5. Optionally, place the lid on top of the insulating cover and secure it with the latches (see
Figure 3-4 on the previous page
). If you choose not to attach the lid to the top of the
cover, retain the lid for future deployments and transport.
6. Hold the insulating cover above the sensor, aligning the cable slot with the cable (see
Figure 3-4 on the previous page
). Ensure that the insulating cover is centered on the
centerline of the Trillium Compact.
7. Gradually lower the insulating cover over the Trillium Compact, ensuring that the
insulating cover does not touch the seismometer.
Ensuring the cover does not touch the seismometer is important for keeping the
seismometer level and aligned.
If you are using the optional leveling cradle, the inside of the foam will fit snugly with
the legs of the leveling cradle (see
"Using the Leveling Cradle" on page 96
).
8. Place a brick or other heavy object on top of the insulating cover to compress the foam
gasket on the bottom of the insulating cover.
3.9.3 Insulating a Trillium Compact Vault with a Rigid Foam Box
If you are not using the recommended Trillium Compact Vault insulating cover, insulate the
seismometer with a rigid foam box. Use the following recommendations as a guide when
constructing the box:
When installing a Trillium Compact Vault in a rigid foam insulating box, follow the best
practices for aligning and leveling the seismometer that are outlined in
Leveling a Trillium Compact in a Vault Installation" on page 39
.
l
Construct a five-sided box that is large enough to house the seismometer without
touching the sides of the seismometer or the cable.
Preferably, use rigid foam insulation with foil on one or both sides. There are two
advantages to the foil-coated foam:
Chapter 3 - Installing a Trillium Compact Vault Seismometer
16889R10 • 2020-11-12
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