Campbell Scientific PWS100 Present Weather Sensor - Manual (Page 89)

Section 8. Functional Description
FIGURE 8-3. Sensor unit
Plano-convex lens Photodiode
Filter
FIGURE 8-4. Sensor unit showing light path extents (not to scale)
8.3 Additional Sensor Connections
Although it is possible to use the PWS100 as a stand alone present weather
sensor, its ability to distinguish particle types is improved when certain other
sensors are connected to the unit. In particular a temperature and RH probe
provides the system with more discriminating parameters, ensuring that solid
and liquid precipitation are more clearly identified. Though general statistics
would be enough on most occasions to determine particle types over minute or
hour long averaging periods, individual particle analysis will benefit from these
extra temperature, humidity and corresponding wet bulb temperature
parameters being incorporated into the classification algorithms. The CS215-
PWS temperature and relative humidity probe is available as an accessory.
The CS215-PWS’s cable is fitted with a LEMO connector that attaches to the
PWS100.
8-3