Campbell CS455 Manual descarregar pdf (Página 26)

CS450/CS455 Pressure Transducer

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

CS450/CS455 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.

• An enclosure humidity indicator such as CSI pn 28878 Humidity Indicator

Card.

7.1 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.

7.2 Every Two to Three Years or on a Rotating Schedule

• Send the CS450/CS455 in for inspection and have it serviced and/or

replaced as needed.

8. 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 CS455 Manual Página 26