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FEM630 |
ELECTROMAGNETIC FLOWMETER | OI/FEM630-EN REV. A
9 . . .Diagnosis / error messages
. . .Extended diagnostic functions
Detection of gas bubbles
Gas bubbles in the measuring medium influence the flow
measurement values and the measuring accuracy.
It is possible to issue a gas bubble alarm if the actual gas
bubble value exceeds the configured threshold.
This alarm message is shown on the display. The digital
output triggers an alarm if configured accordingly.
Requirements for use:
•
Nominal diameter 3/8” to 12” (DN 10 to DN 300).
•
Conductivity of the measuring medium: 20 to 20000 μS/
cm.
Installation conditions:
• The flowmeter sensor can be installed either horizontally
or vertically. Vertical installation is preferable.
Setup
The gas bubble detection must be matched to the
measuring medium on site.
Monitoring the conductivity
The conductivity of the liquid can be monitored by setting
minimum / maximum alarm thresholds.
As soon as the alarm thresholds are up-scaled, the digital
output triggers an alarm, if configured accordingly.
The conductivity is available as 4 to 20 mA output (option
card).
Requirements for use:
•
Conductivity of the measuring medium: 20 to 20000 μS/
cm.
•
Nominal diameter 3/8” to 4 in (DN 10 to DN 100).
Installation conditions:
• The measuring electrodes must be free of coverings.
Setup
The conductivity monitoring must be matched to the
measuring medium on site.
Menu / parameter
Diagnostics / ...Diagnosis Control / ...Diagnosis Gas Bub.
Gas Bubble On/Off
Activate the function.
Start Adj Gas Bubble
Automatic adjustment of the Gas Bubble
Detection function.
Prior to starting, make sure that:
• There is no flow
• Sensor is completely filled and free of
gas bubbles
Gas Bubble Threshold
Manual fine adjustment of the switching
threshold.
Menu / parameter
Diagnostics / ...Diagnosis Control / ...Diagnosis Conductiv
Conductivity On/Off
Activate the function.
Conductivity [µS/cm]
Indicator of the conductivity in μS/cm.
Adj. Cond. Value
Measure the conductivity of the measuring
medium using a conductivity meter on-site
and enter the measured value here.
Cond. Iout Min Value
Set the 4 mA and 20 mA value which
correspond to the upper and lower range of
the conductivity value.
Cond. Iout Max Value
Cond.Min Alarm Value
Set the alarm for minimum and maximum
conductivity. In the case of down-scale, an
alarm is triggered.
Cond.Max Alarm Value
Elec. Imp. E1-GND
Impedance between electrode E1 and GND
(ground potential).
Input/Output / ...Curr.Out V1/V2
Output Value
Select ‘Conductivity’ to output the
conductivity over the current output V1 / V2
Only with appropriate plug-in card.
