KROHNE ALTOSONIC V12 EN - Manual (Page 73)

SERVICE
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ALTOSONIC V12
www.krohne.com 04/2013 - 4002643502 - MA ALTOSONIC V12 R02 en
8.1 Periodic maintenance
The ultrasonic gas flowmeter does not contain any moving parts. During operation no
maintenance will be required such as lubrication or replacing parts that wear out. Therefore
during normal operation there will be no need to disassemble the meter in order to gain access
to the inner parts of the meter.
It is however good practice to make a log file on regular basis, refer to Logging data from a
flowmeter on page 66. It is not to be expected that wear or tear takes place but external
influences such as an overflow in a separator or a process failure in a gas treatment plant, may
cause a fouling of the meter which may result in deviations. By making a log file on regular basis
such a failure can be pinpointed in time, and as such the financial consequences can be correctly
adjusted. The ALTOSONIC V12 also has on board diagnostic features that will alert the operator
in case of malfunctioning. In a log file information will be stored with much more detail.
8.2 Cleaning
In case of exceptional growth of contamination inside the meter body, the ultrasonic gas
flowmeter may need dismantling and cleaning.
DANGER!
In case of malfunction, it is recommended to call for support of the manufacturer or assistance
of a trained and qualified service technician, in order to address the problem and to identify the
parts that may need to be replaced, in case the meter itself causes the problem.
As a general rule, in order to maintain the explosion safety, removing the covers from the
As a general rule, in order to maintain the explosion safety, removing the covers from the As a general rule, in order to maintain the explosion safety, removing the covers from the As a general rule, in order to maintain the explosion safety, removing the covers from the
electronics enclosure or from the meter body shall only be performed after the power supply
electronics enclosure or from the meter body shall only be performed after the power supply electronics enclosure or from the meter body shall only be performed after the power supply electronics enclosure or from the meter body shall only be performed after the power supply
has been switched off or disconnected. In addition to that it shall be verified that no explosive gas
has been switched off or disconnected. In addition to that it shall be verified that no explosive gas has been switched off or disconnected. In addition to that it shall be verified that no explosive gas has been switched off or disconnected. In addition to that it shall be verified that no explosive gas
is present at the time the covers are opened or removed.
is present at the time the covers are opened or removed. is present at the time the covers are opened or removed. is present at the time the covers are opened or removed.
Before the meter is powered up again it shall be verified that the covers (and gaskets if Before the meter is powered up again it shall be verified that the covers (and gaskets if Before the meter is powered up again it shall be verified that the covers (and gaskets if Before the meter is powered up again it shall be verified that the covers (and gaskets if
applicable) are reinstalled properly. The nuts that fasten the covers on the meter body shall be
applicable) are reinstalled properly. The nuts that fasten the covers on the meter body shall be applicable) are reinstalled properly. The nuts that fasten the covers on the meter body shall be applicable) are reinstalled properly. The nuts that fasten the covers on the meter body shall be
tightened well enough to make sure that the gaskets provide a protection degree of at least IP
tightened well enough to make sure that the gaskets provide a protection degree of at least IP tightened well enough to make sure that the gaskets provide a protection degree of at least IP tightened well enough to make sure that the gaskets provide a protection degree of at least IP
54, keeping moisture out of the space behind the covers. (The rubber gasket shall be slightly but
54, keeping moisture out of the space behind the covers. (The rubber gasket shall be slightly but 54, keeping moisture out of the space behind the covers. (The rubber gasket shall be slightly but 54, keeping moisture out of the space behind the covers. (The rubber gasket shall be slightly but
noticeable compressed, the torque applied on the nuts will then be approximately 5 Nm. )
noticeable compressed, the torque applied on the nuts will then be approximately 5 Nm. ) noticeable compressed, the torque applied on the nuts will then be approximately 5 Nm. ) noticeable compressed, the torque applied on the nuts will then be approximately 5 Nm. )
The screw thread of the reinstalled covers of the electronics enclosure shall be completely
engaged. The cover shall be closed by clockwise rotation until resistance will be sensed, to a
level that the cover effects a gentle pressure on the o-ring sealing, in order to prevent
penetration of moisture (according to a protection degree of IP66/67). Finally the interlocking
device shall be reinstalled.
For more information about the interlocking device, refer to Opening and closing covers on page
24
.