DeVilbiss 306DS Service Manual download pdf (Page 11)

LT-2044

Typical New Battery Operation Time

Flow Rate Continuous Flow PulseDose (20 BPM)

1.0 4.0 hours 5.4 hours

2.0 2.4 hours 4.7 hours

3.0 1.6 hours 4.0 hours

4.0 — 3.5 hours

5.0 — 3.2 hours

6.0 — 3.0 hours

NOTE

–Besuretocheckthebatterychargelevelbeforetravel;batterywilldischargeovertime.

Cover

The external plastic cover parts are molded of impact resistant and ﬂame retardant plastic resin and held in place by six T-20 screws.

Compressor

A dual-head compressor creates pressure and vacuum simultaneously and is driven from a single brushless DC motor whose speed is regulated by the

motor control board.

Final Bacteria Filter

The ﬁnal bacteria ﬁlter prevents contaminants from reaching the patient through the oxygen supply.

Intake Silencer/Filter

The intake silencer/ﬁlter ﬁlters the air drawn into the compressor removing particulate matter and reduces the sound of the intake. The silencer/ﬁlter

should be inspected every 3 years and replaced if needed.

Molecular Sieve Beds

Molecular sieve beds contain a synthetic alumino-silicate that attracts and holds nitrogen in a magnetic bond. Two molecular sieve beds work in tandem:

one bed removes nitrogen from the air passing through it while the other bed releases the removed nitrogen back into the room air.

Moisture or hydrocarbons contaminate molecular sieve material causing it to lose its nitrogen adsorbing properties, which in turn decreases the oxygen

concentration. To allow the iGo to exhaust these possible contaminants, anytime the unit is started, it should run for a minimum of 20 minutes before it

is turned OFF.

Motor Control Board

The motor control board controls the motor speed of the DC brushless compressor. The control board also monitors the compressor’s temperature

and speed and communicates that information to the PC board.

Motor Mount System

There are two types of motor mounts used in the iGo: Black rubber mounts connect the compressor to the bracket; spring mounts connect the bracket

to the base of the cover.

Pressure Regulator

The pressure regulator stabilizes the ﬂow of oxygen to the patient and establishes back pressure on the system. It is preset at 5 psi (34.5 kPa) and

should not need adjustment in the ﬁeld.

Printed Circuit Board (PC Board)

The printed circuit (PC) board monitors and controls the operation of the iGo, including cycling pressure and vacuum between the two sieve beds and

initiating visible and audible alerts if abnormal operation is detected. The OSD is located on, and controlled by, the PC board.

Pressure Switch

When the iGo is operating in PulseDose mode, a pressure switch detects inhalation as a reduction in cannula pressure and opens a 2-way proportional

valve that delivers the prescribed bolus of oxygen as the patient begins inhalation. If the pressure switch does not detect a breath at least every 30

seconds, it triggers a No Breath Detected alert. If it does not detect a breath after another minute, it automatically switches the unit into continuous

ﬂow mode.

Purge Valve