Vaisala DRYCAP DMT340 SERIES Guide de l'utilisateur Page 20

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User's Guide _______________________________________________________________________
18 ___________________________________________________________________ M210704EN-G
Table 2 Quantities and Their Abbreviations
Quantity
Abbreviation
Metric Unit
Non-Metric
Unit
Dewpoint/frost point
temperature (T
d/f
)
TDF
ºC
ºF
Mixing ratio (x)
X
g/kg
gr/lb
Parts per million
H2O
ppm
v
/ ppm
w
ppm
v
/ ppm
w
Table 3 Optional Quantities and Their Abbreviations
Quantity
Abbreviation
Metric Unit
Non-Metric
Unit
Relative humidity RH
RH
%RH
%RH
Temperature T
T
ºC
ºF
Dewpoint/frost point in the
atmospheric pressure (T
d/f
)
TDFA
ºC atm
ºF atm
Absolute humidity (a)
A
g/m
3
gr/ft
3
Absolute humidity in standard
pressure and temperature (NTP)
ANTP
g/m
3
gr/ft
3
Wet bulb temperature (T
w
)
TW
ºC
ºF
Water vapor pressure (P
w
)
PW
hPa
lb/in
2
Water vapor saturation pressure
(P
ws
)
PWS
hPa
lb/in
2
Enthalpy (h)
H
kJ/kg
Btu/lb
Difference of T and T
d/f
(∆T)
DT
ºC
ºF
Dewpoint temperature (T
d
)*
TD
ºC
ºF
Dewpoint in the atmospheric
pressure (T
d
)*
TDA
ºC atm
ºF atm
* Use these parameters only if you need dewpoint over water below 0 ºC/32ºF and not
over ice (industry standard)
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