SCM7B36-01D

Isolated Process Control Signal Conditioning Products S C M 7 B SCM7B36 Isolated Potentiometer Input Modules Description 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 (Figure 1). The S B module interfaces to slidewires and potentiometers in both two or three wire configuration and incorporates a five pole filtering approach to maximi e both time and fre uency response by ta ing 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 ire 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 to , with three output ranges available , , and . odules 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 the DIN bac panels. F i g u r e 1 : S C M 7 B 3 6 B l o ck Features • Industry’s First 7B Potentiometer Input Module Interfaces ©1995-2017 Dataforth Corporation, All Rights Reserved • 1500Vrms Transformer Isolation • Accuracy, ± 0.03% of Span Typical, ± 0.1% Max • ANSI/IEEE C37.90.1 Transient Protection • Input Protected to 120Vrms Continuous • 120dB CMRR • 85dB NMR at 60Hz, 80dB at 50Hz • Easy DIN Rail Mounting SA S ertified • CE and ATEX Compliant For information call 800-444-7644 ISO9001:2008-Registered QMS Potentiometers • Provides High-Level Voltage Outputs D ia g r a m 7 8 to Isolated Process Control Signal Conditioning Products Typical❇ at and Module Input Range Protection Continuous Transient Sensor Excitation Current Lead Resistance Effect (3-Wire)(1) Output Range(2) (See Output Range) ffective Available Power(2) Resistance Protection Voltage/Current Limit CMV (Input to Output) Continuous Transient CMRR (50 or 60Hz) Accuracy(3) Linearity(4) Stability to Input Offset Output Offset Gain Noise Peak at 5MHz B/W RMS at 10Hz to 100kHz B/W Peak at 0.1Hz to 10Hz B/W Open Input Response ‘ +’ Lead ‘ – ’ Lead ‘ x’ Lead Open Input Detection Time Frequency and Time Response Bandwidth, – 3dB NMR (50/60Hz) Step Response, 0 to 90% Supply Voltage Current(2) Sensitivity Mechanical Dimensions (h)(w)(d) Environmental Operating Temperature Range Storage Temperature Range Relative Humidity Emissions EN61000-6-4 Radiated, Conducted Immunity EN61000-6-2 RF ESD, EFT Ordering Information D SCM7B36 Model (See Ordering Information) 120Vrms max ANSI/IEEE C37.90.1 A to thru A . . . † 40mW Continuous Short to Ground ± 12V, ± 14mA SCM7B36-01 SCM7B36-02 SCM7B36-03 SCM7B36-04 SCM7B36-05 SCM7B36-06 Input Range to to to to to to S C M 7 B Specifications S C M 7 B Output Ranges Available † Output Range Part o u fi +1 to +5V 0 to +5V 0 to +10V NONE A D am e SCM7B36-01 SCM7B36-01A SCM7B36-01D 1500Vrms ANSI/IEEE C37.90.1 120dB ± 0.03% ± 0.1% ± 0.01% ± 0.02% Span typical, Span max Span typical, Span max . ppm 1mV RTI(5) Upscale Non-deterministic Downscale