FSM4000
ELECTROMAGNETIC FLOWMETER | OI/FSM4000-EN REV. E
99
Determining the E1 and E2 electrode AC voltage
Figure 57
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, you need to power-up one of the
relevant errors or a warning in the submenu ‘Diagnostics / Alarm
Settings’ (see
on page 85).
Note
The electrode zero point must be adjusted in the submenu
‘Diagnostics / Adjustments / Electr. Zero Point’ (see
Determining the electrode balance
E
1 ≥ E2 → EB =
2
E
1
E
%
E1 < E2 → EB = (
-)
1
E
2
E
%
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, you need to power-up
one of the relevant errors or a warning in the submenu
‘Diagnostics / Alarm Settings’ (see
on page 85).
Note
The electrode zero point must be adjusted in the submenu
‘Diagnostics / Adjustments / Electr. Zero Point’ (see
on page 94).
