Oval EX DELTA, EX DELTA-DIA, Руководство пользователя

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D-546-9-E
3. GENERAL
EX Delta 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.
OVAL’s many years of experience in the field shows up in the EX Delta Dia, another vortex meter, specifically
designed for liquids with a high resistance to contamination. This meter is best suited for processes where
ferrous meter components tend to become rusty, or where entrained foreign matter tends to build up. It
significantly reduces trouble that is common to other meter type or ordinary vortex meters, and realizes
consistent flow measurement over extended periods of time.
〈EX Delta Features〉
(1) A broad flow range with high metering accuracy.
(2) 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.
(4) A wide temperature and pressure range. Accepts most fluids, including liquids, gases and steam.
(5) Small pressure loss across the meter to save energy.
(6) Battery powered, requires no external power source (battery good for 7 years).
(7) Can monitor total flow (accumulated total flow, resettable flow) and instantaneous rate on a digital
display.
(8) Weathertight (IP65) and explosionproof construction makes it ideal for a local monitor dedicated flow
sensor.
(9) The sensor comes in fixed type and cartridge replaceable type: the replaceable sensor is justified by ease of
servicing, such as inspection and replacement, without the need of interrupting the fluid flow.
〈EX Delta Dia Features〉
(1) Proprietary diamond-section bluff body combined with a separate sensor prevents scale sedimentation or
material buildup to maintain consistent performance in contaminated fluid measurement. The sensor
element isolated from the process fluid and the absence of moving parts contributes to long life.
(2) Compatible with widely varying process temperature and pressure conditions.
(3) Withstands severe cleansing environments, including steam cleaning.