8.0
DEFENITION OF TERMS
Terms
Description
vol%
The rate of substance occupying in some volume.
The unit is indicated by percentage.
ppm
The rate of substance occupying in some volume.
The unit is indicated by ppm “parts per million”.
%LEL
This is the unit when defining the Lower Explosive Limit of a combustible gas as
100%.
mg/l
This is the unit of the target gas mass that is contained in one litter.
The standard is under the condition of 20
℃
, 101.3kPa.
MJ/m3
Gross
This is the unit of calorie, and it is indicated by gross calorific value 0
℃
.
Gross calorific value 0
℃
is common calorie unit among city gas companies. It
is equal to the calorie in case of complete combustion of a gas 1m3 under the
standard condition (0
℃
, 1pressure).
Gas combustion generates steam.
Gross calorific value includes the calorie of the steam (latent heat).
MJ/m3
Net
This is the unit of calorie, and it is indicated by net calorific value 0
℃
.
Net calorific value 0
℃
is equal to the calorie in case of complete combustion of
a gas 1m3 under the standard condition (0
℃
, 1pressure).
Gas combustion generates steam. Net calorific value excludes the calorie of
the steam (latent heat).
Gross calorific value = Net calorific value + Latent heat
Measuring Gas
The target gas to measure in the sample gas.
Base Gas
The balance gas in the sample gas.
Reference Gas
The gas (fresh air) to take the standard reflection ratio.
Gas Chamber
Chamber that is filled by sample gas.
Reference Gas Chamber
Chamber that is filled by reference gas.
AIR CAL VALUE
Concentration indicated on the display when AIR CAL key is pressed.
