The basic test for Zone #1 or Zone #2 is now complete. If you just ended Zone #1 test, please do
again STEP 3 to STEP 9 while replacing « Zone #1 » by « Zone #2 » in the text.
PLEASE WAIT UNTIL CO2 PPM LEVEL GOES DOWN BELOW 1500 PPM BEFORE
STARTING THE TEST ON ZONE #2.
The CO
2
SENSOR (SNIFFER) CALIBRATION instructions follow.
TROUBLESHOOTING
9
Blow softly on Zone #1 sensor
You will see the CO
2
PPM level on screen going up
to a value up to 5000 PPM and above. If needed, blow
closer to the module or stronger : your breath contains
a lot of CO
2
.
The Zone #1 OUTPUT indicator must turn OFF and
the screen will show « OVER » and « 5000 »
alternately.
10
Check the CO
2
Controller calibration
to confirm whether calibration is
required or not.
IF REQUIRED, you will find the
calibration procedure on next page.
You must bring the sensor close to an open door or
window or simply outside. Wait 1-2 minutes to get a
stable value and AVOID breathing near the sensor.
The CO
2
PPM value on controller screen should
be between 350 and 450 PPM, sometimes up to 500
in urban surroundings. In this case, your module
DOES NOT NEED calibration.
Note : The CO
2
sensor (sniffer) is precise to +/- 75
PPM (industry standard) meaning that two or more
modules in the same room are likely to indicate differ-
ent ppm values, showing variation between them of
up to 150 ppm. THIS IS NORMAL and no action is
required. If the variation between readings is beyond
150-200 ppm, one of them is likely to require a cali-
bration. Be aware that a difference of 100 PPM has
insignificant effect on plants.
14
