TEOM Series 1400a Monitor
Tapered Element Technology

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The Series 1400a monitor incorporates an inertial balance patented by Rupprecht & Patashnick. It measures the mass collected on an exchangeable filter cartridge by monitoring the corresponding frequency changes of a tapered element (photo at right). The sample flow passes through the filter, where particulate matter collects, and then continues through the hollow tapered element on its way to an electronic flow control system and vacuum pump.
As more mass collects on the exchangeable filter, the tube's natural frequency of oscillation decreases. A direct relationship exists between the tube's change in frequency and mass on the filter. This inertial methodology is a more fundamental means of measuring mass than the use of gravity. The tapered element technology enables highly precise and accurate mass determinations, providing more resolution than conventional microbalances.
The TEOM mass transducer does not require recalibration because it is specially designed and constructed from non-fatiguing materials. Calibration may be verified, however, using an optional Mass Calibration Verification Kit that contains a filter of known mass.

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