Install guide, Specifications – Spectrum Controls 1794sc-IRT8I User Manual

Page 3

Install Guide

Publication 0100153‐01 Rev. A (1794sc‐IRT8I) December 2008

Specifications

Number of inputs

8 channels

Module Location

Cat. No. 1794-TB3G, 1794-TB3GS
Terminal Base Units

Nominal input voltage ranges

±50 mV, ±100 mV

Supported thermocouple types

Type °C Range °F Range

300…1820 °C (572…3308 °F)

0…2315 °C (32…4199 °F)

-270…1000 °C (-454…1832 °F)

-210…1200 °C (-346…2192 °F)

-270…1370 °C (-454…2498 °F)

-210…1300 °C (-346…2372 °F)

0…1768 °C (32…3214 °F)

-270…400 °C (-454…752 °F)

Supported RTD/Resistance types

RTD

100 Ω Pt α = 0.385
-200…850 °C (-328…1562 °F)
200 Ω Pt α = 0.385
-200…850 °C (-328…1562 °F)
500 Ω Pt α = 0.385
-200…850 °C (-328…1562 °F)
1000 Ω Pt α = 0.385
-200…850 °C (-328…1562 °F)
100 Ω Pt α = 0.392
-200…630 °C (-328…1166 °F)
200 Ω Pt α = 0.392
-200…630 °C (-328…1166 °F)
500 Ω Pt α = 0.392
-200…630 °C (-328…1166 °F)
1000 Ω Pt α = 0.392
-200…630 °C (-328…1166 °F)
10 Ω Cu α = 0.426
-100…260 °C (-148…500 °F)
100 Ω Ni α = 0.618
-100…260 °C (-148…500 °F)
120 Ω Ni α = 0.672
-80…260 °C (-112…500 °F)
604 Ω NiFe α = 0.518
-100…200 °C (-148…392 °F)

Resistance

0…150 Ω
0…1000 Ω
0…3000 Ω

Resolution 16

bits

Data format

Engineering Units X1
Engineering Units X10
Raw/Proportional Counts
Scaled for PID
Percent of full scale

Input Impedance

>1 M Ω for voltage, thermocouple, RTD and
resistance inputs
249Ω +/- 1% for current inputs

Common mode rejection

60 db @ 5V peak-to-peak, 50…60 Hz

Isolation voltage (continuous voltage
withstand rating)

User power to Backplane:24 VDC continuous
Channel to Backplane: 24 VDC continuous
Channel to Channel: 24 VDC continuous.
Channel to User power: 24 VDC continuous

Open circuit protection

Open circuit detection bias <1 uA with
ON/OFF capability

Overvoltage capability

Voltage mode ± 24 VDC continuous (ten
minutes)
Current mode ± 7.8 VDC continuous (ten
minutes)

Cold junction compensation Range

-20…100 °C

Cold junction compensator

A-B catalog number 1794-CJC2

Flexbus current

80 mA

Power dissipation

6.28 W max @ 31.2V dc

Thermal dissipation

Max 10.2 BTU/hr @ 31.2V dc

Keyswitch position

Accuracy Specifications

Thermocouple Accuracy
with 4.17 Hz filter
using Linearization per ITS-90

Accuracy
Limit At 25°C
4.17 Hz Filter

Accuracy
Limit At 0-
55°C
4.17 Hz Filter

Repeatability
Limit
At 25°C &
4.17 Hz filter

Type J (-50˚C to 1200˚C):

± 0.6 °C

± 2.3 °C

± 0.17 °C

Type J (-210˚C to -50˚C):

± 0.8 °C

± 3.3 °C

± 0.25 °C

Type N (-80˚C to 1300˚C):

± 1.0 °C

± 1.5 °C

± 0.3 °C

Type N (-250˚C to -80˚C):

± 1.2 °C

± 3.0 °C

± 1.9 °C

Type T (-180˚C to 400˚C):

± 1.0 °C

± 1.5 °C

± 0.2 °C

Type T (-270˚C to -180˚C):

± 5.4 °C

± 8.5 °C

± 1.5 °C

Type K (-180˚C to 1370˚C):

± 1.0 °C

± 1.5°C

± 0.3 °C

Type K (-270˚C to -180˚C):

± 7.5 °C

± 11.5 °C

± 3.6 °C

Type E (-130˚C to 1000˚C):

± 0.5 °C

± 1.5 °C

± 0.1°C

Type E (-270˚C to -130˚C):

± 4.2 °C

± 7.3 °C

± 1.2 °C

Type C (0˚C to 2315˚C):

± 1.8 °C

± 3.5 °C

± 0.9 °C

Type B (600˚C to 1800˚C):

± 3.0 °C

± 4.0 °C

± 1°C

Type B (300˚C to 600˚C):

± 3.0 °C

± 8.0 °C

± 2°C

Type S (140˚C to -1760˚C):

± 1.7 °C

± 2.6 °C

± 0.55 °C

Type S (0˚C to 140˚C):

± 1.7 °C

± 5.0 °C

± 1.0 °C

Type R (280˚C to -1760˚C):

