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DSCT-Voltage In

DSCT-Voltage In

Analog Voltage Input Transmitters (DSCT30/DSCT31)

Each DSCT30 and DSCT31 voltage input transmitter provides a single channel of analog input which is filtered, isolated, amplified, and converted to a process current output. Signal filtering is accomplished with a five-pole filter, which provides 85 dB of normal-mode rejection at 60 Hz and 80 dB at 50 Hz. An anti-aliasing pole is located on the field side of the isolation barrier, and the other four are on the process loop 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.
Special input and output circuits on the DSCT30 and DSCT31 transmitters provide protection against accidental connection of power-line voltages up to 240 VAC and against transient events as defined by ANSI/IEEE C37.90.1. Signal and loop 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 ± 10% 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.

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Specifications

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  • Input: mV- or V-Signal
  • Output: 4-20 mA
  • Bandwidth 3 Hz
  • Isolation 1500 Vrms
  • In- and Output protection 240 Vrms
  • Input Resistance 50 MOhm / 2 MOhm
  • Accuracy ± 0.03%
  • Linearity ± 0.01%
  • ANSI/IEEE C37.90.1 Input protection
  • CMR 160dB
  • True 3-way isolation
  • NMR: 85/80dB at 60/50Hz
  • Adjustability of +/-10 % Zero and span
  • Operating Temperature Range -40°C … +80°C
  • 5-pol. Filtering
  • Dimensions 75 x 22.5 x 105 mm
  • DIN Rail Mounting
  • CE Compliant
  • Loop Supply Voltage 10.8 to 60 V
  • Special Solutions on request