NomoLine ISA Service Manual Chapter 2: Maintenance Procedures
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ISA AX+ and OR+
The surfaces of the ISA AX+ and OR+ devices may be cleaned with the following solution(s):
• 70% ethyl alcohol
• 70% isopropyl alcohol
Operational Check
The Operational check includes a Capnogram check and an Occlusion check. The Operational
check shall be performed according to the following procedure before the ISA device is taken
into operation or as part of troubleshooting.
1. Connect the ISA device cable to the host device connection port.
2. Connect a NomoLine sampling line to the input connector. See NomoLine ISA
CO2/AX+ Interface on page 11 or ISA OR+ Interface on page 12.
3. Power up the host device.
4. Check that the LEGI indicator shows a steady green light, indicating that ISA
device is ready for use. See LEGI Indicator on page 13.
Note: Without a sampling line connected, the LEGI Indicator does not illuminate.
5. Breathe briefly into the sampling line and check that a valid CO
2
waveform and
values are displayed on the host device screen.
6. Occlude (obstruct) the sampling line and wait for 10 seconds.
7. Check that an occlusion alarm is displayed and that the LEGI connector shows a
flashing red light.
Zeroing
NomoLine ISA CO2
The highly stable NomoLine ISA CO
2
spectrometer requires no regular zeroing. A room air
reference measurement is performed when the NomoLine is disconnected from the LEGI
connector, provided that CO
2
measurements are stable. This zeroing procedure is indicated by
the LEGI blinking green. See LEGI Indicator on page 13.
ISA AX+/OR+
The ISA gas analyzer needs from time to time to establish a zero reference level for the gas
measurements and the flow. The zero calibration is here referred to as “zeroing".
The ISA performs zeroing by switching the gas sampling from the respiratory circuit to
ambient air. The automatic zeroing is performed 1 to 3 times per day, and takes less than 10
seconds to perform.
During zeroing, if the exhaust gas is returned to the patient circuit, the returned gas level will
be different from the gas level at the sampling site.
The zeroing procedure is indicated by the LEGI blinking green. See LEGI Indicator on page 13.
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