Flomec G Series Manuale d'uso del prodotto - Pagina 12
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Locating the Problem
To determine the location of the problem, whether it is occurring at the turbine
flowmeter or at the electronic readout device, disconnect the cable assembly from
the magnetic pickup and connect the cable from the portable rate indicator onto
the magnetic pickup. (Refer to Figure 6.)
Hand-held
Indicator
Checking the Magnetic Pickup
To determine the status of a hermetically sealed, two-wire lead, or standard
magnetic pickup, simply remove it from the turbine flowmeter, and using an ohm
meter, measure the ohm resistance by placing the leads of the ohm meter on each
pin of the magnetic pickup. (Refer to Figure 7.)
NOTE: It is recommended that the ohm resistance be measured before installing
a used magnetic pickup.
Checking the Turbine Flowmeter
Once it has been determined that the magnetic pickup is functional and there is no
output displayed on the portable rate indicator, it can be concluded that the
problem lies within the turbine flowmeter. Remove the turbine flowmeter from the
process line. DO NOT remove the internals at this time.
TROUBLESHOOTING
The portable rate indicator will display the
instantaneous rate of flow through the
turbine flowmeter. If the rate displayed is
equal to the rate of the process, then
both the magnetic pickup and the turbine
flowmeter are operational. The problem
will be located in either the cable
assembly or the electronic readout
device
When there is no rate displayed on the
portable rate indicator, the problem may
be caused by a defective magnetic pickup
or turbine flowmeter.
If the ohmmeter reads 1400 ohms ±20%,
then the magnetic pickup is good and
should NOT be replaced. If the ohmmeter
reads less than 1000 ohms, install a new
magnetic pickup. DO NOT throw the old
magnetic pickup away. Failure of the
magnetic pickup may have been caused
by moisture trapped inside. In some cases
when the magnetic pickup is allowed to
dry, it has become completely functional
and can be reused. When the ohmmeter
reads in excess of 1700 ohms, the
magnetic pickup is defective and should
be discarded.
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