HD31
- 95 -
V1.6
Fig. 13.3.3: calibration of the Pt100 sensor to the reference value
13.3.2
C
ALIBRATION OF THE RELATIVE HUMIDITY SENSOR
Before starting the calibration operation, better
verify
, using saturated solutions (75.4%RH and
33%RH), if a new calibration is needed: proceed with calibration only if an error of a few humid-
ity points in one of the two calibration points
is discovered.
When selecting the calibration of the relative humidity sensor, four options are displayed:
Fig. 13.3.4: types of RH sensor calibration
•
FULL TUNING
: calibrates the probe in one, two or three points. The possible calibration
points are 75%RH, 33%RH and 11%RH. The probe can also be calibrated in one or in
two points only: as for the non-calibrated points, the instrument will use the values
stored in the previous user calibration or, failing this, the factory values. As for one-point
calibration it is recommended to use the next options.
•
75% TUNE-UP
: calibrates the probe at 75%RH.
•
33% TUNE-UP
: calibrates the probe at 33%RH.
•
11% TUNE-UP
: calibrates the probe at 11%RH.
Select the desired type of calibration using
S
and
T
, then press the
F3
key (
OK
command) to
confirm.
Pre-calibration operations:
Check that the elements below are all present inside the chamber with saturated saline solu-
tions:
• solid state salt,
• liquid solution or wet salt, especially for the 75%RH solution.
The instrument and the saturated solutions to be used for this operation must be placed in a
stable temperature environment for the entire calibration period. Wait for at least a couple of
Summary of Contents for HD31
Page 6: ...HD31 6 V1 6 2 DESCRIPTION Fig 2 1 instrument description...
Page 149: ...HD31 149 V1 6 NOTES...
Page 150: ...HD31 150 V1 6 NOTES...
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