Cosa-xentaur Xentaur LPDT Manuel d'utilisateur télécharger pdf (Page 46)

Appendices

page 39

Appendix F: Pressure Correction

Sensor Pressure

is used in the context that this is the pres-

sure inside the sampling chamber when performing the

measurement, i.e. it is the operating pressure of the sensor.

Gas Pressure

is used in the context that this is the pressure at

which the dewpoint is to be calculated.

Pressure Correction

is used in the context that the values

displayed signify the moisture content at some pressure (we

refer to this as the ‘Gas Pressure’) different from the pres-

sure at the sensor. Note that PPM, LBS and G/M

readings

are by definition unaffected by pressure correction because

only the pressure at the sensor affects their value. While °C

and °F are affected by pressure correction by reporting what

the dewpoint would be at the Gas Pressure when the dew-

point is what is measured at the pressure at the sensor. How-

ever, this also implies that whether pressure correction is

applied or not the PPM, LBS and G/M

readings are

affected by the setting of the sensor pressure.

The factory default settings are: 14.7psi for both sensor and

gas pressure and pressure correction disabled.

When Pressure correction is disabled all dewpoints are

computed by assuming that both Sensor and Gas Pressures

are 14.7psi.

As all Xentaur dewpoint meters, the LPDT is equipped with

the necessary software to perform pressure correction.

However, for the lack of space, the LPDT does not have a

Pressure Correct button. Therefore the user can not set or

enable Pressure Correction, this must be done at the factory.

Consult with your representative.

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Cosa-xentaur Xentaur LPDT Manuel d'utilisateur Page 46