glossary of technical terms
Find hereafter a useful glossary of technical terms on the subject of pressure measurement.
If you have any further questions, please do not hesitate to contact us at any time.
Headquarters of the BDS-Group
Mrs. Jena / Mrs. Götz
Germany - 95199 Thierstein
Tel. 0049 / 9235 98 11 0
Fax. 0049 / 9235 98 11 11
In the following you get elaborations of our technical terms:
In rare cases it can prove necessary to measure the - physical - pressure in absolute terms (e.g. in closed systems). The sensors used in such cases must be specially encapsulated, however.
The lowest measured value to which the measuring device has been collimated. e.g.: 20 mA
The response time describes (act. to DIN EN 61298 and DIN EN 60770) the period between the start of the step response time and the time for the output to reach and remain within 1% of output span of its steady value. The step corresponding to 80% of output signal, giving an output change from 10% to 90%, then another from 90% to 10%.
Synonymical (in the standards DIN EN 61298 and DIN EN 60770) it can be used the definitions response time and settling period.
The highest measured value to which the measuring device has been collimated. e.g.: 20 mA
The actual permissible extent of deviation from the ideal characteristic curve is specified in terms of accuracy.
hydrostatic level measurement
The pressure exerted at a particular depth of a given fluid above the position in question. For water, which has a density of 1 g/cm³, the pressure increases by around 100 mbar per metre of water depth. By calibratingon the basis of the density applicable for the fluid in question, the output signal of a hydrostatic level probe can be adjusted to the depth of fluid to be measured.
The relationship between measured value and the output value is described by the characteristic curve. This is ideally a straight line.
deviation of characteristic curve
The devation from the linear is the amount of deviation from the characteristic curve of a reference line.
The pressure measurement is normally made relative to the existing air pressure, i.e. the air pressure corresponds to 0 bar. For pressures greater than the air pressure the value obtained is a positive one (overpressure). For pressures less than the air pressure it is negative (negative pressure).
types of sensors
Piezoresistive silicon sensors
stainless steel thin film sensors
range / full scale output (FSO)
The algebraic difference between final value and initial value e.g.: 20mA-4mA=16mA
1 mbar = 100 Pa