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SCM5B37

Non-Linearized Thermocouple Input Signal Conditioners, Bandwidth 4 Hz

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. 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 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 + 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 SCM5B37 modules provides protection against accidental connection of power-line voltages up to 240 VAC.

Circuit diagram Dataforth SCM5B37

Block Diagram SCM5B37



PDF Downloads:


9 Modules for Type SCM5B37:

ModuleInputDescription
SCM5B37B Type B SCM5B37 Isolated Non-Linearized Thermocouple Input Module with Voltage-Output
SCM5B37C Type C SCM5B37 Isolated Non-Linearized Thermocouple Input Module with Voltage-Output
SCM5B37E Type E SCM5B37 Isolated Non-Linearized Thermocouple Input Module with Voltage-Output
SCM5B37J Type J SCM5B37 Isolated Non-Linearized Thermocouple Input Module with Voltage-Output
SCM5B37K Type K SCM5B37 Isolated Non-Linearized Thermocouple Input Module with Voltage-Output
SCM5B37N Type N SCM5B37 Isolated Non-Linearized Thermocouple Input Module with Voltage-Output
SCM5B37R Type R SCM5B37 Isolated Non-Linearized Thermocouple Input Module with Voltage-Output
SCM5B37S Type S SCM5B37 Isolated Non-Linearized Thermocouple Input Module with Voltage-Output
SCM5B37T Type T SCM5B37 Isolated Non-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 ± 0.03%
  • Linearity ± 0.005%
  • 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