8B35

Linearized 4-Wire RTD Input Modules

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 (0.25mA) which minimizes self-heating of the RTD.

Signal filtering is accomplished with a 3-pole filter optimized for time and frequency response which provides 70dB of normal-mode rejection at 60Hz. 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 240VAC. 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.
Certifications

Documents

3D CAD/STEP Files 3D CAD Models
Product Availability
Usually stock to 3-5 weeks. Contact Customer Service for current lead times.

Dimensions & Accessories

Features

  • Interfaces to 100Ω Platinum RTDs
  • True 4-Wire Input
  • Linearizes RTD Signal
  • High-Level Voltage Outputs
  • 1500Vrms Isolation
  • ANSI/IEEE C37.90.1 Transient Protection
  • Input Protection to 240VAC Continuous
  • 120dB CMR
  • 70dB NMR at 60Hz
  • Low Drift with Ambient Temperature
  • CE Compliant
  • C-UL-US Listed
  • ATEX Compliance Pending
  • Mix and Match Module Types on Backpanel

Block Diagram

Ordering
NOTE: Data in below table can be filtered. Please use the to make your selection. If you have any questions about the displayed data, please contact Customer Service at +1 520-741-1404 or sales@dataforth.com

Custom Modules

Below is a list of existing custom modules. If you don't see a module matching your target specifications, contact Customer Service and Application Support to discuss design guidelines and design feasibility. Customer Service and Application Support can be reached at sales@dataforth.com or +1-800-444-7644.
NOTE: Data in below table can be filtered. Please use the to make your selection. If you have any questions about the displayed data, please contact Customer Service at +1 520-741-1404 or sales@dataforth.com
* ... Status Codes: PR = Production, PT = Prototypes, QU = Quoted

FAQ

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