SCM5B37C

Isolated Analog Signal Conditioning Products S C M 5 B SCM5B37 Non-Linearized Thermocouple Input Modules Description Each SCM5B37 non-linearized thermocouple input module provides a single channel of thermocouple input which is filtered, isolated, amplified, and converted to a high level analog voltage output Figure . This voltage output is logic-switch controlled, allowing 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 . The SCM5B37 can interface to nine industry standard thermocouple types: J, K, T, E, R, S, C, N, and B. Its corresponding output signal operates over a 0V to +5V range. Each module is cold-junction compensated to correct for parasitic thermocouples formed by the thermocouple wire and screw terminals on the mounting bac panel. pscale open thermocouple detect is provided by an internal pull up resistor. Downscale indication can be implemented by installing an external resistor, tolerance, between screw terminals and on the S PB bac panels. Signal filtering is accomplished with a six pole filter which provides dB 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%. F i g u r e 1 : S C M 5 B 3 7 B l o ck Features • Interfaces to Types J, K, T, E, R, S, C, N and B Thermocouples • High-Level Voltage Output • 1500Vrms Transformer Isolation • ANSI/IEEE C37.90.1 Transient Protection • Input Protected to 240VAC Continuous • 160dB CMR • 95dB NMR at 60Hz, 90dB at 50Hz • ± 0.03% Accuracy • ± 0.005% Linearity Drift SA S ertified • CE and ATEX Compliant • Mix and Match SCM5B Types on Backpanel A special input circuit on the SCM5B37 modules provides protection against accidental connection of power-line voltages up to 240VAC. D ia g r a m 1 8 ©1995-2017 Dataforth Corporation, All Rights Reserved For information call 800-444-7644 ISO9001:2008-Registered QMS Specifications Typical❇ at TA and Module Input Range Input Bias Current Input Resistance Normal Power Off Overload Input Protection Continuous Transient Ordering Information D power SCM5B37 – 0.1V to +0.5V – 25nA Type‡ TC Model Output Range† Input Range SCM5B37J J to F to F SCM5B37K K to F to F SCM5B37T T 1500Vrms max ANSI/IEEE C37.90.1 160dB 95dB at 60Hz, 90dB at 50Hz to F to SCM5B37E E to F to F Accuracy Linearity Stability Input Offset Output Offset Gain Noise Input, 0.1 to 10Hz Output, 100kHz Bandwidth, – 3dB Response Time, 90% Span See Ordering Information ± 0.005% Span SCM5B37R R to F to F SCM5B37S S to F to F SCM5B37B B to F to F Output Range Output Resistance Output Protection Output Selection Time (to ± 1mV of VOUT) Output Current Limit See Ordering Information SCM5B37C C to F to F SCM5B37N N to F to F CMV, Input to Output Continuous Transient CMR (50Hz or 60Hz) NMR Output nable ontrol Max Logic “0” Min Logic “1” Max Logic “1” Input Current “0,1” Open Input Response Open Input Detection Time Cold Junction Compensation Accuracy, Accuracy, to Accuracy, to fix 240Vrms max ANSI/IEEE C37.90.1 (2) ppm . rms rms 4Hz 0.2s Continuous Short to Ground s at load = 0 to 2000pF +8mA ± 0.03% . 3, 4 ± 0.03% . 3, 4 ± 0.03% . 3, 4 ± 0.03% . 3, 4 ± 0.03% . 3, 4 ± 0.03% . 3, 4 ± 0.03% . 3, 4 ± 0.03% . 3, 4 ± 0.03% . Thermocouple Alloy Combinations S t a n d a r d s: Type J K T E R S B C N . . . +5VDC ± 5% 30mA RTI(3) Mechanical Dimensions (h)(w)(d) 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 NOTES: ❇ ontact factory or your local Dataforth sales office for maximum values. Includes linearity, hysteresis and repeatability. Does not include accuracy. This is e uivalent to as follows Type . , Types , T . , Type . , Types R, S . , Type N . , Type , . (3) RTI = Referenced to input. 3, 4 ‡ +0.8V +2.4V +36V . A Upscale