54
Level
trOll
Operator’s Manual
0052210 rev. 006
be located where you think it is — for example, it could be wedged
against the casing with a loop of cable hanging below it. A probe in
such a position might become dislodged and move while logging,
giving a false change in level.
A secure placement is critical to
accurate measurements.
4
Do not allow the vented cable to kink or bend. If the internal vent tube
is obstructed, water level measurements can be adversely affected.
The recommended minimum
is twice the cable diameter.
4
For accurate measurements, the instrument should remain immobile
while logging data.
4
Be sure the “uphole” cable end is capped—desiccant cap on the vented
cable connector, soft dust cap on non-vented cable—and positioned above
the highest anticipated water level. Avoid areas that may flood.
4
Do not deploy pressure transducers in such a way that ice may
form on or near the sensor or cable connections. Ice formation is
a powerful expansive force and may over-pressurize the sensor or
otherwise cause damage. Any damage associated with ice formation
is not covered by the warranty.
StabILIzatIon tIme
Allow the Level TROLL to stabilize to the water conditions for
about
an hour
before logging data. A generous stabilization time is always
desirable, especially in long-term deployments. Even though the cable is
shielded, temperature stabiliza tion, stretching, and unkinking can cause
apparent changes in the probe reading. If you expect to monitor water
levels to the accuracy of the probe, it’s worth allowing the extra time for
the probe to stabilize to its environment.
seCtion 6: FieLd instaLLation
The minimum
bend radius for
vented cable is
13.5 mm (0.54 in).
Do not
submerge the
connector at the
uphole end of the cable.
TIP:
Be sure
to replace the
desiccant when
it appears pink. Expired
desiccant can allow
water build up in the vent
tube, causing a blockage
resulting in inaccurate data.
