Campbell CS135, User Manual

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User Guide
9
If the unit has been in storage or transit for more than a few months, the clock
battery may be discharged. However, it will charge from the back-up battery or
mains power.
Close terminal mode with the command “close” (it will close automatically after
10 minutes of inactivity).
If you are not installing the unit straight away you should disconnect the battery to
avoid it being discharged.
4. Installation
4.1 Location and Orientation
The CS135 measures environmental variables and is designed to be located in
harsh weather conditions. However there are a few considerations to take into
account if accurate and representative data from a site are to be obtained.
In order to reduce the service frequency with the unit, the CS135 should be placed
away from sources of contamination. More regular maintenance will be required
when the instrument is placed in areas where contamination is unavoidable or
where measurements may be safety related.
Take care that the orientation allows tilting in whatever direction is desired.
4.2 Grounding
The CS135 must be properly grounded by taking a ground wire with a minimum
cross sectional area of 16 mm
2
and maximum length of 10 m from the brass
grounding boss to an adequate grounding point. Figure 4.3 shows the location of
the grounding boss.
4.3 Mounting the CS135
The CS135 is designed to be bolted to a firm, level foundation. When bolting
down take care that the orientation allows tilting in whatever direction is desired.
Fig 4.1 shows the mounting footprint.
If a suitable surface does not already exist then a concrete foundation should be
constructed at least 600 mm square and 600 mm deep.
Drill four 12 mm diameter holes using the mount base as a template to a depth of
77 mm.
Clean the holes of all debris.
Place washers and nuts on the ends of the wedge anchors supplied (to protect the
threads during installation).
Hammer the wedge anchors into the holes until the start of the threads are below
the surface.
Tighten the nuts until about 25 mm of thread protrudes above the surface.