21
1-point humidity calibration /
1-point temperature calibration
When the working range is limited to a certain more narrow range, a calibration at one
humidity point /
one
temperature point
is sufficient.
•
In accordance with the working range, either the high or low calibration point should
be selected. (CP > or < 50% RH / CP > or < 50% of measurement value)
•
This calibration causes an extra inaccuracy for the rest of the working range.
1-point humidity calibration procedure /
temperature calibration procedure
1.
At the beginning of a humidity calibration set the jumper to CAL RH /
for a
temperature calibration set the jumper to CAL T.
2.
Insert the sensor probe into the reference humidity /
reference temperature
(calibration point) and stabilise for at least 30 minutes.
3.
BUTTON S1
(Calibration point > 50% RH /
> 50% of measurement value
): Pressing
the button for 3 seconds starts the procedure. The calibration mode is indicated by the
lit LED "D1" and by the symbol "CAL>" on the LC display.
or
BUTTON S2
(Calibration point < 50% RH /
< 50% of measurement value
): Pressing
the button for 3 seconds starts the procedure. The calibration mode is indicated by the
lit LED "D1" and by the symbol "CAL<" on the LC display.
4.
BUTTON S1 (up)
and
S2 (down)
: Pressing the two buttons will adjust the measu-
ring value in steps of 0.1% /
0.1 degC
up or down to the reference value. The actual
measuring value is indicated on the display or can be measured with the analogue output.
5.
BUTTON S1
: Pressing the button for 3 seconds the calibration value is stored and
the procedure is ended. Exiting the calibration mode is indicated by deactivation of the
LED "D1" and the symbol "CAL" on the LC display.
BUTTON S2
: Pressing the button for 3 seconds the calibration procedure will be
ended without storing the calibration values. Exiting the calibration mode is indicated
by deactivation of the LED "D1" and the symbol "CAL" on the LC display.
Resetting the customer calibration to the factory calibration:
BUTTON S1 and S2
: To reset the RH or T values, the jumper has to be set on the
respective location before starting the factory calibration.
In neutral mode pressing both buttons simultaneously for 5 seconds customer calibration
settings are reset to factory calibration. A short flash of the LED "D1" indicates the reset.
MAINTENANCE
Sensor Replacement
-
After changing the sensor it is necessary to perform a two point calibration to reach
the specified accuracy again!
-
The factory calibration is no longer valid after performing a sensor exchange!
-
Touch the sensor elements on the connection wires only!
Sensor Replacement of Pluggable Sensors
1.
Switch off the supply voltage.
2.
Unscrew the filter cap carefully.
3.
Pull out the humidity sensor element with a tweezer.
4.
Put in the replacement sensor, the active side (see drawing) has to face the inside.
5.
Screw on the filter cap carefully (in case of pollution replace it by a new filter cap).
6.
Switch on the supply voltage.
7.
Perform a humidity calibration (refer to 2 point humidity calibration).
i
i
S1
S2
S1
S2
Calib
S1
Calib
S2
S1
S2
D1
D1
aktive Seite /
active Side
solder
points
active side
