AT2 datasheet(5/7 Pages) EPCOS

5 / 7 page

Pressure sensors

Absolute pressure transducers

AT2 series

Preliminary data

AS SEN PD

2009-08-03

Please read

Cautions and warnings and

Page 5 of 7

Important notes at the end of this document.

Symbols and terms

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.

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.

Rated pressure pr

Within the rated pressure range 0 up to pr the signal output characteristic corresponds to this specification.

Overpressure pOV

Pressure cycles within the pressure range 0 up to pov will not affect the performance of the pressure sensor.

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).

DC break down voltage Vis

The pressure sensor withstands a high voltage between the stainless steel pressure connection and the electrical

connection VDD and Vout (all short circuited) without damage.

Offset V0

The offset V0 is the signal output Vout(p = 0) at zero pressure.

Sensitivity S

Within the pressure range 0 up to pr the output voltage is Vout(px) = V0 + S · px

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:

out

)

(

)

(

−

10) 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

11) Temperature coefficients of the bridge resistance α

αRS, β

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.

12) Temperature coefficients of the sensitivity α

αS, β

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.

13) Temperature coefficient of offset TCV

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.

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