UNIVERSAL COMPACT ORIFICE FLOW METER

COMPAFLOW

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Universal compact orifice flow meter

One-piece flow sensor, pressure tested as anassembly

Mass Flow version with optional, integraltemperature sensor and static pressuresensor

Integral impulse connections

Reduced cost of installation

Easy to specify

– combines a compact orifice flow sensor andsotiphicated converter

– improved reliability with no leaks to traceand rectify

– integral RTD and static pressure sensor fordirect reading of steam / gas mass andcorrected volume flow rates in a single unit

– no impulse piping installation required– provides repeatable DP connection across

installation locations

– only one piece to install– eliminates need to supply and connect

separate manifold, transmitter and impulsepiping

– single ordering code covers complete flowmeter

– only two orifice ratios for simplespecification process

Figure 1.Compaflow shown with

Yokogawa DP transmitter

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Compressed Air

Gas

Steam

Liquid

Volumetric flow

Mass flow

Net volumetric flow

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DatasheetDS-F-01

Compaflow

Benefits

Compaflow is an orifice-based flow meter with adifference – its advanced design greatly simplifiesinstallation and commissioning.

Compaflow is a stand-alone, orifice-based flow meterthat incorporates all the following features:

A wafer-bodied orifice carrier assembly with integralsquare-edged, concentric plate and corner tappingpointsOptional Integral 3-valve manifoldDP transmitter, factory-mounted onto the sensor /manifold and pre-configured for the applicationFully leak-tested and configured

Compaflow avoids many of the difficulties involved inthe sizing, selection, procurement, installation andcommissioning of conventional orifice plate installations.

With all the major components in one assembly,Compaflow eliminates the problems of sourcingmultiple components. Large savings in cost and timedue to the simplicity of design and installation.Integral transmitter and manifold with compacttapping connections eliminates the need to run andconnect impulse piping and offers:– guaranteed accuracy of positioning and

installation of the tapping points– reduced possibility of impulse line blockage

The assembly is pressure tested in the factory, givingthe user confidence that the connections betweenthe tapping points and the transmitter are completelyfree of leaksFactory configuration of the meter saves the usertime during commissioning and ensures that theflowmeter output span truly matches that of theapplication flowrateChoice of two discrete Beta ratio values, togetherwith the free sizing, selection and coding software,simplifies the sizing and selection processElement centralizing system ensures every meter isconcentric with its pipe, thus avoiding significantadditional metering errors

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Basic Principle of OperationDP devices work on a principle based upon the Law ofConservation of Energy, where a restriction in the fluidpath causes an acceleration in the fluid velocity with acorresponding increase in kinetic energy. The gain inkinetic energy is at the expense of pressure energy,resulting in a drop in fluid pressure across the narrowestpart of the restriction. The drop in pressure and the flowrate are linked by the following (albeit simplified)relationship:

Q = k DP

where Q = fluid flow ratek = a constant for that DP deviceDP = the pressure difference across the restriction

The DP generated for a given class of device depends onthe bore of the restriction. Many calculation standardsexist but in all cases the differential pressure producedby the restriction is larger than would normally beexpected. This effect occurs because a stream is unableto follow the contours of a restriction perfectly, resultingin a flow stream whose narrowest diameter (known asthe Vena Contracta) is less than the diameter of therestriction.

The Vena Contracta increases the velocity (andtherefore the kinetic energy) and this produces a largerdrop in pressure than would normally be expected.Some of the differential pressure generated isrecovered downstream of the unit but all DP devicesincur some loss, known as the 'irrecoverable pressureloss', and this is usually expressed as a percentage ofthe differential pressure. To correct for the VenaContracta effect, each device has a DischargeCoefficient; a multiplying factor of less than 1 that ispart of the calculation. Typically, the smaller the VenaContracta compared with the bore of the device, thelarger the deviation from expectations and hence thesmaller the coefficient.

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UNIVERSAL COMPACT ORIFICE FLOW METERCOMPAFLOW

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Figure 2

DatasheetDS-F-01

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UNIVERSAL COMPACT ORIFICE FLOW METERCOMPAFLOW

Versions

Compaflow V684

Compaflow is available in three versions:

– a compact flow meter for generalpurpose measurement in volumetric units (actualvolume). It uses the loop powered converter V684 andprovides a flow rate and total display on a single lineLCD. There is no output 4 to 20 mA.

