The Model DF28BMHTE heavy duty hand truck mounted mobile low volume air sampler designed for outdoor use with digital flowmeter and an adjustable, stainless steel sampling gooseneck. The adjustable gooseneck permits sampling at heights varying from 4’ to 7’ (122 – 213 cm) above floor level. Model DF28BMHTE contains state of the art microprocessor electronics, which provides for corrected flow rate measurements, volume totalizations, and an RS232 communications port. It has a large bright LED display. The air sampler is contained in a powder coat painted environmental enclosure mounted ~3.5 inches above ground level.
The DF28BMHTE Air Sampler includes an oil-less, carbon vane vacuum pump with a constant airflow regulator for use where a nearly constant airflow is desirable. The regulator holds a constant pressure drop across an in-line orifice by varying the flow through a bypass valve into the pump. This system allows the pump to work at a minimum pressure drop at all times, permitting it to run cooler, thus extending its lifetime. The oil-less pump requires no lubrication to maintain optimal efficiency during its service life. The pump is mounted on a rugged mobile hand truck with two 11” diameter pneumatic tires to facilitate mobile transportation of the unit.
