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DSCA33

True RMS Input Signal Conditioners

Each DSCA33 True RMS input module provides a single channel of AC input which is converted to its True RMS DC value, filtered, isolated, amplified, and converted to standard process voltage or current output.

The field voltage or current input signal is processed through an AC coupled pre-amplifier and RMS converter on the field side of the isolation barrier. The converted dc signal is then filtered and chopped by a proprietary chopper circuit and transferred across the transformer isolation barrier, suppressing transmission of common mode spikes and surges. The computer side circuitry reconstructs, filters and converts the signal to industry standard outputs.

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 480 VAC 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 pluggable terminal blocks for ease of system assembly and reconfiguration.

DSCA33 modules have excellent stability over time and do not require recalibration, however, both zero and span settings are adjustable to accom-modate 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.

Due to circuit limitations, DSCA33-04x and -05x are not ATEX compliant.

Circuit diagram Dataforth DSCA33

Block Diagram DSCA33



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7 Modules for Type DSCA33:

ModuleInputDescription
DSCA33-01 0 V to +100 mV DSCA33 Isolated True RMS Input Signal Conditioner with Voltage- and Current-Input and Voltage- or Current-Output
DSCA33-02 0 V to +1 V DSCA33 Isolated True RMS Input Signal Conditioner with Voltage- and Current-Input and Voltage- or Current-Output
DSCA33-03 0 V to +10 V DSCA33 Isolated True RMS Input Signal Conditioner with Voltage- and Current-Input and Voltage- or Current-Output
DSCA33-04 0 V to +150 V DSCA33 Isolated True RMS Input Signal Conditioner with Voltage- and Current-Input and Voltage- or Current-Output
DSCA33-05 0 V to 300 V DSCA33 Isolated True RMS Input Signal Conditioner with Voltage- and Current-Input and Voltage- or Current-Output
DSCA33-06 0 A to 1 A DSCA33 Isolated True RMS Input Signal Conditioner with Voltage- and Current-Input and Voltage- or Current-Output
DSCA33-07 0 A to 5 A DSCA33 Isolated True RMS Input Signal Conditioner with Voltage- and Current-Input and Voltage- or Current-Output

Specifications

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  • Input: RMS Voltage (0 - 300V) or RMS Current (0-5A)
  • Output: 0...5V / 0...10V / 0...1mA / 0...20mA / 4...20mA
  • Standard Frequency 45 Hz to 1 kHz, extended to 20 kHz
  • Isolation 1500 Vrms
  • Input protection 350 Vrms, 5 Arms or 10 Arms
  • Input Resistance up to 499 kOhm or 0.1 Ohm or 0,025 Ohm
  • Accuracy ± 0.25%
  • Input protection up to 480V (Peak AC & DC) or 10 Arms
  • ANSI/IEEE C37.90.1 Input protection
  • CMR 100dB
  • True 3-way isolation
  • Response Time < 400 ms
  • Power Supply 19 to 29 VDC
  • Operating Temperature Range -40°C … +80°C
  • Adjustability of +/-5 % Zero and span
  • 5-pol. Filtering
  • Dimensions 75 x 22.5 x 105 mm
  • DIN Rail Mounting
  • CE and ATEX certified, C-UL-US compliant
  • Special Solutions on request