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PDF FHG-1224 Data sheet ( Hoja de datos )
| Número de pieza | FHG-1224 | |
| Descripción | (FHG-1000 Series) SCREW GEAR FLOWMETER | |
| Fabricantes | Omega Engineering | |
| Logotipo |  |
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Hay una vista previa y un enlace de descarga de FHG-1224 (archivo pdf) en la parte inferior de esta página. Total 2 Páginas | ||
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SCREW GEAR FLOWMETER
For High Viscosity Liquids
FHG-1000 Series
A
U Pulsation-Free Measurement
U Lowest Pressure Loss for
High Viscosity
U Short Response Time
U Up to 1,000,000
Centistoke Viscosity
U High Accuracy and Wide Ranges
F
FHG-1000 flowmeters measure the flow rate based
on the screw pump principle. A pair of rotors fitted
precisely into the housing constitutes the measuring
element. An integrated gear and non-contact signal
pick-up system detects the rotations of the measuring
element and converts them to digital pulses. Together
with the housing walls, the rotor edges form closed
measuring chambers in which the fluid is transported
from the inlet to the outlet side. The fluid volume put
through within one main rotor rotation is the rotation
volume, which is divided by the sensing gear and
digitized, processed and output in the sensor module.
Sensor System Explanation
The non-contact pick-up system consists of two
GMR-bridges (sin/cos), which are located in a sensor
unit in cartridge design. It detects the movement of
the sensing gear and routes the sin/cos-signals to the
preamplifier electronics. The preamplifier electronics
digitize and amplify the sensor signals and multiply
them by a high-resolution interpolator using adjustable
settings. The square wave signals are bidirectional and
can be utilized by any evaluating instrument as well as
computers and PLC-controls. The resolution is
selectable in steps from factor 1 to 128. In case of an
1-channel evaluation, a separate directional signal is
available. An adjustable pulse filter can offset and
suppress negative flows (e.g. generated by
vibrations) while still in the device. The frequency of the
output signals is proportional to the flow (volume flow)
and depends on the respective flowmeter size. The
frequency range is from 0 to 100 kHz. The preamplifier
is protected against reverse polarity and incorrect
connection. It is suitable for fluid temperatures of
-30 to 120°C (-22 to 248°F) and is mounted directly on
the flowmeter.
FHG-1000 shown smaller than actual size.
Flowmeter Selection
For the trouble-free, safe and reliable operation of the
flowmeters, selecting the correct type and size is
critical. Because of the wide variety of applications
and flowmeter designs, the technical data in the
specifications are of a general nature. Certain
properties of the devices depend on type, size,
and measurement range as well as the liquid to
be measured. Please contact the Omega Flow
Department for detailed information about the
appropriate flowmeter for your particular application.
Electronics
A special sensor system detects any movement of the
pair of rotors or of the liquid column. For this purpose,
a precision gear connected to a shaft of the rotor pair
is scanned by a special magneto-resistive sensor. The
scanning sensor includes two GMR-bridges (sin/cos)
and is housed in a removable stainless steel cartridge
case together with a signal conditioning and amplifier
unit. The downstream electronics unit features a high-
resolution sin/cos-interpolator, which is adjustable with
10 different resolution factors. Furthermore, a
programmable signal filter is available as well, which
can offset unwanted negative pulse sequences up to
an adjustable degree. In addition, a signal for a
separate direction detection, e.g. in case of a
1-channel evaluation, is provided by the electronics.
Optionally, this output can be used for the detection of
excess flows and temperatures.
F-1
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