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SensorLex8B34

Linearized 2- or 3-Wire RTD Input Modules, Bandwidth 3 Hz

SensorLex8B34 image

8B modules are an optimal solution for monitoring real-world process signals and providing high-level signals to a data acquisition system. Each 8B34 input module isolates, filters, amplifies, and linearizes a single channel of temperature input from an RTD and provides an analog voltage output.

RTD excitation is provided from the module using two matched current sources. When using a 3-wire connection, this method allows equal currents to flow through the sensor leads, canceling the effects of lead resistances.The excita-tion currents are small (0.25 mA) which minimizes self-heating of the RTD.

Signal filtering is accomplished with a 3-pole filter optimized for time and frequency response which provides 70 dB of normal-mode rejection at 60 Hz. One pole of this filter is on the field side of the isolation barrier for anti-aliasing, and the other two are on the system side.

A special input circuit on the 8B34 module provides protection against accidental connection of power-line voltages up to 240 VAC. Clamp circuits on the I/O and power terminals protect against harmful transients.

The modules are designed for installation in Class I, Division 2 hazardous locations and have a high level of immunity to environmental noise.

Circuit diagram Dataforth SensorLex8B34

Block Diagram SensorLex8B34



PDF Downloads:

  • Product Overview SensorLex8B
  • Produkt Catalog SensorLex8B
  • Backpanels and Accessories

  • 4 Modules for Type SensorLex8B34:

    ModuleInputDescription
    8B34-01 -100°C to +100°C SensorLex8B34 Isolated Linearized 2- or 3-Wire RTD Input Module with Voltage-Output
    8B34-02 0°C to +100°C SensorLex8B34 Isolated Linearized 2- or 3-Wire RTD Input Module with Voltage-Output
    8B34-03 0°C to +200°C SensorLex8B34 Isolated Linearized 2- or 3-Wire RTD Input Module with Voltage-Output
    8B34-04 0°C to +600°C SensorLex8B34 Isolated Linearized 2- or 3-Wire RTD Input Module with Voltage-Output

    Specifications

    top
    • Input: RTD
    • Output: 0 V … 5 V
    • Bandwidth 3 Hz
    • Isolation 1500 Vrms
    • Input protection 240 VAC
    • Input Resistance 50 MOhm
    • Accuracy ± 0.10°C bis ± 0.45°C
    • ANSI/IEEE C37.90.1 Input protection
    • CMR 120dB
    • True 2-way isolation
    • NMR: 70dB at 60Hz
    • Power Supply +5 VDC
    • Operating Temperature Range -40°C … +85°C
    • Mix and Match Types on Backpanels possible
    • Dimensions 28.1 x 41.9 x 10.2 mm
    • Optional DIN Rail Mounting
    • CE compliant, UL listed
    • Wide range of accessories
    • Special Solutions on request