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Isolated Process Control Signal Conditioning Products

SCM7B

For information call 800-444-7644

SCM7B32/33

Isolated Process Current/Voltage Input Modules

Description

The SCM7B32 current input modules accept input signals in the 4-20mA or 0-

20mA ranges from the field and provide a high level output to the process control

system (Figure 1). Current to voltage conversion occurs internal to the module,

which is factory calibrated to ensure the highest accuracy.

SCM7B33 voltage input modules accept input signals in the +1V to +5V or 0 to

+5V ranges from the field and provide a high level output to the process

control system. As an alternative, the SCM7B33 can be used with an external

250Ω resistor (Dataforth SCM7BXR1 or equivalent), to accept input signals in

the 4-20mA or 0-20mA ranges. Using the external sense resistor allows the

module to be removed without disrupting the current loop. All SCM7B33s are

shipped with a SCM7BXR1 resistor.

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.

After the initial field-side filtering (conversion-SCM7B32 only), the 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.

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.

Figure 1: SCM7B32/33 Block Diagram

▲

Features

 Accepts Current or Voltage Input

 Provides High Level Voltage Outputs

 1500Vrms Transformer Isolation

 Accuracy, ±0.03% of Span Typical,

±0.1% Max

 ANSI/IEEE C37.90.1 Transient Protection

 Input Protected to 120Vrms Continuous

 Noise, 500µV Peak (5MHz), 300µV RMS

(100kHz)

 CMRR, up to 105dB

 80dB Per Decade of Attenuation

Above 100Hz

 Easy DIN Rail Mounting

 CSA Certified, FM Approved

 CE and ATEX Compliant

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Página 1 - SCM7B32/33

Isolated Process Control Signal Conditioning ProductsSCM7BFor information call 800-444-764470SCM7B32/33Isolated Process Current/Voltage Input ModulesD

Página 2 - Ordering Information

SCM7BVisit our website www.dataforth.com71Isolated Process Control Signal Conditioning ProductsSCM7BSpecificationsTypical at 25°C and +24VDCModule

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