SCM7B34 RTD 2- or 3-Wire Input Modules

SKU: SCM7B34
Category: Signal Conditioning
Manufacturers: Dataforth

Interfaces to 100 Ohm Platinum or 120 Ohm Nickel RTDS
Provides 250µA RTD Excitation Current
Linearizes RTD Signal Response
CMRR up to 160dB, NMR up to 85dB
ATEX Compliant

Input Range
Output Range

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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 or 120 Ohm Nickel RTDS
Provides 250µA RTD Excitation Current
Linearizes RTD Signal Response
Accuracy, ±0.05% to ±0.15% of Span Typical
Nonconformity, ±0.025% to ±0.07% of Span Typical
Noise, 500µV Peak (5MHz), 250µV RMS (100kHz)
CMRR up to 160dB
NMR up to 85dB
ATEX Compliant

Each SCM7B34 RTD input module accepts a single channel of 100 ohm Platinum (a = 0.00385) or 120 ohm Nickel (a = 0.00672) RTD input and produces an input voltage in response to a low-level current excitation. The input signal is filtered, isolated, amplified, linearized, and converted to a high-level analog voltage for output to the process control system.

These modules incorporate a five-pole filtering approach to maximize both time and frequency response by taking advantage of both Thomson (Bessel) and Butterworth characteristics. One pole of the filter is on the field side of the isolation barrier; four are on the process control system side.

In response to the low-level current excitation signal, the RTD input signal is chopped by a proprietary chopper circuit and transferred across the transformer isolation barrier, suppressing transmission of common mode spikes and surges. The signal is then reconstructed and filtered for process control system output. Linearization is achieved by creating a non-linear transfer function through the module itself. This non-linear transfer function is configured at the factory and is designed to be equal and opposite to the specific RTD non-linearity. Lead compensation is achieved by matching two current paths thus cancelling the effects of lead resistance.

These Modules accept a wide 14 - 35VDC power supply range (+24VDC nominal). Their compact packages (2.13"x1.705"x0.605" max) save space and are ideal for high channel density applications. They are designed for easy DIN rail mounting using any of the "-DIN" backpanels.

Item information	Value
Output Type:	Analog
Module series:	7B Series
Input Type:	PT100/1000/RTD

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