User Manual

Table Of Contents
ExpressionMR400InstructionsforUse MonitoringAgentsandGases(AGENTOption)93
Note
Whenever the Agent sensor changes from a steady state condition, the system will perform an zero
reference adjustment to restabilize the sensor readings. During this time it is possible for a false
identification and concentration value to occur. Change from a steady state condition may occur
when:
Applying a sampling line for the first time.
Switching from one agent to another.
Going from high agent concentrations to low or off.
Note
During the first hour after the system has been turned on and flowing oxygen greater than 50
percent, the CO2
waveform periodically baselines to complete reference measurement; however,
the measurement numeric values remain. Once the system reaches ambient temperature this
condition will cease to occur.
Toperformamanualzeroreferenceadjustment
Breath Rate Distortion
Theeffectofrisetimedistortiontothegascurvebecomesapparentwhenthebreathingrate
increasessothat thetimeforafullinspiratoryorexpiratoryeventgetsshorter.Inthose
situations,duetotheeffectoftherisetime, thegascurvedoesnotreachthetrueendtidal
(or
firstinspiredvalue)andtheendtidalgasvaluemaythenbeunderestimated.Correspondingly,
thefirst inspiredvaluemaybeoverestimated.Belowisanexaggeratedillustrationoftheeffect.
Step Action
1 SelecttheCO2VSbox.
TheCO2menuappears.Currentsettingsaredisplayed.
2 SelectZeroCal.
Allowtheprocessto
complete,typically10–12seconds.