TSI Instruments EVM SERIES, Руководство пользователя

Страница: 12 / 178

Introduction
Particulate Sampling (Aerosols/Dust Vapors)
EVM Series User Manual
2
Particulate Sampling (Aerosols/Dust Vapors)
The EVM is a portable-area monitoring instrument with a laser-photometer that measures and stores
concentration levels of airborne-dust over time. It is designed to measure and help you identify the air
pollutants, existing as matter (gases and aerosols) in the environment. The methodology used entails a
handful of components including: an air inlet, the impactor (which is the particle size selector), the
collection of particulates, gravimetric sampling, and the pump which are addressed in the upcoming
sections.
Particulate Path
Figure 1-1: Particulate path diagram
(1) TURRET
Air travels though the impactor and the
larger, heavier particulates will stick to
the greased plates within the impactor.
(2) OPTICAL ENGINE
While the pump maintains the flow rate,
the smaller lighter particulates will pass
through the optical engine.
(4) PUMP
The remaining clean/filtered air passes
through the pump.
(3) GRAVIMETRIC CASSETTE
The particulates will collect/trap in the
gravimetric filter/cassettes.
(5) FLOW SENSOR
The clean/filtered air passes through
flow sensor (flow-control orifice hole).
(6) OUTLET
Lastly, it passes through to the Outlet on
the back of the instrument.
❶
❷
❸
❹
❺
❻