Duplication prohibited MP101M Environnement S.A
2–11
SEPTEMBER 2013
NOTE : The concept of dew point is an important basis concept about the operation of cooling
dryers of compressed air.
Calculation methods : Magnus-Tetens Formula
Field of validity:
T : measured temperature : 0° C < T < 60 °C*0.15
RH Relative humidity : 0,01 < RH < 1,00 (step, stated in percentage)
T
d
: dew point : 0° C < Td < 50° C
With :
a = 17,27 and b=237,7 [°C]
2.5. REGULATED SAMPLING TUBE (RST)
The regulated sampling tube (RST) line fulfils the requirements of the standards relating to sampling
and measurement of suspended particles PM10 (EN 12341) and PM2.5 (EN 14907). The method of
particles sampling on filter must be equivalent to the reference method. Consequently, sampling must
be carried out at a temperature close to the ambient temperature, in order to avoid any phenomenon
of condensation inside the sampling line and any loss of weight due to the volatile and semi volatile
compounds (as ammonium nitrate) which pass into gaseous phase at about 40 °C.
The regulated sampling tube (RST) line (Figure 2–5) is composed of :
A duct tube of 20 mm diameter (1).
A protection sheath of 60 mm external diameter (2).
A heating cord which surrounds the duct tube (3).
A temperature sensor located on the duct tube (4).
An outside meterological sensor (5) with an atmospheric temperature sensor (5-2) and a probe of
relative humidity (5-1).
An adapter (6) for any standard sampling head (TSP, PM10, PM2.5, PM1, US or EN).
An electrical connector (7) to connect line heating,
A DB15 connector (8) to transfer temperature and moisture signals.
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