Vaisala HMP243 Guide de l'utilisateur Page 65

  • Télécharger
  • Ajouter à mon manuel
  • Imprimer
  • Page
    / 130
  • Table des matières
  • MARQUE LIVRES
  • Noté. / 5. Basé sur avis des utilisateurs
Vue de la page 64
HMP240 series
M210300en User's Guide
63
8.2 Temperature (with additional T sensor head)
Measurement range -40...+180 °C
Typical accuracy at +20 °C (+68 °F) ±0.1 °C
Typical temperature dependence of
electronics 0.005 °C/°C
Temperature sensor Pt 100 RTD DIN IEC 751,
class 1/4 B
8.3 Calculated variables
Without the additional temperature head only dewpoint temperature and
mixing ratio are available.
Typical ranges
relative humidity 0...100 %RH
dewpoint difference 0...+50 °C
mixing ratio 0...500 g/kg dry air
absolute humidity 0...600 g/m
3
wet bulb temperature 0...+100 °C
Response time (90 %) at +20 °C in
still air (with sintered filter) 15 s
Accuracies of the calculated quantities depend on the accuracies of the meas-
ured quantities: relative humidity and temperature. In the dewpoint accuracy
graph and accuracy tables for x, a and Tw the accuracies of relative humidity
and temperature are assumed to be ±(0.5 + 2.5 % of the reading) %RH for
humidity and 0.1°C for temperature (at 25°C). Note that the user can select
whether the HMP240 calculates the frostpoint (default) or the dewpoint when
the dewpoint is < 0 °C. In addition, the HMP240 also calculates the dewpoint
difference, i.e. the difference between the ambient temperature and the
dewpoint ( = dT).
8.3.1 Relative humidity (with additional T sensor head)
Accuracy (including nonlinearity and repeatability)
maximum achievable accuracy when calibrated against high quality,
certified humidity standards: +(0.5 + 2.5 % of the reading) % RH
for example, accuracy at:
0 % RH +0.5 % RH
60 % RH +2.0 % RH
Response time (90 %) at +20 °C in
still air (with sintered filter) 15 s
Vue de la page 64
1 2 ... 60 61 62 63 64 65 66 67 68 69 70 ... 129 130

Commentaires sur ces manuels

Pas de commentaire