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