Hach EC1000 Instruction Manual page 79

Figure 23 Recommended Current Loop Hookup
Current Source
Current Source
Current Source
Current Source
*Note: The analyzer is not isolated from the current loop in this configuration.
7
6
1
5
4
Current Loop Configuration
With Analyzer Providing Current Sources*
7
6
1
5
4
79
20 mA Source
Computer or
Printer Receiver
20 mA Source
Computer
Transmitter
Computer or
Printer Receiver
Computer
Transmitter