Vaisala DMT340 - Manual (Page 20)

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)