User manual

CS475, CS476, and CS477 Radar Water Level Sensor
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8.2 Diagnostics and Repair
The radar sensor is extremely reliable, but problems can occur during operation.
Most of these problems are caused by the following:
• Sensor
• Environmental conditions
• Power supply
• Signal processing
When you encounter a problem with the radar sensor, check the error messages
from the aM!, followed by the aD0! command to help evaluate the issue.
1. During the initial power up or resumption of supply voltage to the
sensor, some SDI-12 commands, such as the I command, will not
yield the expected responses.
2. A typical response to the aD0! command results in a response of
108003 where approximately 80 seconds is the required time to
complete the BIST (Built In Self Test) of the instrument. After power
up is complete, normal SDI-12 communication starts.
8.2.1 No Measured Value Available — Error E013
If you are unable to find a measured value, check the following:
• Sensor in boot phase
• Update the Start False Echo Learn (aXSFEL).
8.2.2 No Measured Value Available — Error E041, E042, E043
If you have a hardware error or have defective electronics, try cycling the power to
the sensor. If the sensor recovers, no further steps are required. If the sensor does
not recover, do one of the following:
• Exchange the electronics module (see Section 8.2.2.1, Exchange Electronics
Module)
• Return the equipment for repair (an RMA number is required)
8.2.2.1 Exchange Electronics Module
If you do not have an electronics module onsite, order one from Campbell
Scientific.
NOTES