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. For more detailed information please read the whitepaper
Question: What is a relative pressure sensor?
Answer: Relative pressure
sensors measure the difference between the ambient pressure and the
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
Question: What is a differential pressure 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
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
measured comparative to a given pressure.
Question: What is a ratiometric sensor?
Answer: A ratiometric sensor
is a sensor whose output signal changes synchronously with the
of the supply voltage.
Question: How do you protect silicon sensors
Answer: Pressure sensors with
silicon measuring cells are sensitive to liquids and a multitude of
aggressive substances. The article describes which arrangements can
made to reduce the feared media sensitivity of relative-
difference pressure sensors dramatically.
Question: How do you calibrate ceramic measuring
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
level of precision without a temperature compensation.
What is a pressure sensor module?
Pressure sensor modules are pressure sensors, whose output signals
to be calculated by an external microprocessor.
Question: How do you measure the level of liquids
with a pressure sensor?
Answer: How to measure the
hydrostatic pressure by using a pressure sensor is
described on the application note aan506.
More answers on technical questions concerning the sensors of MEAS
be found on the website of MEAS INC.