YOKOGAWA ROTAMASS Total Insight, Руководство пользователя

Страница: 59 / 76

Wiring
Quick Reference Instruction Manual for Spare
Transmitter replacement
IM01U10A01-00EN-R, 1
st
edition, 2019-12-09 59 / 76
Balanced Pair
Master
Pull Up
Pull Down
LT: Line Termination
Common
Slave n ROTAMASS
Fig. 31: Modbus connection
Output signals
Galvanic isolation All circuits for inputs, outputs and power supply are galvanically isolated from each other.
Active current
output
lout
One or two current outputs are available depending on model code position 13.
Depending on the measured value, the active current output delivers 4 – 20 mA.
It may be used for output of the following measured values:
▪ Flow rate (mass, volume, net partial component flow of a mixture)
▪ Density
▪ Temperature
▪ Pressure
▪ Concentration
For HART communication devices, it is supplied on the current output lout1 . The current
output may be operated in compliance with the NAMUR NE43 standard.
Value
Nominal output current 4 – 20 mA
Maximum output current range 2.4 – 21.6 mA
Load resistance ≤ 750 Ω
Load resistance for secure HART communication 230 – 600 Ω
Iout+
Iout-
ROTAMASS
1
Fig. 32: Active current output connection lout HART
① Receiver