Guralp Systems CMG-3TB - Manual (Page 5)

Operator's guide
1.1 System configuration
The CMG-3 series of seismic instruments share a number of features:
•
a modular sensor sonde, which can be fitted with a single-jaw or
three-jaw holelock mechanism as required,
•
a pit head installation including a breakout box, and
•
a number of additional, optional control units which may be
connected to the breakout box to perform installation and
maintenance tasks.
For example, a borehole or pit installation of a CMG-3TB or 3ESPB
instrument with single-jaw hole lock has the following layout:
CMG 3-series instruments are also suitable for installing in boreholes
with sand backfill. In this case no hole lock unit is necessary.
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