Vaisala DMT340 - Manual (Page 160)

User's Guide _______________________________________________________________________
158 __________________________________________________________________ M210704EN-G
Two-Point Relative Humidity Adjustment
using Serial Line
Perform purge before adjustment. Use the PURGE command. See
section PURGE on page 139.
Then press adjustment button on the motherboard inside the transmitter
to enable adjustments
Perform adjustment with the FCRH command. Wait at least 1 hour
before adjusting each point.
FCRH
Example:
>fcrh
RH : 3.90 Ref1 ? 0
Press any key when ready ...
RH : 3.90 Ref2 ? 15
OK
>
One-Point Dewpoint Adjustment using
Display/Keypad
Before proceeding with the T
d/f
adjustment you must perform the RH
adjustment. For DMT340 DRYCAP® M-sensor, the reference
temperature of the dewpoint should be -
57 ˚C ... -67 ˚C (-70.6 ˚F ... -88.6
˚F).
Use preferably the display/keypad to perform one-point dewpoint T
d/f
adjustment. To adjust the dewpoint, follow the instructions below:
1. Press the ADJ button on the motherboard to open the
ADJUSTMENT MENU.
2.
Press the ► arrow button to select Adjust T
d
measurement.
3. Select by pressing 1-point T
d
adjustment. Press START to start
adjusting.
4. Leave the sensor to stabilize for at least 5 hours. Follow the
instructions on the display.