The air supply unit LV2 is used for the constant supply of commercially available oxygen probes with reference air.
A defined amount of filtered outside air is forced into the interior of the zirconium oxide tube. The low overpressure prevents the furnace atmosphere from penetrating the interior of the zirconium oxide tube.
The amount of reference air should not be selected too large, otherwise, the built-in thermocouple will be cooled unnecessarily.
As a rule, oxygen probes with a continuous zirconium oxide tube (MESA oxygen probes) require almost no reference air, so that with these probes there is no significant falsification of the temperature measurement.
