Performance Assurance Tests - Checking and Calibrating the Gas Analyzer
4 Testing and Maintenance
59
Zero Calibration
Figure 9 Zero Calibration
The IntelliVue G1 and G5 require a periodic zero calibration. Whenever this is due, the instrument
sends a zero request command to the host monitor. The Philips patient monitor automatically initiates
a zero calibration whenever it receives such a request from the gas analyzer - if you want the VISIA tool
to do the same, you have to switch the zero mode from Manual to Auto (see Figure 9).
Zero requests occur 5 and 10 minutes after power on and then every two hours.
You can also initiate a zero calibration manually by pressing the Zero button.
A zero calibration can either be run on selected gas channels only or on all necessary channels. The
latter is recommended and therefore the
All Nec
. check box should always be checked in the Zero tab.
Zero Calibration Test
Test Procedure:
• Make sure that the
All Nec
. check box is checked in the Zero tab
• Press the
Zero
button. Note that the Mode in the Zero tab must be switched to
Manual
for this test.
Do not forget to switch it back to
Auto
upon completion of the test.
Expected Result: a “Zero successful” message in the lower right hand side of the Zero tab and only
green soft-LEDs in the Zero Status area.
If this test fails, perform a Leak Check and a Flowrate Check and rerun the Zero Calibration Test. If it
fails again, the gas analyzer needs to be replaced.
