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CS451/CS456 Submersible Pressure Transducer
9
7.1.3 Dislodging Bubbles
While submersing the transducer, air bubbles may become trapped between the
pressure plate and the water surface, causing small offset errors until the
bubbles dissolve. Dislodge these bubbles by gently shaking the CS451/CS456
while under water.
If bubbles are not removed by rotation and shaking
underwater (or bleeding out the air in a closed system), the
CS451/CS456 reading will drift lower by the distance of the
gap as the bubbles are slowly dissolved into the water over
time.
Hitting against the well casing or other solid surface could
damage the transducer.
7.2 Installation Procedure
7.2.1 Lower to Depth
Lower the transducer to an appropriate depth.
Do not drop the instrument or allow it to “free fall” down a
well as this may damage the sensor.
With long drops, it may be necessary to use the weighted nose cone
(option -WN).
7.2.2 Secure the Transducer
7.2.2.1 Tie Wrap/Tape
The transducer body can be strapped with cable ties or tape. Campbell
Scientific offers cable ties that can be used to secure and strain relief the cable.
If installing in a well, fasten the cable to the well head.
Never suspend the CS451/CS456 from the connections at
the top of the cable. Sharp bends or excessive pinching of
the cable can cause damage and may pinch off the vent
tube causing measurement errors.
7.2.2.2 Split Mesh Cable Grip
The Split Mesh Cable Grip can be used to cent
re
the cable and to provide
a method of suspending the cable-reducing cable stretch. It is often
recommended for use in wells. FIGURE
suspended using the split mesh cable grip.
CAUTION
CAUTION
CAUTION
CAUTION