Campbell CS451, Instruction Manual

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CS451/CS456 Submersible Pressure Transducer
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The desiccant in the tube changes color from blue to pink when the drying
power is lost.
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The Enclosure Accessory Humidity Indicator Card (pn 28878).
8.1 Every Visit
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Collect data
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Visually inspect wiring and physical conditions
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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
8.2 Every Two to Three Years or on a Rotating Schedule
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Send the CS451/CS456 in for inspection.
9. Troubleshooting
The most common causes for erroneous pressure transducer data include:
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poor sensor connections to the datalogger
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damaged cables
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damaged transducers
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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.
Problem:
Transducer appears to be operating properly but data shows a periodic or cyclic
fluctuation not attributable to water level changes.
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