dsca37j-01 Dataforth Corporation, dsca37j-01 Datasheet

dsca37j-01

Manufacturer Part Number

dsca37j-01

Description

Non-linearized Thermocouple Input Signal Conditioners

Manufacturer

Dataforth Corporation

Datasheet

1.DSCA37J-01.pdf (2 pages)

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DSCA37

Non-Linearized Thermocouple Input Signal Conditioners

Description

Each DSCA37 non-linearized thermocouple input module provides a single

channel of thermocouple input which is filtered, isolated, amplified, 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 DSCA37 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 ±5% to accommodate

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

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

Figure 1: DSCA37 Block Diagram

198

For information call 800-444-7644

High Performance Signal Conditioners

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

• 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

• ±0.05% Accuracy

• ±0.01% Linearity

• Easily Mounts on Standard DIN Rail

• C-UL-US Listed

• CE and ATEX Compliant

Thermocouples

0-20mA, or 4-20mA

Features

DSCA

Related parts for dsca37j-01

dsca37j-01 Summary of contents

Page 1

... The adjustments are made using potentiom- eters located under the front panel label and are non-interactive for ease of use. Figure 1: DSCA37 Block Diagram 198 ©1995-2009 Dataforth Corporation, All Rights Reserved ISO9001:2000-Registered QMS High Performance Signal Conditioners Features • Interfaces to Types and N Thermocouples • ...

Page 2

... Part No. Suffix Example NONE NA NONE DSCA37J-01 C DSCA37J-01C E DSCA37J-01E Material Iron vs. Copper-Nickel Nickel-Chromium vs. Nickel-Aluminum Copper vs. Copper-Nickel Nickel-Chromium vs. Copper-Nickel Platinum-13% Rhodium vs. Platinum Platinum-10% Rhodium vs. Platinum Platinum-30% Rhodium vs. Platinum-6% Rhodium Nickel-14.2% Chromium-1.4% Silicon vs. Nickel-4.4% Silicon- 0.1% Magnesium DSCA 1 ...

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