VESDA ECO Detector by Xtralis Product Guide
17898_05 v
Terms and Abbreviations
The following is a list of common terms and conditions relating the product and gas detection in general that
may be used in connection with this document.
ASD Aspirating Smoke Detector
Analogue Output A controlled current output, where the level is set to indicate a measured gas value on a
linear scale
Bump Testing A periodic application of gas to the product to verify its function
BSP British Standard Pipe
CE Product Mark that Indicates compliance to all relevant European directives.
CSA Cross sectional area
EMC Electromagnetic Compatibility. A measure of an electrical products susceptibility to and
emission of EMI.
EMI Electromagnetic Interference
EU European Union
IEC
The International Electro-technical Committee, publishes internationally recognized product
design standards.
LED Light Emitting Diode, an indicating device which emits light of a specific colour when
powered
LEL Lower Explosive Limit, the minimum concentration, expressed as a percentage of volume, of
a flammable gas in air that will generate an explosion if ignited. Also referred to as the LFL.
This value is different for each type of flammable gas, and is defined by the appropriate
local regulations for explosive atmospheres.
%LEL An indication of a gas concentration expressed as a percentage of the LEL
LFL Lower Flammable Limit, see LEL
%LFL An indication of the gas concentration as a percentage of the LFL
LTEL Long Term Exposure Limit, the limit of exposure for a person to a gas over a period typically
between 8 and 24 hours, calculated as a TWA value.
Modbus A serial communications protocol published by the ModbusIDA for use with programmable
logic controllers (PLCs). It is a commonly available means of connecting
industrial electronic devices.
ppm Parts per million, an indication of gas concentration as a fraction of the overall sample.
10000 ppm is the equivalent of 1% of volume.
RFI Radio Frequency Interference
%RH Relative Humidity, the limit of exposure for a person to a gas over a period typically
between 5 and 20 minutes, calculated as a continuous average.
RoHS Restrictions of Hazardous Substances, EU Commission directive 2002/95/EC on the
restrictions of usage of specified chemicals in the production of electronic products and
components
RTC Real Time Clock. An internal clock which maintains a count of the current date and time,
including during periods when the unit is unpowered.
RTU Remote Terminal Unit, a transmission method used by the Modbus Communications
Protocol
STEL Short Term Exposure Limit, the limit of exposure for a person to a gas over a period typically
between 5 and 20 minutes, calculated as a continuous average.
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