International Dealer News IDN 147 February/March 2019 | Page 33
road trip
airflow, improved sealing surface, removal of the
restrictive backfire screen and ease of service”.
While manufacturing precision and quality control is
at the heart of the Twin Air operation, the R&D and
testing are the brains. Twin Air meets and exceeds the
requirements of several of the applicable stringent
ISO tests, starting with ISO-5011 ‘Inlet Air Cleaning
Equipment’ for internal combustion engines and
compressors - ‘Performance Testing’.
The ISO standard establishes and specifies uniform
test procedures, conditions, equipment and a
performance report to permit the direct laboratory
filters is plotted to help future design development.
With all the ISO test procedures required, Twin Air
constantly checks and monitors their materials and
procedures in-house in their own test laboratory -
both before manufacturing and their finished
products (once assembled) - to ensure that every
batch made and sold is fully compliant.
Dust tests are performed using the ISO-12103-1 A4
Coarse Dust Test. To understand filter performance
and characteristics, research on dust behaviour in an
"Tests are performed
using ISO-12103-1 A4
Coarse Dust"
performance comparison of air cleaners. The basic
performance characteristics of greatest interest are
air flow restriction or differential pressure, dust
collection efficiency, dust capacity and oil carry-over
on oil bath air cleaners. This test code therefore deals
with the measurement of these parameters.
Brand Manager Bart Ghielen explained the testing
procedures. “The first test is the Air Flow or Resistance
test. The filter test set-up is equipped with a computer
that can programme and control the fan that drives
the air flow cycle and an air flow (pressure difference)
sensor.
“The sensor determines the air pressure before and
after the filter under test. During the test, the air flow
is increased, and the pressure drop over the filter is
continuously measured. This automated test will give
information about the air resistance of a filter plus
other important air property measurements such as
humidity, temperature and absolute air pressure. Twin
Air has developed a computer software programme
that fully automates the test cycle. This software is
able to measure and process the data and make a
first test report.”
Finally, the difference in air resistance of different
After testing, the dust caught by the reference filter
and the filter under test is measured to calculate the
overall filter efficiency and the full life capacity (how
much dust in grams that can be held by the filter
before the resistance is increased by 5 mbar) and its
efficiency (the percentage of dust that is caught by
the filter).
“The mass of the air filter and reference filter are
important measurements for this test. The masses of
the air filter and the reference are measured before
the test. During the test, dust is automatically injected
into an air flow that is controlled at a setpoint value.
After the test, the masses of the air filter and reference
"Fused layers of
open-pore foam"
air filter has been done to give the company a
reference base-line by taking the closest possible look
at the kind of dust that motorcycle air filters are
subjected to by using a scanning electronic
microscope. Images are taken of ISO approved test
dust (yes, there is such a thing), then images are taken
from the dust in the tested air filter and the dust in
the reference ‘absolute filter’ - the ISO approved dust
gauge testing screen.
Bart continued to explain that “during the dust test,
a filter to be tested is placed inside the test set-up.
After the filter under test, the reference filter is tested.
are measured. While the test is underway, the mass
of the dust in the air filter is calculated when the
pressure drop over the filter exceeds 5 mbar relative
to the initial air pressure drop over the air filter.”
ISO-5001 also requires a water seep-through test. The
water tests are performed by spraying water onto the
filter. The per second rate at which the amount of
water sprayed on the filter during the test is
prescribed by the test protocol.
“The goal of the water test is to determine the
amount of water required before the water will seep
through the filter. To be able to measure the moment
of seep-through, a sensor is placed inside the filter
under test. This sensor can be designed or adjusted
to meet the layout of the filter under test. It is
important to follow the layout of a filter as closely as
possible. The completely automated test will
determine the time that was needed before a water
seep-through relative to the amount of water sprayed
on the filter during the test.”
TWIN AIR
Veghel, NETHERLANDS
Tel: +31 (0)413 343040
[email protected]
www.twinair.com