Gallium Orthophosphate GaPO4 –
Patented unique high temperature
resistant crystal material for high
durability and excellent linearity
Today GaPO4 is by far the best
suitable piezoelectric material to
be used in engine applications. It
has a combination of several unique
properties that make it the first
choice. It has unparalleled stability
up to a temperature of 970 °C with
twice the sensitivity of quartz and
performs better with respect to
sensitivity shifts if compared to
Langasite crystals. The outstanding
stability of GaPO4 gives AVL the
ability to produce pressure sensors
which show excellent measurement
behavior, even at high temperatures
and pressures. The inherent physical
rigidity of GaPO4 allows the realization
of excellent signal qualities in
very compact designs. For details
see also page 22.
Double Shell™ – Special sensor
design which decouples the crystals
mechanically from the housing for
premium signal quality
The piezoelectric elements are supposed
to measure only the pressure
changes which are caused by the
combustion process. Due to their
high sensitivity these elements are
also susceptible to any other kind
of applied pressure. For example
the mechanical stress which occurs
due to mounting the sensor into the
mounting bore of the engine can
cause a misreading of the combustion
pressure. The Double Shell™ is
a special design feature which allows
isolation of the piezoelectric measuring
elements from any of these negative
influences and helps to ensure
absolute measurement precision.
SDM Sensor Data Management –
Increasing efficiency due to
organized workflow
SDM guarantees end-to-end automated
data transfer and thus ensures
error-free measurements. This solution
covers the complete measurement
chain running from the sensor to
the post-processing software.
AVL Sensor Data Management™
SDM consists of several hardware
and software components:
• Automated sensor calibration
system AVL RCU 601/300
• Sensor and testfield data base (SDB)
• Sensoridentification (SID, SIC, SDC)
• Amplifier AVL X-ion™ and
AVL IndiCom™
For details see also page 24.
ICONS OF KEY FEATURES
Pressure Sensors
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