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Reference Manual
00809-0100-4444, Rev AC
Section 6: Advanced Diagnostics Configuration
January 2015
Advanced Diagnostics Configuration
6.6.2 High process noise parameters
The high process noise diagnostic has two read-only parameters. It does not have any
configurable parameters. This diagnostic requires that flow be present in the pipe and the
velocity be greater than1 ft/s (0.3 m/s).
5 Hz signal to noise ratio (SNR)
This parameter shows the value of the signal to noise ratio at the coil drive frequency of 5 Hz.
This is a read-only value. This number is a measure of the signal strength at 5 Hz relative to the
amount of process noise. If the transmitter is operating in 5 Hz mode, and the signal to noise
ratio remains below 25 for one minute, then the high process noise diagnostic alert will activate.
37 Hz signal to noise ratio (SNR)
This parameter shows the current value of the signal to noise ratio at the coil drive frequency of
37 Hz. This is a read-only value. This number is a measure of the signal strength at 37 Hz relative
to the amount of process noise. If the transmitter is operating in 37 Hz mode, and the signal to
noise ratio remains below 25 for one minute, then the high process noise diagnostic alert will
activate.
6.7 Coated electrode detection
The coated electrode detection diagnostic provides a means of monitoring insulating coating
buildup on the measurement electrodes. If coating is not detected, buildup over time can lead
to a compromised flow measurement. This diagnostic can detect if the electrode is coated and if
the amount of coating is affecting the flow measurement. There are two levels of electrode
coating.
Limit 1 indicates when coating is starting to occur, but has not compromised the flow
measurement.
Limit 2 indicates when coating is affecting the flow measurement and the meter should be
serviced immediately.
LOI menu path
Diagnostics, Variables, 5Hz SNR
Traditional fast keys
1,2,4,4
Device dashboard
2,2,5,5,1
LOI menu path Diagnostics, Variables, 37Hz SNR
Traditional fast keys 1,2,4,5
Device dashboard
2,2,5,5,2