± 1.7 °C

± 2.6 °C

± 0.4 °C

Type R (0˚C to 280˚C):

± 1.7 °C

± 5.0 °C

± 1.0 °C

CJC accuracy

± 1.0 °C

3.0 °C

± 0.8 °C

Resistance Accuracy
with 4.17 Hz filter

Accuracy
Limit At °25C

Accuracy
Limit At 0-
°55C

Repeatability
Limit
At °25C &
4.17 Hz filter

0-150 ohms range

±0.15 ohms

±0.25 ohms

±10 milliohms

0-1000 ohms range

±1.0 ohms

±2.0 ohms

±100
milliohms

0-3000 ohms range

±1.5 ohms

±2.5 ohms

±100
milliohms

RTD Accuracy
With 4.17 Hz filters

Accuracy °C
Limit At °25C

Accuracy °C
Limit At
0°55C

Repeatability
Limit
At °25C &
4.17 Hz filter

Platinum 385 (100, 200, 500 and
1000 ohms) (IEC751 1983, Amend
2 1995; JISC 1604 1997)

± 0.7 °C

± 1.2 °C

± 0.1 °C

Platinum 3916 (100, 200, 500 and
1000 ohms) (JISC 1604: 1981)

± 0.6 °C

± 1.1 °C

± 0.1 °C

Nickel 618 (100 ohms) (DIN 43760
Sept. 1987)

± 0.3 °C

± 0.5 °C

± 0.1 °C

Nickel 672(120 ohms) (DIN 43760
Sept. 1987)

± 0.3 °C

± 0.5 °C

± 0.1 °C

Nickel-Iron (518) (MINCO
Application Aid #18,Date 5/90)

± 0.4 °C

± 0.7 °C

± 0.1 °C

Copper 426 (10 ohms) (SAMA
RC21-4-1966)

± 2.0 °C

± 2.4 °C

± 0.1 °C

General Specifications

Voltage range
Supply current

24V dc nom
240 mA @ 24V dc

Dimensions (with module installed in base)
HxWxD approx.

94 x 94 x 69 mm
(3.7 x 3.7 x 2.7 in.)

Environmental Conditions

Temperature, operating

0…55 °C (-32…131 °F)

Temperature, storage

–40…85 °C (–40…185 °F)

Relative humidity

IEC 60068-2-30 (Test Db,
Unpackaged Damp Heat):
5…95% non-condensing

Vibration

IEC60068-2-6 (Test Fc, Operating):
5 g @ 10…500Hz

Shock
Operating
Non-operating

IEC60068-2-27 (Test Ea,
Unpackaged shock):
20 g
25 g

Emissions

CISPR 11:
Group 1, Class A (with appropriate
enclosure)

ESD immunity

IEC 61000-4-2:
6 kV contact discharges
8 kV air discharges

Radiated RF immunity

IEC 61000-4-3:
10 V/m with 1 kHz sine-wave 80%
AM from 30…2000 MHz
10 V/m with 200 Hz 50% Pulse
100% AM at 900 MHz
10 V/m with 200 Hz 50% Pulse
100% AM at 1890 MHz

EFT/B immunity

IEC 61000-4-4:
±2 kV at 5 kHz on signal ports

Surge transient immunity

IEC 61000-4-5:
±2 kV line-earth (CM) on shielded
ports

Conducted RF immunity

IEC 61000-4-6:
10V rms with 1 kHz sine-wave 80%
AM from 150 kHz…80 MHz

Enclosure type rating

None (open-style)

Signal conductors
Thermocouple
Millivolt
Category

(1)

Use appropriate shielded
thermocouple wire

)

Belden 8761 2 - on signal ports

Power conductors
Wire size

Category

(1)

0.34…2.5 mm

(22…12 AWG) solid

or stranded copper wire rated
at 75 °C (167 °F) or greater
1.2 mm (3/64 in.) insulation max
3 - on power ports

Terminal screw torque for cage-clamp
terminal base

0.8 Nm (7 lb-in.)

Certifications (when product is marked)

(2)

Listed for Class I, Division 2

Group A,B,C,D Hazardous
Locations, certified for U.S. and
Canada. See UL File
E180101.
UL

Listed Industrial Control

Equipment, certified for U.S.
and Canada. See UL File E140954.
EEx

European Union 94/9/EEC

ATEX Directive, compliant with:
EN 60079-15; Potentially Explosive
Atmospheres,
Protection II 3 G nA IIC T5
CE

European Union 89/336/EEC

EMC Directive,
compliant with:
EN 61000-6-4; Industrial Emissions
EN 50082-2; Industrial Immunity
EN 61326; Meas./Control/Lab.,
Industrial Requirements
EN 61000-6-2; Industrial Immunity
EN 61131-2; Programmable
Controllers
(Clause 8, Zone A & B)

(1) Use this category information for planning conductor routing as described in Industrial Automation
Wiring and Grounding Guidelines, Allen-Bradley publication 1770-4.1.
(2) For the latest up-to-date information, see the Product Certification link at www.spectrumcontrols.com
for Declarations of Conformity, Certificates and other certification details.
(3) Refer to the thermocouple manufacturer for proper thermocouple extension.