Chapter 4 _______________________________________________________________ Installation
VAISALA _______________________________________________________________________ 33
Grounding and Lightning Protection
Equipment Grounding
Equipment grounding protects the electrical modules of PWD22/52
against lightning and prevents radio frequency interference. Equipment
grounding for PWD22/52 is done using the weather station grounding
cable.
Follow the grounding principles:
- Install the grounding rod as close to the pole mast as possible to
minimize the length of the grounding cable. The grounding cable can
also be cast inside the concrete base.
- The length of the grounding rod depends on the local groundwater
level. The lower end of the grounding rod should touch moist soil
continuously.
- Check the quality of the grounding with a georesistance meter. The
resistance must be less than 10 Ω.
Internal Grounding
The electronics enclosure of PWD22/52 is grounded by the power/data
cable jacket. The other parts of the sensor are in galvanic contact with
each other.
Grounding the Remote Units and the
Communication Cable
Ground remote units such as the PC data logger and display, and protect
them against lightning.
WARNING!
A lightning strike through a communication wire can cause
a voltage
surge dangerous to life at remote sites if the remote units are not properly
grounded.
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