Campbell-scientific CS451/CS456 Pressure Transducer Manuel d'utilisateur télécharger pdf (Page 28)

CS451/CS456 Submersible Pressure Transducer

Periodic evaluation of the desiccant is vital for keeping the vent tube dry. The

CS451/CS456 ships with the desiccant tube attached. To assess the

effectiveness of the desiccant, use one of the following:

• The desiccant in the tube changes color from blue to pink when the

drying power is lost.

• The Enclosure Accessory Humidity Indicator Card (pn 28878).

9.1 Every Visit

• Collect data.

• Visually inspect wiring and physical conditions.

• Check indicating desiccant or enclosure humidity indicator; service if

necessary.

• Check battery condition (inspect physical appearance and use a keyboard

display, PDA, or laptop to view the battery voltage).

• Check all sensor readings; adjust transducer offsets if necessary.

• Check recent data.

9.2 Every Two to Three Years or on a Rotating Schedule

• Send the CS451/CS456 in for inspection.

10. Troubleshooting

The most common causes for erroneous pressure transducer data include:

• poor sensor connections to the datalogger

• damaged cables

• damaged transducers

• moisture in the vent tube

Problem:

Unit will not respond when attempting serial communications.

Suggestion:

Check the power (red is +V and black is ground) and signal (white is SDI-12

data) lines to ensure proper connection to the datalogger. Check the datalogger

program to ensure that the same port the SDI-12 data line is connected to is

specified in the measurement instruction.

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Campbell-scientific CS451/CS456 Pressure Transducer Manuel d'utilisateur Page 28