Yokogawa 415 Steam and Gas - Manual (Page 41)

4. OPTIONS
4.1 THE 4-20mA OUTPUT OPTION
The 4-20mA output option provides an analog output of the Default flowrate as
either a 4-20mA current or a 0-10 Volt level. The output will be the corrected
volume, mass or energy, depending on which parameter is programmed as the
default displayed. All output signals are electrically isolated from the instrument
power supply and signal inputs to ensure minimum interference.
Either 2 wire current transmission is available with the loop powered internally,
or 3 wire transmission from an external loop supply.
A block diagram of the output is shown below and various methods of
interconnection are outlined on the following pages.
Options 39
DC to DC
Convertor
Digital to
Analog
Convertor
Opto-Isolation Amplifiers
0V
-12V
21
23
Terminal
26
25
+15V
24
0-10V Out
22