FREQUENTLY ASKED QUESTIONS (continued)
When I am in the Concentrator Mode and hook the unit up to a U.S.P.
oxygen(
>
99.0%) source the LCD does not read 99% (± 2), why?
When the unit is in its default (concentrator) mode the device's
software enables the unit to measure the output of an oxygen
concentrator by compensating for the argon that passes through the
sieve beds. In this mode, it will display a false reading (usually ±
90%) if connected to an oxygen source other than a concentrator.
Pressing and holding the
“pure O
2
/calibrate”
button removes the
argon compensation and allows the device to measure the oxygen
purity with ±2% of compressed gaseous or liquid oxygen.
When I am in the Concentrator Mode and hook the unit up to a
U.S.P. oxygen (> 99.0%) source the LCD the display reads -
"Concentrator O
2
91.8" (approx). What's wrong?
Nothing. When in the Concentrator Mode, the electronic
components of the indicator automatically compensates for the argon
found in the gas produced by an oxygen concentrator. As a result
the display will read approximately 90% unless this function is over-
ridden by pushing the
“pure O
2
/calibrate”
button.
Whenever I check concentrators with the Respond
O
2
™
, I
consistent get an O
2
concentration reading of 96.0 on every
concentrator. Why?
Concentrators work at their maximum efficiency (96.0%) at lower
flow rates. When the flow rate is increased the output of the
concentrator typically will decrease slightly. If you question whether
the device is functioning properly, stabilize it to room air and then
retest with the concentrator set on the maximum flow rate or beyond.
Be sure to allow the concentrator to stabilize at the higher flow rate
before testing. This may take as long as 10 minutes.
Will the unit lose calibration when I change batteries?
No. The unit holds calibration even when the battery is removed.
12
Ultrasonic Oxygen Indicator
FREQUENTLY ASKED QUESTIONS
The following are some of the frequently asked questions about the
operation of this device.
Do I have to calibrate my Respond
O
2
™
unit daily?
No. The
Respond
O
2
™
indicator was calibrated at the factory.
How do I know that my Respond
O
2
™
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 OB
2B
/calibrate”
button. As long as
the display reads between
99% and 101%
, the unit is properly
calibrated.
How often should I calibrate my Respond
O
2
™
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 Respond
O
2
™
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.
11
Ultrasonic Oxygen Indicator
