Pro He
TM
Alarm Helium Analyzer
NUVAIR
Page
12
www.nuvair.com
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 alarm percentage. Default is 100% and if either alarm is
set at 100% the alarm will be excluded. After a second the display will show the value
of “AL1” He % 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 He % 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” if desired or leave at 100% to
exclude alarm.
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 He 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 100. This is the Helium concentration corresponding to 20 mA on the analog output.
4mA is the value at 0% of Helium concentration. 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 He
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 “tOn” programming view.
4.5. Auto Switch Off Delay Time (tOn)
In this setting it is possible to change the auto off delay time of the Analyzer. The display will
show 180 seconds default, We manually change this to 600 seconds before shipping. This
value is changed by the same procedure as the Alarm settings, follow procedure above in
4.3. This setting can be adjusted from 0 to 1999 seconds. To keep the instrument from
turning off the Analyzer time should be set to “000” seconds. To complete your entry and
move to the end screen press the power on/off button when programming is complete.
The analyzer will shut off after the set time value is reached that is programmed into the
analyzer. If you are using the analyzer for continuous blending, set the value to “000” to
prevent the analyzer from shutting off automatically. With the analyzer off inaccurate gas
mixture could take place and lead to a death. Always analyze mixed gas before you dive.
