AA
Technical Specifications
| Parameter Name | Parameter Value |
| Product Model | RH101AA |
| Manufacturer | FOXBORO (Emerson) |
| Product Type | Pressure Transmitter |
| Measuring Range | 0-100 mbar to 0-690 bar |
| Accuracy | ±0.075% of span (calibrated) |
| Output Signal | 4-20 mA HART / Fieldbus |
| Wetted Materials | Hastelloy C-276, Kalrez O-rings |
| Process Connection | 1/2″ NPT / DIN EN 1092-1 flange |
| Operating Temperature | -40°C to 125°C (process) |
| Protection Rating | IP67 / NEMA 4X |
| Power Supply | 10.5-42 VDC |
| Response Time | <100 ms |
| Certifications | SIL 2 (IEC 61508), ATEX, IECEx |
| Long-Term Stability | ±0.1% URL/10 years |
Main Features and Advantages
Unmatched Measurement Integrity: The FOXBORO RH101AA employs a monolithic sensor with laser-trimmed temperature compensation (-40°C to 125°C), eliminating measurement drift during thermal cycling. Its patented “DynaDrive” digital signal processing detects microvolt-level changes for resolution down to 0.01% FS.
Extreme Environment Resilience: Featuring a gold-plated sensor diaphragm and vacuum-sealed reference cavity, the transmitter withstands hydrogen permeation in petrochemical processes. The dual-chamber electronics housing incorporates hydrophobic membranes and surge protection up to 40V/m EMF.
Smart Diagnostics: Integrated Predictive Health Monitoring analyzes sensor stress patterns, alerting to diaphragm fatigue or seal degradation before failure. Configuration flexibility includes zero-lift without process isolation and local LCD display (optional R11 module).
FOXBORO RH101AA
Application Field
The FOXBORO RH101AA dominates in precision-demanding sectors:
Oil & Gas: Subsea christmas tree pressure monitoring (API 17S compliant) with H₂S resistance for sour gas fields
Chemical Processing: Reactor pressure control in PVC/VCM production using flush diaphragms for slurry media
Power Generation: Feedwater drum level measurement in supercritical boilers (ASME B40.100)
Pharmaceutical: Sterile bioreactor pressure tracking with 3-A Sanitary certified versions
Pulp & Paper: Digester vessel overpressure protection via SIL 2-certified redundant loops
Related Products
RH102AA: Higher density model for 1035 bar applications
IDP10: Intrinsic safety barrier for Zone 0 installations
R11: Local operator interface module
IOP241: Fieldbus I/O card for Foxboro DCS integration
P33: Calibration hand pump kit
RH100AA: Basic version without diagnostics
FBM247: Foundation Fieldbus interface module
Installation and Maintenance
Pre-installation preparation: Verify process compatibility with RH101AA‘s material chart (EM.23.EN.001). Isolate process and discharge static via grounding stud before mounting. Orient transmitter vertically with process connection downward to prevent gas entrapment. Use 316SS impulse tubing with slope ≥1:12 for liquid applications.
Maintenance recommendations: Perform zero calibration quarterly using magnetic zero button. Check diaphragm integrity via HART command “Sensor_Verify”. Replace filling fluid (DC200) every 5 years in high-vibration installations. For SIL systems, validate performance using P33 test kit per IEC 61511.
