AK2 Datasheet, PDF (5/7 Pages) EPCOS – Pressure sensors AK2 series

Pressure sensors
Gauge pressure transducers
AK2 series
Symbols and terms
1) _{Storage temperature range Tst}
A storage of the pressure sensor within the temperature range Tst,min up to Tst,max
and without applied pressure and supply voltage will not affect the performance of the pressure sensor.
2) _{Operating temperature range Ta}
An operation of the pressure sensor within the temperature range Ta,min up to Ta,max
will not affect the performance of the pressure sensor.
3) _{Rated pressure pr}
Within the rated pressure range 0 up to pr the signal output characteristic corresponds to this specification.
4) _{Overpressure pOV}
Pressure cycles within the pressure range 0 up to pov will not affect the performance of the pressure sensor.
5) _{Supply voltage VDD}
VDD,max is the maximum permissible supply voltage, which can be applied without damages.
The output voltage Vout is ratiometric (Vout ~ VDD).
6) _{Offset V0}
The offset V0 is the signal output Vout(p = 0) at zero pressure.
7) _{Sensitivity S}
Within the pressure range 0 up to pr the output voltage is Vout(px) = V0 + S · px
8) _{Nonlinearity L (including pressure hysteresis)}
The nonlinearity is the deviation of the real sensor characteristic Vout = f(p) from the ideal straight line.
It can be approximated by a polynomial of second order, with the maximum at px = pr / 2 .
The equation to calculate the nonlinearity is:
L = ^{Vout (px ) − V0} − ^px
V_out (p_r ) − V₀ p_r
9) _{Temperature hysteresis}
The temperature hysteresis is the change of offset, starting from the value at 25 °C after a temperature change
and return to 25 °C. Determined during temperature cycles in operating temperature range (cycles with 1 K/min).
(Full Scale): FS = VFS = S · pr
10) _{Temperature coefficients of the bridge resistance αRS, βRS}
Bridge resistance at temperature Tx: RS(Tx) = RS(25 °C) · [ 1 + αRS · (Tx – 25 °C) + βRS · (Tx – 25 °C)² ]
Values are valid within the operating temperature range Ta,min up to Ta,max
Out of the operating temperature range, the deviation may increase.
11) _{Temperature coefficients of the sensitivity αS, βS}
Sensitivity at temperature Tx: S(Tx) = S(25 °C) · [ 1 + αS · (Tx – 25 °C) + βS · (Tx – 25 °C)² ]
Values are valid within the operating temperature range Ta,min up to Ta,max
Out of the operating temperature range, the deviation may increase.
12) _{Temperature coefficient of offset TCV0}
Offset at temperature Tx: V0(Tx) = V0(25 °C) + TCV0 · (Tx – 25 °C) · VDD
Values are valid within the operating temperature range Ta,min up to Ta,max
Out of the operating temperature range, the deviation may increase.
AS SEN PD
Please read Cautions and warnings and
Important notes at the end of this document.
Page 5 of 7
2009-08-03