Vaisala HMD60 Series, Quick Manual

Page: 15 / 154

DIP Switch Humidity Output Selection
Figure 10 HMD65 DIP Switch Example: T
df
Output Selected
RH Relative humidity
Td Dew point temperature
Tdf Dew point/frost point temperature
A Absolute humidity
X Mixing ratio
Tw Wet-bulb temperature
H Enthalpy
You can change the humidity parameter that is output on the RH channel of HMD65 with the
DIP switches on the component board. Select the parameter you want the transmitter to
output by sliding the parameter's DIP switch to the right (
ON ). In the example in Figure 10
(page 15) , the selected output parameter is dew point/frost point temperature (T
df
). Keep the
other DIP switches in the OFF position (left).
The selected parameter uses the default scaling shown in Table 2 (page 15) .
Table 2 HMD65 Default Parameter Scaling
Parameter Default Scaling for 0 … 10 V Output Range
RH 0 … 100 %RH
T
d
-40 ... +80 °C (-40 ... +176 °F)
T
df
-40 ... +80 °C (-40 ... +176 °F)
A
0 … 300 g/m
3
(0 … 131.1 gr/ft
3
)
X 0 … 600 g/kg (0 … 4200 gr/lb)
T
w
-40 ... +80 °C (-40 ... +176 °F)
H -40 … 1600 kJ/kg (-9.5 ... 695.6 Btu/lb)
If you need to change the default scaling of a parameter, configure the output
with Vaisala Insight PC software. See the instructions in
HMD65 User Guide .
If you use the Insight software to further configure the output, note
that the DIP switch selections override the Insight configuration. When using
Insight to configure the output, set all humidity parameter DIP switches to the
OFF position (left) to ensure they do not cause a conflict with the Insight
settings.
CAUTION!
15
ENGLISH