PNEUDRI MiDAS - Mini Dry Air System
The problem
Compressed air is an essential power source that is widely
used throughout industry. This safe, powerful and reliable
utility can be the most important part of your production
process.
However, your compressed air will contain water, dirt, wear
particles and even degraded lubricating oil which all mix
together to form an unwanted condensate. This condensate
often acidic, rapidly wears tools and pneumatic machinery,
blocks valves and orifices causing high maintenance and
costly air leaks. It also corrodes piping systems and can
bring your production process to an extremely expensive
standstill!
The use of high efficiency compressed air filters fitted with
condensate drains will remove the oil, water and dirt
particles to eliminate the abrasive sludge in the
compressed air system.
In many cases this action alone is not enough, as modern
production systems and processes demand an even higher
level of air quality. Where required, “point of use” desiccant
air dryers can provide the correct air quality, without the
need for drying the complete compressed air installation,
which can be both costly and totally unneccessary.
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Optional Features
■ For totally quiet operation, the regeneration
exhaust air can be positively piped away.
■ Remote indication provides a warning of the
dryers need for servicing. (Audible alarm not
included
■ Wall mounting kit for vertically securing the
dryer to a wall or canopy
A 45° tilt, wall mounting kit is also available
for vertically securing the dryer to a wall,
canopy or inside a customers product where
access to the top of the dryer is restricted.
■ In conditions of limited access, the electronic
control box (base) can be detached and
relocated remotely from the dryer |
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Operation
1 Compressed air enters the integral pre-filter
and passes into the left hand chamber
(Column A) where the air is dried before
passing to the application.
A small amount of dry purge air is used to
regenerate the right hand chamber (Column
B) which is wet, using the PSA (Pressure
Swing Adsorption) method of regeneration,
venting the saturated air to atmosphere
under pressure. The same regeneration air is
also used to “back flush” the integral filter
to prolong its working life.
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2Prior to changeover, the right hand chamber
(Column B) enters repressurisation where
the exhaust valve is closed to allow pressure
to increase. This process ensures a smooth
uninterrupted changeover, preventing the
loss of any system pressure, before the
process repeats itself.
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The efficient solution
The domnick hunter PNEUDRI MiDAS range of desiccantair
dryers, offers the user uncompromised performance from a
dedicated “point of use” Clean Dry Air system. It is easy to
install and will transform an ordinary process into a highly
reliable and efficient production operation.
PNEUDRI MiDAS has been designed with “quick change”
filter, dryer combi-cartridges and in-line air connections
to facilitate easy maintenance.
PNEUDRI MiDAS totally cleans and dries compressed air
down to –40°C (–40°F) pressure dewpoint, meeting the
requirements of ISO 8573.1 Class 1.2.1 as standard.
For critical applications, a pressure dewpoint of –70°C
(–100°F) ISO 8573.1 Class 1.1.1 is achievable.
The principles of PNEUDRI MiDAS are based upon well proven
concepts which embody true innovation and excellent value
for money with technically superior yet simple design, while
leading the way in compressed air drying.
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The Benefits are obvious
■ Point Of Use Application.
Bringing Clean Dry Air just where you need it.
■ Approved to International Standards.
Designed in accordance with ASME VIII Div.1, approved t
CSA/UL/CRN and fully CE Marked (PED, EMC, LVD) as standard.
■ Simple to install.
Flexible installation utilising the multiple in-line inlet & outlet
connection ports.
■ Compact and lightweight.
Can be Floor, Bench or Wall/Canopy mounted.
■ Very Quiet Operation.
Noise level less than 70dB(A).
■ Can be installed almost anywhere.
IP66 / NEMA 4 protection as standard.
■ Audible alarm.
Indicating Service interval for optimal performance.
■ Simple & easy to maintain.
A 100% service can be achieved insitu in under 15 minutes
due to the quick release top cap arrangement, which does NOT
require the inlet / outlet ports to be disconnected as with
traditional systems.
The PNEUDRI MiDAS Dry Air System, is the reliable, cost
effective and flexible way to provide Clean Dry Air exactly
where needed.
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Product Applications
PNEUDRI MiDAS will benefit users who have a
specific need for Clean Dry Air (CDA) directly
after a compressor, or for a particular
application where the air is critical to the
operating process or end product.
Typical applications:
■ Computer Numerical Control (CNC) Machines
■ Co-ordinate Measuring Machines
■ Laboratories
■ Lasers
■ Packaging Machines
■ Instrumentation
■ Processing equipment
■ Conveying Machines
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Service Indication Sequence & Alarm
During operation, PNEUDRI MiDAS Power On (yellow)
LED and Check (Green) LED indicators will illuminate,
remaining in this configuration for 11500 hours. At
this time, the Warning (Yellow) LED will illuminate and
cancel the Check (Green) LED. This signals the user to
order service replacement components at the optimum
time.
500 hours later (a total of 12000 hours from initial
start up) the Service (Red) LED will illuminate and
cancel the Warning (Yellow) LED, the Audible Alarm
housed inside the display will sound intermittently
(every 6 seconds) drawing attention to the need for a
service.
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Selection Criteria
To correctly select the dryer best suited for your application, the
following details are required to ensure optimum performance and
trouble free operation.
■ Maximum Inlet Flow
■ Minimum Inlet Pressure
■ Maximum Inlet Temperature.
Once these operating parameters have been established, you can
select the most economical PNEUDRI MiDAS for your application.
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Example
Selecting a dryer for a compressor producing, at full load 13.6m3/hr (8cfm) at
6 bar g (87psi g) with 35°C (95°F) air inlet temperature and
a pressure dewpoint requirement of -40°C (-40°F).
Step 1
From the sizing chart select the required pressure @ 6 bar g (87psi g) and read across
to the required inlet temperature @ 35°C (95°F). The Correction Factor is 0.88
Step 2
To adjust the flow for your application, divide the required flow by the 0.88 Correction Factor
Example: Sizing Capacity = Actual Flow 13.6m3/hr (8cfm) = 15.5m3/hr (9cfm)
Correction Factor 0.88
Step 3
From the Model Selector, select the dryer which has a rated flow capacity of 15.5m3/hr (9cfm)
or higher.
Selected model for this example is a PNEUDRI MiDAS DAS 4.
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