2
check
®
Ultrasonic Oxygen Indicator
FREQUENTLY ASKED QUESTIONS
Thank you for purchasing the PRO
2
check
®
Ultrasonic Oxygen Indicator.
It
will give you years of trouble-free operation. The following are some of
the frequently asked questions about the operation of this device.
Do I have to calibrate my PRO
2
check
®
unit daily?
No. The
PRO
2
check
®
indicator was calibrated at the factory.
How do I know that my PRO
2
check
®
device is accurately
measuring concentrations?
To verify, simply connect the unit to a source of either compressed gas or
liquid U.S.P. oxygen (> 99.0%) at 2 LPM. Then turn on the device and
hold down the “pure O
2
/calibrate” button. As long as the display
reads between 99% and 101%, the unit is properly calibrated.
How often should I calibrate my PRO
2
check
®
unit?
As long as you can verify (via the Pure Oxygen Verification Procedure)
that the unit is holding calibration against a U.S.P. oxygen (> 99.0%)
source, the unit does not require calibration.
My accreditation organization as well as our internal policies require
periodic calibration of this type of equipment. Can I calibrate the PRO
2
check
®
device to comply with these requirements?
Yes, if accreditation organizations or internal policies and procedures
require routine calibration, instructions on calibrating the device are
found on pages 6 - 7 of this manual.
Does the unit have to be turned off before verifying or calibrating?
Yes. The unit must be turned off and evacuated to room air before you
begin the oxygen verification or calibration procedures.
Why doesn't the unit drop immediately to room air?
Oxygen is heavier than room air, so it will linger inside the unit. When
there is a flow (either from room air or another concentrator), the reading
will change immediately.
Can I exhale (blow) into the unit to reach room air?
No. You may apply a small suction or flow of room air, but do not exhale
into the unit.
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