Vaisala PTU300 - Manual (Page 111)

Chapter 4 _________________________________________________________________ Operation
VAISALA _______________________________________________________________________ 109
*9900SN
Example:
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A2100012
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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
2
O and inH
2
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.