Display/keypad commands____________________________________________________________
Vaisala _________________________________________________________________________ 34
CHAPTER 7
DISPLAY/KEYPAD COMMANDS
With these commands you can scale the outputs and select special
output quantities if the transmitter configuration allows that.
NOTE
Chapter 9 describes separately display/keypad commands for the
calibration.
Setting the pressure for calculations
In humidity transmitters, ambient pressure is used for the mixing ratio
and wet bulb calculations. In dewpoint transmitters (natural gas
applications), the process pressure in the measurement point is
required to achieve the specified accuracy.
To modify the pressure settings, turn the transmitter's internal
CALIBRATION ENABLED
/
DISABLED
dip switch to position
ENABLED
(up). Press button
C
on the display cover: text "SCAL" appears on the
display. Then press button
E
until the following display appears (the
numeric value is always the existing setting, in this example 1013.25):
Adjust the pressure reading with buttons
▲
and
▼
. Acknowledge the
value with button
E
. To complete the pressure setting, turn the dip
switch back to position
DISABLED
(down).
See the pressure conversion table on page 42.
