In-Situ Level TROLL 400/500/700/700H Operators Manual - Manual (Page 37)

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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 cables,
instruments, and electrical boards dry until your next scheduled maintenance.
Desiccant life span is dependent on site conditions.
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.
R Bend radius 13.5 mm (0.54 in)
D Cable diameter