Vaisala PTU300 Guide de l'utilisateur Page 133

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Chapter 6 ___________________________________________________Calibration and adjustment
VAISALA ______________________________________________________________________ 131
3. Remove the filter from the probe and insert the probe head into
a measurement hole of the 11 % RH (LiCl) in the humidity
calibrator HMK15. Use the adapter fitting for the PTU307
probe.
4. Wait at least 30 minutes for the sensor to stabilize (the indicator
led is lit continuously). Adjustment cannot be done if the
conditions are not stabilized (indicator led is flashing).
5. When the indicator led is lit continuously press the LiCl~11%
button to adjust the 11 % RH condition. After adjustment
transmitter returns to normal operation mode (indicator led is
unlit).
NaCl reference
6. When adjusting in the second reference 75 % RH, press the
ADJ button to open the adjustment mode. The indicator led
starts flashing.
7. Insert the probe head into a measurement hole of the 75 % RH
(NaCl) reference chamber of the humidity calibrator HMK15.
Use the adapter fitting for the PTU307 probe.
8. Wait at least 30 minutes for the sensor to stabilize (the indicator
led is lit continuously). Adjustment cannot be done if the
conditions are not stabilized (indicator led is flashing).
9. Press the NaCl~75% button to adjust the 75 % RH condition. After
adjustment transmitter returns to normal operation mode
(indicator led is unlit).
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 key.
4. Select 1-point/ 2-point adjustment. Press the START key.
5. Select the reference as guided by the display, press the
SELECT key.
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