OxyCheq Expedition-X Portable Oxygen Analyzer
Operators Manual 0602
5.0 Operation
5.1
The Expedition-X comes complete with a sensor flow cap/restrictor (figure #3) that allows you to read
directly from a cylinder valve.
a) Connect the cable to the sensor and analyzer.
b) Connect the sensor flow cap by screwing it over the sensor threads. It should be snug, but not
tight.
c) Slowly open the cylinder valve until you hear a slow, steady hiss. Place the sensor flow cap
against the valve outlet facing you.
d) Once the display reaches a consistent reading, close the cylinder valve.
e) Note that after a few seconds after the gas flow has stopped, the display reading will begin to drop
until it reaches the ambient oxygen percentage (20.9%).
f) If in doubt, repeat the procedures above.
g) An alternative method to sample gas would be to attach an optional flow restrictor to the arm on
the sensor flow cap/restrictor and connect it to your BC low pressure hose.
5.2
The Expedition-X also comes with a tee and diverter (figure #2) that allows you to sample gas from
the cylinder valve.
a) Connect the cable to the sensor and analyzer.
b) Screw the diverter onto the sensor threads.
c) Place the diverter into the bottom of the tee.
d) Slowly open the cylinder valve until you hear a slow, steady hiss. Place the tee against the valve
outlet facing you making sure you are not introducing air into the tee via Venturi effect.
e) Once the display reaches a consistent reading, close the cylinder valve.
f) Note that after a few seconds after the gas flow has stopped, the display reading will begin to drop
until it reaches the ambient oxygen percentage (20.9%).
g) If in doubt, repeat the procedures above.
h) An alternative method to sample gas would be to attach the tee to the optional DIN flow restrictor.
Doing so would eliminate any introduction of air via Venturi effect.
