Campbell-scientific CS451/CS456 Pressure Transducer Manual de usuario descargar pdf (Pagina 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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Campbell-scientific CS451/CS456 Pressure Transducer Manual de usuario Pagina 20