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Operational Description for Oxygen Monitoring System
This portion of the manual is effective for configuration models 1373-31103 and 1373-
71103 which are equipped with an Ultrasonic Oxygen Monitoring System. This is effective
with for Oxygen Monitor equipped units beginning with serial number 98219700.
The Oxygen Monitor is an electronic module that continuously monitors the actual
concentration of O2
supplied by the
MARK 5 PLUS
concentrator. The Oxygen Monitor
detects concentrations of 85
%
or below and triggers a visible and audible alarm. The
Oxygen Monitor is available as an option. The Oxygen Monitor module reinforces and
relays the standard operating alarms on the concentrator.
When powering on the
MARK 5 PLUS
the Oxygen Monitor module operates as below.
- In addition to the normal test of the
MARK 5 PLUS,
the Oxygen Monitor red indicator
light
comes on.
- The red indicator light may remain on for a few minutes (3 minutes maximum), which is
the time necessary for the gas concentration supply to reach and exceed 85% O
2
.
-
The green indicator light comes on after this value is reached and the concentrator is then
operating satisfactorily.
Operating principle
The oxygen monitor module is an electronic module that continuously monitors the oxygen
enriched product that is actually supplied to the user.
The sensor, which utilizes the principle of sound velocity as a function of molecular weight,
measures the velocity of sound in the product gas and compares it to stored values which
correspond to the oxygen concentration. The preset threshold value is 85% for 115 volt
devices.
A red light indicates a concentration below the preset threshold level. When the light is red
for 15 minutes (
±
2 minutes) a continuously audible alarm is activated.
The oxygen monitor module incorporates a 9V transformer, a pressure sensor, the oxygen
sensor, a 9V battery, red and green LEDs, the alarm buzzer and associated electronic
circuits.
Other alarms
Detection of absence of line voltage. In the event of a powerline cut, a continuous audible
alarm is triggered (and the green LED goes out). The power supply for the alarm is a 9V
battery.
Operating fault:In the case of a distribution malfunction (pressure of oxygen enriched air <
4 psig or > 20 psig) an audible alarm and visual alarm is triggered (red LED and
continuous audible alarm).
Summary of Contents for 1373-3111 OT
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