DSCA34 RTD 2- or 3-Wire Input Modules

SKU: DSCA34
Category: Signal Conditioning
Manufacturers: Dataforth

Interfaces to 100 Ohm Platinum or 120 Ohm Nickel RTDs
Linearizes RTD Signal
Industry Standard Output of either 0-10V, 0-20mA, or 4-20mA
1500Vrms Transformer Isolation
ATEX Compliant

Input Range
Output Range

from

280,80 €

excl. 19% VAT , plus

From	Unit price
5	299,52 €*
10	287,04 €*
20	280,80 €*

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Description
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Interfaces to 100 Ohm Platinum or 120 Ohm Nickel RTDs
Linearizes RTD Signal
Industry Standard Output of either 0-10V, 0-20mA, or 4-20mA
Wide Range of Supply Voltage
160dB CMR
85dB NMR at 60Hz, 80dB at 50Hz
±0.08% Accuracy
±0.025% Conformity
ATEX Compliant

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.

The 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. The 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 powerline 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.

Item information	Value
Output Type:	Analog
Module series:	DSCA Series
Input Type:	PT100/1000/RTD

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