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3.3
Wiring
Caution: Ensure electrical mains are disconnected before proceeding.
1. Connect the power supply to the three-pin terminal block (A)
•
VAC protective ground wire = 3
•
VAC neutral wire = 2
•
VAC live wire = 1
The
α
lpha pH 190 controller accepts voltages from 85 to 260 VAC, 50/60 Hz or
DC.
2. Connect the Pt 100 leads to terminals 13 and 15 (terminal block C). Either wire
can be connected to either terminal. Terminals 13 and 14 must be shunted
unless using a 3-wire RTD.
NOTE: pH 190 is factory set for manual temperature compensation. ATC can be
selected in Setup mode of Program P3.3.
3. Slide the BNC connector of the pH (ORP) probe to the BNC connector on the
back of the controller.
Turn the notches of the connector until they lock into place.
4. Power on the controller. The display automatically shows the pH (ORP) reading,
and the pH (ORP) annunciator lights.
NOTE: In the event Pt 100 is not connected or the connection is broken in the ATC
mode, the pH/ORP display flashes to alert you.
