11
7.
HUMIDITY/TEMPERATURE CALIBRATION
The EE29/31 transmitter series can be calibrated in two ways.
-
1-point humidity/temperature calibration: quick and simple calibration on a defined
humidity/temperature point (working point).
-
2-point humidity/temperature calibration: simple calibration for accurate measuring results
over the whole humidity/temperature working range.
•
To reach a temperature balance it is recommended to keep the transmitter and the
reference chamber (e.g. HUMOR 20,...) for minimum 4 hours in the same room.
•
During stabilisation period and calibration procedure it is important to keep the tempe-
rature constant in the reference climate chamber.
•
For calibration the humidity sensor probe must be stabilised at least 20 minutes into the
reference chamber.
•
Replace a used dirty filter cap before calibration!
7.1
2-point humidity calibration
For accurate adjustment over the whole working range or in case of sensor exchanges a
two point calibration is recommended.
•
Start calibration at the low humidity calibration point!
•
The humidity difference between the two points should be > 30%RH
•
Low humidity point < high humidity point
•
Two point calibration may be performed directly on the circuit board, or for
convenience, using the configuration software supplied (for more details, see
Configuration Software, chapter 5.4 ”Calibration”)
i
i
1.
Insert the sensor probe into the reference humidity 1 (low
calibration point ) and stabilise for at least 20 minutes.
2. BUTTON S2:
Pressing the button for 5 seconds starts the
procedure for the calibration mode RH. The calibration mode is
indicated by the lit LED "D2" on the circuit board.
3. BUTTON S2:
Pressing the button for 5 seconds starts the
procedure for the low calibration point. The calibration mode is
indicated by the lit LED "D2" and the symbol "CALIB LOW" will
appear on the optional LCD display.
4. BUTTON S1 (up)
and
S2 (down)
: Pressing one of the two
buttons will adjust the measuring value in steps of 0.1% up or
down to the reference value. The actual measuring value is indi-
cated on the display or can be measured with the analogue out-
put. As soon as the measured value is changed, "D1" is flas-
hing.
5. BUTTON S1 (store)
: Pressing the button for 5 seconds
stores the calibration value and the procedure is ended. LED
"D2" flashes to indicate exiting of the calibration mode and the
symbol "CALIB LOW" will disappear from the optional LCD
display.
BUTTON S2 (cancel)
: Pressing the button for 5 seconds the
calibration procedure will be ended without storing the
calibration values. LED "D2" flashes to indicate exiting of the
calibration mode and the symbol "CALIB LOW" will
disappear from the optional LCD display.
low calibration point:
2-point humidity calibration procedure on the circuit board!
S2
S2
S2
S1
S1
S2
D2
green
D2
green
D2
green
D1
red
D2
D2
“CALIB LOW”
Hardware
