Paul,
The Rotax cht probes are grounded, one side, the housing is ground, and the
other
side is the connector. They are of the PTCor NTC type, that is a resistor,
which changes it's resistance with temperature. Other types of probes are
thermocouples,
usually designated as "J" or "K" type probes, which produce a tiny
voltage depending on the temperature of the junction. Those can be grounded or
not. Whether you need resistive probes or "J" or "K" types probes is dependent
on the EIS and it's inputs. My Dynon D180 accepts both, but only on certain
positions.
Regards,
Jos Okhuijsen
Visit - www.EuropaOwners.org
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