SCM7B34-01D

Isolated Process Control Signal Conditioning Products S C M 7 B SCM7B34/34N Isolated Linearized 2- or 3-Wire RTD Input Modules Description ach S B N RTD input module accepts a single channel of Platinum . or Nic el . RTD input and produces an input voltage in response to a low-level current excitation. The input signal is filtered, isolated, amplified, lineari ed, and converted to a high level analog voltage for output to the process control system (Figure 1). Features Interfaces to Nickel RTDs Platinum or Provides 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. A RTD xcitation urrent • Linearizes RTD Signal Response • Provides High-Level Voltage Outputs • 1500Vrms Transformer Isolation In response to the low-level current excitation signal, the RTD 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. • Accuracy, ± 0.05% to ± 0.15% of Span Typical • Nonconformity, ± 0.025% to ± 0.07% of Span Typical Lineari ation is achieved by creating a non linear transfer function through the module itself. This non linear transfer function is configured at the factory and is designed to be e ual and opposite to the specific RTD non linearity. Lead compensation is achieved by matching two current paths thus cancelling the effects of lead resistance. • ANSI/IEEE C37.90.1 Transient Protection 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 bac panels. • 85dB NMR at 60Hz, 80dB at 50Hz • Input Protected to 120Vrms Continuous Noise, pp H , rms H • 160dB CMRR • Easy DIN Rail Mounting SA S ertified • CE and ATEX Compliant 1500Vrms Isolation Barrier Shield* + Surge Suppression, Protection, Lead Compensation, LPF 2 (1 pole), and RTD Current Stimulus 1 – RTD X Iso-Chopper II™ Amplifier Pat. Pending LPF (4 pole) 4 5 0 VOUT COM Linearization Backpanel Term Block Field-Side NOTE: For 2-wire operation, jumper the (–) and (x) connections on the backpanel term block. +V –V 3 DC Supply * Shield ground-tie shown for ungrounded RTD sensor configuration. F ig u r e 1 : S C M 7 B 3 4 /3 4 N B l o ck D ia g r a m 7 4 ©1995-2017 Dataforth Corporation, All Rights Reserved Process Control System-Side For information call 800-444-7644 ISO9001:2008-Registered QMS DC Supply/ Oscillator 5 VS (14-35VDC) COM Isolated Process Control Signal Conditioning Products Typical❇ at Module Pt RTD See Ordering Information Protection Continuous Transient Ordering Information D SCM7B34 Input Signal Range Sensor Excitation Current Lead Resistance Effect and SCM7B34N Ni RTD * 120Vrms max ANSI/IEEE C37.90.1 A max (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) Nonconformity(4) Stability to Gain Input Offset Zero Suppression Output Offset 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, 90% Span Supply Voltage Current(2) Sensitivity . Model‡ Input Range Pt SCM7B34-01 F ± 0.075% . ± 0.15% . ± 0.025% . ± 0.05% . SCM7B34-02 to F to F ± 0.10% . ± 0.2% . ± 0.025% . ± 0.05% . SCM7B34-03 to F to F ± 0.075% . ± 0.15% . ± 0.025% . ± 0.05% . SCM7B34-04 to F to F ± 0.05% . ± 0.1% . ± 0.025% . ± 0.05% . SCM7B34-05 to F to F ± 0.05% . ± 0.1% . ± 0.025% . ± 0.05% . to F to F ± 0.15% . ± 0.3% . ± 0.06% . ± 0.12% . to F to F ± 0.15% . ± 0.3% . ± 0.07% . ± 0.14% . * * † † 40mW * Continuous Short to Ground ± 12V, ± 14mA * * * 1500Vrms ANSI/IEEE C37.90.1 160dB * * * See Ordering Information See Ordering Information * ppm * * i SCM7B34N-01 * ± 0.002%( RZ/RSPAN)(5) . Span * * SCM7B34N-02 * * RTI(6) * Output Ranges Available * 3Hz 80/85dB 250ms * † Upscale Non-deterministic Downscale