INSTRUCTION MANUAL PORTABLE OXYGEN MONITOR TED 191

TELEDYNE ELECTRONIC TECHNOLOGIES

Analytical Instruments

PERATIONS

1.5 N

ORMAL

PERATION

Switch the instrument on using the On–Off Switch.

Validate the calibration of the instrument by exposing the oxygen sensor to room air, and

verifying that the display on the instrument reads 100% (± 2 %). A further check can be

carried out by exposing the sensor to a stream of 21% oxygen, and verifying that the display

on the instrument reads 100% (± 2 %).

Should this validation procedure indicate that the instrument is out of calibration, follow the

calibration procedures set out in 1.4 above.

Once the calibration of the instrument has been verified, place the sensor tip within the

stream of gas (e.g. breathing circuits) or the localised environment (e.g. incubators or

oxygen tents) that requires to be monitored.

It is highly recommended that a flow diverter be used when monitoring a dynamic gas

stream. This will prevent sample stagnation, and create a vortex effect that will facilitate a

more accurate continuous assessment of the gas stream being monitored. The flow

diverter should be plugged into a T-adapter, which must be located in line.

Note: Check the breathing circuit for leaks. Ensure that the circuit downstream of the

sensor does not produce any back-pressure or restrictions of the gas flow, or

errors in the readings will result.

When using the instrument in a static environment, such as in an incubator, the flow diverter

should be removed so that it does not interfere with the rapid exchange of gases through

the gas permeable membrane of the sensor cell. When it is necessary to thread the cable

through a small hole in order to gain access to the inside of the chamber, the instrument

should be switched off, the cable should be disconnected at the sensor, threaded through

the hole, and reconnected inside the chamber (see1.3 above), before commencing as

described above.

Note: Failure to remove the flow diverter will result in the marked slowing of the

sensor response time.

The instrument will display the measured oxygen concentration. The high and low alarms

should be set as detailed in 1.6 below.

When using the instrument in the presence of anaesthetic agents, it is possible for the

measured value to reflect a fall. The magnitude of this fall is related to the level of oxygen

concentration and the duration of the exposure to the anaesthetic agent. See 1.7 below for

further details.