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4 Operating Instructions
4.1 Oxygen, Flow and Pressure Measurement
To check oxygen concentration, flow and pressure of a gas sample
from a concentrator:
1. Connect the gas sample tubing to the gas sample inlet of the
Check O
2
Plus.
2. Attach the other end of the gas sample tubing to the oxygen
concentrator.
3. Initiate the flow of gas to the Check O
2
Plus at a rate of
1-10 liters per minute (2 liters per minute is recommended).
Ensure the concentrator’s output is stable per the concentrator
manufacturer’s recommendations.
4. Turn on the Check O
2
Plus.
5. Allow the oxygen reading to stabilize for approximately 10
seconds before reading the oxygen concentration and flow.
6. To check pressure, cover the gas sample outlet with thumb or
finger while gas is flowing.
7. Wait 5 seconds for the display to read pressure.
DO NOT hold the mode button while checking a
concentrator or the reading will be inaccurate.
4.2 Switching Pressure Units of Measure
The Check O
2
Plus can measure pressure in PSI or kPa. The Check
O
2
Plus is factory set to measure in PSI. To switch to kPa:
1. Using a #1 Phillips screwdriver loosen the battery door screw
and remove the battery door.
2. Toggle the switch inside the battery compartment.
3. Replace the battery door and tighten the battery door screw.
4.3 Calibration Verification Procedure
A calibration verification mode is provided to verify that the
Check O
2
Plus is functioning properly. To perform the calibration
verification:
1. Turn on the Check O
2
Plus.
2. Connect a source of pure oxygen (³99.95%) to the gas sample
inlet
3. Flow 2–5 LPM of gas into the Check O
2
Plus. Ensure that the gas
flowing to the Check O
2
Plus is at a stable temperature.
4. Press and hold the mode button. While holding the mode
button, the gas measurement should read between 98.5 and
101.5% oxygen. If the gas measurement is not within this
range, call Customer Service. Calibration verification mode is
indicated by “CAL” and “VER” flashing on screen beneath the
gas measurement.
4.4 Factors Influencing Accurate Readings
Effects of Temperature
The Check O
2
Plus compensates for temperature and will perform
within specifications throughout the operating temperature
range. However, taking measurements during rapid changes in gas
temperature should be avoided.
Effects of Humidity
The Check O
2
Plus has a humidity sensor to detect and compensate
for the humidity of gas entering the device. However, high levels
(condensing) of humidity can affect the accuracy and reliability of the
Check O
2
Plus. To prevent possible damage:
• Avoid usage in environments of greater than 95% relative humidity
• DO NOT use this device in a breathing circuit
• DO NOT breathe or blow into the Check O
2
Plus
10 1176119-A