Yokogawa ADMAG AXR - Manual (Page 146)

<11. MAINTENANCE>
11-6
IM 01E30D01-01EN
11.4 Adhesion diagnostic
function
The long-term measurement of adhesive fluids
may adversely affect the flow measurement due
to insulating materials adhering to the electrode,
which could cause the output vibration to increase
or make it impossible to measure the flow rate.
This function checks the level of adhesion by
measuring the resistance value.
NOTE
Adhesion Diagnostic Function
• This function diagnose adhesion using
electrode resistance values.
• The result of adhesion diagnosis is displayed
at K12:Adh Measure Value.
• When “Adhesion check” has been set for
B41/H11: Display Select 2 or B42/H12:
Display Select 3, the diagnose adhesion
is indicated on the display unit using four
different levels.
• If the judgment value for Level 3 is
exceeded, a warning is displayed; and if
the value for Level 4 is exceeded, an alarm
or warning is displayed depending on the
setting condition at G29.
• Available conductivity for this function is
limited to:
Nominal size 25 mm or larger: 10 µS/cm
Make sure to use the adhesion diagnostic
function with the greater conductivity than
the above mentioned value.
IMPORTANT
• Parameters cannot be set during execution
(approximately 5 minutes).
• Adhesion diagnosis should only be carried
out when the fluid velocity is completely zero
by closing the valve.
• Flow measurement is not performed during
execution. While adhesion diagnosis is being
carried out, normally a current of 4 mA is
output. When adhesion diagnosis is carried
out, change the control loop to the manual
mode first.
• Adhesion diagnosis cannot be carried out
while an alarm is occurring.