Spectrum Controls 1794sc-IF8IU User Manual
Page 48
A-2
Flex™ IO Isolated Universal Input Module
User's Manual Pub. 0300231‐01 Rev. A
Data format
Engineering Units X1
Engineering Units X10
Raw/Proportional Counts
Scaled for PID
Percent of full scale
Input Impedance
>1 M ohms 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
7.25 W max @ 31.2V dc
Thermal dissipation
Max 10.2 BTU/hr @ 31.2V dc
Keyswitch position
3
Module Accuracy
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