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8B Isolated Analog Signal Conditioning Products

8B47

Linearized Thermocouple Input Modules

Description

8B modules are an optimal solution for monitoring real-world process signals

and providing high level signals to a data acquisition system. Each 8B47

module isolates, filters, amplifies, and linearizes a single channel of temperature

input from a thermocouple and provides an analog voltage output.

Linearization is accomplished using a four breakpoint piecewise linear

approximation.

The 8B47 can interface to industry standard thermocouple types:

J, K, and T and has an output signal of 0 to +5V. Each module is cold-junction

compensated to correct for parasitic thermocouples formed by the

thermocouple wire and screw terminals on the mounting backpanel. Upscale

open thermocouple detect is provided by an internal pull-up resistor.

Signal filtering is accomplished with a three-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 8B47 modules 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.

Figure 1: 8B47 Block Diagram

Features

 Interfaces to Types J, K, and T Thermocouples

 Linearizes Thermocouple Signal

 High Level Voltage Outputs

 1500Vrms Isolation

 ANSI/IEEE C37.90.1 Transient Protection

 Input Protected to 240VAC Continuous

 120dB CMR

 70dB NMR at 60Hz

 Low Drift with Ambient Temperature

 Accurate CJC -40°C to +85°C

 UL Listing Pending

 Mix and Match Module Types on Backpanel

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Pagina 1 - SensorLex

For information call 800-444-764426SensorLex 8B Isolated Analog Signal Conditioning Products8B8B47Linearized Thermocouple Input ModulesDescription8B

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Visit our website www.dataforth.com27SensorLex 8B Isolated Analog Signal Conditioning Products8BSpecificationsInput Range 0.1V to +0.5VInput Bias Cu

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