4-20 Ma Loop Verification - Emerson Rosemount 8782 Reference Manual

Advanced Diagnostics Configuration
November 2019
Electrode coating (EC) level 1 limit
LOI menu path
Set the criteria for the electrode coating limit 1 which indicates when coating is starting to
occur, but has not compromised the flow measurement. The default value for this
parameter is 1000 k Ohm.
Electrode coating (EC) level 2 limit
LOI menu path
Set the criteria for the electrode coating limit 2 which indicates when coating is affecting
the flow measurement and the meter should be serviced immediately. The default value
for this parameter is 2000 k Ohm.
Maximum electrode coating (EC)
LOI menu path
The maximum electrode coating value reads the maximum value of the coated electrode
detection diagnostic since the last maximum value reset.
Clear maximum electrode value
LOI menu path
Use this method to reset the maximum electrode coating value.
9.9

4-20 mA loop verification

The 4-20 mA loop verification diagnostic provides a means of verifying the analog output
loop is functioning properly. This is a manually initiated diagnostic test. This diagnostic
checks the integrity of the analog loop and provides a health status of the circuit. If the
verification does not pass, this will be highlighted in the results given at the end of the
check.
The 4-20 mA loop verification diagnostic is useful for testing the analog output when
errors are suspected. The diagnostic tests the analog loop at five different mA output
levels:
• 4 mA
• 12 mA
• 20 mA
• Low alarm level
• High alarm level
96
Diagnostics → Advanced Diag → Elec Coat → EC Limit 1
Diagnostics → Advanced Diag → Elec Coat → EC Limit 2
Diagnostics → Advanced Diag → Elec Coat → EC Max Value
Diagnostics → Advanced Diag → Elec Coat → Reset Max Val
®
Rosemount 8782 Slurry Magnetic Flow Meter Transmitter with HART Protocol
Reference Manual
00809-0100-8782