13
3.2 Default Wiring Sensors to the Measurement Modules
NEVER apply voltage across terminals 7 & 8 on any 3-wire FX-300 transmitter
For reference the wiring for ISE sensors with and without preamplifiers is detailed below. The
top diagram “FX-300-pH/ISE” is for sensors without internal/ integrated preamplifiers
. The bottom
diagram “FX-300-pH/ISE-X” is for sensors with internal/integrated preamplifiers.
The lead pro24VDC power always goes to terminal 6 and the 4-20mA current loop output is
always sent from terminal 7. The DC common (ground) is shared as terminal 8. The current loop output
is sent from terminal 7 and return to terminal 8 (ground / DC common). The FX-300 transmitters are
always energized on terminal 6 with the DC ground of the 24VDC power supply (a.k.a. rail) always
being the (shared) terminal 8.
3 Installation
