Restriction Indicators
Filter Service Indicators Maximize Filter Life Mounting Options: On air cleaner outlet tube, on intake duct or remote
Choose Restriction Measurement Tools that Best Fit Your Applications Donaldson offers a variety of restriction measuring devices that help you get maximum filter utilization. All measure restriction in inches of water vacuum. All are resistant to vibration, breakage, weather, corrosion, dust and dirt to assure reliable filter restriction readings. Types of Indicators Continuous Reading devises show how much life is left in the filter: • The Informer™ Mechanical Indicators Go/No-Go restriction readings on heavy-duty vehicles: • ServiSignal ™ • Electrical Indicator Electrical Indicator with AMP • Connector
Replacing filters based on restriction readings can reduce your maintenance costs significantly. Visual inspection of air filters is not adequate and should not dictate service life. Filters that appear very dirty may still contain a great amount of service life. Over-servicing and excessive handling of the filter can result in serious consequences: filter damage, improper installation, intake contamination from ambient dust, and/or increased service cost, time and material. In contrast, filter service based on restriction readings can enable you to obtain: the longest life possible from the filter, and the best engine protection. Restriction Readings, Where & When Restriction readings are normally taken at the air cleaner on the clean side of the air filter. If the air cleaner does not have a restriction tap, readings can be taken anywhere in the system between the air cleaner and the engine. To measure restriction of a naturally aspirated diesel engine, the reading is taken at full-governed RPM with no load.
Two methods are used to measure the restriction of turbo- charged engines. The first method is to take the reading with the truck on a dynamometer under full load. This result is actual restriction. A locking step gauge is the second method . This popular method will give actual, on-the- road peak readings. Maximum Restriction Limits for Engines Maximum allowable restriction limits are set by the engine man- ufacturers. If your maximum limit is unknown, contact your engine manufacturer for the maximum limits. Maximum levels are measured at high idle with no load for naturally aspirated and super-charged diesel engines. Turbo-charged diesel, gasoline and carbureted engines are mea- sured at full load with a wide open throttle.
Service Indicator mounted on clean air outlet
Air Cleaner Inlet
Air Cleaner Outlet
Filter service indicators are very effective when mounted on the outlet tube of the air cleaner, as is The Informer ™ above. This gives the operator constant & accurate visibility of filter life.
Engine Air Cleaners, Accessories & Service Parts n 135
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