Impulse DSCA47 User Manual

DSCA47

Linearized Thermocouple Input Signal Conditioners

Description

Each DSCA47 thermocouple input module provides a single channel of thermocouple

input which is filtered, isolated, amplified, linearized, and converted to a high level

voltage output. 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 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.

The DSCA47 can interface to eight industry standard thermocouple types: J, K, T, E,

R, S, B and N. Each module has cold junction compensation to correct for parasitic

thermocouples formed by the thermocouple wire and input screw terminals on the

module. Upscale open thermocouple detection is provided by internal circuitry.

Downscale indication can be implemented by installing a 47MΩ, ±20% resistor

between screw terminals 6 and 8 on the input terminal block.

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. 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 ±3% 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

 Interfaces to Types J, K, T, E, R, S, B, and N

Thermocouples

 Linearizes Thermocouple Signal

 Industry Standard Output of either 0-10V,

0-20mA, or 4-20mA

 1500Vrms Transformer Isolation

 ANSI/IEEE C37.90.1 Transient Protection

 Input Protected to 240VAC Continuous

 True 3-Way Isolation

 Wide Range of Supply Voltage

 160dB CMR

 85dB NMR at 60Hz, 80dB at 50Hz

 ±0.08% Accuracy

 Easily Mounts on Standard DIN Rail

 C-UL-US Listed

 CE and ATEX Compliant

DSCA

Figure 1: DSCA47 Block Diagram

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For information call 800-444-7644

High Performance Signal Conditioners

DSCA

Specifications

Module

Input Range Standard thermocouple temperature

Input Bias Current -30nA

Input Resistance

Normal 50MΩ Power Off 65kΩ Overload 65kΩ

Input Protection

Continuous 240Vrms max

Transient ANSI/IEEE C37.90.1

Cold Junction Compensation

Accuracy, +5°C to +45°C ±0.5°C

Accuracy, -40°C to +85°C ±1.25°C

Output Range See Ordering Information

Load Resistance (I

Current Limit 8mA (V

Output Protection

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) 160dB

Accuracy See Ordering Information Below

Adjustability ±3% Zero and Span

Stability

Input Offset ±0.5µV/°C

Output Offset ±6ppm/°C (V

Gain ±40ppm/°C

Output Noise, 100kHz Bandwidth 250µVrms (V

Bandwidth, 3dB 3Hz

NMR 95dB at 60Hz, 85dB at 50Hz

Response Time, 90% Span 165ms

Open Input Response Upscale

Open Input Detection Time <5s

Power Supply

Voltage 15 to 30VDC

Current 25mA (V

Sensitivity ±0.0001%/%

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

NOTES:

(1) Includes conformity, hysteresis, repeatability and CJC error.

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.

Typical at TA=+25°C and +24V supply voltage

DSCA47

limits as per NIST monograph

175, ITS-90

) 600Ω

OUT

or -35x15 rail

), 30mA (I

OUT

), ±20ppm/°C (I

OUT

), 1µArms (I

OUT

), 55mA (I

OUT

)

OUT

)

OUT

)

Ordering Information

Model Input Range

Type



DSCA47J-01 J 0°C to +760°C 2, 3, 4 ±0.08% ±0.61°C

(+32°F to +1400°F)

DSCA47J-02 J -100°C to +300°C 2, 3, 4 ±0.08% ±0.32

(-148°F to +572°F)

DSCA47J-03 J 0°C to +500°C 2, 3, 4 ±0.07% ±0.35

(+32°F to +932°F)

DSCA47K-04 K 0°C to +1000°C 2, 3, 4 ±0.08% ±0.80

(+32°F to +1832°F)

DSCA47K-05 K 0°C to +500°C 2, 3, 4 ±0.08% ±0.40

(+32°F to +932°F)

DSCA47K-13 K -100°C to +1350°C 2, 3, 4 ±0.08% ±1.16

(-148°F to +2462°F)

DSCA47K-14 K 0°C to +1200°C 2, 3, 4 ±0.08% ±0.96

(+32°F to +2192°F)

DSCA47T-06 T -100°C to +400°C 2, 3, 4 ±0.16% ±0.80

(-148°F to +752°F)

DSCA47T-07 T 0°C to +200°C 2, 3, 4 ±0.13% ±0.26

(+32°F to +392°F)

DSCA47E-08 E 0°C to +1000°C 2, 3, 4 ±0.10% ±1.00

(+32°F to +1832°F)

DSCA47R-09 R +500°C to +1750°C 2, 3, 4 ±0.10% ±1.25

(+932°F to +3182°F)

DSCA47S-10 S +500°C to +1750°C 2, 3, 4 ±0.10% ±1.25

(+932°F to +3182°F)

DSCA47B-11 B +500°C to +1800°C 2, 3, 4 ±0.15% ±1.95

(+932°F to +3272°F)

DSCA47N-15 N -100°C to +1300°C 2, 3, 4 ±0.08% ±1.12

(-148°F to +2372°F)







Output Ranges Available

Output Range Part No. Suffix Example

1. -10V to +10V NONE N/A

2. 0V to +10V NONE DSCA47J-01

3. 4 to 20mA C DSCA47J-01C

4. 0 to 20mA E DSCA47J-01E



Thermocouple Alloy Combinations

Standards: DIN IEC 584, ANSI MC96-1-82, JIS C 1602-1981

Type Material

J Iron vs. Copper-Nickel K Nickel-Chromium vs. Nickel-Aluminum T Copper vs. Copper-Nickel E Nickel-Chromium vs. Copper-Nickel R Platinum-13% Rhodium vs. Platinum S Platinum-10% Rhodium vs. Platinum B Platinum-30% Rhodium vs. Platinum-6% Rhodium N Nickel-14.2% Chromium-1.4% Silicon vs. Nickel-4.4%

Silicon- 0.1% Magnesium

Output

Range



Accuracy

°C

DSCA

°C

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