Specifications, Appendix a, Appendix – Rockwell Automation 1797-IRT8 FLEX Ex Thermocouple/RTD/mV Input Module User Manual User Manual
Page 67
1
Publication 1797-6.5.2 - February 2001
Appendix
A
Specifications
The following specifications apply to the 1797-IRT8 thermocouple/
RTD/mV input module.
Specifications - 1797-IRT8 Thermocouple/RTD Module
Number of Inputs
8 channels
IS Input Type
EEx ia IIB/IIC T4, AEx ia IIC T4, Class I, II, III Division 1 Group
A-G T4
IS Module Type
EEx ib IIB/IIC T4, AEx ib IIC T4, Class I, Division 1 & 2 Group
A-D T4
Input Type
Suitable for Pt 100, Pt200, Ni 100, Ni120, Ni200, 10Cu RTD,
thermocouple Type B, E, J, K, N, R, S, T, TXK/XK (L)
Configuration via internal bus
Signal Input Range
0 to 500 ohms; -40 to 100mV
Settling Time to 99% of Final
Value
8ms (mV mode,
o
F thermocouple)
Open RTD Detection
Out of range upscale reading
Lead Resistance
Compensation
< 15 ohm total
Transfer Characteristics
Accuracy
Temperature Effect
RTDs: 0.1% of span @ 20
o
C, filter cutoff < 1Hz
Thermocouples: 0.1% of span @ 20
o
C,
filter cutoff < 1Hz
Cold junction compensation = +1
o
C
150ppm/
o
C (primary range)
Indicators
8 red fault indicators
1 green module power indicator
Data Organization
Overrange Alarm
Lead Breakage Alarm
Fault State
Sensor Mode RTD 2,
3, or 4-wire,
TC Sensor Type (e.g. TC,
Type B, E, J..., RTD or
mV
Internal Reference
Junction (TC mode)
Individually for each channel
Individually for each channel
Individually for each channel (includes overrange, lead
breakage and short circuit)
Common to groups of 4 channels (ch 0-3, ch 4-7)
Common to groups of 4 channels (ch 0-3, ch 4-7)
Common to all channels (0
o
C, 20
o
C, 25
o
C, 30
o
C, 40
o
C, 50
o
C,
60
o
C, 70
o
C selectable
Output (intrinsically safe)
(16 position male/female
flexbus connector)
U
i
< 5.8V
I
i
< 400mA
Li = Negligible
Ci < 1.35
µ
F
Isolation Path
Input to power supply
Input to flexbus
Input to input
Power supply to flexbus
Isolation Type
Galvanic to DIN EN50020
Galvanic to DIN EN50020
None
Galvanic to DIN EN50020
Power Supply
(+V, -V intrinsically safe)
U
i
< 9.5V dc
I
i
< 1A
Li = Negligible
Ci = Negligible
Module Field-Side Power
Consumption
1.6W
Specifications continued on next page.