Impulse DSCA47 User Manual download pdf

High Performance Signal Conditioners

DSCA

For information call 800-444-7644

154

DSCA47

Linearized Thermocouple Input Signal Conditioners

Description

Each DSCA47 thermocouple input module provides a single channel of thermocouple

input which is filtered, isolated, amplified, linearized, and converted to a high level

voltage output. Signal filtering is accomplished with a five-pole filter which provides 85dB

of normal-mode-rejection at 60Hz and 80dB at 50Hz. An anti-aliasing pole is located

on the field side of the isolation barrier, and the other four poles are on the system 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 DSCA47 can interface to eight industry standard thermocouple types: J, K, T, E,

R, S, B and N. Each module has cold junction compensation to correct for parasitic

thermocouples formed by the thermocouple wire and input screw terminals on the

module. Upscale open thermocouple detection is provided by internal circuitry.

Downscale indication can be implemented by installing a 47MΩ, ±20% resistor

between screw terminals 6 and 8 on the input terminal block.

Module output is either voltage or current. For current output models a dedicated

loop supply is provided at terminal 3 (+OUT) with loop return located at terminal 4 (-OUT).

The system-side load may be either floating or grounded.

Special input circuits provide protection against accidental connection of power-line

voltages up to 240VAC and against transient events as defined by ANSI/IEEE

C37.90.1. Protection circuits are also present on the signal output and power

input terminals to guard against transient events and power reversal. Power lines

are secured to the module using screw terminals which are in pluggable terminal

blocks for ease of system assembly and reconfiguration.

The modules have excellent stability over time and do not require recalibration,

however, zero and span settings are adjustable up to ±3% to accommodate

Figure 1: DSCA47 Block Diagram

▲

Features

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

Thermocouples

 Linearizes Thermocouple Signal

 Industry Standard Output of either 0-10V,

0-20mA, or 4-20mA

 1500Vrms Transformer Isolation

 ANSI/IEEE C37.90.1 Transient Protection

 Input Protected to 240VAC Continuous

 True 3-Way Isolation

 Wide Range of Supply Voltage

 160dB CMR

 85dB NMR at 60Hz, 80dB at 50Hz

 ±0.08% Accuracy

 Easily Mounts on Standard DIN Rail

 C-UL-US Listed

 CE and ATEX Compliant

situations where fine-tuning is desired. The adjustments are made using potentiometers

located under the front panel label and are non-interactive for ease of use.

1 2

Summary of Contents

Page 1 - Features

High Performance Signal ConditionersDSCAFor information call 800-444-7644154DSCA47Linearized Thermocouple Input Signal ConditionersDescriptionEach DSC

Page 2 - Ordering Information

High Performance Signal ConditionersDSCAVisit our website www.dataforth.com155DSCASpecificationsModuleTypical at TA=+25°C and +24V supply voltageDSCA4

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Impulse DSCA47 User Manual

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