Compaflow MS128 – a compact mass-flow meter,giving measurement directly in mass units. It usesthe Mass converter MS128 to measure DP,temperature and pressure. It provides a flowratedisplay and transmits 4 to 20 mA proportional to themass or corrected volume flowrate.

Compaflow V6200 – a compact flow meter forgeneral purpose measurement in volumetric units(actual volume). It uses the sophiticated converterV6200 and provides a flow rate and total display on 02LED lines. There is output 4 to 20 mA, Contacts,RS485...

Figure 3 Figure 4

Figure 5

DatasheetDS-F-01

Compaflow – a compact orifice flow meter withother DP transmitter from Yokogawa, Foxboro, E&H,ABB...It can be volumetric & mass measurement.LCD Display is optional. 4-20mA Output is standardwith HART communication

Figure 6

UNIVERSAL COMPACT ORIFICE FLOW METERCOMPAFLOW

DatasheetDS-F-01

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Specification – General

Fluids- Compressed Air, Gas- Saturated/Superheated Steam- Liquid

Line Sizes

Output signal

Output current limits (to NAMUR standard)

Alarm current

Power supply

Indicators

Compaflow V684:

25 mm, 40 mm, 50 mm, 80 mm, 100 mm, 150 mm,200mm (1 in., 11/2 in., 2 in., 3 in., 4 in., 6 in., 8 in.)

Two-wire, 4 to 20 mA, Low flow cut-off facility, OptionalHART communicationOptional RS485/Modbus communications (CompaflowV6200 & M126 only)

Overload condition:Lower limit 3.8 mA(configurable from 3.7 to 4 mA)Upper limit 20.5 mA(configurable from 20 to 22.5 mA)

Minimum alarm current 3.8 mA (configurable from 3.7 to4 mA)Maximum alarm current 22 mA (configurable from 20 to22.5 mA)Standard setting maximum alarm current

24VDC or 230VAC/50Hz

Indicator is standard for all versions.

Single line, 6-Digit LCD. Four keys for configuration andmanagement of device. Easy setup for quickcommissioning. Totalized and instantaneous flowindication. Display also indicates diagnostic messagesand provides configuration facilities.

Compaflow V6200:

Compaflow M126:

Double line, 6-Digit LED. Four keys for configuration andmanagement of device. Easy setup for quickcommissioning. Totalized and instantaneous flowindication. Display also indicates diagnostic messagesand provides configuration facilities.

Double line, LCD Display, optional back lit. Three keys forconfiguration and management of device. Easy setup forquick commissioning. Totalized and instantaneous flowindication. Display also indicates in/out transfer function,static pressure, sensor temperature and diagnosticmessages and provides configuration facilities.

Wetted materials

Process Connections

Temperature limitations

Orifice plate bore at 20 °C (68 °F):For Beta = 0.4

For Beta = 0.65

Orifice assembly,stem and manifold Optional: 316/

Converter sensor housing High impact plastic

Process isolating diaphragms 316/316L SS

Seals (transmitter to manifold) PTFE

Wafer body to fit between the following flange drillings:ASME B16.5 (ANSI) Class 150, 300 or 600DIN PN16, PN25, PN40 or Pn100

Pipeline centralization assured by centralizing tool(s)supplied with every unit as standard

Pressure limitations 100 bar (1450 psi) or as flangerating, whichever is the lower

Process –20 to 121 °C (–4 to 250 °F)–20 to 400 °C (–4 to 446 °F) for steam

Ambient –20 to 70 °C (–4 to 158 °F)

25 mm (1 in.) 10.66 mm (0.42 in.)40 mm (11/2 in.) 16.36 mm (0.644 in.)50 mm (2 in.) 20.99 mm (0.826 in.)80 mm (3 in.) 31.17 mm (1.227 in.)100 mm (4 in.) 40.90 mm (1.610 in.)150 mm (6 in.) 61.63 mm (2.426 in.)200 mm (8 in.) 81.10 mm (3.193 in.)

25 mm (1 in.) 17.32 mm (0.682 in.)40 mm (11/2 in.) 26.58 mm (1.047 in.)50 mm (2 in.) 34.11 mm (1.343 in.)80 mm (3 in.) 50.65 mm (1.994 in.)100 mm (4 in.) 66.47 mm (2.617 in.)150 mm (6 in.) 100.15 mm (3.942 in.)200 mm (8 in.) 131.78mm (5.188 in.)

