Spectrum Controls 1794sc-IF8IU - 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