FS-9120DN/9520DN
2-1-12
(2) Computing the absolute humidity
The humidity sensor (HUMSENS) converts the relative humidity detected by the humidity sensing element into a voltage
and sends it to the engine controller PWB (EPWB). The engine controller PWB (EPWB) computes the absolute humidity
based on this HUMSENS signal and the temperature (ETTH signal) detected by the external temperature thermistor
(ETTH).
EPWB
HUMSENS
3 HUMSENS
45 V DC
YC16-B10
YC16-B9
YC16-B8
YC16-B7
1
2
ETTH
ETTH
GND
Humidity
sensing element
Figure 2-1-15 Absolute humidity computation block diagram
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