In-Situ Aqua TROLL 100 and 200 Operators Manual - Manual (Page 69)

Page 69 Aqua TROLL Operator’s Manual
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 bend radius
is 13.5 mm (0.54 in), which 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 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 when using vented cable.
Stabilization Time
Allow the Aqua TROLL Instrument 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 and stretching can cause apparent changes in the
level reading. A completely dry conductivity sensor may need a
few minutes settling time after initial immersion. If you expect
to monitor conductivity and water levels at the highest accuracy
possible for the instrument, allow stabilization time.
Shallow Deployment
When deploying the Aqua TROLL Instrument in shallow water,
bubble formation on the conductivity sensor can create
false readings. We recommend the following to minimize the
formation of bubbles:
Section 7: Field Installation
TIP: Be sure to
replace the desiccant
before it appears
pink. Expired desiccant can
allow moisture build up in the
vent tube, causing a blockage
resulting in inaccurate data.
Do not sub merge
the cable
connector; do not
immerse in any fluid.
The minimum
bend radius for
vented cable is
13.5 mm (0.54 in).
Do not deploy
pressure
transducers such
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.