Guralp Systems CMG-1T User Manual
Page 32
CMG-1T Ocean Bottom Seismometer Operator’s
Guide
Section 9, Page 2 September 1999,
Issue C
It is recommended that ceramic spacers with nylon shoulder washers are used to
achieve a very high degree of insulation resistance, >>100M
Ω
.
IMPORTANT Care must be taken not to rest the levelling system on it’s base
without spacers as wiring which exists at the bottom of the
levelling system might be damaged.
The installation of the levelling system together with the sensor requires care
and precision. If the installation method within a casing is not completely
straight forward Güralp Systems Limited will be prepared to comment on your
particular design.
The levelling system can also be installed in a 17” glass sphere. A drawing of
the overall glass bowl and levelling system is given in the following diagram.