Vaisala HMP155 User Manual download pdf (Page 65)

Chapter 6 ___________________________________________________Calibration and Adjustment

VAISALA _______________________________________________________________________ 63

Serial Line Calibration

Two-Point Humidity Adjustment

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

least 30 %RH.

To make a humidity adjustment:

1. Connect the HMP155 to a PC. See section Serial Line

Communication on page 24. Open a terminal program.

2. Carry out the chem

ical purge (if available). See section Chemical

Purge (Optional) on page 45.

3. Press the

ADJ button and the green LED lights up.

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).

5. Enter the

CRH command and press ENTER.

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

7. Press

ENTER a few times to check if the reading has stabilized.

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

the question mark and press

ENTER.

>crh

RH : 16.6675 1. ref ?

RH : 16.4978 1. ref ?

RH : 16.3956 1. ref ? 11.25

Press any key when ready ...

RH : 11.25 Ref2 ?

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

probe into the measurement hole of the high end reference chamber

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

HMK15). Press any key when ready.

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

stabilization by pressing

ENTER.

11. When stabilized, type the high end reference value after the

question mark and press

ENTER.

RH : 75.45 Ref2 ?

RH : 75.57 Ref2 ?

RH : 75.55 Ref2 ?

RH : 75.59 Ref2 ? 75.5

12. OK indicates that the adjustment has succeeded and the new

calibration coefficients are calculated and stored.

1 2 ... 60 61 62 63 64 65 66 67 68 69 70 ... 83 84

Comments to this Manuals

No comments

Vaisala HMP155 User Manual Page 65

Comments to this Manuals

Related products and manuals for Humidifiers Vaisala HMP155