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SensorLex8B35

Linearized 4-Wire RTD Input Modules, Bandwidth 3 Hz

SensorLex8B35 image

8B modules are an optimal solution for monitoring real-world process signals and providing high-level signals to a data acquisition system. Each 8B35 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 a precision current source. Excitation current does not flow in the input signal leads, which allows RTD measurements to be made independently of lead resistance. The excitation 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 8B35 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 SensorLex8B35

Block Diagram SensorLex8B35



PDF Downloads:

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

  • 4 Modules for Type SensorLex8B35:

    ModuleInputDescription
    8B35-01 -100°C to +100°C SensorLex8B35 Isolated Linearized 4-Wire RTD Input Module with Voltage-Output
    8B35-02 0°C to +100°C SensorLex8B35 Isolated Linearized 4-Wire RTD Input Module with Voltage-Output
    8B35-03 0°C to +200°C SensorLex8B35 Isolated Linearized 4-Wire RTD Input Module with Voltage-Output
    8B35-04 0°C to +600°C SensorLex8B35 Isolated Linearized 4-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