Thermo Fisher Scientific Alpha pH 550 - Manual (Page 10)

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2.3.2 Switching Between PT100 & PT1000 Temperature Sensors
The Monitor supports both Pt100 & Pt1000 (2-wire or 3-wire) temperature sensors.
The default factory setting is Pt100. If you need to use Pt1000 temperature sensor,
you have to change the jumper setting (J7) as described below.
Remove Back Cover:
Remove screws from the four corners at the back of the pH Controller. Remove the
back cover.
Remove Back PCBA:
Remove the screw located center of the back PCBA (Figure 1). Detach the back
PCBA from the Controller. Turn over the back PCBA. Locate J7 jumper on the inner
side of the back PCBA as shown in
Figure 2 below.
Figure 2: Inner Side of Back PCBA
Set Jumper J7:
Set the J7 jumper to required sensor (Pt100 or Pt1000) type