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promesstec GmbH
I Niedersachsenstraße 4 I D-48465 Schüttorf I Tel.:+49 (0)5923/ 90 229 0 I Fax:+49 (0)5923/ 90 229 29
E-Mail: [email protected] I Internet: www.promesstec.com
High temperature pipeline
If the temperature of the measuring liquid is higher than 100°C, it is necessary to
compensate for the forces caused by linear expansion. If a short tube is used, a
flexible seal should be used. If a long pipe section is used, flexible components such
as bends should be used.
Electrodes
The electrode material must be selected according to chemical resistance to the
liquid to be measured. The purity of the electrodes may have an influence on meas-
urement accuracy, their heavy foulness may cause even the interruption of the
measuring function (isolation from the liquid). It is not necessary to clean the elec-
trodes right after delivery before their installation in the pipeline. If the electrodes
indicate signs of foulness, clean them with a soft cloth or use a chemical cleaning
agent. Mind damaging to the lining! During routine operation, in case of a great ma-
jority of liquids, it is not necessary to clean the flow meter for the entire operation
period of the flow sensor; self-cleaning by flow of the liquid is sufficient (recom-
mended velocity is over 2 m/sec).
PTFE, PFA, EFTE lining
The installation is carried out at the lowest point of the pipes to avoid negative pres-
sure. The PTFE coating must not be damaged under any circumstances. The pro-
tective caps must not be removed until just before installation between the flanges.
Installation check
After installation of the flow sensor in the pipeline, the following must be checked:
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According to the name plate, if there is a relevant meter in the given
measuring point (pressure, temperature, dimension, etc.).
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If the direction of the arrow on the device is in agreement with the direc-
tion of the flow in the pipeline.
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Correct position of the measuring electrodes (horizontally).
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Correct position of the electrode for empty pipeline detection (up).
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If all bolts (screws) are tightened properly.
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If earthing rings are used, then their correct installation and connection
with the sensor.
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Accuracy of flow sensor earthing.
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Accuracy of execution of the pipeline calming section lengths
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If the sensor is protected against vibrations and mechanical damage.
