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Frequently Asked Questions (FAQ)
Question: What is an absolute pressure sensor?
Answer: Absolute pressure
sensors measure the applied pressure in comparison to the absolute
vacuum.
Question: What is a relative pressure sensor?
Answer: Relative pressure
sensors measure the difference between the ambient pressure and the
measuring pressure.
Question: What is a barometric pressure sensor?
Answer: Barometric pressure
sensors measure the air-pressure comparative to the vacuum.
Question: How can you measure the altitude with
the help of an absolute pressure sensor?
Answer: The geographic
altitude and the atmospheric pressure are interconnected via the
classic barometric formula. By using an absolute pressure sensor the
atmospheric pressure can be detected easily. You will find more
information about this topic in the application
note aan509.
Question: What is a differential sensor?
Answer: Differential pressure
sensors measure the difference between two measuring pressures. For
more detailed information please read the application
note: aan505.pdf.
Question: What is a bidirectional difference
sensor?
Answer: Bidirectional
Difference Pressure Sensors measure the difference between two
measuring pressures, in doing so it doesn’t matter which
pressure is higher or lower. In this way low and high-pressure can be
measured comparative to a given pressure.
Link: aan505.pdf.
Question: What is a ratiometric sensor?
Answer: A ratiometric sensor
is a sensor whose output signal changes synchronously with the changing
of the supply voltage.
Question: How do you protect silicon sensors
against liquids?
Answer: Pressure sensors with
silicon measuring cells are sensitive to liquids and a multitude of
aggressive substances. The article describes which arrangements can be
made to reduce the feared media sensitivity of relative- respectively
difference pressure sensors dramatically.
Link: Article
aan508
Question: How do you calibrate ceramic measuring
cells?
Answer: This article describes
in detail a simple electronic circuit based on a suitable IC and few
external components to amplify and to calibrate the offset- and full
span-signal of ceramic sensing elements. The aim is to create a
ready-to-mount sensor system with a ratiometric output signal and a
suitable
level of precision without a temperature compensation.
Link: Article
aan504.pdf
Question:
What is a pressure sensor module?
Answer:
Pressure sensor modules are pressure sensors, whose output signals have
to be calculated by an external microprocessor.
More answers on technical questions concerning the sensors of Intersema
and MEAS can be found here: MEAS
Inc.
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