Emerson 248HANAA2XA

Emerson 248HANAA2XA

Product Overview:
The Emerson Rosemount 248HANAA2XA is a high-performance, DIN B form-factor temperature transmitter designed for single-point temperature measurement applications in industrial process control. It converts temperature signals from RTDs, thermocouples, and other sensors into standard 4-20mA analog signals with HART digital communication overlay. This transmitter is engineered for head-mount or DIN rail installation, providing reliable temperature monitoring in demanding environments across power generation, petrochemical, water treatment, and manufacturing industries.

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Description

Emerson 248HANAA2XA

Technical Specifications:

  • Brand: Emerson (Rosemount)
  • Model: 248HANAA2XA
  • Product Type: Temperature Transmitter
  • Form Factor: DIN B
  • Input Types: 2, 3, and 4-wire RTD, thermocouple, millivolt, ohm
  • Output: 2-wire 4-20mA with HART protocol
  • Power Supply: 12-42.2VDC (HART protocol), 9-32VDC (Foundation Fieldbus)
  • Digital Accuracy: 0.20°C (0.36°F) or 0.1% of span
  • Stability: 0.1% of reading or 0.1°C (0.18°F) per year
  • Ambient Temperature Effect: ±0.006°C per 1.0°C change
  • Operating Temperature: -50°C to +85°C
  • Storage Temperature: -50°C to +120°C
  • Humidity: 0-95% non-condensing
  • Electrical Isolation: 2.5kVAC input/output
  • Protection Rating: IP66/IP68 (depending on housing)
  • Certifications: IEC 61508 SIL2, ATEX, IECEx, Ex d/ia IIC T6, ABS, BV, DNV, LR
  • Communication: HART 5/7
  • Origin: United States

Functional Features:

  • Multi-Sensor Compatibility: Supports 2/3/4-wire RTD, thermocouple, potentiometer, linear resistor, and millivolt inputs
  • High Measurement Accuracy: 0.20°C digital accuracy for precise temperature monitoring
  • Excellent Stability: 0.1% reading or 0.1°C per year stability reduces calibration frequency
  • HART Communication: Enables remote configuration, diagnostics, and data reading
  • Fault-Safe Operation: NAMUR NE43 compliant fault indication (21-23mA for high fault, ≤3.6mA for low fault)
  • Automatic Calibration: Internal self-calibration with each temperature update eliminates long-term drift
  • Environmental Compensation: Built-in ambient temperature and cold junction compensation
  • Sensor Diagnostics: Real-time monitoring for open circuit, short circuit, and out-of-range conditions
  • Wide Power Range: 12-42.2VDC operation compatible with most industrial power systems
  • Global Certifications: Multiple explosion-proof and marine certifications for hazardous area use

Application Scenarios:

  • Temperature monitoring in power generation boiler and turbine systems
  • Reactor and distillation column temperature control in petrochemical plants
  • Storage tank temperature monitoring in oil and gas facilities
  • Fermentation tank and sterilizer temperature control in food and pharmaceutical industries
  • Transformer and generator winding temperature monitoring
  • Pipeline medium temperature measurement in process industries
  • HVAC system temperature monitoring
  • Marine and offshore platform temperature monitoring systems

Performance Parameters:

  • Accuracy: 0.20°C (0.36°F) or 0.1% of span
  • Stability: 0.1% of reading or 0.1°C per year
  • Response Time: Fast digital processing with configurable damping
  • Isolation: 2.5kVAC input/output isolation
  • EMC Performance: Compliant with EN61326 and NAMUR NE21 standards
  • Diagnostic Coverage: NAMUR NE107 compliant self-monitoring

Material Composition:

  • Industrial-grade electronic circuit board
  • Precision analog-to-digital converter
  • Microprocessor for signal processing
  • HART communication module
  • Input protection and isolation circuits
  • Aluminum, stainless steel, or polypropylene housing options
  • High-quality terminal blocks and connectors
  • Environmental sealing gaskets

Structural Features:

  • DIN B form factor for head-mount installation
  • Compact design for space-constrained applications
  • Front-accessible terminal blocks for sensor wiring
  • LED indicators for status indication
  • Local configuration interface
  • Robust housing with IP66/IP68 protection
  • DIN rail mounting option available
  • Sanitary connection options for food and pharmaceutical use

Working Principle:
The 248HANAA2XA receives temperature signals from field sensors (RTD, thermocouple, or millivolt sources) through its input terminals. The analog signal is amplified, filtered, and linearized through precision conditioning circuits. A high-resolution ADC converts the analog signal to digital values, which are processed by the internal microprocessor. The processor applies sensor-specific calibration constants, ambient temperature compensation, and cold junction compensation (for thermocouples) to ensure measurement accuracy. The processed temperature value is then converted to a proportional 4-20mA analog output signal, with HART digital communication superimposed on the analog signal. The transmitter continuously performs self-diagnostics, monitoring sensor integrity, internal circuitry, and communication status.

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