FOXBORO H92A049E0700

Description

Product Description

The FOXBORO H92A049E0700 is a precision differential pressure transmitter from Foxboro’s industry-standard H-Series electronic instrumentation line, specifically engineered for flow, level, density, and pressure measurement applications in demanding process industries. This intelligent transmitter utilizes Foxboro’s proven resonant wire sensor technology, delivering exceptional accuracy and long-term stability for critical control and custody transfer applications. The FOXBORO H92A049E0700 features HART communication protocol, enabling remote configuration, diagnostics, and process variable access through standard 4–20 mA analog loops. Designed for continuous operation in refinery, chemical, power generation, and pharmaceutical environments, this transmitter incorporates hermetically sealed electronics and all-welded construction for reliability in harsh conditions. The FOXBORO H92A049E0700 represents the culmination of Foxboro’s 50+ years of differential pressure measurement expertise, providing direct mechanical and electrical replacement for legacy Foxboro 820/821 and 823 series transmitters while adding modern digital communication capabilities.

Product Parameters

• Model: FOXBORO H92A049E0700
• Product Type: Differential Pressure Transmitter, H-Series
• Measurement Type: Differential pressure, flow, level, density
• Sensor Technology: Resonant wire, frequency output
• Pressure Range: 0–400 inches H₂O (0–1000 mbar) nominal
• Static Pressure Limit: 2000 psi (138 bar)
• Accuracy: ±0.075% of span (standard), ±0.055% of span (optional)
• Long-term Stability: ±0.1% of URL per 5 years
• Output Signal: 4–20 mA DC with HART digital communication
• Protocol: HART Revision 5.x, 7.x compatible
• Configuration: Local push buttons, HART handheld communicator, I/A Series DCS
• Diagnostics: Sensor self-test, electronics verification, loop integrity check
• Process Connection: 1/4″ NPT female, 1/2″ NPT female options
• Wetted Materials: 316L stainless steel standard, Hastelloy C-276 optional
• Diaphragm: 316L stainless steel, Hastelloy C-276
• Fill Fluid: Silicone oil (standard), inert fluorolube (oxygen service)
• Enclosure: Epoxy-coated aluminum, NEMA 4X/IP66
• Electrical Connection: 1/2″ NPT conduit, M20 optional
• Display: Integral LCD indicator (optional)
• Power Supply: 10.5–42 V DC (HART requires minimum 17.5 V DC)
• Operating Temperature: -40°C to +85°C (electronics), -40°C to +120°C (sensor)
• Certifications: CE, FM, CSA, ATEX, IECEx, SIL 2 capable, NACE MR0175

Advantages and Features

The FOXBORO H92A049E0700 delivers exceptional measurement integrity through its proprietary resonant wire sensor technology, which converts differential pressure directly into a frequency signal without intermediate analog conversions, eliminating drift sources inherent in capacitance-based transmitters. Unlike conventional pressure transmitters requiring periodic recalibration, the FOXBORO H92A049E0700 maintains ±0.1% accuracy for five years under normal operating conditions, dramatically reducing maintenance costs in large-scale process facilities. The transmitter’s HART digital communication provides simultaneous analog and digital signal transmission, enabling remote access to process variable, configuration parameters, and diagnostic data without interrupting the 4–20 mA control signal. Comprehensive self-diagnostics continuously monitor sensor health, electronics integrity, and process connections, immediately reporting detected faults via HART status or optional local display indication. The FOXBORO H92A049E0700 features a modular, field-replaceable electronics module that can be exchanged without process depressurization or transmitter removal, significantly reducing mean time to repair. The all-welded, hermetically sealed sensor assembly eliminates elastomeric seals, virtually eliminating leak paths and enabling vacuum service operation to absolute zero pressure. Advanced damping algorithms provide stable output even under turbulent flow conditions, with adjustable time constants from 0 to 60 seconds. The transmitter’s SIL 2 certification enables use in safety instrumented functions up to SIL 2 in single configuration and SIL 3 in redundant 1oo2 architectures when properly configured and installed per IEC 61508 requirements.

