Flowmeter - ERVIP.NT

OPERATING PRINCIPLE OF THE FLOWRATE TRANSDUCER

The transducer uses a vortex flow metering method. The oncoming  liquid flow (gas) forms vortex in the flowaround body that propagate alternately along back of each flowaround body (Karman path). The frequency of vortex shedding from the flowaround body is proportional to the flow velocity of the moving fluid.

These vortices cause pressure fluctuations on both sides of the flowaround body which are fixed by the sensitive element.

The element senses the pressure pulsations at a breakdown of each vortex and  converts them into an electrical signal that enters the electronic block. The electronic block after signal amplification, filtering, transformations and program  processing forms the output signals of the tranducer.

The flowmeters of the explosion-proof modification ERVIP.NT-Vn are general industrial in the explosion-proof casing "d" designed in accordance with the requirements for explosion-proof electrical  equipment of IIB, IIA subgroups according to GOST R IEC 60079-14.


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Measured fluid - liquid (water, oil emulsion), gas (natural, associated)

and other non corrosive for
flowmeter flowpath liquids and gases

Fluid parameters:

1. Temperature:

oC

 

- gas

oC

from -40 to +50

- liquid

oC

from -1 to +90

- high-temperature liquid

oC

from +1 to +150

2. Excessive pressure

MPa (kgf / cm2)

up to 4(40)

3. Operating absolute pressure of gas

Pa

> 90

4. Density at normal conditions 

kg/m3

> 0.6

5. Sediment content

mg/m3

< 50

6. Viscosity (for liquids)

m2/sec

< 500 × 10-6

 

 

 

 

 

 

 

 

 

Relative error limits of the transducer ERVIP DN 50/32 when measuring the volumetric flow rate:

Of liquid in straight sections:

2,0 - 2,5 m3 / h - ± 1,5%;

2,0 - 23 m3 / h - ± 1,0%;

Of liquid without straight sections:

2.0 - 2.5 m3 / h - ± 2.5%;

2.0 - 23 m3 / h - ± 1,5%;

For gas:

1.0 - 20 m3 / h - ±3%;

20-120 m3 / h - ±2.5%;

Usage of  flowmeters in metering stations without straight sections is allowed with a  reduction in the strength diameter of the flowmeter part (for  example, DN 50/32 confuser). In this case,  it is recommended to use the magnetically adjustable CMR-2Ex valve for flow rate control which provides the necessary flow velocity and flow rate through the flowmeter in the optimal range, and also excludes the  influence of vibrational and acoustic noise.

The value of the volumetric liquid flow rate for various flowmeter sizes.

Flow Transducer type

DN pipe/DN meter., mm

Volumetric flow rate, m3 / h

 

 

Qmin

Qo

Qmax

ERVIP.NT-50/25

50/25

0.5

1.4

14.0

ERVIP.NT-50/32

50/32

2.0

2.5

23.0

ERVIP.NT-50/40

50/40

3.0

4.0

36.0

ERVIP.NT-50/50

50/50

< 5.0

6.0

57.0

ERVIP.NT-80/65

80/65

7.0

10.0

96.0

ERVIP.NT-80/80

80/80

8.0

15.0

145.0

 

 

 

 

 

 

 

 

 

Gas volume rate value 

Flow Transducer type

DN pipe/DN meter., mm

Volumetric flow rate, m3 / h

 

 

Qmin

Qo

Qmax

ERVIP.NT-50/25

50/25

10.0

20.0

75.0

ERVIP.NT-50/32

50/32

20.0

30.0

120.0

ERVIP.NT-50/40

50/40

30.0

50.0

250.0

ERVIP.NT-50/50

50/50

50.0

100.0

500.0

ERVIP.NT-80/65

80/65

90.0

140.0

700.0

ERVIP.NT-80/80

80/80

130.0

200.0

1000.0






 

 

 

 

 

 

Notes: Qmin - lower limit; Qo - nominal flow rate; Qmax - upper limit; DN pipe - nominal diameter of the connecting pipe; DN meter - nominal diameter of flowmeter.






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