8B47 Linearized Thermocouple Input Modules

8B47 Linearized Thermocouple Input Modules

SKU: 8B47
Category: Signal Conditioning
Manufacturers: Dataforth

Interfaces to Types J, K, and T Thermocouples
Linearizes Thermocouple Signal
120dB CMR
70dB NMR at 60Hz
Accurate CJC –40°C to +85°C

Input Range
Output Range

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141,30 €

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From	Unit price
5	150,72 €*
10	144,44 €*
20	141,30 €*

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Description
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Interfaces to Types J, K, and T Thermocouples
Linearizes Thermocouple Signal
High-Level Voltage Outputs
1500Vrms Isolation
ANSI/IEEE C37.90.1 Transient Protection
120dB CMR
70dB NMR at 60Hz
Accurate CJC –40°C to +85°C
Low Drift with Ambient Temperature

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. The 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.

The 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 8B47 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.