352 Properties of the Modules
imc CANSAS Users Manual - Doc. Version 1.9 - 05.12.2014© 2014 imc Meßsysteme GmbH
6.16.4 Sensors
The pressure module is equipped with high-performance sensor which enable precise pressure
measurement. Each sensor is calibrated individually by means of a characteristic curve array over the
entire temperature range. Thus the typical non-linear behavior of pressure sensors is compensated.
A little EPROM on each pressure sensor records its characteristic data (incl. its characteristic curve array).
The sensor and EPROM are to be seen as an inseparable unit which complies with the standard IEEE1451.
This means that the module is especially servicing-friendly. The sensor's characteristic data can be
queried via the operating software.
The sensors are rather robust and can withstand pressures higher than the input range; refer to the spec
sheet for details on limit values. The pressure must not exceed the indicated limits, otherwise the
membrane may sustain permanent damage.
Note also in this context that there is a minimum pressure for absolute pressure sensors. Even though
the input range is generally given as starting at 0bar (e.g. 0...10bar), the pressure may not fall below the
minimum stated in the spec sheet. The sensors are not designed for measurement in near-vacuum
conditions. Violating the sensor's minimum pressure requirement can also lead to permanent damage.
The sensor is designed for a particular temperature range which must also not be violated; see the spec
sheet. The spec sheet also specifies a maximum temperature for the medium measured. The medium
may, indeed, (occasionally) be hotter than the sensor, but if the sensor gets too hot, its accuracy is
diminished. In particular, the characteristic curve array for correction of the temperature-dependency is
gauged for 85°C.
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