Coriolis Flowmeasurement System

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Products Solutions Services

Coriolis flowmeter

Introduction to the technology

Slide 1 Endress+Hauser


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Coriolis Measurement Principle

Coriolis Mass Flowmeter



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Overview of direct measuring variables

D = Phase shift

m = Mass flow

fR = Resonance frequency

r = Density

W = Resistance (PT1000) T = Temperature

~ mfR ~ ~ T




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Overview of calculated values

V = Volume flow

V = m/r

VN = Normvolume flow = Volume flow at fixed p and T

VN = m/rN (note: rN is a fixed value for each fluid)

c = ConcentrationConcentration can be calculated from density

see specific training (advanced module)

n = Viscosity

Viscosity can be calculated from oscillation damping. Viscosity

measurement is only available with the Promass I sensor

see specific training (advanced module)




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Basic meter construction

Process connection

Oscillation driving system

Transmitter

SensorPipe movementsensors

Electrodynamicsensors




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Features of Endress+Hauser Promass Coriolis sensors

Compact design Small construction, light weight

Standard 2nd containment (except E sensor) Robust construction, enhanced process security

Vibration immunity

Not affected by pipeline vibration

Self draining No clogging, hygienic versions available




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Promass: Insensitive to pipeline vibrations

Balanced measuring system

High operating frequency (typical 600 to 1000 Hz) no interference

of oscillation by pipeline vibration (normally around 50 to 250 Hz)

Tuning fork

zeros

tability

[kg/h

]

frequency [Hz]

Fisher-Rosemount ELITE C MF100Effect of interference vibration,0.5g, zero flow, tubes empty

26.7.96

-20

-15

-10

-5

0

5

10

15

20

0 50 100 150 200 250 300 350 400 450 500

Vibration effect of

competitor Coriolis

Vibration effect of

Endress+Hauser Promass




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Self draining design

Self draining design of each sensor No liquid stays inside

No sedimentation of solids

No corrosion

Less sensitive to clogging

EHEDG certified, 3-A approved

Self drainingSelf de-aerating




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Standard transmitter Promass 80

Aluminum or stainless housingIP67/NEMA4X standard

Operation (display optional)Push-button operation

2-line display, backlit

AccuracyUp to 0.1% measuring error

Fits all sensors

Standard transmitter for the most industries and applications


TestsCRN/PED Cat II/III, 3.1B, pressure

test

Ex Approvals

ATEX, FM, NEPSI, TIIS and CSA

(Zone 1 and 2)

Housing

-20 C ambient temperature

standard

-40 C ambient temperature optional

Remote electronics

Max. 20 m / 65 ftPower supply

20 to 55 V AC / 16 to 62 V DC

85 to 260 V AC, 50/60 Hz

Outputs

4-20 mA HART, passive pulse, status

in/out, PROFIBUS PA



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Flow accuracy specifications (all sensors)

All values in the table are base accuracies

Effects of zero point stability have to be added for each sensor

Sensor Mass flow Liquid

Volume flowLiquid

Mass flowGas

80 83 80 83 80 and 83

Promass F 0.1 0.05 0.2 0.15 0.35

Promass A 0.15 0.1 0.25 0.25 0.5

Promass E 0.3 0.25 0.45 0.45 0.75




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Zero point stability

Each flowmeter has a base accuracy (see previous sheet)

Additional error is caused by zero point stability: Defined by the design of the flowmeter

It reflects the imperfection of the sensor (due to mechanical limitation,

manufacturing tolerances etc.)

Influence is most significant in low flow conditions

Base accuracyInfluence of zeropoint stability




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Density accuracy specifications

Sensor model Standard calibrationSpecial density

calibrationField calibration

Promass F 0.0100 g/cm3 0.0010 g/cm

3 0.0005 g/cm3

Promass A 0.0200 g/cm3 0.0020 g/cm3 0.0010 g/cm3Promass E 0.0200 g/cm3 0.0020 g/cm3 0.0010 g/cm3




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Dimensions of Promass 80E compact version




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Dimensions of Promass 80E compact with EN flange types




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Dimensions of Promass 80E with ASME flange types




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Dimensions of Promass 80E remote version




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General application fields of Coriolis meters

Because of its versatile applicability it is virtually impossible to give

written guidelines on where to use Coriolis meters

All industries are using the technology in many applications

providing multi process variables and direct massflow

Promass flow meters are used for liquids, gas and sometimes even for

steam




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Coriolis installation considerations: full pipe (1)

The measuring tube(s) of a Coriolis meter must be kept full.

Promass triggers Empty pipe detection (EPD) warning if density

falls below defined limit.

Consider the following recommendations: Best mounting location:

In vertical pipeline with flow streaming upwards

Good alternative:

Horizontal orientation on a low point in the pipeline.




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Coriolis installation considerations: full pipe (2)

Consider the following restrictions: Avoid installation at the highest point of a pipeline.

Avoid installation directly upstream of a free pipe outlet in a vertical

pipeline.

If installation before a free pipe outlet is inevitable: Decrease nominal outlet diameter

(Pipe restrictor or an orifice plate).

Consult operating manual for recommended orifice sizes.




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Coriolis installation considerations: entrained solid

With curved measuring tubes and horizontal installation:

Entrained solids in liquids: do not install with curves pointing

downwards (risk of solids accumulating).

Steam and wet gas measurement: do not install with curves pointing

downwards (risk of condensate accumulation)




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Air entrainment

All (Coriolis) flowmeters are affected by entrained air.

Promass in combination with FieldCare can be used to detect

unknown gas entrainment problems in application (by tracking the

stability of the meters excitation current).

Promass F does not stall even if meter is run

empty full empty

Effects on measurement depend on the air distribution in the fluid.

Bubbles

Slug flow

Partial filling

Or any kind of combination



Coriolis Flowmeasurement System

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