For models TC120-PH2, TC120-PH2-XC, TC20-PH2 and TC20-PH2-XC, the adjustable
locking feet kit (Nanometrics part number 17245) is optional.
If a sufficiently flat and level installation surface is available, the feet can be removed
and the seismometer will rest on three raised bosses that are located on the bottom of
the seismometer base.
l A leveling bubble on the cover.
For models TC120-PH2, TC120-PH2-XC, TC20-PH2 and TC20-PH2-XC, the bubble level
(Nanometrics part number MSC0225) is optional.
Optional leveling tools for a Trillium Compact are:
l A leveling cradle for rapid leveling on prepared piers or for installation on hard uneven
or unlevel surfaces. (See "Leveling Cradle and Spike Kit" on page96.)
l A spike kit for the leveling cradle that facilitates installations in sediment, soil, gravel, or
sand. (See "Leveling Cradle and Spike Kit" on page96.)
Figure 3-1 shows the north scribe line on a Trillium Compact aligned with a line drawn on the
installation surface that is parallel to north-south.
Chapter 3 - Installing a Trillium Compact Vault Seismometer
16889R10 • 2020-11-12 Page 37
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