Kobold DON -2/4, Operating Instructions Manual

Page: 21 / 65

DON
DON K36/1222 page 21
8. Commissioning
The piping MUST be flushed of debris before installation. Debris such as slag from
welding, grinding dust, rust, pipe tape or sealing compound are common within
new piping installations and will damage the flowmeter if not flushed or filtered from
the process piping before installation and operation.
Before commissioning, the line should be filled slowly and carefully with the
medium.
A by-pass system is common for frequent system flushing or frequent meter
removal. If a by-pass system is not practical or possible, removal of the gears
before flushing is necessary (refer to section 9.1 “Disassembly of Pulse meter”).
For proper operation the flowmeter must be purged of air. During long periods of
inactivity or after a flushing, air may be in the piping. Elimination of the air may be
achieved by operating the meter at a low flow rate until all the air is eliminated.
Damage may occur to the flowmeter if it is run above the maximum rated flow rate
or if the maximum differential pressure of 15 psi (1 bar, 100 kPa) is exceeded.
After mechanical and electrical installation according to the guidelines set forth
within this user manual, the DON flowmeter is ready for operation.
Warning!
Risk of damage by blocking of measuring mechanism.
A missing count signal may indicate a blocked measuring
mechanism. The resulting increase in pressure before the device
can lead to further damage to the unit and / or the plant. Remove
the unit or shut down the plant immediately, if an unplanned
absence of the counter signal takes place.
Eliminate the cause of the malfunction.