Vaisala PTU300 Guia do Utilizador descarregar pdf (Página 171)

Chapter 7 ____________________________________________________ Calibration and adjustment

VAISALA _______________________________________________________________________ 169

Using Serial Line

Note that the difference between the two humidity references must be at

least 50 %RH.

1. Connect the PTU300 to a PC. See section Serial Line

Communication on page 81. Open a terminal program.

2. Carry out the chemical purge (if available).

3. Press the ADJ button.

4. 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.

5. Enter the CRH command and press ENTER.

>crh

6. Wait at least 30 minutes for the sensor to stabilize.

7. Type C and press ENTER a few times to check if the reading is

stabilized.

8. When the reading is stabilized, give the reference humidity after

the question mark and press ENTER.

>crh

RH : 11.25 Ref1 ? c

RH : 11.24 Ref1 ? c

RH : 11.24 Ref1 ? 11.3

Press any key when ready ...

9. Now the device is waiting for the high end reference. Insert the

probe into a measurement hole of the high end reference chamber

(for example,. NaCl: 75 %RH chamber in the humidity calibrator

HMK15). Use the adapter fitting for the PTU307 probe. Press any

key when ready.

10. Let the probe stabilize for about 30 minutes. You can follow the

stabilization by typing C and pressing ENTER.

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Vaisala PTU300 Guia do Utilizador Página 171