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ESO 2 ICU Ventilator 22 User Manual
Description: Oxygen Monitor
3.6 Oxygen Monitor
The oxygen monitor continuously measures and indicates the
concentration of oxygen in the breathing system, and triggers
an alarm when the concentration varies from the set levels.
3.6.1 System Description
The oxygen monitor uses a fast-responding, oxygen-specific,
self powered sensor that achieves 90% of final value in less
than 10 seconds.
An sensor (1), is fitted to the breathing module and is supplied
with a cable.
The system has user-adjustable high-level and low-level
alarms with visual and audible indication of alarm conditions.
Bacterial Filter
Always use a breathing system bacterial filter in the expiratory
limb of the breathing circuit to protect the oxygen sensor
and breathing system components from contamination (see
section 4.1.6.
Replacement/Disposal - always follow the instructions
supplied with the filter, and always replace at the
recommended interval.
3.6.2 The Oxygen Sensor
The oxygen sensor provides quick response, linear output over
the entire 0 - 100% oxygen range, and long service life.
The sensor is a self-powered galvanic cell that generates a
current proportional to oxygen concentration.
The cell has a highly stable output over its operating life.
Significant output loss is only shown at the very end of its life.
Typical sensor drift rates are less than 1% per month when the
sensor is exposed to gas in typical applications.
Sensor life:
Sensor life is approximately 1500 000 O2% hours at 20°C
(minimum one year in most normal applications).
Sensor lifetime is governed by the mass of lead available to
react with the oxygen and its rate of consumption. High oxygen
partial pressure and high temperature will increase the sensor
output current, thus shortening the operation life.
At the point where all lead has been consumed, the output will
fall very quickly to zero over a period of two to three weeks.
3.6.3 Oxygen Monitor Menu
Select: O2 MONITOR ‘on’
To access Calibration and Alarm Set functions, the monitor
must first be set to ‘on’ in the sub menu (1).
Scroll to O2 MONITOR, rotate the wheel to ‘on’, press the
wheel to confirm.
NOTE
1. The oxygen monitor defaults to the previous values for
high and low alarm settings.
1
O2 Monitor & Spiro
ESCAPE FROM MENU
>
O2 MONITOR: on
CALIBRATION: 100%
HIGH ALARM SET: 105
LOW ALARM SET: 18
SPIROMETER: on
SPIRO CALIBRATION: 0 L/min
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