Presys PC-507-IS Technical Manual page 24

The contact input (SW) is used to measure the continuity of an external
contact connected to calibrator V IN and mA OUT (+) terminals. When there is
continuity the input indicates CLOSED; otherwise, OPEN is indicated.
c) Probe Connection
Probe is an input for temperature measurement with an optional 4-wire Pt-100
probe. When using the Probe, temperature ranging from -200.00 °C to 850.00 °C can
be measured with high accuracy.
When Probe input sensor breaking occurs, the display shows the burn-out
warning identified by the symbol illustrated below:
Connect the probe to the calibrator so that polarity identifications (white mark)
match. In the figure below are the probe connections:
PROB = ????.?? °C
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