HONEYWELL XFR822A

Description

Product Description

HONEYWELL XFR822A is a Differential Pressure (DP) Transmitter from Honeywell’s SmartLine series of process instruments. This device is not a PLC spare part, but a critical smart field sensor that provides the primary process variable measurement to a PLC or DCS. The primary function of the HONEYWELL XFR822A is to accurately measure the difference in pressure between two points in a process and transmit a standardized 4-20 mA analog signal (with optional HART digital protocol) proportional to that measurement. It is commonly used for flow measurement (using an orifice plate, venturi, or flow nozzle), level measurement in pressurized vessels, filter monitoring, or any application requiring a precise differential pressure reading. The reliability and accuracy of the XFR822A directly determine the quality of the data used for control, alarming, and accounting. For control engineers, the HONEYWELL XFR822A is a foundational component in building reliable flow and level control loops.

Product Parameters / Technical Specifications

• Manufacturer: Honeywell (Process Solutions)
• Product Line: SmartLine Transmitters
• Functional Designation: Differential Pressure (DP) Transmitter
• Measurement Range: Available in various ranges (span), from very low (inches of water column) to high differential pressures. The “822” may indicate a specific range or model series.
• Accuracy: High accuracy, typically ±0.065% of calibrated span or better.
• Output Signal: 4-20 mA DC analog, superimposed with HART digital communication protocol (Bell 202 FSK).
• Power Supply: Standard two-wire loop-powered device (16-42 VDC typically). It uses the same two wires for both power and signal.
• Process Connections: Various options (e.g., 1/4″ NPT, 1/2″ NPT, DIN/ISO flange) for high-pressure (HP) and low-pressure (LP) sides.
• Materials: Wetted parts (diaphragms, flanges) typically in 316L stainless steel, Hastelloy C-276, or other alloys for corrosion resistance.
• Display: Integral local operator interface (LOI) with LCD for configuration and local readout.
• Communications: Configured and calibrated using the HART protocol via a handheld communicator or a PC-based software tool (e.g., Honeywell AMS Device Manager).

Advantages and Key Features

• High Accuracy and Stability: The HONEYWELL XFR822A provides exceptional measurement precision and long-term drift performance, which is critical for custody transfer, advanced control, and efficiency calculations.
• Smart HART Functionality: Beyond the 4-20 mA signal, the HART protocol allows for remote configuration, advanced diagnostics, and access to multivariable data (e.g., process variable, percent of range, device temperature).
• Robust and Reliable Design: Built to withstand harsh process environments, including high overpressure, wide temperature swings, and corrosive media.
• Easy Installation and Commissioning: The intuitive local operator interface (LOI) allows for zero and span adjustments on-site without a communicator. Its two-wire design simplifies installation.
• Global Safety Certifications: Typically carries important certifications like SIL 2/3 (for use in safety instrumented systems), FM/ATEX/IECEx for hazardous areas, and CE marking.
• Interoperability: As a HART device, it can be integrated with control systems from any manufacturer (e.g., Siemens, ABB, Emerson) that supports HART I/O or a HART multiplexer.

Application Cases in Industry

• Flow Measurement: The most common application. Used with an orifice plate to measure steam, gas, or liquid flow in pipelines within oil & gas, chemical, and power generation industries.
• Level Measurement in Pressurized Tanks: Used as a level transmitter by measuring the differential pressure between the bottom of a vessel (HP) and the top vapor space (LP).
• Filter and Pump Monitoring: Measures the pressure drop across filters, strainers, or heat exchangers to indicate clogging and schedule maintenance. Monitors pump differential pressure for performance.
• Combustion Control: Measures furnace draft (very low differential pressure) for safe and efficient burner operation.

Comparison with Competing Products

Selection Suggestions and Precautions

1. Correct Range Selection: Select the HONEYWELL XFR822A with a range (span) that places your normal operating differential pressure within 50-80% of the transmitter’s span for optimal accuracy. Do not grossly over-range the instrument.
2. Material Compatibility: Ensure the wetted materials (diaphragm, flanges, O-rings) are compatible with your process media to prevent corrosion and failure.
3. Impulse Line Management: Proper installation of impulse lines (piping from process to transmitter) is critical. Ensure they are sloped correctly to prevent gas entrapment (for liquid service) or liquid accumulation (for gas service). Use root valves and isolation manifolds.
4. Proper Grounding and Protection: Ensure the transmitter housing is properly grounded. In areas with lightning risk, install surge protectors on the signal lines. Use shielded cable and ground the shield at the control system end only.
5. Use HART Capabilities: Invest in a HART communicator or use system-integrated tools to fully leverage the XFR822A‘s capabilities for configuration, calibration, and troubleshooting.
6. Sourcing from Instrumentation Specialists: Purchase the XFR822A from authorized Honeywell process instrumentation distributors or reputable industrial suppliers who can provide selection support, calibration, and warranty services.

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