OPERATIONS

1.5NORMAL OPERATION

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.

TELEDYNE ELECTRONIC TECHNOLOGIES

Analytical Instruments

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Teledyne TED 191 instruction manual Normal Operation
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TED 191 specifications

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