Xtralis VESDA ECO, Product Manual, Page: 8 / 96

Product Guide VESDA ECO Detector by Xtralis
vi 17898_05
T
XX
Time The response time of the gas sensor to a step change in the input gas level to “XX”% of the
final reading, e.g. T
90
is the time taken for the measurement to reach 90% of a step change
in the gas input level.
TWA Time Weighted Average.
UL Underwriters Laboratory, approval and certification of products in North America
USB Universal Serial Bus, a serial interface standard for connecting PCs to peripheral devices
% v/v An expression of the gas concentration as a percentage of the overall volume, also referred
to as % Vol. or % Volume.
WEEE Waste Electronic and Electrical Equipment, EU Commission directive 2002/96/EC on the
disposal of electrical and electronic equipment