Yokogawa 212 Heat Calculator - Manual (Page 55)

6.2 RTD INPUT
The Model 212 uses four wire RTDs to provide optimum accuracy and stability.
The RTDs are high grade 100 ohm platinum types manufactured to BS1094
standards.
It is not necessary with four wire RTDs to have equal lead lengths, but cables
should not be longer than 50 meters (150 feet). They should be shielded twisted
pairs connected as follows:
Note: Care must be taken to ensure the (+) of the current terminal is
connected to the same side of the RTD as the (+) of the input terminal.
The RTD, itself, has no polarity.
Input & Output Connections 53