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Isolated Process Control Signal Conditioning Products

SCM7B

For information call 800-444-7644

SCM7B47

Isolated Linearized Thermocouple Input Modules

Description

SCM7B47 modules accept a single channel of input from Type J, K, T, E, R,

S, B, or N thermocouples. The signal is filtered, isolated, amplified, linearized,

and converted to a high level analog voltage for output to the process control

system (Figure 1).

Linearization is achieved by creating a non-linear transfer function through the

module itself; refer to AN505. This non-linear transfer function is configured at

the factory and is designed to be equal and opposite to the thermocouple

non-linearity.

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 (Figure 1). Open thermocouple detection is upscale using a 30nA

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,

suppressing transmission of common mode spikes and surges. The signal is

then reconstructed and filtered for process control system output.

Modules accept a wide 14 - 35VDC power supply range (+24VDC 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.

Figure 1: SCM7B47 Block Diagram

▲

Features

 Interfaces to Type J, K, T, E, R, S, B and N

Thermocouples

 Linearizes Thermocouple Signals

 Provides High Level Voltage Outputs

 1500Vrms Transformer Isolation

 Accuracy, ±0.06% to ±0.16% of Span Typical

 ANSI/IEEE C37.90.1 Transient Protection

 Input Protected to 120Vrms Continuous

 Noise, 1mV Peak (5MHz), 500µV RMS

(100kHz)

 CMRR, 160dB

 NMR, up to 85dB

 Easy DIN Rail Mounting

 CSA Certified, FM Approved

 CE and ATEX Compliant

Refer to AN701 for V

out

temperature conversion information

1 2

Indice de contenidos

Pagina 1 - Features

Isolated Process Control Signal Conditioning ProductsSCM7BFor information call 800-444-764484SCM7B47Isolated Linearized Thermocouple Input ModulesDesc

Pagina 2 - Ordering Information

SCM7BVisit our website www.dataforth.com85Isolated Process Control Signal Conditioning ProductsSCM7BSpecificationsInputSignal Range Thermocouple(1)(Se

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