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SCM5B47

Linearized Thermocouple Input Signal Conditioners, Bandwidth 4 Hz

Each SCM5B47 thermocouple input module provides a single channel of thermocouple input which is filtered, isolated, amplified, linearized and con-verted to a high-level analog voltage output. This voltage output is logic-switch controlled, allowing these modules to share a common analog bus without the requirement of external multiplexers.

The SCM5B modules are designed with a completely isolated computer side circuit which can be floated to ± 50 V 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 SCM5B47 can interface to eight industry standard thermocouple types: J, K, T, E, R, S, N, and B. Its corresponding output signal operates over a 0 V to + 5 V 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 47 MΩ resistor, ± 20 % tolerance, between screw terminals 1 and 3 on the SCMPB01/02/03/04/05/06/07 backpanels.

Signal filtering is accomplished with a six-pole filter which provides 95 dB of normal-mode rejection at 60 Hz and 90 dB at 50 Hz. 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 + 5 VDC, ± 5%.

A special input circuit on the SCM5B47 modules provides protection against accidental connection of power-line voltages up to 240 VAC.

Circuit diagram Dataforth SCM5B47

Block Diagram SCM5B47



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15 Modules for Type SCM5B47:

ModuleInputDescription
SCM5B47B-11 Type B SCM5B47 Isolated Linearized Thermocouple Input Module with Voltage-Output
SCM5B47E-08 Type E SCM5B47 Isolated Linearized Thermocouple Input Module with Voltage-Output
SCM5B47J-01 Type J SCM5B47 Isolated Linearized Thermocouple Input Module with Voltage-Output
SCM5B47J-02 Type J SCM5B47 Isolated Linearized Thermocouple Input Module with Voltage-Output
SCM5B47J-03 Type J SCM5B47 Isolated Linearized Thermocouple Input Module with Voltage-Output
SCM5B47J-12 Type J SCM5B47 Isolated Linearized Thermocouple Input Module with Voltage-Output
SCM5B47K-04 Type K SCM5B47 Isolated Linearized Thermocouple Input Module with Voltage-Output
SCM5B47K-05 Type K SCM5B47 Isolated Linearized Thermocouple Input Module with Voltage-Output
SCM5B47K-13 Type K SCM5B47 Isolated Linearized Thermocouple Input Module with Voltage-Output
SCM5B47K-14 Type K SCM5B47 Isolated Linearized Thermocouple Input Module with Voltage-Output
SCM5B47N-15 Type N SCM5B47 Isolated Linearized Thermocouple Input Module with Voltage-Output
SCM5B47R-09 Type R SCM5B47 Isolated Linearized Thermocouple Input Module with Voltage-Output
SCM5B47S-10 Type S SCM5B47 Isolated Linearized Thermocouple Input Module with Voltage-Output
SCM5B47T-06 Type T SCM5B47 Isolated Linearized Thermocouple Input Module with Voltage-Output
SCM5B47T-07 Type T SCM5B47 Isolated Linearized Thermocouple Input Module with Voltage-Output

Specifications

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  • Input: Thermocouple Typ J, K, T, E, R, S, B and N
  • Output: 0 … 5 V or 0 … 10 V
  • Bandwidth 4 Hz
  • Isolation 1500 Vrms
  • Input protection 240 Vrms
  • Input Resistance 50 MOhm
  • Accuracy ± 0.07% bis ± 0.16%
  • ANSI/IEEE C37.90.1 Input protection
  • CMR 160dB
  • True 3-way isolation
  • NMR: 95/90dB at 60/50Hz
  • Power Supply +5 VDC
  • Operating Temperature Range -40°C … +85°C
  • Mix and Match Types on Backpanels possible
  • Dimensions 58 x 57 x 15 mm
  • Optional DIN Rail Mounting
  • CSA certified, CE and ATEX compliant
  • Wide range of accessories
  • Special Solutions on request