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OIO 15en Edition 2020-05
Operating Instructions
Re-calibration of the flowmeters
Maintenance
Maintenance
Re-calibration of the flowmeters
KRAL flowmeters are fundamentally maintenance-free. However, despite the robust design flowmeters,
as mechanical meters, are also subject to a certain wear as time passes. In order to maintain the high
degree of precision, the manufacturer recommends carrying out the first recalibration after about one
year of operation in order to ensure the technical functionality. Further specifications can be made in
your quality management system. The results of the recalibration reveal the wear starting at the
measuring unit.
The interval at which recalibration is actually required depends strongly on the operating conditions of
the device. Under favorable conditions no significant change in the characteristics could be established
even after years of use in many cases. Conditions lying clearly above the nominal flow rate can,
however, result in excessive wear. Changes in the cross-section due to deposits or corrosive/abrasive
wear at the elements coming into contact with the flow are further factors that can result in a change to
the characteristics.
Recalibration and maintenance of your KRAL flowmeter ensures its measuring precision and technical
functionality. The manufacturer provides the factory calibration as standard. If higher requirements are
placed on the measuring instrument, an accredited calibration according to EN ISO/IEC 17025 is also
possible.
General information about mounting instructions
The following instructions are to be observed:
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Any mounting work may only be carried out by qualified personnel.
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Replacement of the measuring unit consisting of the set of screws, rolling bearings and pole
wheel may only be carried out in the factory.
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The flowmeter has to be recalibrated after the measuring housing or the rolling bearing has
been replaced.
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Observe the pick up operating instructions when replacing the pick up insert.
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Observe the temperature sensor operating instructions when replacing the temperature
sensor.
