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SCM7B37

Non-Linearized Thermocouple Input Modules, Bandwidth 3 Hz

Each SCM7B37 non-linearized modules accept a single channel of input from Type J, K, T, E, R, S, or B thermocouples. The signal is filtered, isolated, amplified, and converted to a high-level analog voltage for output to the process control system.

Cold junction compensation (CJC) is performed using an NTC thermistor (see “Additional SCM7B Part Numbers” section for P/N and AN701 for further information) externally mounted under the field-side terminal block on the backpanel. Open thermocouple detection is upscale using a 30 nA current source in the input circuitry.

These modules incorporate a five-pole filtering approach to maximize both time and frequency response by taking advantage of both Thomson (Bessel) and Butterworth characteristics. One pole of the filter is on the field side of the isolation barrier; four are on the process control system side.

After the initial field-side filtering, the input signal is chopped by a proprietary chopper circuit and transferred across the transformer isolation barrier, sup-pressing transmission of common mode spikes and surges. The signal is then reconstructed and filtered for process control system output.

Modules accept a wide 14 - 35 VDC power supply range (+ 24 VDC nominal). Their compact packages (2.13" x1.705" x0.605" max) save space and are ideal for high channel density applications. They are designed for easy DIN rail mounting using any of the “-DIN” backpanels.

Circuit diagram Dataforth SCM7B37

Block Diagram SCM7B37



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15 Modules for Type SCM7B37:

ModuleInputDescription
SCM7B37B-07 Type B SCM7B37 Isolated Non-Linearized Thermocouple Input Module with Voltage-Output
SCM7B37E-04 Type E SCM7B37 Isolated Non-Linearized Thermocouple Input Module with Voltage-Output
SCM7B37J-01 Type J SCM7B37 Isolated Non-Linearized Thermocouple Input Module with Voltage-Output
SCM7B37J-10 Type J SCM7B37 Isolated Non-Linearized Thermocouple Input Module with Voltage-Output
SCM7B37J-11 Type J SCM7B37 Isolated Non-Linearized Thermocouple Input Module with Voltage-Output
SCM7B37J-12 Type J SCM7B37 Isolated Non-Linearized Thermocouple Input Module with Voltage-Output
SCM7B37J-13 Type J SCM7B37 Isolated Non-Linearized Thermocouple Input Module with Voltage-Output
SCM7B37K-02 Type K SCM7B37 Isolated Non-Linearized Thermocouple Input Module with Voltage-Output
SCM7B37K-20 Type K SCM7B37 Isolated Non-Linearized Thermocouple Input Module with Voltage-Output
SCM7B37K-21 Type K SCM7B37 Isolated Non-Linearized Thermocouple Input Module with Voltage-Output
SCM7B37K-22 Type K SCM7B37 Isolated Non-Linearized Thermocouple Input Module with Voltage-Output
SCM7B37K-23 Type K SCM7B37 Isolated Non-Linearized Thermocouple Input Module with Voltage-Output
SCM7B37R-05 Type R SCM7B37 Isolated Non-Linearized Thermocouple Input Module with Voltage-Output
SCM7B37S-06 Type S SCM7B37 Isolated Non-Linearized Thermocouple Input Module with Voltage-Output
SCM7B37T-03 Type T SCM7B37 Isolated Non-Linearized Thermocouple Input Module with Voltage-Output

Specifications

top
  • Input: Thermocouple Typ J, K, T, E, R, S, B and N
  • Output: 1 V … 5 V / 0 V … 5 V / 0 V … 10 V
  • Bandwidth 3 Hz
  • Isolation 1500 Vrms
  • Input protection 120 Vrms
  • Input Resistance 50 MOhm
  • Accuracy ± 0.03% (typ.), ± 0.1% (max.)
  • Linearity ± 0.01% (typ.), ± 0.02% (max.)
  • ANSI/IEEE C37.90.1 Input protection
  • CMR 160dB
  • True 2-way isolation
  • NMR: 80/85dB at 50/60Hz
  • Power Supply 14 to 35 VDC
  • Operating Temperature Range -40°C … +85°C
  • Mix and Match Types on Backpanels possible
  • Dimensions 54.1 x 43.3 x 15.4 mm
  • Optional DIN Rail Mounting
  • CSA certified, CE and ATEX compliant
  • Wide range of accessories
  • Special Solutions on request