Monitoring The Conductivity; Monitoring The Electrode Impedance - ABB ProcessMaster FEP630 Manual

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

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 S/cm.
• Nominal diameter DN 10 to 300 (
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 S/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.

Monitoring the electrode impedance

The measurement monitors the impedance between the
measuring electrode and grounding and activates an alarm if the
impedance drops below a limit. The function is activated
together with the conductivity measurement.
Requirements for use:
to 12 in). Additional installation conditions:
• Conductivity of the measuring medium:
20 to 20000 S/cm.
• When using plastic piping, install a grounding plate at the
front and back of the device.
• There must not be any deposits on the measuring
electrodes.
• The measuring tube must always be completely full, and
the measuring medium must have only minor deviations
in conductivity.
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