Impulse DSCT32 User Manual

DSCT32

Analog Current Input Transmitters

Description

Each DSCT32 current 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 80dB per decade of normal-mode-rejection above 100Hz. 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 DSCT32 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

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Features

 Accepts Milliamp 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

 NMR, 80dB Per Decade Above 100Hz

 ±0.03% Accuracy

 ±0.01% Linearity

 Easily Mounts on Standard DIN Rail

 CSA and FM Approvals Pending

 CE Compliant

DSCT

Figure 1: DSCT32 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

Module DSCT32

Input Range 0-20mA or 4-20mA

Current Conversion Resistor 50.00Ω

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 (-3dB at 100Hz) 80dB/decade Above 100Hz

Adjustability ±10% Zero and Span

Accuracy

Conformity ±0.01%

Stability

Noise

Bandwidth, 3dB 100Hz

Response Time, 90% Span 5ms

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 ±30ppm/°C

Gain ±90ppm/°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

DSCT32-01 4-20mA

DSCT32-02 0-20mA

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,

Immunity EN50082-1, ISM Group 1,

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:

(1) Includes nonlinearity, hysteresis and repeatability.

Class A (Radiated, Conducted)

Class A (ESD, RF, EFT)

DSCT

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