
Chapter 5 ___________________________________________________ Calibration and Adjustment
VAISALA_______________________________________________________________________ 113
One-Point Dewpoint Adjustment
One-Point Dewpoint Adjustment
Using Display/Keypad
NOTE
This is a highly critical adjustment, to be performed only in
laboratory conditions.
Preferably use the display/keypad interface to perform one-point
dewpoint T
d/f
adjustment. Before proceeding with the Td/f adjustment
you must perform the RH adjustment. For DMT345/346, the
reference dewpoint must be below -25 °C (-13 °F) and temperature
must be below 40 °C (104 °F).
NOTE
This adjustment is valid only if the measurement or process is in the
lower end of the measurement range (in very dry). See Specifications
on page 127.
When adjusting the dewpoint, refer to the following instructions:
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 one (1) hour. Follow the
instructions on the display.
0605-018
Figure 50 Following Stabilization
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