Oval Smart EX DELTA II Series, Instructions Manual

Page: 6 / 54

D-582-3-E
Features
() A broad flow range with high metering accuracy.
(2) The sensor isolated from the process fluid and simple meter design with no moving parts contributes
to long life.
(3) No loss of accuracy with age.
() A wide temperature and pressure range. Accepts most fluids, including liquids, gases and steam.
(5) Small pressure loss across the meter saves energy.
() Pipeline closure is not required in the event of an emergency.
() Output being pulses proportional to flow velocity makes totalization simple.
(8) Economy is evident when it comes to flow measurements in large diameter pipelines.
3. GENERAL
EX DELTA Ⅱ is a vortex flowmeter, making use of a piezoelectric sensor. Behind the bluff body in a
flowing fluid, von Karman vortices form and shed proportional to the rate of flow on alternating side of the
bluff body placed perpendicular to the stream of flow. A piezoelectric sensor picks up the frequency of
these vortices, which is used for flowrate measurement.
By detecting the flowrate of a section representative of the total flow across the pipeline with a probe
inserted into the pipeline, this insertion type EX DELTA Ⅱ measures the total flowrate. This type of meter
is ideally suited for flow measurements in large diameter lines.
The probe measures 50 millimeters in nominal diameter and consists of a bluff body containing a
piezoelectric sensor. Depending on the way the probe is installed in the main pipe, two types are
available: fixed and hottap. The latter design allows sensor inspection and replacement without
interrupting the process flow in the line.
This meter is full of intelligent features to review, set up, change compensated calculations, ranges,
parameters, with self diagnostics and loop test capabilities through communications with OVAL Smart
Communication Unit (Model EL230) and general-purpose Windows PC.
4. COMPONENT NAMES AND FUNCTIONS
Refer to Figs. . and .2 on the next page.
① Meter Body (probe):
Consists of a measuring pipe and a vortex shedding body (bluff body). As the metered material flows,
von Karman vortices form and shed behind the bluff body.
② Sensor (vortex sensing element):
Has a built-in piezoelectric sensor. All wetted parts are made of stainless steel for maximum life
expectancy.
③ Adapter (shaft assembly):
Connects the meter body with the preamplifier. To be installed on the pipeline with a flange. Also
serves to protect the sensor and dissipate heat.
④ Preamplifier:
Transforms changes in electric charges generated from the sensor into an output signal representing
the flowrate. Consists of the interface board, amplifier board, isolation board, CPU board, and display.
Output comes in five types － current pulse (factored/unfctored), open collector pulse (factored/
unfctored) and analog output.
⑤ Preamplifier PA25S (totalizer and digital indicator):
Physical orientation of the preamplifier is adjustable in steps of 0 deg. around the adapter axis (see
Sec. .0 on page ). The display can also be oriented in steps of 0 deg. within the preamplifier
housing.