Expression MR400 Instructions for Use
Allow the AGS system to run and sample room air for at least 1
minute. The FiO2
approximately 21 percent.
If the reading remains outside this range for more than 1 minute
after first checking the reading, replace the oxygen sensor as
described in chapter 14.
After allowing the AGS system to run for at least 1 minute, pinch or
seal the input line (to the water trap) for 5 seconds and verify that
Occlusion is displayed.
If this message does not appear, check all tubing connections for
leakage and retest.
Always test sampling line adapter for a tight connection and proper operation before
attaching to a patient. Over-tightening the sampling line connection may damage the
water trap. Tighten the sampling line connector no more than one half-turn. Over-
tightening this connector can cause failure of the water trap assembly and inaccurate
patient gas measurements.
Inspect water trap and AGENT accessories before use. If the sampling line, connector
or sample port show signs of damage, replace the part immediately or discontinue use
and contact technical support. Never use damaged equipment.
Frequently inspect the patient sampling line and keep it clear of any moving
mechanisms (for example, table wheels) which could cut, pinch, or dislodge the patient
tubing. Avoid kinking of the patient sampling line as leaks, reduced or stopped flow, or
internal venting of sampled gas into damaged tubing will cause inaccurate
Do not position the sampling line in any manner that may cause entanglement or
Replace the sampling line if excessive secretions are observed, as inaccurate
measurements could result if the flow is reduced or stopped.
Leakages in the breathing system or sampling system may cause the displayed
AGENT, CO2, O2, N2O values to be too low. Always connect all components securely
and check for leaks according to standard clinical procedures. Displacement of the
nasal cannula or patient airway adapter can cause lower than actual readings.
If AGENT, CO2, O2, N2O values for patients who are not on a breathing circuit
appear extremely low, check whether the patient is breathing through the mouth or
whether one nostril is blocked.
reading displayed in the GAS VS box should be
Monitoring Agents and Gases (AGENT Option) 9‐9