Thermo Fisher Scientific Alpha pH 550 - Manual (Page 12)

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2.3.4 Connecting Temperature Probe
For Automatic Temperature Compensated (ATC) pH readings, a 100
Ω Pt RTD
temperature probe (2-wire or 3-wire) can be connected to the Controller.
3-Wire Probe:
1. Connect PT100 compensate wire to Pin 5 of J10 connector
2. Connect PT100 sense wire to Pin 6 of J10 connector
3. Connect PT100 GND wire to Pin 7 of J10 connector
2-Wire Probe:
1. Short
Pin 5 & 6 of J10 connector using a small piece of wire
2. Connect PT100 sense wire to Pin 6 of J10 connector
3. Connect PT100 GND wire to Pin 7 of J10 connector
2.3.5 Connect Potential Matching Pin (PMP)
If using an electrode with a PMP, connect the additional wire (PMP) from the pH
electrode to Pin 8 of J10 connector. This liquid electrical reference wire is only used
when the pH Controller is configured to ‘Symmetrical mode of operation’. Refer
section 5.5 for details on symmetrical mode of operation.