Vaisala HMP155 - Manual (Page 66)

USER'S GUIDE____________________________________________________________________
64 _______________________________________________________________ M210912EN-C
13. Enter the adjustment information (date and text) to the memory of
the probe; see the commands CTEXT and CDATE.
14. Reset the probe with the RESET command.
15. Take the probe out of the reference conditions and replace the
filter.
Two-Point Temperature Adjustment
NOTE In the passive output version of HMP155, the temperature cannot be
calibrated.
Note that the difference between the two temperature references must be
at least 30 ºC. The additional temperature sensor is suitable for
calibration in liquid bath.
To make a temperature adjustment:
1. Press the ADJ button to enable the adjustment mode. This lights up
the green LED on the probe. If using a warmed probe for
measuring, probe heating will be interrupted when ADJ button is
pressed.
2. Wait some time for the probe to reach ambient temperature.
3. Enter the CT command (or CTA for additional T-probe) and press
ENTER .
4. Press ENTER a few times to check if the reading is stabilized. Let
the reading stabilize, give the reference temperature after the
question mark and press ENTER three times.
Example (2-point adjustment):
>ct
T : 18.6038 1. ref ?
T : 18.6068 1. ref ?
T : 18.6098 1. ref ? 19.0
Press any key when ready ...
T : 49.5176 2. ref ? 50.0
OK
>
5. Move the probe into another reference temperature and let the
reading stabilize. Give the reference temperature after the question
mark and press ENTER, see example above.
6. OK indicates that the calibration has succeeded.
7. Enter the calibration information (date and text) to the probe's
memory; see the serial commands CTEXT and CDATE.
8. Reset the probe with RESET command.