In order to achieve accurate identifications and measurements, the AGS system requires a warm‐
up period to thermally stabilize. This warm‐up period begins when the AGENT or the CO2
parameter is activated. Upon activation, the AGS system will become fully operational according
to the following sequence:
1. During the warm‐up period, CO2 Warming Up will be displayed.
2. Within 45 seconds of activation, the AGS system will be able to identify the gases and
3. Within 10 minutes of activation, the AGS system will be able to operate at full accuracy.
Zero Reference Adjustment
During Zero calibration the system pulls ambient air through the zero intake port on the cart
The calibration system assumes that the ambient air will contain normal trace amounts of
CO2. If the system is placed in an unventilated area that allows CO2 (from the waste gas port
on the rear panel, if not connected to a gas scavenging system) to accumulate, the result could
be inaccurate CO2 zeroing and resulting inaccurate patient readings. Always place the cart in
a well ventilated area.
The AGS system will occasionally perform a zero reference adjustment, briefly interrupting gas
monitoring to take in room air through a reference gas intake port to ensure the accuracy of the
displayed gas concentrations.
Readjusting CO2 Zero will be displayed during a zero reference adjustment; allow the process to
complete. A zero reference adjustment typically takes 10–12 seconds, and will occur
automatically as needed, but mostly during the warm‐up period. When the AGS system has
become fully operational, these adjustments will occur approximately once every 4 hours or
whenever the AGS system temperature changes by at least ±1°C from the last stored stable
9‐2 Monitoring Agents and Gases (AGENT Option)
Organic vapors (for example, from cleaning agents) in the sampling line or room air
may alter anesthetic agent readings.
Alcohol in the patient's breath can modify the anesthetic agent readings.
provide gas concentration information with ISO‐level accuracy. Wait during this period, the
measurement numeric values in the AGENT, GAS, and CO2 VS boxes will display three
dashes (‐ ‐‐ ); see No Data Indication on page 2‐20 for details.
Expression MR400 Instructions for Use