Aquametrix AM-TBR Turbidimeter User Manual - Manual (Page 15)

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3.3.4. 4-20 mA
The 4-20 mA output is driven by a 15 VDC power source and can drive recorder loads up to 600
ohms. This 4-20 mA output is isolated from line power and earth ground. Do not run 4-20 mA
cables in the same conduit as power. Operation of this output is covered in section 7.2.
Note: The installation of the 4-20 mA isolator will render the RS-485 non-operational.
Ensure each instrument is not powered when connecting the 4-20 mA. To prevent damage to the
instrument, ensure that power is disconnected prior to making connections. For ease of
connecting, remove the plug in terminal block. Polarities of the connections are labeled beneath
this termination.