Errors/Defects Caused By The Liquid - Bopp & Reuther DIMF 2.0 TVS Operating Instructions Manual

13.1 Errors/defects caused by the liquid

Symptom
Negative measuring error
Unstable indication
Positive measuring error
Long-term drift
Negative measuring error
Long-term drift
Indication does not change or
is moving too slow
Defects caused by sedimentation, corrosion or abrasion can often be seen after the density transducer
has been dismounted.
If necessary, the density transducer should be returned to the service department of Bopp & Reuther
Messtechnik for recalibration or an on-site adjustment (see section 9) should be performed using the
offset value K .
0
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Possible reason
Gas or air bubbles in the
liquid or inside the density
transducer
Deposits inside the
transducer
Corrosion
Abrasion
Flow velocity too low or zero
Remedy
Increase pressure in product line
Deaerate product line
Increase flow velocity in the transducer
Increase flow velocity to approx.
5 m/sec., for example
Flush away sediments inside the
density transducer with detergent
(ensure that wetted parts are corrosion-
resistant)
Clean transducer pipe various times
with a sphere and by applying the
appropriate pressure
Check material resistance of the
density transducer
Reduce flow velocity in the transducer
(recommende value < 1 m/s)
Open all shut-off valves
Increase flow velocity in the transducer
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