Measured Value Error - Fuji Electric FSZ Instruction Manual

4.3.3. Measured value error

Condition
The measured value is
displayed as "-" (minus).
Abnormal fluctuation in
measured values
constant flow rate
The measured values are
not changing even though
the flow rate is changing.
(STATUS is red)
The measured value does
not reach zero even when
the fluid is stopped.
There is an error in the
measured value.
The measured
temperatures values are
not changing even
though the temperature
rate is changing.
Cause
 That is actually how it flows.
 Straight pipe is not long enough
at
 There are pumps, valves, or other
things that disturb the flow in the
vicinity.
 Actually, there is pulsation in the
fluid.
Refer to "4.3.2 Error and countermeasures when an alarm is displayed".

Fluid is flowing in the pipe.

When performing zero adjustment

When the fluid stops, the piping
will be either not full or empty.
(STATUS: Red)

The entered piping specification
is different from the actual one.

The straight pipe is not long
enough (Refer
Conditions on straight pipe").

The inside of the piping is either
not full or has deposits of muddy
sand.
 Hardware failures
Change the flow direction setting.
(Refer to "3.8.1Piping parameter setting
method")
Move to a location where you can secure
the length in "2.1.1 Conditions on straight
pipe".
Mount it at least 50 D apart from these
things.
Increase the response time using the
damping setting. ("3.9.1Damping")
This is normal.
● Perform zero adjustment again when
This is normal.
A 1% difference in the inner diameter will
result in an error of approximately 3% or
more.
● Please enter it correctly.
Find a different location for mounting the
to "2.1.1 sensor. (Go upstream of the object of
disturbance)
Ensure that there are no pumps, valves,
junction pipes, etc.
within 30 D upstream that significantly
disrupt the flow.
● Mount the flowmeter at various
There tends to be much build-up at
locations with small cross-sectional
area.
● Move it to the vertical piping.
Go to "4.3.6.Hardware failure
countermeasures"
- 40 -
Countermeasure
the fluid has completely stopped.
angles at the piping cross-section,
and finally mount it at a location that
produces the average measured
value.