In-situ Level TROLL 400, Operator'S Manual, Page: 39 / 85

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Install the Desiccant
Vented cable must be protected with a desiccant pack that is properly sized for site
conditions.
Desiccant
Desiccant protects cables, connections, and internal components from condensation, which can cause irreparable damage
and loss of data. Indicating desiccant changes from blue to pink as it becomes saturated with moisture.
Desiccant stages (from left)
New, nearly expired (replace now), expired
It is extremely important to use a properly-sized desiccant for your deployment and to change desiccant often . Desiccant
should be changed before the entire volume has turned pink, and you should use enough desiccant to effectively keep your
equipment dry until your next scheduled maintenance. Desiccant longevity is dependent on site conditions and can vary from
one site to the next.
Installation Guidelines
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Never let the instrument fall freely down a well. Doing so will damage the sensor.
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After you have installed the instrument, verify the water level reading. Move the instrument and take another
reading to ensure that the instrument shows reasonable change. The instrument could be wedged against the well
casing with a loop of cable hanging below. An instrument in such a position could become dislodged and move
while it is logging data, which would record a false change in the water level.
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For accurate measurements, the instrument should remain immobile while it is logging data.
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Make sure that the uphole cable end is protected. The vented cable must be protected with a desiccant, and the
non-vented cable must be protected with a dust cap. The uphole cable end must be positioned above the highest
anticipated water level. Avoid placing this end in a location that might flood.
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Do not deploy instruments in such a way that ice may form on or near the sensor or cable connections. Ice
formation is a powerful expansive force that can over-pressurize the sensor or otherwise cause damage. Damage
associated with ice formation is not covered by the instrument warranty.
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Do not allow vented cable to bend enough to obstruct the internal vent tube. The recommended bend radius is 13.5
mm (0.54 in), which is twice the cable diameter.