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(1) Diagnosis of no/weak reception and wave receipt shape error
In the case of no/weak reception or wave receipt shape error, the cause is considered to be a wrong piping parameter
setting value, improper installation, problem of fluid/piping, or flowmeter failure. Check the following in order.
Wrong piping parameter setting value
The outer diameter setting value is wrong.
The wall thickness setting value is wrong.
The kind of fluid is not set to steam.
The sensor mounting method is not set to N method.
The serviceman parameter has been changed from the
factory setting (if the device has been installed by our
serviceman).
Improper installation
The straight pipe length is below "3.2.1 Conditions on
straight pipe".
For horizontal piping, the sensor is not mounted
horizontally or within ±45° from the horizontal surface (for
vertical pipes, the sensor may be attached to an arbitrary
position on the outer perimeter).
The sensor is mounted on the welded part of the piping.
The sensor is not closely attached to the piping.
The sensor mounting direction is wrong.
The sensor mounting dimension is wrong (50, 65, and 80 A
are 70 mm, and 100 A is 90 mm).
The holder pin is not fit to the V-groove of the sensor.
The bracket of the mounted sensor is tilted.
Acoustic coupler is not applied to the sensor (and the
noise elimination frame), or the acoustic coupler is
insufficient.
The sensor cable is not connected to the pre-amplifier.
The connection of the dedicated signal cable is poor.
The sensor is not covered with a thermal insulating
material.
The sensor may be affected by the external
environmental temperature, causing measurement failure
in some cases.
Cause
Cause
Input the correct value (see "4.6 Checking and Setting of
Piping Specifications/Detector").
Ask our serviceman to input the correct value or initialize
the memory.
Install the device again to a place where the straight pipe
length is satisfied.
Mount the sensor again on a horizontal place or a place
within ±45° from the horizontal surface (see "5.2
Selecting the mounting location").
Mount it again avoiding the welded part (see "5.2
Selecting the mounting location").
Mount the sensor correctly again (see "5.5 Sensor
mounting bracket mounting").
Mount the sensor correctly again (see "5.6 Sensor
mounting bracket mounting").
Mount the sensor correctly again (see "5.1.2 Mounting
dimensions diagram").
Mount the sensor correctly again (see "5.6 Sensor
mounting bracket mounting").
Mount the sensor mounting bracket again.
Mount the sensor correctly again (see "5.6 Sensor
mounting bracket mounting").
Connect the sensor cable to the pre-amplifier again.
Connect the dedicated signal cable again. Insert the
dedicated signal cable all the way in, and then tighten the
screw (see "5.8 Wiring connection").
Keep the temperature of the sensor with a thermal
insulating material.
－111－
Remedy
Remedy
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