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Chapter 2 __________________________________________________________ Product Overview
VAISALA _______________________________________________________________________ 19
CHAPTER 2
PRODUCT OVERVIEW
This chapter introduces the features, advantages, and the product
nomenclature of the Vaisala HUMICAP
®
Humidity and Temperature
Transmitter Series HMT330.
Introduction to HMT330
The HMT330 transmitter provides reliable humidity measurement in a
wide range of applications. Analog outputs can be chosen between
current and voltage signals. Alternatively, digital outputs RS-232
(standard) or RS-422/485 (optional) can be selected.
The quantities measured and calculated by HMT330 are presented in
Table 3 below. The quantities available as an option are presented in
Table 4 below.
Table 3 Quantities Measured by HMT330
Quantity Abbreviati
on
Metric Unit Non Metric
Unit
Relative humidity (RH) RH %RH %RH
Temperature (T) T ºC ºF
Table 4 Optional Quantities Measured by HMT330
Quantity Abbreviati
on
Metric Unit Non Metric
Unit
Dewpoint / Frostpoint
Temperature (T
d/f
)
TDF ºC ºF
Dewpoint Temperature (T
d
) TD ºC ºF
Absolute humidity (a) A g/m
3
gr/ft
3
Mixing ratio (x) X g/kg gr/lb
Wetbulb temperature (T
w
) TW ºC ºF
Humid air volume/ dry air
volume
(by volume or by weight) (H
2
O)
H2O ppmv/ppm
w
ppm
v
/ppm
w
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
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