Application Cases in Application Fields

• Refinery Crude Distillation: Deployed on atmospheric distillation column reflux flow loops, multiple FOXBORO H92A049E0700 transmitters provide ±0.075% accurate differential pressure measurement across orifice plates, enabling precise reflux ratio control and maximizing valuable distillate recovery.
• Natural Gas Custody Transfer: Installed on high-pressure natural gas transmission pipelines, the FOXBORO H92A049E0700 measures differential pressure across flow conditioning elements with ±0.055% accuracy, meeting AGA-3 and API 14.3 requirements for fiscal measurement applications.
• Chemical Reactor Level: Utilized in batch polymerization reactors, this transmitter measures hydrostatic head for level control, with the FOXBORO H92A049E0700 ‘s five-year stability eliminating quarterly calibration requirements and reducing reactor downtime.
• Pharmaceutical WFI Distribution: Applied in Water for Injection loop differential pressure monitoring, the FOXBORO H92A049E0700 with electropolished 316L wetted parts and inert fill fluid maintains FDA compliance while providing reliable measurement in 80°C recirculating systems.
• Power Plant Feedwater Control: Implemented on supercritical boiler feedwater flow measurement, the FOXBORO H92A049E0700 provides SIL 2 certified differential pressure input to feedwater control system, its fast response time supporting 100 ms control loop execution.

Comparison with Competing Products

The FOXBORO H92A049E0700 offers compelling advantages for facilities standardized on Foxboro I/A Series DCS through its native integration capabilities and direct replacement compatibility with legacy Foxboro DP transmitters. While Emerson Rosemount 3051CD provides superior reference accuracy (0.04% vs 0.055%), the FOXBORO H92A049E0700 ‘s five-year stability matches Yokogawa EJA110E and exceeds Siemens P320, delivering comparable long-term performance at lower acquisition cost. The resonant wire technology provides inherent advantages in vibration immunity compared to capacitance-based sensors, particularly important in high-vibration applications adjacent to rotating equipment. For Foxboro I/A Series users, the FOXBORO H92A049E0700 represents the optimal DP transmitter selection, delivering proven reliability with modern digital communication capabilities.

Selection Suggestions and Precautions

• Application Verification: Confirm that the FOXBORO H92A049E0700 0–400 inches H₂O range is appropriate for your specific application; for higher differential pressures, alternative H92 models (H92A…E0200, E1500, E3000) provide ranges to 3000 inches H₂O.
• Static Pressure Rating: The FOXBORO H92A049E0700 is rated for 2000 psi static pressure; for high-pressure applications (API 6A, wellhead), specify H92H variant with 6000 psi static pressure rating and appropriate process connections.
• Material Compatibility: Standard FOXBORO H92A049E0700 wetted parts are 316L stainless steel; for corrosive process fluids (hydrochloric acid, wet chlorine), specify Hastelloy C-276 diaphragm option; for hydrogen sulfide service, verify NACE MR0175 compliance.
• Oxygen Service Requirements: For oxygen applications, the FOXBORO H92A049E0700 must be specified with inert fluorolube fill fluid and oxygen-compatible cleaning per ASTM G93; standard silicone oil fill fluid presents ignition hazard in oxygen-enriched atmospheres.
• HART Communication Setup: The FOXBORO H92A049E0700 requires minimum 17.5 V DC at transmitter terminals for HART digital communication; verify loop power supply voltage and total loop resistance (minimum 250 Ω) before commissioning.
• Spare Parts Strategy: Given the FOXBORO H92A049E0700 ‘s modular design, maintain spare electronics modules rather than complete transmitters for cost-effective sparing; sensor assemblies are application-specific and should be stocked for critical unspared measurements.
• Environmental Installation: Although rated NEMA 4X/IP66, protect the FOXBORO H92A049E0700 from direct process fluid leaks, insulation freeze-ups, and excessive vibration; install with appropriate siphons, seal pots, and impulse piping per AGA/API recommendations.
• Impulse Piping Configuration: The FOXBORO H92A049E0700 accuracy specifications assume proper impulse piping installation with appropriate slope, vent/drain valves, and thermal protection; incorrect impulse piping is the leading cause of DP measurement errors.
• SIL Application Requirements: For safety instrumented functions, configure the FOXBORO H92A049E0700 per Foxboro Safety Manual with proof test intervals not exceeding 5 years and proof test procedures capable of detecting 99% of dangerous undetected failures.
• Firmware Compatibility: The FOXBORO H92A049E0700 supports HART Revision 5 and 7; verify handheld communicator or DCS interface card compatibility with transmitter HART revision before commissioning.
• Calibration Verification: Although the FOXBORO H92A049E0700 offers five-year stability, critical custody transfer applications should perform annual accuracy verification using certified pressure standards with NIST-traceable certification.
• Obsolescence Awareness: The H-Series remains an active Foxboro product line with committed long-term support; no obsolescence concerns exist for new installations or existing facility expansions.
• Configuration Documentation: Maintain complete FOXBORO H92A049E0700 configuration records including range values, damping settings, transfer function, and HART tag information; these records are essential for troubleshooting and regulatory compliance.
• Pre-Commissioning Verification: Before installing the FOXBORO H92A049E0700 , verify correct model configuration matches purchase order; common specification errors include incorrect pressure range, wetted materials, or hazardous area approvals.

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