dsca47k-14 Dataforth Corporation, dsca47k-14 Datasheet

dsca47k-14

Manufacturer Part Number

dsca47k-14

Description

Linearized Thermocouple Input Signal Conditioners

Manufacturer

Dataforth Corporation

Datasheet

1.DSCA47K-14.pdf (2 pages)

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DSCA47

Linearized Thermocouple Input Signal Conditioners

Description

Each DSCA47 thermocouple input module provides a single channel of thermo-

couple 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 transmis-

sion 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 termi-

nals on the module. Upscale open thermocouple detection is provided by internal

circuitry. Downscale indication can be implemented by installing a 47MW, ±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

212

For information call 800-444-7644

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.

High Performance Signal Conditioners

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

• Linearizes Thermocouple Signal

• Industry Standard Output of either 0-10V,

• 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

Thermocouples

0-20mA, or 4-20mA

Features

DSCA

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dsca47k-14 Summary of contents

Page 1

... 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 212 ©1995-2009 Dataforth Corporation, All Rights Reserved ISO9001:2000-Registered QMS High Performance Signal Conditioners Features • Interfaces to Types and N Thermocouples • ...

Page 2

... DSCA47K-04 ANSI/IEEE C37.90.1 ±0.5°C DSCA47K-05 ±1.25°C See Ordering Information DSCA47K-13 600Ω 8mA (V ), 30mA (I ) OUT OUT DSCA47K-14 Continuous ANSI/IEEE C37.90.1 DSCA47T-06 1500Vrms max ANSI/IEEE C37.90.1 DSCA47T-07 50VDC max 160dB DSCA47E-08 ±3% Zero and Span DSCA47R-09 ±0.5µV/°C ), ±20ppm/°C (I ...

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