Campbell Scientific CS445 Liquid Level Sensor - Manual (Page 11)

CS445 Liquid Level Sensor
7
7. Troubleshooting Hints
Problem:
Unit will not respond when attempting serial communications.
Suggestion:
Check the power (Red is +V and Black is Ground ) and signal (Brown is SDI-
12 Data) lines to ensure proper connection to the logger. Check the logger
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.
Suggestion:
A kinked or plugged vent tube will not effectively vent a gauge pressure
(Vented) type of device. Normal changes in barometric pressure will appear as
water level fluctuations and these types of errors are typically on the order of 1
foot of water level. If the desiccant chamber has not been properly maintained,
water may have condensed in the vent tube and the device should be returned
to the factory for service.
Note that errors in uncompensated depth measurement using absolute (Non-
Vented) devices are expected and may or may not be significant, depending on
the application. A barometric pressure transducer can be used to provide
compensation data, effectively eliminating error due to barometric fluctuations.