Omron K3FP Series - Page 29

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
RL1
1
2
3
4
Inputs
RL1
RL3
RL2
1
2
3
4
Inputs
RL1
RL4
RL3
RL2