Campbell Scientific PWS100 Present Weather Sensor - Manual (Page 24)

Section 6. Installation
In order to minimize user interaction with the unit, the PWS100 should be
placed away from sources of contamination, in the case of roadside monitoring,
larger mounting poles can be used. More regular maintenance will be required
when the instrument is placed in areas where contamination is unavoidable or
where measurements may be safety critical.
The orientation of the unit should be such that the horizontal sensor head points
north in the northern hemisphere and south in the southern hemisphere. The
angle of inclination of the second sensor head is such that the deviation from
north/south orientation causes no increase in system noise.
High frequency light sources can lead to increased system noise and hence
erroneous weather classification and so the PWS100 should be positioned in a
location where such interference is minimized. Ideally this should be a
minimum of 100 m from the nearest high frequency light source, with the
sensor heads pointing away from the light source. In any case the sensor heads
should be positioned to be away from any high frequency light source.
Avoid locations where the transmitter is pointing at a light scattering or
reflective surface.
When installing the sensor, avoid pointing the laser
housing toward areas where binoculars are commonly
used. WARNING
To be at any risk from the laser light source, the operator must look directly
down the beam of light and must be at the same height and in exact alignment
with the sensor. In addition, the beam diverges slightly so the risk decreases
with distance from the sensor.
6.2 Unloading and Unpacking
6.2.1 Unpacking Procedure
Depending on the power and mounting options selected for the PWS100 there
will be up a number of boxes containing the PWS sensor unit, power supply/
external communications enclosure and grounding equipment.
Handle the boxes carefully, taking care not to drop them as
the sensor can be damaged if dropped. CAUTION
Unpack the boxes carefully and check the contents, ensuring that the contents
match those listed on the packing slip. Carefully remove the items and replace
all packing materials back into the empty boxes and store in case the unit is
required to be repacked for shipping.
6.2.2 Storage Information
The PWS100 should be stored between -40 ° to +70°C in a dry place,
preferably with the enclosures securely fastened with desiccant in place. The
optics should be protected from possible accidental damage.
6-2