Teledyne AX300-I - Medical application oxygen analyzer - Manual (Page 22)

Operating Instructions AX300-I
Teledyne Analytical Instruments
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 In confined volumes such as in incubators or tents.
When analyzing for oxygen in breathing systems, the flow diverter must be
used. The diverter should be screwed onto the threaded front end of the
R17MED sensor. A tee adapter (plastic, P/N A268, or metal, P/N A283) should
be placed into the breathing loop, and the above sensor assembly plugged into
the tee adapter. See Figure 2-3.
CAUTION: CHECK THE BREATHING SYSTEM FOR LEAKS. BE CERTAIN THAT
THE SYSTEM DOWNSTREAM OF THE SENSOR DOES NOT PRO-
DUCE ANY BACKPRESSURE OR RESTRICTION TO FLOW. ER-
RORS IN READINGS WILL RESULT IF THIS IS NOT FOLLOWED.
THE OXYGEN SENSOR IS A NON-STERILE DEVICE AND SHOULD
BE USED IN CONJUCTION WITH AN ANTI-BACTERIAL FILTER. AL-
WAYS INSTALL THE SENSOR ON THE INSPIRED LINE AHEAD OF
FILTERS, HUMIDIFIERS AND MEDICATING DEVICES. NEVER IN-
STALL THE SENSOR IN A LOCATION THAT WILL EXPOSE THE
SENSOR TO PATIENTS’ EXHALED BREATH OR SECRETIONS UN-
LESS YOU INTEND TO DISPOSE OF THE SENSOR AND FLOW
ADAPTER AFTER USE.
When analyzing for oxygen in confined volumes such as incubators, hoods,
etc., the flow diverter must be removed from the R17MED sensor so that it does
not interfere with the rapid exchange of gases to and from the sensing surface of
the sensor. Failure to remove the diverter in these applications may adversely
affect the response time of the sensor.
The R17MED sensor can be placed or hung inside incubators, tents, etc.
When it is necessary to thread the cable through a small hole in order to gain
access to the inside of a chamber, the cable should be disconnected at the sensor,
threaded through the hole, and reconnected inside the chamber.
2.3 Factors Affecting Sampling Accuracy
2.3.1 Humidity
Humidity does not directly affect the accuracy of the sensor's measurement.
However, when a nebulizer or other device is used to increase moisture levels in
gas mixtures, the moisture actually dilutes the mixture. This dilution effect de-
creases the oxygen concentration. Your portable oxygen analyzer accurately
measures the decreased oxygen concentration.
As with all diffusion based oxygen sensors, excessive condensation on the
sensing surface of the R17MED will block the diffusion of oxygen to the sensor,
rendering it inoperative. We recommend installing the sensor on the dry side of
the breathing system at all times.