Testo 350 Field Guide - Actoolsupply.com
Testo 350 Field Guide - Actoolsupply.com
Testo 350 Field Guide - Actoolsupply.com
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Expression<br />
Spelling<br />
Parts per billion 0,001 ppm 0,0000001%<br />
Parts per million 1 ppm 0,0001%<br />
10 ppm 0,001%<br />
100 ppm 0,01%<br />
1000 ppm 0,1%<br />
10000 ppm 1%<br />
Table 16: Particle concentration in ppm and % with subdivisions<br />
Please note<br />
Because of the variation of a gas volume with temperature and pressure changes<br />
it is necessary to use one of the following alternatives for describing a concentration<br />
value:<br />
• additional specification of gas temperature and pressure values<br />
existing during measurement<br />
or<br />
• conversion of the measured concentration value into the corresponding value<br />
at standard zero conditions, see the following chapter.<br />
After conversion, the volume is expressed as standard volume<br />
(standard cubic meter, Nm 3 or m 3 N).<br />
Standard zero conditions of a gas<br />
The volume of a gas depends on its actual temperature and pressure.<br />
To achieve <strong>com</strong>parable results a standard zero volume has been defined:<br />
A gas has its standard zero volume at a pressure of 1013 mbar (hPa)<br />
and a temperature of 273 K (corresponding to 0 °C).<br />
48<br />
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