8B34 RTD 2- or 3-Wire Input Modules

SKU: 8B34
Category: Signal Conditioning
Manufacturers: Dataforth

Interfaces to 100 Ohm Platinum RTDs
Linearizes RTD Signal
High-Level Voltage Outputs
120dB CMR
Low Drift with Ambient Temperature

Input Range
Output Range

from

141,30 €

excl. 19% VAT , plus

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

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Description
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Interfaces to 100 Ohm Platinum RTDs
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

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.

The 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 excitation currents are small (0.25mA) which minimizes self-heating of the RTD.

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 8B34 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.