Pro CO
2
TM
Carbon Dioxide Analyzer
NUVAIR Rev.02.14.12
Page
11
Pro CO
2
Carbon Monoxide Analyzer Manual
4.3. Alarm Setting (AL 1 & AL 2)
1.) Press the “Prog” button for more than two seconds and then release the button.
On the display will appear “Pr” for two seconds, then “AL1” will appear and be ready
for changing the value of the low alarm point. After a second the display will show the
value of “AL1” CO
2
ppm current setting.
2.) The blinking digit shows the cursor position.
3.) Press the “Prog” button to increase the value (from 0 to 9)
4.) Press the “Adjust” button to move the cursor to the next digit, the “Adjust” button will
be used to cycle through the rest of the digits.
5.) To complete your entry and save the CO
2
ppm value, press the “On/Off” button. You
will then automatically jump to “AL 2” programming view.
6.) Repeat steps 3 through 5 to modify and save the “AL 2” high alarm CO
2
ppm desired
value.
7.) Once programming of “AL 2” is complete you will be in the “FSC” Value Screen and
ready for programming this value. To jump to the end continue to press the “On/Off”
button until the end screen appears.
4.4. Full Scale Value Setting (FSC)
Once the alarms have been set the Pro CO
2
Analyzer goes to “FSC” view so that you can
change the analog full scale value. It is not necessary to modify this value which is factory
set at 1999. However if installing a new sensor the value on the sensor can be entered into
the “Fsc” setting and must be entered into the “Fct” setting. This is the Carbon Dioxide
concentration corresponding to 20 mA on the analog output. 4mA is the value at 1999 ppm
of Carbon Dioxide. This value can be changed in the same manner as the Alarm settings:
1.) Press the “Prog” button for more than two seconds and then release the button.
On the display will appear “Pr” for two seconds, then “AL 1” will appear. Press the
On/Off button to cycle through the Alarm settings until you reach the “FSC” view. The
“FSC” screen and a 3 digit value will alternate for a few seconds and the Pro CO
2
Analyzer will be ready for adjusting the “FSC” Value.
2.) The blinking digit shows the cursor position.
3.) Press the “Prog” button to increase the value (from 0 to 9) (0-19 on the third value)
4.) Press the “Adjust” button to move the cursor to the next digit, the “Adjust” button will
be used to cycle through the rest of the digits.
5.) To complete your entry and save the FSC value, press the “On/Off” button. You will
then automatically jump to “End” programming view.
5.0. Threshold Alarms
The CO2 analyzer will alarm until it has reached the AL1 (low) set point if the AL1 has
been set. Once the gas is above the AL1 set point the analyzer will not alarm until the
gas value is over AL2 or under AL1 during the gas analyzation. Should the Carbon
Dioxide gas trip the low or high alarms (AL1 or AL2) the instrument will go into alarm
mode and will activate the (optional) relays output (open collector max 100mA) and the
internal buzzer. The display will show the trespassed alarm and the actual measured
value. To stop the audible alarm, press any key. In this event the Pro CO
2
Analyzer will
remain in alarm mode until the analyzed value reads between the AL1 and AL2 set points.
The relay output typically is used to shut down the compressor. Nuvair can supply the
necessary components to adapt your compressor to the relay or provide them at the time
of install on a new compressor.
