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38
0) Full Calibration
This calibration procedure erases the data of the previous calibrations.
For a correct calibration
of the probe the first point must be at 75%RH
and the second point at 33%RH. On conclud-
ing the second point at 33%RH, the instrument also proposes a third calibration point at 11%RH:
if you do not want to use it, it is sufficient to press the <ESC/CLR> key to quit without making
this last correction.
To complete correct calibration it is very important that the probe and the saturated solutions be
at the same temperature and that the temperature be as stable as possible throughout calibration.
Calibration sequence:
1.
Unscrew the sensor protection at the end of the probe.
2.
In its place, right down to the base, screw on the perforated cap with its threaded ring nut
(these come in different sizes depending on the type of probe).
3.
Open the cap of the 75%RH saturated solution.
4.
Check that there are no drops of solution inside the measuring chamber; if there are any, dry
them with absorbent paper.
5.
Insert the probe in the container, ensuring that the cap with the probe goes down to the base.
The measuring chamber must be perfectly closed, otherwise it will not become satu-
rated
: it is fundamental that there be no possibility of air from the outside getting into the
chamber.
6.
Wait at least 30 minutes
.
7.
Press the key <
0
> to select the calibration version “
0)
Full calibration
”; a message will ap-
pear reminding you that, if you continue, all the data referring to previous calibrations will be
erased. Press <ENTER> to continue or <ESC/CLR> to cancel the operation without making
any changes.
8.
The following screen will appear:
using the arrow keys (
Up and Down)
it is possible to correct the value of the saturated solu-
tion with respect to the 75.0 proposed by the instrument. The temperature is the one meas-
ured by the Pt100 or TC sensor, the initial relative humidity value is 0.0%RH since the data
of the previous calibrations have been erased. To confirm the first calibration point you can
use the <REL> key or the <ENTER> key: with the first the correction is “applied” remaining
in the same screen; with the <ENTER> key you move directly on to the screen for the cali-
bration of 33%RH.
The <REL> key is useful when you want confirmation of the correction made before going
any farther: to move on to the second point at 33%RH press the <ENTER> key.
9.
Take the probe out of the container with 75%RH, close the container with its cap and open
the container of the saturated solution with 33%RH. Check that there are no drops of solution
inside; if there are any, dry them with absorbent paper.
10.
Insert the probe in the container, ensuring that the probe and the cap goes perfectly down to
the base.
11.
Wait at least 30 minutes
.
