20
FLEX Ex Thermocouple/RTD Input Module
Publication
1797-IN004G-EN-P - August 2017
Data Organization
Overrange Alarm
Lead Breakage Alarm
Fault State
Sensor Mode RTD 2,
3, or 4-wire,
TC Sensor Type (such as
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 °C, 20 °C, 25 °C, 30 °C, 40 °C, 50
°C, 60 °C, 70 °C selectable
Output (Intrinsically Safe)
(16 Position Male/Female
Flexbus Connector)
U
i
< 5.8V
I
i
< 400 mA
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 EN60079-11
Galvanic to DIN EN60079-11
None
Galvanic to DIN EN60079-11
Power Supply
(+V, -V Intrinsically Safe)
U
i
< 9.5V dc
I
i
< 1 A
Li = Negligible
Ci = Negligible
Module Field-side Power
Consumption
1.6 W
Power Dissipation
1.6 W
Thermal Dissipation
Max 5.46 BTU/hr
Module Location
Cat. No. 1797-TB3 or 1797-TB3S Terminal Base Unit
Conductor Wire Size
4 mm
2
(12 gauge) stranded max
1.2 mm (3/64in.) insulation max
Dimensions
Metric
Imperial
46 mm x 94 mm x 75 mm
(1.8 in. x 3.7 in. x 2.95 in.)
Weight
200 g (approximate)
Keyswitch Position
2
Specifications continued on next page
Summary of Contents for FLEX Ex 1797-IRT8
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