The winch should only be operated by persons who are suitably trained to do so and
who are familiar with any local regulations for this type of a device. The stall force of
the winch must be less than the rated load of the tripod and lifting wire rope to prevent
breakage if the equipment becomes jammed or snagged during lifting. Failure to follow
safety instructions may result in severe personal injury, death or damage to property.
1. Lay out, in a straight line if possible, the sensor cable and the lifting cable (also known as
a wire rope).
2. Attach the load-bearing wire rope to the eyebolt located on the top of the Trillium
Compact Posthole seismometer.
3. Attach the magnetic cable strain relief to both the
seismometer cable and the wire rope 0.6 meter
above the top of the Trillium Compact Posthole
seismometer (see image). Ensure that you allow a
little slack in the seismometer cable when you
attach the magnetic cable strain relief so that the
weight of the seismometer is supported by the
load-bearing wire rope.
4. Insert the thicker seismometer cable into the wider
cutout in the magnetic cable lock and insert the
thinner load-bearing wire rope into the narrower
cutout. Use a screwdriver to securely tighten the
screws (1 N•m or 9 inch-pounds).
The magnetic cable strain relief is used to prevent any vibrations that travel down the
wire rope and the seismometer cable from being transferred to the seismometer.
When the tension is removed from the wire rope and seismometer cable, the magnetic
cable strain relief uses magnetic force to attach itself to the side of the cased hole. This
ensures that the 0.6 m of seismometer cable and wire rope between it and the top of
the seismometer are not under any strain and are isolated from vibration or motion of
the cable and wire rope that occurs above the magnetic cable strain relief.
5. Use the tripod and winch to lift the seismometer off of the ground and position it over
the hole.
Chapter 2 - Installing a Trillium Compact Posthole Seismometer
16889R10 • 2020-11-12
Page 26
