Thermo Fisher Scientific Alpha pH 500 - Manual (Page 8)

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2.2.2 To connect temperature probe:
For Automatic Temperature Compensated (ATC) pH readings, a 100  Pt RTD
temperature probes can be used. Industrial pH electrodes are often offered with
ATC, which will typically be bare wires.
3-wire probe
1. Insert Pt 100 sense wire to pin 5 of connector. Tighten screw.
2. Insert Pt 100 input wire to pin 6 of connector. Tighten screw.
3. Insert Pt 100 return wire to pin 7 of connector. Tighten screw.
2-wire probe:
1. Take a small length of wire and short pins 5 and 6 of connector. Insert Pt
100 sense wire into pin 6 of connector and tighten screws.
2. Insert Pt 100 return wire to pin 7 of connector. Tighten screw.
IMPORTANT: Temperature probe should always be together with pH probe,
even during calibration. Make sure no bare wires are exposed and all screws
are tightened for proper contact.
2.2.3 To connect Potential Matching Pin (Liquid electrical interferences):
Connect the additional wire from the electrode to pin 8. Transmitter must be
configured to „Symmetrical mode of operation‟ - Please refer to „Advanced Setup
Functions‟, Section 6.6.2 – Selecting Asymmetrical or Symmetrical Mode of
Operation.