Burkert Type 8750 - Manual (Page 25)

I NSTALLATION
8750 - 23
• Parallel to this, the conveyance pressure (pressure at the outlet side of the FMR) is
monitored. For each reference point of the characteristic, the conveyance pressure and
the air flow are registered.
• Reading in is complete when after 60 sec the control valve is fully open, or the
conveyance pressure previously reaches the upper limit of the scaling.
• Air leakage compensation is now activated. The process value is now obtained from the
difference between the measured air flow and the air leak rate calculated from the
characteristic:
Q
conv. path
= Q
FMR
– Q
air leak
Deactivate leakage characteristic
Activate leakage characteristic
Start automatic determination of the leakage characteristic
Show the leakage characteristic display.
Reference points are displayed alternately as conveyance pressure
in mbar and air flow or conveyance speed in m
3 /h or m/s
respectively.
Display Description
TUNE 5
TUNE 4
:
TUNE 0 Countdown from 5 to 0 to the start of leakage determination
LEAK IN
LEAK P0
LEAK OPN
LEAK PAR Display of the momentarily running phase of leakage determination
(progress is indicated by a rotating beam at the left hand edge of
the display)
LEAK END Display flashes. Leakage determination successfully completed
L.ERR X Display on occurrence of an error
(Display on the right: error number, see chapter Maintenance and
Troubleshooting in the controller manual)