34 OIO 14en Edition 07/2017 Operating Instructions
Safety instructions on maintenance
Maintenance
Maintenanc e
Safety instructions on maintenance
Required maintenance
Flowmeters are fundamentally maintenance-free. Under observance of the operating limits, see
"Technical data", page 8, 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. In the case of liquids with higher abrasiveness (e.g. heavy oil with catalyst
residues, plastic components with fillers, etc.) strongly accelerated wear can occur in the flowmeter.
Notice:
In cases of doubt the manufacturer recommends already carrying out the first inspection of the
flowmeter after twelve weeks operation time.
Signs of progressive wear of individual flowmeter elements:
Tab. 1 Check table for required maintenance
1. Check the flowmeter visually and acoustically every four weeks.
2. Check for signs of wear as listed in the table above and eliminate the cause.
Re-calibration of the flowmeters
In order to maintain the high measuring precision of the flowmeter, the manufacturer recommends
carrying out the first re-calibration after about one year of operation. The results reveal any wear starting
on the measuring unit. The interval at which recalibration is actually required depends strongly on the
operating conditions of the device.
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.
The following safety instructions must be observed during all the repair work:
► All the work may only be carried out by authorized qualified personnel.
► Wear protective clothing during all the work.
► Replacement of the measuring unit consisting of the set of screws, roller bearings and pole wheel
may only be carried out in the factory.
► The flowmeter has to be recalibrated after the measuring unit or the roller bearing has been
replaced.
► Observe the pick up operating instructions when replacing the pick up insert.
► Observe the corresponding operating instructions when replacing the temperature sensor
insert.
► Do not twist the dry sleeve. The guarantee for the flowmeter expires if the red sealing point is
damaged.
► Also observe the general drawings during all the work at the flowmeter, see "General drawings",
page 46.
Finding Cause Remedy
Increased running noises Incipient damage to bearing Replace the bearing.
Leakage Damage to sealing Replace the seals or dry sleeve.
Measured values not
realistic
see "Fault table", page 45 see "Fault table", page 45
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