HOW TO USE
CALIBRATION CHAMBER
The calibration chamber is a
tool for immersing the sensor in cali-
bration gases. It connects to the
bleed barb on the front panel via 1/8
in. ID tubing. It holds the tip of the
sensor in the gas stream.
First, connect the calibra-
tion chamber tubing to the "GAS
BLEED" hose barb on front panel of
the Proox 360.
Then insert the sensor tip into
the calibration chamber. The sensor
hole is sized for a snug fit and allows
the sensor to be in the gas stream
within the chamber:
Finally, with the calibration
chamber and the calibration tubing
connected, open the bleed valve knob
on the front panel of the Proox 360
until you hear the gas expelling
slightly through the calibration cham-
ber:
CALIBRATION
PROCEDURE FOR LOW
OXYGEN CONTROL
(Nitrogen control gas)
1. Connect the 1/4 in. ID tub-
ing, coming from the compressed
nitrogen gas source, to the barb
labeled "GAS SUPPLY 40 PSIG
MAX" on the back of the Proox 360.
Make sure the gas is regulated to 5-
40 PSIG. Never exceed 40 PSIG
or damage will occur to the unit.
For the best results use approxi-
mately 15-20 PSIG.
2. Make sure the switch on the
front panel labeled "GAS" is in the
"OFF" position. This will ensure that
no gas is being wasted while cali-
brating.
3. Check to make sure that the
gas is connected properly by open-
ing the bleed valve on the front panel,
if gas is heard expelling from the
bleed barb then the gas is connected
properly. Once you have confirmed
that the gas is connected correctly,
close the bleed valve.
4. Hook up the calibration
chamber to the "BLEED" hose barb
on the front panel of the Proox 360,
by using the 1/8 in. ID calibration
tubing. Slightly open the bleed valve
knob on the front panel until you can
hear the gas expelling slightly through
the calibration chamber this will es-
tablish a 0% oxygen level within the
calibration chamber.
5. Insert the sensor tip into the
calibration chamber and let the sen-
sor stabilize in 0% oxygen (minute or
two). Watch the sensor's response
to immersion in nitrogen, in work
mode, to tell when it stabilizes. Note
whether oxygen reading is above or
below "0.0" and by how much.
6. Enter program mode by
holding down the "up" and "down"
buttons for three seconds, navigate
to the "LEVL" function and while
holding down the " * " button, push
the "up" button until you reach "3".
Then navigate to the "ZEro" function
and raise the setting if reading was
low, or decrease the setting if read-
ing was high. To change the number
hold down the " * " button, push the
"up" or "down" button until you reach
the desired number. The number in
the "ZEro" function stands for the
same amount in work mode. For
example: if you change the number
in "ZEro" function by ".2" the num-
ber in work mode will change by ".2",
but the number you see in the pro-
gram mode is not the same number
you will see in work mode. Exit
program mode to see the new read-
13
Proox model 360
version 1.0
ing by holding the "up" and "down"
buttons for three seconds. Repeat
these steps until reading is what it
should be "0.0".
7. Now to set the SPAN. Close
the bleed valve knob then remove the
sensor from the calibration chamber
and let it stabilize in room air. Watch
the sensor's response to immersion
in 21% oxygen in work mode to tell
when it stabilizes. Note whether
oxygen reading is above or below
"21.0" and by how much.
8. Enter program mode,
change the "LEVL" to "3", navigate
to "SPAn" function, and raise the
setting if reading in work mode was
low, or decrease the setting if reading
in work mode was high. Exit program
mode to see new reading. Repeat
until reading is what it should be
"21.0". The number in "SPAn" func-
tion doesn't exactly correspond with
the number in work mode, it is a
coarse adjustment, so use little ad-
justments until you reach "21.0".
Sensor is calibrated when it
reads 0% oxygen after stabilization
in nitrogen and 21% oxygen after
stabilization in room air. Once the
sensor is calibrated, then attach the
sensor to the chamber.
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