A dimensional venturi devise used to control gas flow

When applied to a high volume air sampler, this flow control principal incorporates a smooth-wall venturi orifice that gradualy opens to a recovery section. Vacuum is provided by a motor downstream of the venturi. Over 95% of the energy lost in differential pressures across the restricting orifice is recovered in this design.

Product Details

When applied to a high volume air sampler, this flow control principal incorporates a smooth-wall venturi orifice that gradualy opens to a recovery section. Vacuum is provided by a motor downstream of the venturi. Over 95% of the energy lost in differential pressures across the restricting orifice is recovered in this design.

Flow control is accomplished by occluding or restricting and thus accelerating the air flow through the venturi. At some point in the flow stream, the air velocity will equal the acoustic velocity or speed of sound, and critical flow will be achieved. As long as downstream changes are samll, all conditions at the venturi (including the flow rate) are determined by upstream conditions. This condition is referred to as "choking" and is a distinctive characteristic of all VFC's. The GMW PM10/VFC utilizes this principle of choked or critical flow through the venturi is not greatly affected by changes in the filter loading, ambient temperature or barometric pressure, a stable volumetric flow rate is maintained as long as power is provided to the sampler blower motor. GMW PM10 Samplers bear an identification label with the FRM designation number RFPS-1287-063.


Specifications

Motor	HP 1.0 P/N G115923
Amperage	7.0
Wattage	840
Flow Set Point	36 -44 ACFM
Flow Control Accuracy	<1% deviation over 24 hour sampling period
Power Source	110v, 1-Phase, 60 Hz (other electrical options available on request)
Net Weight (System)	136 lbs (62 kg)
Net Weight (G360PM10)	25 lbs (11 kg)