40 Using the device
AUTOMATIC ZERO POINT CORRECTION
OF PRESSURE SENSOR
Automatic zero point correction ensures the uniformly
high precision of the pressure measurements and takes
account of aging effects. Therefore the electric and
electronic components are maintenance-free.
Sensors are normally temperature-compensated before
being installed in CPAP devices. This process requires
certain compensation tools, which are used solely by
trained staff. Unfortunately, the selected values are not
permanent as they vary over time due to aging, vibra-
tions or constant changes in climate. This means that
these values need to be checked for correctness at
prolonged intervals and possibly readjusted.
HOFFRICHTER‘s technicians have however developed
a new method in which the necessary compensation
tools are, so to speak, permanently „on board“ the
point 2. It is thus no longer necessary to check mea-
surement accuracy.
To allow this method to function, the point 2 has to be
put on standby from time to time. Here it is suffi cient
to run the device in this mode for just a few seconds
before and after each starting up of the blower to allow
the software to collect and apply the necessary data.
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