Vaisala PTU300 Guide de l'utilisateur télécharger pdf (Page 111)

Chapter 4 _________________________________________________________________ Operation

VAISALA _______________________________________________________________________ 109

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Pressure Compensation Settings

The pressure has an effect on humidity calculations and accuracy.

Therefore, accurate calculations can be achieved only when the process

pressure is taken into consideration.

Note that conversions from mmHg and inHg are defined at 0 °C and for

mmH

O and inH

O at 4 °C.

NOTE

Pressure compensation is intended to be used in normal air only. When

measuring in other gases, please contact Vaisala for further information

Using Display/Keypad

Use display/keypad to set the pressure compensation. To select the

pressure unit using display/keypad see section Changing Quantities and

Units on page 101.

1. Press any of the arrow buttons to open the Main Menu.

2. Select Measuring and press the right arrow button.

3. Select Pressure compensation and press the right arrow button.

4. Use the up/down arrow buttons to select either Fixed: 1013.25hPa

or Measured P for pressure compensation.

5. Selecting Measured P: Press the SELECT key and then exit the

menu.

6. Selecting Fixed: 1013.25hPa: Press the SELECT key, and then

SET. You can move from a digit to another one by pressing the

left/right arrow buttons. To change the unit, press the up/down

arrow buttons.

7. Press the OK key and then exit the menu.

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Vaisala PTU300 Guide de l'utilisateur Page 111