SCM5B34-03D

Isolated Analog Signal Conditioning Products S C M 5 B SCM5B34 Linearized 2- or 3-Wire RTD Input Modules Description Each SCM5B34 RTD input module provides a single channel of RTD input which is filtered, isolated, amplified, lineari ed, and converted to a high-level analog voltage output (Figure 1). This voltage output is logic switch controlled, which allows these modules to share a common analog bus without the re uirement of external multiplexers. The SCM5B modules are designed with a completely isolated computer side circuit which can be oated to from Power ommon, pin . This complete isolation means that no connection is re uired between I O Common and Power Common for proper operation of the output switch. If desired, the output switch can be turned on continuously by simply connecting pin , the Read nable pin, to I O ommon, pin . RTD excitation is provided from the module by two matched current sources. When using a three-wire RTD, this method allows an equal current to ow in each RTD lead, which cancels the effects of lead resistances. The excitation currents are very small . mA for Pt and Ni, and . mA for u which minimi es self heating of the RTD. Signal filtering is accomplished with a six pole filter which provides 95dB of normal-mode rejection at 60Hz and 90dB at 50Hz. Two poles of this filter are on the field side of the isolation barrier, and the other four are on the computer side. After the initial field side filtering, the input signal is chopped by a proprietary chopper circuit. Isolation is provided by transformer coupling, again using a proprietary technique to suppress transmission of common mode spikes or surges. The module is powered from +5VDC, ± 5%. Features Interfaces to Platinum, or Nic el RTDs • Linearizes RTD Signal • High-Level Voltage Outputs • 1500Vrms Transformer Isolation • ANSI/IEEE C37.90.1 Transient Protection • Input Protected to 240VAC Continuous • 160dB CMR • 95dB NMR at 60Hz, 90dB at 50Hz SA S ertified • CE and ATEX Compliant • Mix and Match SCM5B Types on Backpanel A special input circuit on the SCM5B34 modules provides protection against accidental connection of power-line voltages up to 240VAC. F i g u r e 1 : S C M 5 B 3 4 B l o ck D ia g r a m 1 2 ©1995-2017 Dataforth Corporation, All Rights Reserved For information call 800-444-7644 ISO9001:2008-Registered QMS opper, Specifications Typical❇ at TA Module Input Range Limits Input Resistance Normal Power Off Overload Input Protection Continuous Transient Sensor Excitation Current Pt, Ni u Lead Resistance Effect Pt, Ni u CMV, Input to Output Continuous Transient CMR (50 or 60Hz) NMR and Ordering Information D power SCM5B34 to to to Model Pt Ni u SCM5B34-02 to F to F 240Vrms max ANSI/IEEE C37.90.1 SCM5B34-03 to F to F 0.25mA 1.0mA SCM5B34-04 to F to F SCM5B34-05 to F to F (1) . (1) 1500Vrms max ANSI/IEEE C37.90.1 160dB 95dB at 60Hz, 90dB at 50Hz See Ordering Information ± 0.025% Span Output Range Output Resistance Output Protection Output Selection Time (to ± 1mV of VOUT) Output Current Limit See Ordering Information Continuous Short to Ground s at load = 0 to 2000pF Output nable ontrol Max Logic “0” Min Logic “1” Max Logic “1” Input Current “0,1” +0.8V +2.4V +36V . A Power Supply Voltage Power Supply Current Power Supply Sensitivity Pt, Ni u 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 Pt SCM5B34-01 Output Range† F Accuracy Conformity Error(3) Stability Input Offset Output Offset Gain Noise Input, 0.1 to 10Hz Output, 100kHz Bandwidth, – 3dB Response Time, 90% Span Open Input Response Open Input Detection Time Input Range to F to . Cu SCM5B34C-01 to at F to SCM5B34C-02 . to at F to ppm of Reading . S C M 5 B rms rms 4Hz 0.2s +8mA Downscale 3s +5VDC ± 5% 30mA . . 2.28” x 2.26” x 0.60” (58mm x 57mm x 15mm) to to 0 to 95% Noncondensing ISM, Group 1 Class A ISM, Group 1 Performance A ± 0.5% Span Error Performance B SCM5B34C-03 i SCM5B34N-01 ** Accuracy(2) 3, 4 . 3, 4 . 3, 4 . 3, 4 . 3, 4 . 3, 4 . 3, 4 . 3, 4 . 3, 4 . F F to at F to F to F to F RTD Standards Type A Pt Ni u a Coe ficient 0.00385 0.00672 0.004274 DIN JIS IEC DIN 43760 JIS C 1604-1989 IEC 751 Output Ranges Available † Output Range Part o u fi 3. 0V to +5V 4. 0V to +10V NONE D am e SCM5B34-01 SCM5B34-01D NOTES : ❇ ontact factory or your local Dataforth sales office for maximum values. refers to the resistance in one lead. Includes conformity, hysteresis and repeatability. (3) Conformity error is ± 0.05% Span for SCM5B34N-01. Visit our website www.dataforth.com ©1995-2017 Dataforth Corporation, All Rights Reserved 1 3 ISO9001:2008-Registered QMS S C M 5 B Isolated Analog Signal Conditioning Products