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| SCM5B37 Thermocouple Input Modules FEATURES q INTERFACES TO TYPES J, K, T, E, R, S, C, N AND B THERMOCOUPLES q HIGH LEVEL VOLTAGE OUTPUTS q 1500Vrms TRANSFORMER ISOLATION q ANSI/IEEE C37.90.1-1989 TRANSIENT PROTECTION q INPUT PROTECTED TO 240VAC CONTINUOUS q 160dB CMR q 95dB NMR AT 60Hz, 90dB at 50Hz q 0.05% ACCURACY q 0.02% LINEARITY q 1V/C DRIFT q CSA CERTIFIED, FM APPROVED, CE COMPLIANT q MIX AND MATCH SCM5B TYPES ON BACKPANEL The SCM5B modules are designed with a completely isolated computer side circuit which can be floated to 50V from Power Common, pin 16. This complete isolation means that no connection is required 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 22, the Read-Enable pin to I/O Common, pin 19. 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 backpanel. Upscale open thermocouple detect is provided by an internal pull-up resistor. Downscale indication can be implemented by installing an external 47M resistor, 20% tolerance, between screw terminals 1 and 3 on the SCMPB01/02/03/04/05/06 backpanels. 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%. A special input circuit on the SCM5B37 modules provides protection against accidental connection of power-line voltages up to 240VAC. For Class I, Division 2 hazardous location applications, refer to Dataforth installation manual MA1146 (available upon request). DESCRIPTION Each SCM5B37 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 1). This voltage output is logicswitch controlled, allowing these modules to share a common analog bus without the requirement of external multiplexers. +2.5V 100M 4 NC 4 +In Thermocouple -In -EXC 1 3 5 2 3 6 Surge Suppression and Protection +EXC LPF IsochopperTM Amplifier Pat Pending LPF 20 VOUT 19 +V -V 22 I/O Common Precision Reference Isolated Computer-Side Power RD EN\ Backpanel Term Block 1 2 Temp Sensor CJC +V -V 17 Isolated Field-Side Power Power Oscillator +5V 16 Power Common FIGURE 1. SCM5B37 Block Diagram. DATAFORTH A Burr-Brown Company (R) Call 800-444-7644 For Information and Assistance SPECIFICATIONS Typical at T Module Input Range Input Bias Current Input Resistance Normal Power Off Overload Input Protection Continuous Transient CMV, Input to Output Continuous Transient CMR (50Hz or 60Hz) NMR Accuracy(1) Nonlinearity Stability Input Offset Output Offset Gain Noise Input, 0.1 to 10Hz Output, 100kHz Bandwidth, -3dB Response Time, 90% Span Output Range Output Resistance Output Protection Output Selection Time (to 1mV of VOUT) Output Current Limit Output Enable Control Max Logic "0" Min Logic "1" Max Logic "1" Input Current, "0", "1" Open Input Response Open Input Detection Time Cold Junction Compensation Accuracy, 25C Accuracy, +5C to +45C Accuracy, -40C to +85C Power Supply Voltage Power Supply Current Power Supply Sensitivity Mechanical Dimensions Environmental Operating Temp. Range Storage Temp. Range Relative Humidity RFI Susceptibility A = +25C and +5V power. SCM5B37 -0.1V to +0.5V -25nA 50M 40k 40k 240Vrms max ANSI/IEEE C37.90.1-1989 1500Vrms max ANSI/IEEE C37.90.1-1989 160dB 95dB at 60Hz, 90dB at 50Hz 0.05% Span 10V RTI(2) 0.02% Span 1V/C(3) 20V/C 25ppm/C 0.2Vrms 200Vrms 4Hz 0.2s 0V to +5V 50 Continuous Short to Ground 6s at Cload = 0 to 2000pF +8mA +0.8V +2.4V +36V 0.5A Upscale 10s 0.25C 0.5C 1.25C +5VDC 5% 30mA 2V/% RTI(2) 2.28" x 2.26" x 0.60" (58mm x 57mm x 15mm) -40C to +85C -40C to +85C 0 to 95% Noncondensing 0.5% Span Error at 400MHz, 5W, 3ft NOTES: (1) Includes nonlinearity, hysteresis and repeatability. Does not include CJC accuracy. (2) RTI = Referenced to input. (3)This is equivalent to C as follows: Type J 0.020 C/C, Types K, T 0.025C/C, Type E 0.016C/C, Types R, S 0.168C/C. Type N 0.037C/C, Type C, 0.072C/C. ORDERING INFORMATION MODEL SCM5B37J SCM5B37K SCM5B37T SCM5B37E SCM5B37R SCM5B37S SCM5B37B SCM5B37C SCM5B37N TYPE Type J Type K Type T Type E Type R Type S Type B Type C Type N INPUT RANGE -100C to +760C (-148F to +1400F) -100C to +1350C (-148F to +2462F) -100C to +400C (-148F to +752F) 0C to +900C (+32F to +1652F) 0C to +1750C (+32F to +3182F) 0C to +1750C (+32F to +3182F) 0C to +1800C (+32F to +3272F) +350C to +1300C (+662F to +2372F) -100C to +1300C (-148F to +2372F) OUTPUT RANGE 0V to +5V 0V to +5V 0V to +5V 0V to +5V 0V to +5V 0V to +5V 0V to +5V OV to +5V 0V to +5V Call 800-444-7644 For Information and Assistance DATAFORTH A Burr-Brown Company (R) SCM5B |
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