Point Four Systems MBD075 User Manual page 2

INSTRUCTIONS FOR USE
Safety Precautions and Good Practice
It is essential that distributors ensure users of the Point Four diffusers are
informed both verbally and in writing about the safe and correct use of diffusers.
WARNING: THE DIFFUSER MUST ONLY BE OPERATED WHEN SUBMERGED.
When the diffuser is under pressure substantial potential energy is stored in it. Should
the porous ceramic fail due to over pressure it may burst with possible injury to anyone
close by if the diffuser is not submerged.
WARNING: USING OXYGEN
Oil, grease and other hydrocarbons when combined with oxygen, become highly
combustible and should never be used on any part of the oxygen cylinder, valve,
regulator, diffuser fitting or other equipment used with oxygen. If using O
regulators, flowmeters etc. must be CLEAN FOR OXYGEN SERVICE
 Use of pressure regulators and flow meters. Wherever possible use a pre-set
pressure regulator, pre-set to 50 psig (345 kPa), in conjunction with a flowmeter. A
flowmeter is highly recommended in almost all cases. Use only rotameter type
flowmeters (floating ball in a tube).
Do not use an adjustable regulator with bourdon gauge flow indicator. Because of
back pressure (25 to 35 psig) in the supply line to the diffusers, the indicated flow will
be wrong and very misleading, and may even result in over pressuring of the diffuser.
 Use Pressure Relief Valve in the gas supply line if an adjustable regulator is
used. It is strongly recommended that a pressure relief valve be installed just after
the pressure regulator to protect the flow meter and diffuser/s from over
pressurization- use 55 or 60 psig rated pressure relief valve.
 Water in diffuser. If the diffuser is left submerged with no pressure applied to it water
will seep through the porous ceramic and enter the air plenum. To prevent this from
happening, turn on the oxygen and apply a slight pressure to the diffuser as the tank
begins to fill with water. Once the diffuser is pressurized, the oxygen can be turned
off. If water does enter the air plenum, it will be forced out by the oxygen but it will
take several minutes for an even bubble pattern to form.
• DO NOT allow diffusers to become contaminated with oil.
• AVOID physical shock.
, supply lines,
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