4 installing in vaults – Guralp Systems CMG-6TD User Manual
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Installing the 6TD
4.4
Installing in vaults
You can install a 6TD in an existing seismic vault with the following
procedure:
1. Unpack the sensors from their container, saving the shipping boxes for
later transportation.
2. Prepare the mounting surface, which should be smooth and free of
cracks. Remove any loose particles or dust, and any pieces of loose
surfacing. This ensures good contact between the instrument's feet and
the surface.
3. If it is not already present, inscribe an accurate North-South line on the
mounting surface.
4. Place the sensor over the scribed line, so that the brass and steel
pointers are aligned with the marked directions, with the brass pointer
facing North. This can be done by rotating the base of the sensor whilst
observing it from above. The brass pointer can be found next to one of
the feet.
If you cannot easily see the pointers, you should align the sensor using
the north arrow on the handle. However, the alignment of the handle
with the sensors inside is less accurate than the metal pointers, so they
should be used wherever possible.
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Issue F - February 2014