Impulse DSCT30, DSCT31 User Manual
DSCT30/31
Analog Voltage Input Transmitters
Description
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 (Figure 1). 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 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 trans-
mission 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
240VAC 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.
DIN Rail Mount Two-WireTransmitters
▲
Features
Accepts Millivolt and Voltage Level Signals
Process Current Output
1500Vrms Transformer Isolation
ANSI/IEEE C37.90.1 Transient Protection
Input and Output Protected to 240VAC
Continuous
Up to 60V Loop Voltage
160dB CMR
85dB NMR at 60Hz, 80dB at 50Hz
±0.03% Accuracy
±0.01% Linearity
Easily Mounts on Standard DIN Rail
CSA and FM Approvals Pending
CE Compliant
DSCT
Figure 1: DSCT30/31 Block Diagram
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For information call 800-444-7644
DIN Rail Mount Two-Wire Transmitters
DSCT
Specifications
Typical at TA = +25°C and +24V loop voltage
Model DSCT30 DSCT31
Input Range ±10mV to ±100mV ±1V to ±20V
Input Bias Current ±0.5nA ±0.05nA
Input Resistance
Normal 50MΩ 2MΩ
Power Off 66kΩ 2MΩ
Overload 66kΩ 2MΩ
Input Protection
Continuous 240Vrms max *
Transient ANSI/IEEE C37.90.1 *
CMV, Input to Output
Continuous 1500Vrms max *
Transient ANSI/IEEE C37.90.1 *
CMR (50Hz or 60Hz) 160dB *
NMR 85dB at 60Hz, 80dB at 50Hz *
Adjustability ±10% Zero and Span *
Accuracy
Conformity ±0.01% *
Stability
Noise
Bandwidth, 3dB 3Hz *
Response Time, 90% Span 165ms *
Output Range 4mA to 20mA *
Output Limits
Output Protection
Loop Supply Voltage 10.8V to 60V *
Loop Supply Sensitivity ±0.0005%/V *
Turn-On Delay 400ms *
(1)
Offset ±20ppm/°C *
Gain ±80ppm/°C *
Output, 100kHz 3µArms *
Under-range 2.8mA *
Over-range 29mA *
Reverse Polarity Continuous *
Over-voltage 240Vrms continuous *
Transient ANSI/IEEE C37.90.1 *
±0.03% *
Ordering Information
Model Input Range
DSCT30-01 ±10mV
DSCT30-02 ±50mV
DSCT30-03 ±100mV
DSCT30-04 0 - 10mV
DSCT30-05 0 - 50mV
DSCT30-06 0 - 100mV
DSCT31-01 ±1V
DSCT31-02 ±5V
DSCT31-03 ±10V
DSCT31-04 0 - 1V
DSCT31-05 0 - 5V
DSCT31-06 0 - 10V
DSCT31-07 ±20V
DSCT31-08 0 - 20V
Environmental
Operating Temp. Range 40°C to +80°C *
Storage Temp. Range 40°C to +80°C *
Relative Humidity 0 to 95% Noncondensing *
Emissions EN50081-1, ISM Group 1, *
Class A (Radiated, Conducted)
Immunity EN50082-1, ISM Group 1, *
Class A (ESD, RF, EFT)
Mechanical Dimensions 2.95" x 0.89" x 4.13 *
(h)(w)(d) (75mm x 22.5mm x 105mm) *
Mounting DIN EN 50022 35x7.5 or 35x15 rail *
NOTES:
* Same specification as DSCT30.
(1) Includes nonlinearity, hysteresis and repeatability.
DSCT
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