Yokogawa 415 Steam and Gas - Manual (Page 69)

6.2 ANALOG INPUTS
The Flow Computer can be supplied as:
* Model 415R Direct 4 wire Platinum RTD (PT100) for temperature
* Model 415A 4-20mA input for temperature.
Both versions have a 4-20mA pressure input.
THE RTD INPUT
Four wire RTD measurement is the most accurate form of measurement and can
be used for measurements with the RTD up to 100 meters from the instrument. It
is recommended to use shielded cable when interfacing to RTD's.
Two or three wire RTD's can be used in place of 4 wire RTD's, but 4 wires must
be taken to the RTD and the signal and current wires joined as close to the RTD
as possible.
With direct RTD measurement, the program automatically corrects for the
non-linearity in the RTD.
Input Circuits 67
MODEL 415R
Signal (+)
4
14
5
6
2
Shield
Twisted Pair
Cable
RT D
Temperature Sensor
I (+)
I (-)
Signal (-)