Glossary of Terms
EVM Series User Manual
The following measurements are displayed on the instrument and in the Logged data
table/chart in DMS.
The measurement value over the time interval (or logging
interval)
The instantaneous measurement at a specific point in time.
The minimum measurement over the time interval (or logging
interval).
The maximum measurement over the time interval (or logging
interval).
STEL (Short term
Exposure Limit)
The maximum concentration above the time-weighted average
that employees can be exposed to over a specific time period
(usually 15 minutes) no more than four (4) times per day. (See
PEL for more information.)
Most permissible exposure limits are based upon an 8-hour
time weighted average (TWA). The air concentration may
sometimes go above the TWA value, as long as the 8-hour
average stays below. (See PEL for more information.)
The Mine Safety and Health Administration in the USA.
The National Institute for Occupational Safety and Hygiene in the United States. An
organization dedicated to investigating the harmful effects of varied industrial hazards
on the working population and promulgating regulations to control their harmful
effects.
The Occupational Safety and Health Administration in the United States. A division of
the Department of Labor charged with dealing with the health and welfare of the
working population that issues guidelines and legislation to control the hazards at
work.
Particulate matter, [also referred to as total suspended particles (TSP)] consists of
tiny inhalable dust which can be man-made or natural. A wide range of particulates
include the following pollutants: road dust, the burning of fossil fuel, diesel soot,
environmental fires (forest or grassland), power plants, and wood smoke. These
particles are a mixture of visible and microscopic solid particles and tiny liquid
droplets referred to as aerosols.
PM10 is the fraction of PM containing particles that are small
enough to pass the PM10 impactor (10 mm)
The cut-points for respirable dust are: PM4 (4 microns), PM2.5
(2.5 microns)
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