Vaisala DRYCAP DMT346 Guide de l'utilisateur Page 75

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Chapter 4 _________________________________________________________________ Operation
VAISALA________________________________________________________________________ 73
NOTE
This command changes both the serial output and display units to
either metric or non-metric units. When you want to output both
metric and non-metric units simultaneously on the display, select the
display units by using the display/keypad.
Pressure Compensation Setting
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. If you are using mixing
ratio as an output quantity, it is recommended that you make the
pressure compensation setting.
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.
NOTE
Fixed pressure compensation value of 1013.25 hPa is used when in
adjustment mode.
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 70.
1. Open the MAIN MENU by pressing any of the ▲▼◄► arrow
buttons.
2. Select Measuring and press the arrow button to confirm your
selection.
3. Select Pressure compensation and press the arrow button to
confirm you selection.
4. Press SET and enter the pressure value by using the arrow
buttons.
5. Press OK and EXIT to return to the basic display.
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