14
TELEDYNE ELECTRONIC TECHNOLOGIES
Analytical Instruments
SECTION TWO ANAESTHETIC AGENTS
2. ANAESTHETIC AGENTS
The anaesthetic agents listed in the following table (Halothane, En flurane, Isoflurane Sevoflurane,
and Desflurane) were vaporised into a stream of 30%oxygen / 70% nitrous oxide. The resultant
drops in displayed oxygen concentration after a 2 hour ex posure period were observed.
Exposurers in excess of 2 hours will provide marginally greater error s. The errors listed are typical
for all gas permeable membrane oxygen sensors.
Exposure of the sensor to gas, free from any anaesthetic contamination, f or a period of equal or
greater than the exposure period, will eliminate the measurem ent error in most instances.
Gas or Vapor Level
(Balance : Mixture of 30% O2 / 70% N2O, except where noted)
Gas or Vapor Test Level Oxygen Reading Error
Helium 50%, balance O20%
Nitrous Oxide 80%, balance O20%
Carbon Dioxide 10%, balance O20%
Halothane 4% < -1.5% O2
*
Enflurane 5% < -1.5% O2
*
Isoflurane 5% < -1.5% O2
*
Sevoflurane 5% < -1.5% O2
*
Desflurane 15% < -1.5% O2
*
*Errors are approximate and may vary based on exposure times and concentrations. These
performances meet or exceed the requirements of ISO 7767: 1997 (E)
Caution: The TED 191 Portable Oxygen Monitor should not be used in the presence of
flammable anaesthetics such as diethal ether or cyclpropane.
The T-7 oxygen sensor should not be left in nitrous oxide mixtures any longer than absolutely
necessary. After exposure to nitrous oxide mixtures, the sensor should be l eft in 100% oxygen
overnight (e.g. left in a breathing circuit that has been flushed with pure ox ygen). If the oxygen
reading continues to drop after each use in nitrous oxide, the sensor should be removed from
service. If the sensor can no longer be calibrated, or if there is any sign of electr olyte leakage, the
sensor should be disposed of in accordance with local regulations and the specific guidelines as
given in the Material Safety Data Sheet of the sensor.