GPI PVDF Anweisungen Seite 3

A typical back pressure of 5 to 50
PSI (0.34 to 3.4 bar) will prevent
cavitation. Create back pressure
by installing a control valve on the
downstream side of the meter at the
proper distance detailed above.
Foreign material in the liquid being
measured can clog the turbine's
rotor and adversely affect accuracy.
If this problem is anticipated or
experienced, install screens to filter
impurities from incoming liquids.
To ensure accurate measurement,
remove all air from the system before
use. To purge the system of air:
1. Ensure some back pressure on
the turbine.
2. Open the discharge valve
or nozzle and allow fluid to
completely fill the system. Make
sure the stream is full and steady.
3. Close the discharge valve or
nozzle.
4. Start normal operations.
Each turbine contains a removable
back coverplate. Leave the coverplate
installed unless accessory modules
specify removal.
Connections
1. To protect against leakage, seal
all threads with an appropriate
sealing compound. Make sure
the sealing compound does not
intrude into the flow path.
2. Make sure the flow direction
arrow near the outlet is pointed
in the direction of the flow.
3. Install union ring over pipe end
prior to installing pipe fitting.
4. Install pipe fittings on pipe ends,
and tighten.
5. Tighten union ring to the turbine.
Make sure O-ring is positioned
in housing ends. Do not use a
wrench or pliers. Hand tighten
only.
NOTE: If connecting to new male
threads, burrs and curls can
adversely effect accuracy.
Correct the problem prior to
turbine installation.
MAINTENANCE
Verify Accuracy
Before use, check the turbine's
accuracy and verify calibration.
1. Make sure there is no air in the
system.
2. Measure an exact known volume
into an accurate container.
3. Verify the volume against the
readout or recording equipment.
NOTE: If necessary, use a correction
factor to figure final volume.
For best results, accuracy should
be verified periodically as part of a
routine maintenance schedule.
Remove the Turbine
WARNING
During turbine removal, liquid
may spill. Follow the liquid
manufacturer's safety precau-
tions for clean up of minor spills.
1. Ensure all liquid is drained from
the turbine. Wear protective
clothing as necessary.
2. Loosen both union rings at the
ends of the turbine.
3. If the turbine is not immediately
installed again, cap lines as
necessary.
Replace Internal Parts
1. Remove the turbine from the
system. See Figure 2.
3