COSA Xentaur Hygrocontrol Type 72 - Manual (Page 25)

Series 72 Manual page 21
PSF = Saturated Vapor Pressure over Chilled Water
PSE = Saturated Vapor Pressure over Ice
M
= Rel. Humidity displayed by HYGROMESS Instruments.
11.7 Measurements under Pressure or Vaccuum
All probes can be used at pressures of 0,9 to 1,3 bar. Only special probes
with a glas feed-through (which predicts SS - 316 tube material) may be
used under pressures of 0,03 to 30 bar. As rel. Humidity is directly
proportional to the pressure (f.E.: increase of pressure by factor 2 also
increases rel. Humidity by factor 2, when temperature and content of water
remain constant!) you shoud take care of a place with constant pressure
values, when mounting the probe. Be aware that pressure may change,
when diameters of tubes change - and air streams may be turbulent at
these places.
Table 4: Gas Concentrations with Humidity Error < 2.5 %RH
MAXIMUM CONCENTRATION AT MAK-
CONCENTRATIO
N
ACCORDING TO
continuous load 50 % load
EXPL.-
LIMIT CHEMICAL
ppm g/m 3 ppm g/m 3 ppm g/m 3 g/m 3
Ethanol (Alkohol) 1000 1,9 3500 6 7000 12 57
Isopropanol 400 0,98 4800 12 10000 25 67
Toluol + Xylol 100 0,38 1300 5 3000 12 53
Gasoline (pure) 300 1,1-1,4 150 200 51
Gasoline super (Automobil) 100 150 32
Ethylenglycol 100 0,26 1200 3 1200 3 80
Acetone 1000 2,4 3300 8 6500 16 56
Ethylacetat 400 1,4 4000 15 8000 30 79
Acetic Acid 10 0,03 800 2 1200 3 107
Ammoniumhydroxid 25 0,02 5500 4 11000 8 -
Chlorine Acid (HCl) 5 0,01 300 0,5 500 0,75 -
Sulfurhydrogen (H
2
S) 10 0,01 350 0,5 700 1 -
Sulfurdioxid (SO
2
) 5 0,01 5 0,01 5 0,01 -
1) MAK = max. Concentration at Labor (at 1 bar and 20 °C)
2) ppm = g/m 3 x 24,04/MOL MOL = Molweight of Material