Point Four Systems MBD075, MBD300, MBD100, MBD600, MBD900 User Manual

Oxygenation and Water Management Specialists - Making your water better!

MICROBUBBLE OXYGEN DIFFUSERS

USER MANUAL

MAKING YOUR WATER BETTER!

WWW.POINTFOUR.COM

103 - 16 Fawcett Road

Coquitlam BC V3K 6X9

CANADA

Toll Free: 1 800 267 9936

Phone: [phone]

Fax: [phone]

Email: [e-mail]

1

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 O2, supply lines,
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.

2

INSTALLATION

To avoid bubble coalescence, place the
diffuser horizontally and do not obstruct
the surface with protective screens. The
deeper the diffuser is placed in the water
the more effective it will be. Secure
diffuser to a flat surface using "Velcro"
strips, silicone or screws. Do not over
tighten. Use ¼" (6 mm) ID hose and brass
or plastic fittings. Use Teflon tape on
threaded pipe joints. Any number of
diffusers can be connected to a common
supply line. For flow distribution manifolds
and fittings consult your supplier. Supply
pressure must not exceed 50 psi (3.5 bar).
Use a preset pressure regulator (set to 50
psi) and back pressure compensated
flowmeter with needle valve to control flow
Alternatively, but not recommended, if an
adjustable pressure regulator is used to
control now, then this MUST BE USED in
conjunction with a 50 psi pressure relief
valve.

OPERATION

Ensure that the supply pressure at the
diffuser cannot exceed 50 psi (3.5 bar).
Pressurize the diffuser only when
submerged. Turn the gas on and control
flow via the needle valve on flowmeter. If an adjustable pressure regulator is being used
to control flow, ensure that the regulator is in the "Off" position i.e adjustment knob fully
screwed out (anti-clockwise) before turning on the gas supply. Slowly increase pressure
to the desired level, usually 20 to 30 psi (1.5 to 2 bar), by turning adjustment knob
clockwise. There will be a small delay before the diffuser responds to flow adjustments,
especially if the diffuser's air plenum has filled with water.

Brass inlet fittings for MBD600 and MBD300 diffusers