Detection Of Gas Bubbles; Monitoring The Conductivity - ABB ProcessMaster FEP630 Series Operating Instruction

FEP630, FEH630 ELECTROMAGNETIC FLOWMETER | OI/FEP630/FEH630-EN REV. D

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 DN 10 to DN 300 (⅜ to 12 in).
• 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.
Menu / parameter Description
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:
•
•
Gas Bubble Threshold Manual fine adjustment of the switching
threshold.
There is no flow
Sensor is completely filled and free of gas
bubbles

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 DN 10 to 300 (⅜ to 12 in).
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 Description
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
Cond. Iout Max Value
value.
Cond.Min Alarm Value Set the alarm for minimum and maximum
conductivity. In the case of down-scale, an alarm
Cond.Max Alarm Value
is triggered.
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.
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