Campbell Scientific PWS100 Present Weather Sensor - Manual (Page 25)

Section 6. Installation
6.3 Installation Procedures
6.3.1 Assembling the PWS100
The PWS100 comes as a single unit, with the DSP enclosure attached to the
base of the sensor arms. The PWS100 and power/communication enclosure (if
purchased) are typically mounted to a Campbell Scientific tripod. User-
supplied mounting structures should be strong enough to withstand high winds,
without significant movement.
See the manuals supplied with your tripod for details on how to set up ready
for PWS100 mounting. Tripods need to be firmly secured to a base with the
central pole vertical to ensure correct measurements with the PWS100. See the
relevant tripod or tower manual for further details.
6.3.2 Mounting the PWS100
A PWS100 purchased from Campbell Scientific Europe will
have a different mounting bracket. NOTE
A pole mounting kit is supplied with the PWS100. This kit includes a DSP
plate, a bracket, two u-bolts, four flat washers, four split washers, and four
nuts. The PWS100 usually comes with the DSP plate attached to it. The
PWS100 mounts onto a Campbell Scientfiic tripod, tower, or a user-supplied
pole with a 1.5 inch (3.81 cm) to 2.1 inch (5.25 cm) outer diameter as follows.
1. Fasten the bracket to the pole using one u-bolt, two flat washers, two split
washers, and two nuts (see Figure 6-2).
2. Place the DSP plate on the bracket. The tabs of the bracket fit in the
notches at the top of the DSP plate (see Figure 6-3).
3. Fasten the bottom of the DSP plate using the remaining u-bolt, washers,
and nuts (see Figure 6-4).
4. Mount the power supply enclosure if purchased. This enclosure can be
mounted to the same tripod, tower, or user-supplied pole as the PWS100.
Alternatively the power supply can be mounted elsewhere (e.g., on a wall
at some distance from the sensor). The power supply enclosure should be
mounted away from the sensor head to avoid wind flow disturbance or rain
drops bouncing back up into the sensor’s sensing volume.
Take care not to overtighten the nuts on the u-bolts, as it
may be possible to distort and/or damage the bracket or
DSP plate by doing so, and/or the nuts may seize up. Only
tighten the nuts to a degree necessary to hold the PWS100
firmly in place. CAUTION
6-3