6-3
IM 01F06A00-01E
6. OPERATION
6.1.8 Power Failure
When a power failure occurs, the totalized value will be
protected by EEPROM (Electrically Erasable Programmable
ROM). But during a power failure, the vortex flowmeter
stops and also the totalizing will stop.
After a power is recovered, the vortex flowmeter and the
totalizing start to work automatically.
EEPROM doesn’t need a battery for backup.
6.2 Adjustment for Manual Mode
digitalYEWFLO does not need the initial adjustment because
digitalYEWFLO is always adjusted by itself automatically.
These adjustments should be done in case that
indicator reads over zero at zero flow.
6.2.1 Low Cut Adjustment
Adjust to noise elimination or zero flow in the low flowrate
(or low frequency) range.
The settable range for low cut flowrate is to half of mini-
mum flowrate.
6.2.2 Tuning
This adjustment should be done according to a flow figure
shown below.
START
Is it zero flow?
No
No
Stop flow to be zero
Yes
Yes
Set "TUNING AT ZERO"
of "K25:N.B MODE"
Wait more than 30 seconds
Ensure the complete of the
tuning function.
Is indication reads zero
at zero flow?
Finishing the tuning
functios
Retry the tuning and ensure
the pipeline conditions?
Ensure TLA value
F060201.EPS
If this adjustment is executed, the following value is
changed.
K25:N.B MODE = MANUAL
K26:NOISE RATIO=Constant value
Minimum flowrate is increased when TLA value is
changed form initial value.
