Table of Contents
Advertisement
Diagnosing and troubleshooting
8.2 Troubleshooting
Flowmeter recalibration
After you have removed and replaced the range spring, recalibrate the flowmeter and integrator.
(See the Integrator operating instructions for details.)
1. Perform the LVDT output zero procedure.
2. Perform an integrator zero and span calibration.
3. Perform a span adjust and factoring as required.
8.2
Troubleshooting
Every SITRANS sensing head is subjected to extensive quality assurance procedures to ensure
the highest possible degree of quality, reliability, and performance is achieved.
The following table indicates the probable cause, and proper course of action to be taken should
the specified fault symptom occur.
Integrator rate display doesn't
change when sensing plate is
moved.
Span adjustment does not have
enough range.
Measurement results are not
repeatable.
Accuracy varies with material
flowrate.
8.3
Linearity
To test linearity, at least 3 test weights are used. Each weight represents a different test rate.
Record the integrator rate display value associated with each test weight applied to the
flowmeter.
If all the recorded display values are accurate, the flowmeter measurement is linear.
36
Symptom
Wrong or bad integrator connec-
tion.
Viscous damper cover in ship-
ping position.
Integrator not prepared for op-
eration.
Range spring not suited to ap-
plication.
Sensing head not level.
Moving beam travel is mechani-
cally limited.
Leaf springs are damaged.
Material flow patterns vary.
Non-linear operation.
Cause
Refer to Connecting (Page 17).
Refer to Viscous damper
(Page 15).
Program and calibrate the inte-
grator.
Refer to Range springs
(Page 35).
Refer to Sensing head
(Page 13) and Sensing head
level test (Page 27).
Ensure moving beam does not
hit travel stops between -20%
and 150% flowrates.
Replace leaf springs, recalibrate
flowmeter and integrator.
Refer to the Applications section
of the flowmeter operating in-
structions
Refer to Linearity (Page 36).
Operating Instructions, 02/2016, A5E32880290-AB
Action
SITRANS WFS320
Advertisement
Table of Contents
Troubleshooting
