Vaisala PTU300 - Manual (Page 170)

User's Guide _______________________________________________________________________
168 __________________________________________________________________ M210796EN-G
Using Display/Keypad
Note that the difference between the two humidity references must be at
least 50 %RH.
1. Carry out the chemical purge (if available).
2. Press the ADJ button (opens the ADJUSTMENT MENU).
3. Select Adjust RH measurement, press the right arrow button.
4. Select 1-point/ 2-point adjustment. Press the START key.
5. Select the reference as guided by the display, press the SELECT
key.
0706-005
Figure 76 Selecting Point 1 Reference Type
6. Remove the filter from the probe and insert the probe into a
measurement hole of the dry end reference chamber (for example,
LiCl: 11 %RH in the humidity calibrator HMK15.) Use the adapter
fitting for the PTU307 probe.
7. Wait at least 30 minutes for the sensor to stabilize. Follow the
stabilization from the GRAPH display.
8. Press the READY key when stabilized. If you have chosen the
Other reference value, enter now the reference value by using the
arrow buttons.
When carrying out the 2-point adjustment proceed to the next
adjustment point and carry out the procedure as described in the
previous steps.
9. Press YES to confirm the adjustment. Press the OK key to return to
the adjustment menu.
10. Press the EXIT key to close the adjustment mode and return to the
basic display. Before closing the adjustment mode, feed the
adjustment information into the device, see section Feeding
Adjustment Information on page 178.