ABB FSM4000-SE41F - Page 90

Parameterization
90 FSM4000 D184B140U02
7.4.1.5 Determining the electrode AC voltage for E1 and E2
E1
E2
G00578c
Primary signal for determining the electrode balance.
The electrode AC voltages are measured at the electrodes E1
and E2 to ground. The voltage measured is proportional to the
flowrate.
The electrode AC voltage can be measured without affecting
the flow measurement in any way.
To perform this measurement, it is necessary to switch on one
of the relevant errors or warnings in the submenu
"Diagnostics / Alarm Settings" (see page 82).
Important
The electrode zero point must be adjusted under the submenu "Diagnostics / Adjustment /
Electr. Zero Point"
(
see pa
g
e 85
)
.
7.4.1.6 Determining the electrode balance
E1 ≥ E2 → EB =
2E
1E
%
E1 < E2 → EB = (-)
1E
2E
%
Detect distorted flow profile, e.g., due to improper installation.
Detect interference in electrode circuit, e.g., failure of electrode
due to insulating coating or a collapsed liner (vacuum shock).
The electrode balance (EB) is calculated as the ratio between
the electrode AC voltages E1/E2 or E2/E1. This value is
displayed in [%]. To prevent false alarms, alarms are not
triggered for electrode AC voltages below 20 µV, regardless of
the alarm setting which has been selected.
The EB is measured without affecting the flow measurement in any way. To perform this
measurement, it is necessary to switch on one of the relevant errors or warnings in the
submenu "Diagnostics / Alarm Settings" (see page 82).
Important
The electrode zero point must be adjusted under the submenu "Diagnostics / Adjustment /
Electr. Zero Point"
(
see pa
g
e 85
)
.