Trillium 240 Seismometer Insulating Cover Installation Guide
16130R1
•
2006-11-29
About the Trillium 240 Seismometer Insulating Cover
The Trillium 240 Seismometer Insulating Cover (Insulating Cover) is an easily installed system
that provides thermal insulation and protection from external air currents for the Trillium 240 Seis-
mometer. The Insulating Cover includes a foam base gasket and a rigid form-fitting cover with
form features matched to the Trillium 240. Properly installed, it will attenuate temperature-induced
long-period noise by up to 40dB. A sensor cable with a right-angle connector is required when
using the Insulating Cover.
Standard versus modified installations
The gasket has pre-cut plugs that can be used either in
a standard arrangement, or in modified installation
arrangements if necessary.
A standard installation retains the original position of
the cable outlet. This ensures the maximum length of
sensor cable, about 1m, is enclosed in the Insulating
Cover. This helps attenuate temperature variations
conducted by the cable.
If your installation requires a different exit point for the
sensor cable, you can separate the centre plug from the
outer main gasket. You can then rotate the outer gasket
to move the cable outlet as required. A modified instal-
lation provides less insulation for the sensor cable.
Installing the Insulating Cover
1. Remove the pre-cut gasket plugs as required for your installation (see the examples above).
Keep the alignment plugs for standard installations as in example (A).
Keep the centre plug and the alignment plugs for modified installations like example (C).
2. Place the gasket on the pier with the gasket alignment holes roughly centred over the East-
West sensor alignment line.
3. Place the Trillium 240 in the gasket on the pier and then align the sensor (see the Trillium 240
User Guide for sensor alignment recommendations).
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Содержание Trillium 240
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