RTD Transducer
K3FP-RS-UI
29
Precautions
Refer to pages 38 and 39 for common precautions.
■
Precautions for Correct Use
Diagnostics Indicator
The diagnostics indicator (LED) inside the translucent cover shows
the error status, as outlined in the following table.
Connections
2-conductor Connection
•
For short distances (less than 10 m)
•
Cable resistances R
L1
and R
L2
are incorporated in the
measurement result directly and falsify the result accordingly.
3-conductor Connection
•
For long distances between PT100 platinum resistance
thermometers and K3FP-RS-UI RTD Transducers.
•
The value of all cable resistances must be exactly the same to
balance out the PT100 platinum resistance thermometer cable
resistances (R
L1
= R
L2
= R
L3
).
4-conductor Connections
•
For long distances between the PT100 platinum resistance
thermometer and the K3FP-RS-UI and different cable resistances
(R
L1
≠
R
L2
≠
R
L3
≠
R
L4
).
Indicator status
Error details
Flashing
Measuring range span less than 50 K
Lit
Disconnection on the platinum resistance
thermometer side
Short circuit on the platinum resistance
thermometer side
Above measurement range
Below measurement range
1
2
Inputs
3
4
R
L2
R
L1
1
2
3
4
Inputs
R
L1
R
L3
R
L2
1
2
3
4
Inputs
R
L1
R
L4
R
L3
R
L2
