5
P1.0 CO2 ALARM
In the setup mode, “P1.0” and “AL” are shown on the LCD display.
Press “Mnx /AV” to enter “P1.1” and to set the CO2 alarm. The current set-value appears blinking
on the LCD display. Press “MODE” to increase the value or press DP/WBT to decrease value.
With every push on these buttons, the alarm will be increased/decreased with 100 ppm from 100
to 9900 ppm. When the desired alarm value is set, press “Mnx /AV” to save or press “CAL/Esc” to
return to “P1.0” saving all settings.
P3.0 TEMPERATURE SCALE (°C OR °F)
Press “MODE” or “DP/WBT” in “P1.0” to enter “P3.0” to adjust the temperature scale. Press “Mnx/
AV” in front of “P3.1” with the blinking °C bottom left of the LCD display (to switch between °C or °F,
press “MODE” or “DP/WBT”). Next, press “Mnx/AV” to save or press “CAL/Esc” to return to “P3.0”
without saving.
CO2 CALIBRATION
The HS-2 is calibrated at 400ppm CO2 value at the factory.
Only calibrate the sensor if you suspect a deviation. Our experience has shown that the SenseAir®
sensors that we use can function for two years without calibration, easily.
The sensors are calibrated from the factory with the highest accuracy, but it may occur that after
one year the sensor shows a deviation and has to be calibrated again
WARNING:
Do NOT calibrate the HS-2 in an area of which the CO2 value is unknown. Otherwise, the meter
will be calibrated automatically as 400ppm, which will lead to inaccurate measurements. It is
advised to conduct a manual calibration in outdoor air when the weather is sunny.
+Place the HS-2 on the calibration site.
+Activate the HS-2 and press “CAL/Esc” and “MODE” simultaneously to enter the CO2 calibration
menu.
+400ppm and “CAL” are now blinking on the LCD display while the calibration is busy.
+Wait for 5 minutes until the blinking stops and the calibration is nished and returns to normal
mode.
To stop the calibration, you can deactivate the HS-2 at any moment.
NOTE: make sure that the batteries are full during calibration to prevent interruption or failed
calibration.
