Portable Oxygen Monitor OPERATING & SERVICE INSTRUCTIONS MX300-I

Operation MX300-I
Teledyne Analytical Instruments 26
R17MED sensor so that it does not interfere with the rapid exchange of
gases to and from the sensing surface of the sensor.
CAUTION: FAILURE TO REMOVE THE DIVERTER IN THESE
APPLICATION AREAS WILL RESULT IN A MARKED
LOWERING OF 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.
The LOCK/UNLOCK key can be used to lock out any accidental
interference to the front panel keys. The LOCK/UNLOCK key acts as a
toggle, pressing LOCK/UNLOCK once renders inactive all keys except
the ALARM SILENCE () and BATT TEST keys. Pressing
LOCK/UNLOCK a second time unlocks the keypad.
2.3 Gas Sampling
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 decreases the oxygen concentration.
For example, if an 80% oxygen gas mixture is humidified to
saturation at room temperature, the resulting gas mixture will contain
only 77.5% oxygen. Your portable oxygen monitor accurately measures
decreases in the oxygen concentration due to the dilution effects of
moisture added to gas mixtures.
As with all 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 circuit at all times.