Thermo Fisher Scientific Alpha pH 190 (In the process of updating the brand guideline & product image) - Manual (Page 11)

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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 Alpha 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.