No, but all water filtration systems that are designed to remove sediments and/or parasitic cysts (such as giardia and cryptosporidium) should have a micron rating. Generally speaking, the smaller the micron rating the better. A filter rated at 5 microns is pretty good, a 1- micron "abosolute" rated filter can effectively remove parasitic cysts such as giardia and cryptosporidium, and reverse osmosis systems are rated at approximately 0.

The ISO cleanliness code publishes a recommended cleanliness guideline for typical hydraulic system components; however, always check component manufacturer recommended ratings.

A measure of the pore size in the filter media. Expressed as either ‘Nominal’ or ‘Absolute’. Nominal Rating relates to the percentage of particles at a given size that a filter can capture ie. 10 microns at 90% means it will remove 90% of particles 10 microns in size. Absolute refers to the removal of all particles at a given micron size and larger ie. 20 micron absolute means 100% of particles 20 microns or greater will be captured.

Air filters are not measured by micron size. As an industry standard, air filters are tested in accordance with the ISO 5011 test protocol to measure capacity (the physical amount of dust a filter can hold before cleaning is necessary) and efficiency (the filter’s ability to trap and hold dust). See technical service bulletin 89-5R from the Filter Manufacturer's Council. The dust selected for the test contains a specified distribution of different particle sizes according to ISO standards.

The SE400E and SE800E are equipped with a mesh prefilter to handle the larger particles, and an electrostatic collection cell to focus on the microscopic airborne particulates. The collection cell never needs to be replaced unless it becomes damaged, and the prefilter can be washed and re-used many times before an inexpensive replacement is needed.

The micron rating of a filter represents the size of particle that the filter can remove from the fluid passing through it. The micron rating should be associated with an efficiency or beta value to indicate how efficient the filter is at removing that size of particle. Any given filter will remove various sizes of particles. The difference between filters is how efficient they are at removing certain sizes of particles.

A micron rating is a value assigned to a filter, indicating that filters ability to remove a certain size of particle. To accurately determine the filter's ability in removing a certain particle size, Beta Ratios from multi-pass testing should be used.

Filter life will vary in direct proportion to the amount of water used and the type and level of impurities in the water being processed. It is recommended that the filter be replaced when the first of the following occurs: (a) the unit's rated capacity is reached; (b) annually; (c) the flow rate diminishes (which occurs when the filter becomes clogged with particulate matter); or (d) the filter becomes saturated with bad tastes and odors.

The cleaning frequency will depend on the contamination level, and schedule of use. Generally, for a moderately smoky environment, the filters should be cleaned at least once every 1-2 months. It is always a good idea to set the air cleaner(s) up on a preventative maintenance schedule to ensure that a diligent cleaning procedure is in place.

The Allison 1000 Series™ uses two filters to maintain cleanliness of the Automatic Transmission Fluid (ATF). There is a 'spin-on' filter that is externally accessible and is intended to be changed at each ATF change (see owners manual for recommended change intervals). Current P/N for this filter is 29539579. Because this is a relatively 'high pressure' spin-on filter, it is important to tighten the filter one full turn after the gasket contacts the transmission case.

A micrometer (mi?CROM?e?ter) like this can measure distances to accuracies specified in micrometers (MI?cro?me?ters). Here, the accuracy of 0.002 mm is equal to 2 ?m. A micrometer is, of course, one millionth of a meter or a thousandth of a millimeter. The micron, symbol ?, was originally a special name for this distance, but the name and symbol were officially eliminated in 1968, so it's no longer correct to use microns.

If you intend to fly professionally, we strongly recommend an Instrument rating. Until recently, helicopter Instrument ratings were the exception, not the rule. However, an increasing number of employers (and their insurance companies) now require that their pilots be Instrument-rated. We’re seeing a number of very experienced pilots returning to Quantum for their Instrument training.

Air filters are not rated by micron size on an absolute basis. (See technical service bulletin 89-5R from the Filter Manufacturer's Council) The proper rating system for air filters is a testing procedure developed to measure the efficiency of the filtration media at varying micron sizes. We routinely subject a sample of our air filters to this testing procedure conducted by independent laboratories.

A micron (one-millionth of a meter) is a unit used for microscopic measurements. A human hair is approximately 75-microns.