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17. GLOSSARY AND DEFINITIONS
Flow rate The volume of air mixture which passes per unit time.
IP Ingress protection.
µg/m³ Microgram per cubic metre. The concentration of an air pollutant
given in micrograms (one-millionth of a gram) per cubic meter of
air.
mg/m³ Milligram per cubic metre. The concentration of an air pollutant
given in milligrams (one-thousandth of a gram) per cubic metre of
air.
OPC Optical particulate counter.
PPM Parts per million.
Particulate matter (PM) General term for a mixture of solids and liquid droplets suspended
in the air from typical processes including combustion, industrial
activities or natural sources.
TSP Total suspended particulate.
XD One_User manual_P5644.1601_Rev B
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