Each SCM7B36 Potentiometer input module provides a single channel of resistance input which is filtered, isolated, amplified, and converted to a high level analog voltage output.

The SCM7B36 module interfaces to slidewires and potentiometers in both two or three wire configuration and incorporates a five-pole filtering approach to maximize both time and frequency response by taking advantage of both 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 the 3-Wire configuration, lead resistance compensation is provided if the resistance of the "x" lead is closely equivalent to that of the "+" lead. Internal to the module, measurement error due to lead resistance is canceled.

In response to the low level current excitation, and after initial field-side filtering, 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.

Six standard input resistance ranges are offered, from 100 Ohm to 10k Ohm, with three output ranges available: 0-5V, 1-5V, and 0-10V. Modules accept a wide 14-35VDC power supply range (+24VDC nominal). Their compact packages (2.13" x 1.705" x 0.605" max.) save space and are ideal for high channel density applications. They are designed for easy DIN rail mounting using any of Dataforth's "-DIN" backpanels.
  • Industry's First 7B Potentiometer Input Module
  • Interfaces 100 Ohm to 10k Ohm Potentiometers
  • 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 120VAC Continuous
  • CSA Certified, FM Approved
  • CE and ATEX Compliant
Isolated Potentiometer Input Modules

SCM7B36 Devices


Part Number Input RangeOutput RangeMechanical FormatIsolation VoltageIsolation Type
0 to 100 Ohms +1 to +5 V Modular plug-in-board 1500 Vrms Transformer 2-way
0 to 100 Ohms 0 to +5 V Modular plug-in-board 1500 Vrms Transformer 2-way
0 to 100 Ohms 0 to +10 V Modular plug-in-board 1500 Vrms Transformer 2-way
0 to 200 Ohms +1 to +5 V Modular plug-in-board 1500 Vrms Transformer 2-way
0 to 200 Ohms 0 to +5 V Modular plug-in-board 1500 Vrms Transformer 2-way
0 to 200 Ohms 0 to +10 V Modular plug-in-board 1500 Vrms Transformer 2-way
0 to 500 Ohms +1 to +5 V Modular plug-in-board 1500 Vrms Transformer 2-way
0 to 500 Ohms 0 to +5 V Modular plug-in-board 1500 Vrms Transformer 2-way
0 to 500 Ohms 0 to +10 V Modular plug-in-board 1500 Vrms Transformer 2-way
0 to 1000 Ohms +1 to +5 V Modular plug-in-board 1500 Vrms Transformer 2-way
0 to 1000 Ohms 0 to +5 V Modular plug-in-board 1500 Vrms Transformer 2-way
0 to 1000 Ohms 0 to +10 V Modular plug-in-board 1500 Vrms Transformer 2-way
0 to 5000 Ohms +1 to +5 V Modular plug-in-board 1500 Vrms Transformer 2-way
0 to 5000 Ohms 0 to +5 V Modular plug-in-board 1500 Vrms Transformer 2-way
0 to 5000 Ohms 0 to +10 V Modular plug-in-board 1500 Vrms Transformer 2-way
0 to 10000 Ohms +1 to +5 V Modular plug-in-board 1500 Vrms Transformer 2-way
0 to 10000 Ohms 0 to +5 V Modular plug-in-board 1500 Vrms Transformer 2-way
0 to 10000 Ohms 0 to +10 V Modular plug-in-board 1500 Vrms Transformer 2-way

Frequently Asked Questions


Can Dataforth provide calibration reports for modules I purchased?
Yes we can provide calibration reports for the modules that you purchased.

You can either
a) visit https://www.dataforth.com/TestDataReport.aspx to search for Test Report Datasheets by Serial Number or
b) you can send us a list of model numbers and their serial numbers to support@dataforth.com

Analog Devices announced a last time buy and discontinuance of their signal conditioning modules. Can I replace them with Dataforth signal conditioning modules?
Yes, in general, Dataforth signal conditioning modules are a direct replacement for all Analog Devices signal conditioning modules. e.g. "SCM5B35-xx: Linearized 4-Wire RTD Input Modules" will replace Analog Devices "5B35: Isolated 4 Wire RTD Input Signal Conditioning Module".

Please note that Dataforth signal conditioning modules are RoHS II compliant.

How do I convert an RMS voltage to its corresponding peak voltage?
To convert an RMS voltage to its corresponding peak voltage, you simply take the RMS voltage value and multiply it by the square root of 2, or roughly 1.414.

For example, 1500Vrms corresponds to a peak voltage of 1500 * 1.414 = 2121 Vp

Is the SCMXPRT-003 DIN rail mountable?
The SCMXPRT-001 has an option for DIN rail mounting (part number: SCMXPRT-001D) but the SCMXPRT-003 does not. Instead, it can be mounted on the SCMXRK-002 which is a 19 inch metal rack for mounting the SCMXPRT-003 as well as various Dataforth backpanels and the SCMXIF interface board.

If the input range of my signal conditioner is -1V to +1V and the output range is 0 to 10V, does this mean that it ignores polarity?
A signal conditioner with these I/O ranges does not mean that the module ignores the polarity of your voltage input. The output of voltage input modules are scaled linearly, meaning an input of -1V would correspond to an output of 0V, an input of 0V would correspond to an output of 5V, an input of +1V would correspond to an output of 10V, and so on.

How does the load resistance of a module affect the noise at the output?
Noise at the output of a module is independent of load resistance.

If I purchase a backplane with no CJC, will I still be able to use modules that require the CJC enable jumper to be installed?
Yes. Backplanes with no CJC will still come with the CJC enable installed on the backplane.

Is the calibration of Dataforth modules traceable to NIST standards?
Yes, calibration of Dataforth modules is traceable to NIST standards.
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