91518 Multigas Analyzer Service Manual
4-3
Maintenance
If the water trap is not empty, follow the hospital safety procedures for handling possibly contaminated
material, and replace the water trap (refer to
Warning:
The used water trap may contain hazardous fluids and should be disposed of in accordance with
hospital procedures.
Initialization
When the multigas analyzer is powered ON, the message SENSOR WARMING UP will display for up to two
minutes, depending on the temperature of the multigas analyzer bench. Within two minutes, the SENSOR
WARMING UP message is replaced by the AGENT WARMING UP message on the prompt line. The AGENT
WARMING UP message will remain on the prompt line for up to three minutes.
The CO
2
waveform will be available only when the SENSOR WARMING UP message has disappeared.
After the warm-up periods, the GAS - SENSOR STABILIZING message displays on the prompt line for
approximately 30 minutes.
After the gas sensor has warmed up, the SENSOR WARMING UP message disappears, and the message
AUTO ZERO IN PROGRESS displays. A flat waveform displays at the zero baseline during zero calibrations.
During the warm-up periods or stabilization period, the multigas analyzer may perform one or more zero
calibrations.
Figure 4-1: Gas sampling line and gas sampling tee
1 After the SENSOR WARMING UP message has disappeared, and zeroing is not in progress, breathe
through the sampling tee for five slow breaths. If you don’t want to make contact with the sampling tee, cup
the tee in curled fingers, and breathe through your fist.
2 Verify that the waveform rises and falls accordingly. The numerics should display FiO
2
, FeO
2
, I CO
2
, and
ETCO
2
values. For the rest of the parameters question marks will display.
This completes the functional performance check. If the check passes, proceed with the preventive
maintenance. If the check fails, corrective maintenance is necessary.
