The 224-44XR means constant flow air sampling pump with a wide flow range Accurate air volumes without the need for frequent sample pump adjustments, smooth air flow for high flow (750 to 5000 ml/min), pulseless for low flow (5 to 500 ml/min).

Low flow air sampling applications require the optional Adjustable Low Flow Holder (Cat. No. 224-26 series) Back pressure compensation to 40 inches of water The 44XR air sampling pump automatically corrects to maintain a constant flow.

Designed for personal, on-worker applications; quiet enough for indoor air quality investigations Built-in rotameter & particulate trap Provides a visible check of pump flow rate during sampling; the filter assembly with see-through housing and trap protects the pump from debris and reduces maintenance requirements.