SCM7B35 current input modules accept input signals in the 4-20mA range from the field and provide a high-level voltage output to the process control system. Current to voltage conversion occurs internal to the module, which is factory calibrated to ensure the highest accuracy.

Loop power is provided by the module, enabling a 2-wire transmitter to be directly connected without the need for a separate dc power supply for the 2-wire transmitter.

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, 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 18 - 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.
  • 2-Wire Transmitter Interface
  • Accepts 4-20mA Signals
  • Provides an Isolated +24VDC Supply to Power the Loop
  • Provides High-Level Voltage Outputs
  • 1500Vrms Transformer Isolation
  • Accuracy, ±0.03% of Span Typical, ±0.1% Max
  • ANSI/IEEE C37.90.1 Transient Protection
  • 120Vrms Input Protection
  • CMRR, 105dB
  • 80dB Per Decade of Attenuation Above 100Hz
  • Easy DIN Rail Mounting
  • CSA Certified, FM Approved
  • CE and ATEX Compliant
Isolated 2-Wire Transmitter Interface Modules With Loop Power

SCM7B35 Devices


Part Number Input RangeOutput RangeMechanical FormatInternal Power SupplyIsolation VoltageIsolation TypeAccuracySupply Voltage
4 to 20 mA +1 to +5 V Modular plug-in-board Powers 2-Wire Transmitter 1500 Vrms Transformer 2-way ±0.03% Span typical, ±0.1% Span max 18 to 30 VDC
4 to 20 mA 0 to +5 V Modular plug-in-board Powers 2-Wire Transmitter 1500 Vrms Transformer 2-way ±0.03% Span typical, ±0.1% Span max 18 to 30 VDC
4 to 20 mA 0 to +10 V Modular plug-in-board Powers 2-Wire Transmitter 1500 Vrms Transformer 2-way ±0.03% Span typical, ±0.1% Span max 18 to 30 VDC
4 to 20 mA +2 to +10 V Modular plug-in-board Powers 2-Wire Transmitter 1500 Vrms Transformer 2-way ±0.03% Span typical, ±0.1% Span max 18 to 30 VDC

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.