Impulse DSCP20 User Manual

DSCP20

Programmable 2-Wire Temperature Transmitter, DIN Mount

Description

Each DSCP20 2-wire transmitter is designed for measuring temperature using

thermocouples or RTDs. The input type, measurement range, and other

features are software configurable. A PC, the DSCX-887 and DSCX-416

interface cables, and the DSCX-895 configuration software are required to

configure the transmitter. Communication is serial RS-232C.

The DSCP20 can interface to 12 industry standard thermocouple types: J, K,

T, E, R, S, B, N, L, U, C, and D. Cold junction compensation is selectable as

either internal or external. Three RTD types, Pt 100, Ni 100, and Cu 50* can

be interfaced in a two, three or four wire connection. All inputs are linearized

using up to 23 points of interpolation, and total errors are less than ±0.2%.

Other configurable features include: zero point and input range adjustment,

output response for open or short-circuit sensor or cable failure, normal or

inverted output, ripple suppression for 50Hz or 60Hz, and output time response.

The DSCX-895 configuration software allows query, print-out and saving of

configuration settings, display of input measurement value, and display of

interpolation table points.

*Call factory for Cu RTD information.

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Features

 Low-Cost Non-Isolated 4-20mA Transmitter

 No Power Supply Required, Powered

 Interfaces to All Standard Thermocouples

 Software Configurable Input Type and Range

 Open and Short-Circuit Input Detection

 Configurable with or without Output Loop

 Mounts on Standard DIN Rail

 -25°C to +80°C Operating Temperature

 CE Compliant

Configurable Transmitters

from Output Loop Current

and RTDs

Power Connected

DSCP

(see Electrical

Connections

on page 182 for

connection details)

Figure 1: DSCP20 Block Diagram

178

Thermocouple Type and Material

Type Material

B Pt30Rh-Pt6Rh E NiCr-CuNi

J Fe-CuNi K NiCr-Ni L Fe-CuNi N NiCrSi-NiSi R Pt13Rh-Pt S Pt10Rh-Pt

T Cu-CuNi U Cu-CuNi C W5 Re/W26 Re D W3 Re/W25 Re

For information call 800-444-7644

Configurable Transmitters

DSCP

Specifications

Typical at TA=+25°C, 24V loop supply voltage, R

PT100, 3 wire, 0-600°C

=250Ω;

Module DSCP20

Input Range, Thermocouple Reference Table 1

Thermocouple Types:

B,E,J,K,N,R,S,T,L,U,C,D

Cold Junction Compensation

Internal Incorporated Pt 100

External 0 to 60°C, Configurable

Input Resistance >10MΩ

Input Range, RTD Reference Table 1

RTD Types: Pt 100, Ni 100

RTD Excitation Current ≤0.20mA Input Resistance >10MΩ Lead Resistance ≤30Ω per Lead

Output Range 4 to 20mA or Inverse 20 to 4mA

Output Noise <1% p-p

Loop Supply Voltage 12 to 30 VDC

Reverse Supply Protection Continuous

Load Resistance See Note 1

Output Response for Input Configurable to hold value of output

Failure immediately prior to input failure, or

Output Time Response Configurable, see Table 2

(2)

Accuracy

Linearity ±0.03% Span Typ., ±0.1% Span max.

Stability ≤±(0.015%+0.015°C)/°C

Environmental

Operating Temp. Range -25°C to +80°C

Storage Temp. Range -40°C to +80°C

Relative Humidity 0 to 75% Noncondensing

Emissions EN50081-2 (Radiated, Conducted)

Immunity EN50082-2 (ESD, RF, EFT)

Mechanical Dimensions 2.44 x 0.67 x 2.56

(h)(w)(d) (62mm x 17mm x 65mm)

Housing Material Polyamide, Flammability Class V2

Mounting DIN EN 50022-35x7.5 or EN 50035-G32

NOTES:

(1): Load Resistance: R

(max) = Loop Supply (V)  12V

OUTPUT

(max)

value between 4 and 21.6mA

±0.1% Span Typ., ±0.2% Span max.

According to UL 94

Ordering Information

Model Input Range/Description Output Range

DSCP20 Configurable RTD or Thermocouple, 4 to 20mA,

(Basic Configuration)

DSCP20-xxxx Configurable RTD or Thermocouple, 4 to 20mA,

(Contact Factory)

Accessories

Model Description

DSCX-887 PC Interface Cable

DSCX-416 Module Interface Cable

DSCX-895 Configuration Software

Table 1

Measured Variables Measuring Ranges

Limits Min. Max.

Span Span

RTD: 2, 3, or 4-wire

Pt 100, Standard IEC 60 751 -200 to +850°C 50°C 850°C

Ni 100, Standard DIN 43 760 -60 to +250°C 50°C 250°C

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Thermocouple

Type B, E, J, K, N, R, S, T;

Standard IEC 60 584-1

Type L and U; According to type 2mV

Standard DIN 43 710

Type C: W5 Re/W26 Re,

Type D: W3 Re/W25 Re;

Standard ASTM E 988-90

Table 2: Output Response Times

Measuring Open Short- Possible Response Times [s]

Mode Sensor Circuit

TC int. comp. active  1.5 2.5 3.5 6.5 11 20.5 40

TC int. comp. off  1.5 2.5 3.5 6.5 13.5 24.5 49.5

TC ext. comp. active  1.5 2.5 3.5 6.5 11 20.5 40

TC ext. comp. off  1.5 2.5 4 6.5 13.5 24.5 48.5

RTD 2L active  2 2.5 3 5 9.5 17.5 33.5

RTD 3L, 4L active active 2 2.5 4 6.5 11.5 21 40.5

RTD 2L, 3L, 4L off off 1.5 2.5 3.5 7.5 14 26.5 50.5

(4)

Circuit

(3)

User Programmed or Inverted

Factory Programmed or Inverted

(5)

80mV

(5)

DSCP

(2) Includes hysteresis, conformity and repeatability at reference conditions. Does not include CJC error.

(3) Shipped as PT 100 for 3-wire connection, 0 to 600°C range, 4 to 20mA output, open circuit detect =

21.6mA output.

(4) Submit configuration form shown on page 180, and factory will assign part number prior to order

entry.

(5) Many different ranges may be programmed as long as the min/max limits are observed. For minimum

range examples, a K type thermocouple could be programmed for +30°C to +78.5°C, or +100°C to

+149°C, or +900°C to 995°C, and so on.

Visit our website www.dataforth.com

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Additional Errors

Low Measuring Range

Resistance Thermometer

(<200°C Span) ±0.015% Span Typ., ±0.05% Span max

Thermocouples (<500°C Span) ±0.015% Span Typ., ±0.05% Span max

High Initial Value Factor: ±0.0002 Typ., ±0.0005 max

Error: (Factor)*(Initial Value/Span)*100 [%]

Influence of Lead Resistance ±0.01% per Ω

Internal Cold Junction Compensation ±( 0.5°C/Span)*(100) [%]

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