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D-160TS-7-E
5
2. OPERATING CONDITIONS
To maintain the stated high accuracy and long service life of the flowmeter, make sure that the operating
flow rate, pressure, temperature, etc., are held within the ratings specified. These ratings are stated in
the meter converter nameplate and "GENERAL SPECIFICATIONS" in this instruction manual.
Read them carefully before you place the meter in service.
[Example of Converter Nameplate]
3. GENERAL DESCRIPTION
The OVAL VORTEX FLOWMETER is a vortex flowmeter with thermistor sensors, designed for gas
measurement.
Downstream of the bluff body, von Karman vortices form and shed alternately proportional to the rate of
flow on either side of that triangular body placed perpendicular to the stream of flow. The thermistor sensors
detect the frequency of these vortices as temperature change (resistance change) and measures the flow
rate.
3.1 Features
(
1
)
The absence of mechanical moving parts and components subject to abrasion ensures long life and
continuous operation with no loss of accuracy with time.
(
2
)
By measuring actual flowrate, the measurement is insensitive to changes in temperature, pressure
and other physical properties.
(
3
)
Provides pulse output proportional to the flowrate to simplify totalization.
(
4
)
Small pressure loss saves energy.
(
5
)
Replaceable sensor facilitates maintenance and servicing without the need of interrupting the gas
flow.
(
6
)
Converter separated from the sensor body may be located anywhere for maximum ease of
maintenance irrespective of piping conditions.