SCM7B35-02

Isolated Process Control Signal Conditioning Products S C M 7 B SCM7B35 Isolated 2-Wire Transmitter Interface Modules With Loop Power Description 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 (Figure 1). Current to voltage conversion occurs internal to the module, which is factory calibrated to ensure the highest accuracy. Features • 2-Wire Transmitter Interface • Accepts 4-20mA Signals Loop power is provided by the module, enabling a wire transmitter to be directly connected without the need for a separate dc power supply for the 2-wire transmitter. • Provides an Isolated +24VDC Supply to Power the Loop These modules incorporate a five pole filtering approach to maximi e both time and fre uency response by ta ing 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. • Provides High-Level Voltage Outputs 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 spi es and surges. The signal is then reconstructed and filtered for process control system output. • ANSI/IEEE C37.90.1 Transient Protection • 1500Vrms Transformer Isolation • Accuracy, ± 0.03% of Span Typical, ± 0.1% Max • 120Vrms Input Protection • 105dB CMRR • Easy DIN Rail Mounting 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 bac panels. +Vloop + – 2-wire Transmitter X SA S ertified • CE and ATEX Compliant 1500Vrms Isolation Barrier Surge 1 Suppression, Protection Iso-Chopper II™ Amplifier Pat. Pending Surge 2 Suppression, Protection 0 NC LPF (4 pole) LPF & I-V 5 Backpanel Term Block Field-Side 3 –V F i g u r e 1 : S C M 7 B 3 5 B l o ck DC Supply Loop Supply D ia g r a m 7 6 ©1995-2017 Dataforth Corporation, All Rights Reserved For information call 800-444-7644 ISO9001:2008-Registered QMS VOUT COM Process Control System-Side +V +Vloop 4 DC Supply/ Oscillator 5 VS (18-30VDC) COM Isolated Process Control Signal Conditioning Products Typical❇ at and Ordering Information D Module Input Signal Range Protection Continuous Transient Loop Voltage(1) Output Signal Range(2) 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 Gain Input Offset Output Offset Noise Peak at 5MHz B/W RMS at 10Hz to 100kHz B/W Peak at 0.1Hz to 10Hz B/W Frequency and Time Response Bandwidth, – 3dB NMR (– 3dB at 100Hz) Step Response, 90% Span 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 SCM7B35 Model SCM7B35-01 SCM7B35-01A SCM7B35-01D SCM7B35-02 4-20mA 120Vrms max ANSI/IEEE C37.90.1 +24VDC Input Range Output Range 4 to 20mA 4 to 20mA 4 to 20mA 4 to 20mA +1 to +5V 0 to +5V 0 to +10V +2 to +10V S C M 7 B Specifications S C M 7 B See Ordering Information 40mW Continuous Short to Ground ± 16V, ± 14mA 1500Vrms ANSI/IEEE C37.90.1 105dB ± 0.03% ± 0.1% ± 0.01% ± 0.02% . Span typical, Span max Span typical, Span max ppm N/A(5) Span 5mV RTI(6) 100Hz dB per Decade above 5ms H 18 to 30VDC 56mA ± 0.0002%/ %V S 2.13” x 1.705” x 0.605” max (54.1mm x 43.3mm x 15.4mm max) to to 0 to 95% Noncondensing ISM, Group 1 Class A ISM, Group 1 Performance A ± 0.5% Span Error Performance B NOTES: ❇ ontact factory or your local Dataforth sales office for maximum values. will be supplied to the loop for an open loop condition. Approximately to will be supplied for a corresponding 4mA to 20mA input. Loop voltage is independent of supply voltage. Output Range and Supply urrent specifications are based on minimum output load resistance. inimum output load resistance is calculated by OUT2/PE, where PE is the Output ffective Available Power that guarantees output range, accuracy, and linearity specifications. Accuracy includes the effects of repeatability, hysteresis, and linearity. Linearity is calculated using the best fit straight line method. Input offset term included in output offset specification. (6) RTI = Referenced to Input. Visit our website www.dataforth.com ©1995-2017 Dataforth Corporation, All Rights Reserved 7 7 ISO9001:2008-Registered QMS