Campbell Scientific CS451/CS456 Pressure Transducer - Manual (Page 20)

CS451/CS456 Submersible Pressure Transducer
the cable. If installing in a well, fasten the cable to the well head. Wrap the
cable ties around the cable jacket.
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 25431 Split Mesh Cable Grip can be used to center the cable and to
provide a method of suspending the cable-reducing cable stretch. It is often
recommended for use in wells. FIGURE 7-1 shows a transducer’s cable
suspended using the split mesh cable grip.
FIGURE 7-1. Transducer suspended with split mesh cable grip
7.2.3 Measure the Initial Elevation
Use a staff gauge (or other device) to measure the initial elevation of water.
This value is used to calculate an offset that corrects the final measurement for
errors due to zero offset or installation. SCWin will make the offset
calculation. Refer to Section 7.2.4, Offset Calculation, if not using SCWin to
calculate the offset.
After installation, several readings should be taken to ensure proper operations
after installation.
7.2.4 Offset Calculation
The pressure created is directly proportional to the water column above the
sensor. An offset is used to correct the final measurement to any error due to
sensor zero offset or installation.
CAUTION
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