304 stainless steel316L SS

Performance

Accuracy1%

Repeatability0.1%

Sensor Code Min Span (KPa) Max Span (KPa)

0A 0.35 35

02 0.70 70

03 1.00 100

07 2.00 200

Fitting Beta = 0.4 Beta = 0.65

Conical Reducer (2D-D) 5D 12D

Conical Expander (0.5D-D) 12D 28D

Single 90o Bend 16D 44D

2 off 90o bends in same plane 10D 44D

2 off 90o bends in different plane 50D 60D

DP Span for DPT490 Transmitter

Upstream Pipes Requirements to ISO 5167:2003

Where D = Pipe diameterDownstream = 5D

UNIVERSAL COMPACT ORIFICE FLOW METERCOMPAFLOW

DatasheetDS-F-01

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* Other DP Span can be specified when ordering

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Dimension Drawings

Figure 7.Compaflow shown

with DPT490

Size H J E (J/2) D (H-E)

25 (1”) 190.8 (7.51) 50.8 ±1 (2 ±0.04) 25.4 ±0.5 (1 ±0.02) 165.4 ±5 (6.51 ±0.2)

40 (1 1/2”) 213.2 (8.39) 73.2 ±1 (2.88 ±0.04) 36.6 ±0.5 (1.44 ±0.02) 176.6 ±5 (6.95 ±0.2)

50 (2”) 232.1 (9.13) 92.1 ±1 (3.63 ±0.04) 46.05 ±0.5 (1.81 ±0.02) 186.05 ±5 (7.32 ±0.2)

80 (3”) 267 (10.51) 127 ±1 (4.99 ±0.04) 63.5 ±0.5 (2.50 ±0.02) 203.5 ±5 (8.01 ±0.2)

100 (4”) 317.2 (12.49) 157.2 ±1 (6.19 ±0.04) 78.6 ±0.5 (3.09 ±0.02) 238.6 ±5 (9.39 ±0.2)

150 (6”) 375.9 (14.80) 215.9 ±1 (8.50 ±0.04) 107.95 ±0.5 (4.25 ±0.02) 267.95 ±5 (10.55 ±0.2)

200 (8”) 429.9 (16.92) 269.9 ±1 (10.63 134.95 ±0.5 (5.31 ±0.02) 294.95 ±5 (11.61 ±0.2)

Dimension Table - mm (inch)

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UNIVERSAL COMPACT ORIFICE FLOW METERCOMPAFLOW

DatasheetDS-F-01

Example model code V 80 L 50 07 V6200

Model

Volume Flow V

Mass Flow M

Size

25 25

40 40

50 50

80 80

90 90

100 100

150 150

200 200

Fluid

Liquid L

Gas G

Steam S

Beta ratio

0.4 40

0.65 65

Special (1) X1

DP Span Limit

0.35 .. 35 Kpa 0A

0.70 .. 70 Kpa 02

1.00 .. 100 Kpa 03

2.00 .. 200 Kpa 07

Other DP transmitter (2) X2

Indicating Totalizer

Loop powered indicator V684, panel mount V684

Sophiticated indicator V6200, panel mount V6200

Mass flow computer M126, panel mount M126

None (3) N1

Other (4) X3

Ordering Code

UNIVERSAL COMPACT ORIFICE FLOW METERCOMPAFLOW

DatasheetDS-F-01

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(1): Beta ratio calculated from Sizing program(2): This compaflow can be used with other DP Transmitters: Yokogawa, Foxboro,Rosemount, ABB, E&H...(3): May be specified when X2 was chosen in case the totalizer function is notrequired or other DP transmitter has got totalizing function.(4): Can be using with other totalizer

UNIVERSAL COMPACT ORIFICE FLOW METERCOMPAFLOW

Data

sheet

DS

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Daviteq Company Limited245 Hau Giang St., Ward5, Dist. 6Ho Chi Minh City, SR VietnamT e l : + 8 4 - 8 - 6 2 9 3 . 2 6 6 2F a x : + 8 4 - 8 - 6 2 9 3 . 2 6 6 3E m a i l : i n f o @ d a v i t e q . c o mH t t p : / / w w w . d a v i t e q . c o mPrinted in Vietnam (06.08) Daviteq 2008©

Compaflow is a registered trademark of Dai Viet Controls & Instrumentation Company Ltd.Modbus is a registered trademark of the Modbus-IDA organizationDaviteq is a registered trademark of Dai Viet Controls & Instrumentation Company Ltd.