Vaisala DM70 - Manual (Page 11)

Chapter 2 __________________________________________________________ Product Overview
CHAPTER 2
PRODUCT OVERVIEW
Introduction to Vaisala DRYCAP
®
Hand-Held
Dewpoint Meter DM70
DM70 measures dewpoint temperature accurately in a measurement
range from -60
°
C up to +60
°
C depending on the probe version.
DM70 incorporates the advanced DRYCAP
®
technology, which
enables reliable and high-performance dewpoint measurement. DM70
measures the following quantities:
- dewpoint/frost point
1)
temperature T
d/f
(
°
C/
°
F)
- dewpoint temperature
2)
T
d
(
°
C/
°
F)
- temperature T (
°
C/
°
F)
- dewpoint/frost point in the atmospheric pressure T
d/f
(
°
C atm/
°
F atm)
- dewpoint in the atmospheric pressure T
d
(
°
C atm/
°
F atm)
- relative humidity RH (%)
- humid air /dry air H
2
O ppm
v
/ppm
w
- absolute humidity a (g/m
3
)
- mixing ratio x (g/kg)
1)
T
d/f
shows the dewpoint temperature above the freezing point (0
°
C/32
°
F) and frost point temperature T
f
(dewpoint over ice) below the
freezing point. This is considered as the industry standard.
2)
T
d
shows the dewpoint over water throughout the entire
measurement range.
VAISALA ________________________________________________________________________ 9