Troubleshooting/FAQs
9.2 Diagnosing with PDM
66
SONO 3500 CT
Operating Instructions, 07/2019, VI.SH.P2.02
Gain step
The graph above shows which gain step to expect for a particular transducer distance (face
to face distance). The upper curve indicates the upper limit and the lower curve indicates the
lower limit.
The graph applies to perfectly aligned transducers in clean water, but takes into account the
expected variance from the converter and the transducers.
Gain step error conditions
Condition
Cause
15
•
No transducer (e.g. defective cable)
•
Empty pipe
High values
•
High damping (e.g. inhomogeneous media)
•
Unsuitable medium
•
Path angular misalignment
Unstable/fluctuating values
•
Air bubbles or solids in medium
•
Bad inlet conditions
Δ gain step between path 1 and path 2 > 1
(2-path systems only)
•
Bad inlet conditions
•
Inhomogeneous medium
•
Path angular misalignment
In case of angular misalignment between transducer faces, the gain step will increase as
shown in the table below:
Angular misalignment
Gain step increase
2°
1
3°
2
4°
3
5°
5
Flow velocity error conditions
Condition
Cause
Δ flow velocity values (between path 1 and path
2) > 1
(2-path systems only)
•
Bad inlet conditions (the higher the delta, the
worse the inlet conditions)
•
Disturbances in the pipe (bad flow profile)
Unstable/fluctuating values
•
Air bubbles or solids in media
•
Bad inlet conditions
The actual velocities for the paths should be stable, constant and smoothly changing values
between 0 and 10 m/s.
Содержание SONO 3500 CT
Страница 1: ...Ultrasonic Flowmeter Operating Instructions SONO 3500 CT 07 2019 Edition ...
Страница 2: ......
Страница 8: ...Table of contents 6 SONO 3500 CT Operating Instructions 07 2019 VI SH P2 02 ...
Страница 14: ...Introduction 1 5 Further Information 12 SONO 3500 CT Operating Instructions 07 2019 VI SH P2 02 ...
Страница 38: ...Electrical connection 5 5 Sealing of SONO 3500 CT 36 SONO 3500 CT Operating Instructions 07 2019 VI SH P2 02 ...
Страница 50: ...Commissioning 6 4 Commissioning via PDM 48 SONO 3500 CT Operating Instructions 07 2019 VI SH P2 02 ...
Страница 54: ...Functions 7 4 Hardware key 52 SONO 3500 CT Operating Instructions 07 2019 VI SH P2 02 ...
Страница 64: ...Service and maintenance 8 7 Battery disposal 62 SONO 3500 CT Operating Instructions 07 2019 VI SH P2 02 ...