Technical Service Manual PM2300 Series Liquid Oxygen Reservoir

1.0 Theory of Operation
The EasyMate Reservoir is intended to provide supplemental oxygen to the long term oxygen
patient up to 24 hours per day in an efficient easy to use package utilizing XXXXXXXXXXXXX’s
unique thermal liquid level sensor system.
When used in conjunction with the EasyMate PM2200 Liquid Oxygen Portable the EasyMate
PM2300 Liquid Oxygen Reservoir provides the most efficient, reliable and state of the art
ambulatory LOX system available.
While at home, the patient can receive continuous flow oxygen from the EasyMate Reservoir via
a Flowmeter (P/N 1MFA1863) or a Dial Flowmeter (P/N PM2300FCV) or by filling (as per the user
manual) their portable LOX unit (EasyMate Portable PM2200 Series) and ambulate in or away
from their home without having to connect to the EasyMate Reservoir.
Liquid oxygen stored in the EasyMate Reservoir is typically saturated and boiling at a temperature
somewhere between about -277°F (-172°C) and -265°F (-165°C). The constant transfer of heat
from the atmosphere into the EasyMate Reservoir keeps the liquid oxygen boiling and vaporizing
into gas. If the heat energy transferring into the liquid oxygen is not controlled, vaporization
occurs too rapidly, and excess oxygen is vented to the atmosphere and wasted. The cryogenic
container is designed to minimize the transfer of heat from the atmosphere to the liquid oxygen
contents. This is done by slowing the transfer of heat energy.
Gaseous oxygen is produced in two ways within the EasyMate Reservoir. First by the normal
evaporation rate boiling off the LOX and generating head pressure, until relief valve pressure is
reached, where it vents off to the atmosphere. Secondly, by vaporization within the warming coil
by allowing LOX to be pushed up the capillary tube and into the warming coil. This is controlled
by the economizer valve.
When filling a portable the head pressure pushes the LOX up the withdrawal/fill tube and out the
fill connector when its VTF Valve is opened.
When not in use the EasyMate Reservoir will eventually empty by venting off gaseous oxygen to
the atmosphere continuously at a rate equal to the containers NER value, about 1.35 lbs. per day.
2.0 Warnings and cautions
WARNING
This equipment is not intended for use by patients who would suffer immediate, permanent,
or serious health consequences as a result of an interruption in the oxygen supply.
• DO NOT smoke in an area where oxygen is being used or stored.
• DO NOT disassemble or repair the EasyMate Reservoir, this could create a hazardous condition
or cause equipment failure. If you have problems, questions, or are unsure if equipment is
operating properly, call your Liquid Oxygen Supplier.
• DO NOT use if dirt or contaminants are present on or around fill connectors on the Portable
or EasyMate Reservoir.
• DO NOT use oils, greases, lubricants or any combustible materials on or near the EasyMate
Reservoir. Wash hands properly prior to usage.
• DO NOT touch liquid oxygen or parts that have been in contact with liquid oxygen. Liquid oxygen
is extremely cold (-297°F/-183 °C). When touched, liquid oxygen, or parts of the equipment that
have been carrying liquid oxygen, can freeze skin and body tissue. Fill the EasyMate Reservoir
with only Medical Grade Liquid Oxygen. (USP applies only in the United States)
PM2300 Series Liquid Oxygen Reservoir
Technical Service Manual
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