Impulse DSCA32 User Manual

DSCA32

Analog Current Input Signal Conditioners

Description

Each DSCA32 current input module provides a single channel of analog input

which is filtered, isolated, amplified, and converted to a high level voltage output.

Signal filtering is accomplished with a five-pole filter which which is optimized for

step response. 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.

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 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 ±5% 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.

High Performance Signal Conditioners

▲

Features

 Accepts Milliamp Level Signals

 Industry Standard Output of either 0 to 10V,

0 to 20mA, or 4 to 20mA

 1500Vrms Transformer Isolation

 ANSI/IEEE C37.90.1 Transient Protection

 Input Protected to 240VAC Continuous

 True 3-Way Isolation

 Wide Range of Supply Voltage

 105dB CMR

 5 Poles of Filtering

 ±0.03% Accuracy

 ±0.01% Linearity

 Easily Mounts on Standard DIN Rail

 C-UL-US Listed

 CE and ATEX Compliant

DSCA

Figure 1: DSCA32 Block Diagram

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For information call 800-444-7644

High Performance Signal Conditioners

DSCA

Specifications

Module

Typical at T

=+25°C and +24V supply voltage

A

DSCA32

Input Range 0-20mA or 4-20mA

Input Resistance

Normal <100Ω
Power Off <100Ω
Overload 65kΩ

Input Protection

Continuous 240Vrms max

Transient ANSI/IEEE C37.90.1

Output Range See Ordering Information

Load Resistance (I

Current Limit 8mA (V

Output Protection

) 600Ω max

OUT

OUT

), 30mA (I

Short to Ground Continuous

Transient ANSI/IEEE C37.90.1

CMV, Input to Output, Input to Power

Continuous 1500Vrms max

Transient ANSI/IEEE C37.90.1

CMV, Output to Power

Continuous 50VDC max

CMR (50Hz or 60Hz) 105dB

(1)

Accuracy

±0.03% Span

Nonlinearity ±0.01% Span

Adjustability ±5% Zero and Span

Stability

Offset ±6ppm/°C (V

Gain ±40ppm/°C

Output Noise, 100kHz Bandwidth 300µVrms (V

), ±20ppm/°C (I

OUT

), 1.2µArms (I

OUT

Bandwidth, 3dB 100Hz

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

Response Time, 90% Span 5m s

Power Supply

Voltage 15 to 30VDC

Current 25mA (V

Sensitivity ±0.0001%/%

), 55mA (I

OUT

Protection

Reverse Polarity Continuous

Transient ANSI/IEEE C37.90.1

Environmental

Operating Temp. Range 40°C to +80°C

ATEX Group II, Category 3 20°C to +40°C

Storage Temp. Range 40°C to +80°C

Relative Humidity 0 to 95% Noncondensing

Emissions EN61000-6-4 ISM, Group 1

Radiated, Conducted Class A

Immunity EN61000-6-2 ISM, Group 1

R F Performance A ±0.05% Span Error

ESD, EFT, Surge, Voltage Dips Performance B

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.

OUT

OUT

Ordering Information

Model Input Range Output Range

DSCA32-01 4mA to 20mA 2, 3, 4

DSCA32-02 0mA to 20mA 2, 3, 4

DSCA32-03 ±20mA 1

DSCA32-04 ±20mA 2, 3, 4







Output Ranges Available

)

Output Range Part No. Suffix Example

1. -10V to +10V NONE DSCA32-03

2. 0V to +10V NONE DSCA32-01

3. 4 to 20mA C DSCA32-01C

4. 0 to 20mA E DSCA32-01E

)

OUT

)

OUT



DSCA

)

Installation Notes:

1.) This Equipment is Suitable for Use in Class I, Division 2, Groups A, B, C, D, or Non-Hazardous Locations Only.

2.) Warning - Explosion Hazard - Substitution of Components May Impair Suitability for Class I, Division 2.

3.) Warning - Explosion Hazard - Do Not Disconnect Equipment Unless Power Has Been Switched Off or The

Area is Known to be Non-Hazardous.

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