dsca34-05 Dataforth Corporation, dsca34-05 Datasheet

dsca34-05

Manufacturer Part Number

dsca34-05

Description

Linearized 2- Or 3-wire Rtd Input Signal Conditioners

Manufacturer

Dataforth Corporation

Datasheet

1.DSCA34-05.pdf (2 pages)

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DSCA34

Linearized 2- or 3-Wire RTD Input Signal Conditioners

Description

Each DSCA34 RTD input module provides a single channel of RTD 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.

RTD excitation is provided from the module using a precision current source.

Lead compensation is achieved by matching two current paths which cancels

the effects of lead resistance. The excitation current is small ( approx. 0.25mA)

which minimizes self-heating of the RTD.

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.

Signal and 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

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.

Figure 1: DSCA34 Block Diagram

194

For information call 800-444-7644

High Performance Signal Conditioners

• Interfaces to 100

• Linearizes RTD 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

• ±0.025% Conformity

• Easily Mounts on Standard DIN Rail

• C-UL-US Listed

• CE and ATEX Compliant

Nickel RTDs

0-20mA, or 4-20mA

Features

Ω

Platinum or 120

Ω

DSCA

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dsca34-05 Summary of contents

Page 1

... DSCA34 Linearized 2- or 3-Wire RTD Input Signal Conditioners Description Each DSCA34 RTD input module provides a single channel of RTD 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 ...

Page 2

... DSCA34-03 8mA (V ), 30mA (I ) OUT OUT Continuous DSCA34-04 ANSI/IEEE C37.90.1 1500Vrms max DSCA34-05 ANSI/IEEE C37.90.1 50VDC max 120Ω Ω Ω Ω Ω 160dB DSCA34N-01 See Ordering Information ±0.025% (100Ω Pt) ±0.07% (120Ω Ni) ±3% zero and span † ...

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