Use
r’s
Manual of OMNI Express Patient Monitor
- 72
037.007.0001 Rev.2
Steady green light
System OK
Blinking green light
Zeroing in progress
Steady blue light
Anesthetic agent present
Steady red light
Sensor error
Blinking red light
Check sampling line
AUTOMATIC ZEROING
The infrared gas analyzer needs to establish a zero reference level for the CO
2
, N
2
O and
anesthetic agent gas measurement. This zero calibration is here referred to as "zeroing".
ISA sidestream gas analyzers perform zeroing automatically by switching the gas
sampling from the respiratory circuit to ambient air. The automatic zeroing is performed
every 24 hours, and takes less than 3 seconds for ISA CO
2
gas analyzers and less than
10 seconds for ISA multigas analyzers.
If the ISA sidestream gas analyzer is fitted with an oxygen sensor, the automatic zeroing
will also include room air calibration of the oxygen sensor.
CLEANING
The “plug-in and measure” ISA sidestream gas analyzers should be cleaned on a regular
basis.
Use a cloth moistened with max 70% ethanol or isopropyl alcohol to clean the analyzer.
To prevent cleaning liquids and dust from entering the ISA gas analyzer through its LEGI
connector, keep the Nomoline sampling line connected while cleaning the analyzer.
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MAINTENANCE
Once every year, or whenever gas readings are questionable, perform a leakage check as
below and verify gas readings with a reference instrument or with calibration gas.
Calibration gas can be ordered from PHASEIN AB (www.phasein.com).
LEAKAGE CHECK
1
. Connect a new Nomoline sampling line with male luer lock to the ISA LEGI and check
that the LEGI shows a steady green light.
2. Connect a short of silicon tubing with an inner diameter of 3/32 (2.4 mm) to the
Nomoline male luer.
3. Exhale a long breath into the silicon tubing until the CO
2
concentration is greater than
4.5 vol % or 34 mmHg.
4. Quickly connect the silicon tubing tightly to the exhaust port.
5. Wait 1 minute until the CO
2
concentration has stabilized. Note the value.
6. Wait 1 minute and check that the CO
2
concentration has not decreased more than 0.4
vol% or 3 mmHg. If it has decreased more there is a major leakage in the ISA unit or in the
[WARNING]:
Since a successful zeroing requires the presence of ambient air (21% O
2
and 0%CO
2
) in the gas analyzer, ensure that the ISA is placed in a well ventilated
place. Avoid breathing near the ISA sidestream gas analyzer before or during the
zeroing procedure.
[WARNING]:
⚫
The Nomoline sampling lines are non-sterile devices. To avoid damage, DO NOT
autoclave any part of the sampling line.
⚫
Never sterilize or immerse the ISA sidestream gas analyzer in liquid.Since a
successful zeroing requires the presence of ambient air (21% O
2
and 0%CO
2
) in
the gas analyzer, ensure that the ISA is placed in a well ventilated place. Avoid
breathing near the ISA sidestream gas analyzer before or during the zeroing
procedure.
