2.5.5 DIP Switch Humidity Output Selection
Figure 7 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 7
(page 11), 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 4 (page 11).
Table 4 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)
Note that the humidity output parameter selected with the DIP
switches on the transmitter component board will be used instead of the
parameter selected with Insight. When using Insight to configure the output, set
all humidity parameter selection DIP switches on the transmitter component
board to the OFF position (left) to ensure they do not cause a conflict with the
Insight settings.
CAUTION!
Chapter 2 – Product Overview
11
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