medidor ultrasonico krhon

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Ultrasonic

Flowmeters

GR

© KROHNE 08/2000 C 32 0000 03 E

Installation notes

Sizing guide Ordering guide

Variable area flowmeters

Vortex flowmeters

Flow controllers

Electromagnetic flowmeters

Ultrasonic flowmeters

Mass flowmeters

Level measuring instruments

Communications engineering

Engineering systems & solutions



Downpipe over 5 m (16 ft) length

Install air valve ⊗ down-stream of flowmeter (cavitation).

Long pipelineAlways install control and shutoff valvesdownstream of flowmeter (cavitation).

PumpsNever install flowmeter on pump suction side

(cavitation, gas formation).

Horizontal pipe runInstall in slightly ascending pipe section

Open feed or dischargeInstall meter in low section of pipe.

2 Installation notes

Inlet and outlet sections

ALTOSONIC V: inlet section 10x – 20x Øin

outlet section 5x Øin (Øin inside tube diameter)

. . . . . . . . . . . Sensor axes

(double-beam)

_ _ _ _ _ _ Sensor axis

(single-beam)

Install the sensor axis must be approximately horizontal if flowmeter

installed in sightly ascending or horizontal pipe runs.

Suggestions for installation To avoid measuring errors due to ai r inclusion, please obser ve

the following:

Measuring tube must be completely filled at all times.

Make sure there is sufficient room next to the pipe flanges for nuts

and bolts.

Vibration: support the pipeline on both sides of the flowmeter.

Large meter sizes, DN > 200 (> 8”): use adapter pipes to permit

axial shifting of counterflanges to facilitate installation.

Vortex or corkscrew flow: increase inlet and outlet sections or install

flow straighteners.

When mixing different fluid products, install flowmeter upstream

of mixing point or at an adequate distance downstream, minimum30 × DN (DN = meter size), otherwise output/display may be

unsteady.

Insulated pipline: do not insulate the flowmeters.

Highest point of pipe run(Air bubbles collect in measuring tube yielding faulty measurements)

Preferredlocations

Downpipe“Zero” flowvelocity.Line drained.Faultymeasurements,open discharge

open discharge

> 5 m

> 1

6 f t

UFM 500 GFM 700 UFM 600 UFM 800 W UFM 800 C

double-beam double-beam single-beam single-beam double-beam single-beam

Inlet section . . .

straight, undisturbed 10 × DN 20 × DN 10 × DN 20 × DN 10 × DN 10 × B

downstream of pump 15 × DN – 15 × DN 50 × DN 15 × DN –

downstream of fully opened control valve 10 × DN 20 × DN 10 × DN 50 × DN 10 × DN –

downstream of 2 quarter bends

on different levels 10 × DN 20 × DN 10 × DN 40 × DN 10 × DN –

downstream of 2 quarter bends on one level 10 × DN 20 × DN 10 × DN 25 × DN 10 × DN –

downstream of 1 quarter bend 10 × DN 20 × DN 10 × DN 20 × DN 10 × DN –

downstream of reducer ≥ 14° (α /2 ≥ 7°) * * * 15 × DN * –

downstream of a compressor or nozzle – 40 × DN – – – –

downstream of a pipe sectionwith v > 40 m/s or > 130 ft/s – 40 × DN – – – –

downstream of a fan – 30 × DN – – – –

Outlet section 5 × DN 10 × DN 5 × DN 10 × DN 5 × DN 5 × B

DN = meter size, inside diameter B = width of channel * no additional inlet run required

Installation Notes



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W el d - om

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O p en ch ann el

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3Sizing guide

The size of primary head should be selected to

provide a velocity of 2 to 3 m/s or 6 to 9 ft/s

for the full-scale range.

For liquids, the smallest full-scale range is

0.5 m/s or 1.5 ft/s and the largest 18 m/s

or 55 ft/s; for gases, 2 m/s or

6 ft/s and 20 m/s or 60 ft/s, respectively

For fluids with a solids content, the velocity

should be between 3 and 5 m/s or 9 and

15 ft/s to prevent deposits and minimize

abrasion.

Example: v in m/s

Nominal pipe diameter DN 150Desired measuring range 200 m3 /h

From the table we obtain for the flow velocity

of 1 m/s a flow rate of 63.617 m3 /h at

DN 150; for 200 m3 /h the flow velocity v is:

v =200 m3 /h

× 1 m/s63.617 m3 /h

v = 3.144 m/s

Flow tables

v = 1m/s

Meter size Flow rate Meter size Flow rate

DN mm m3 /h DN mm m3 /h

25 1.7671 400 452.39

32 2.8953 500 706.8640 4.5239 600 1017.950 7.0686 1700 1385.4

65 11.946 1800 1809.6

80 18.096 1900 2209.2100 28.274 1000 2827.4125 44.179 1200 4071.5150 63.617 1400 5541.8

200 113.10 1600 7238.2

250 176.71 1800 9160.9300 254.47 2000 11310350 346.36

v = 1ft/s

Meter size Flow rate Meter size Flow rate

inch US GPM inch US GPM

1 2.4480 16 626.69

11 /4 3.8250 20 979.2111 /2 5.5080 24 1410.12 9.7921 28 1919.2

21 /2 15.300 32 2506.8

3 22.032 36 3172.64 39.168 40 3916.85 61.200 48 5640.26 88.128 56 7677.0

8 156.67 64 10027

10 244.80 72 1269112 352.51 80 1566714 479.81

Example: v in ft/s

Nominal pipe diameter 6”Desired measuring range 1000 US GPM

From the table we obtain for the flow velocity

of 1 ft/s a flow rate of 88.128 US GPM at 6”

meter size; for 1000 US GPM the flow velocity

v is:

v =1000 US GPM

× 1 ft/s88.128 US GPM

v = 11.35 ft/s

Exact determination of flow velocity

For range setting purposes, the exact flow

velocity can be determined using the flow

table for each nominal pipe size.

Protection against jets of water fromany direction (hose-proof)

Protection against immersion in water

Protection against ingress of water under pressure (water-tight)

Protection against contact of any kind



Total protectionagainst ingress of dust (dust-proof enclosure)



IP 65

equivalent to NEMA 4 and 4X

IP 67

IP 68

equivalent to NEMA 6

Protection classes

to IEC 529/EN 60529

Sizing an ultrasonic flowmeter

IP _ _ _ _ 6 _ _ _ _ 5

_ _ _ 7_ _ _ 8


http://slidepdf.com/reader/full/medidor-ultrasonico-krhon 4/114 Sizing guide

A primary head with a smaller meter size may

prove to be more economical for pipe runs

with a low flow velocity. The pressure loss

resulting from pipe reduction/expansion and

from the greater velocity in the primary head

can be calculated as follows:

Pressure loss in mbar

(1) Pressure loss, reducing section∆p1 = ρ × ζ1 × v2

22

(2) Pressure loss, primary head

∆p2 = ρ × ζ2 × v22

2

(3) Pressure loss, expanding section

∆p3 = ρ × ζ3 × v12

2

Total pressure loss is:∆ptot. = (∆p1 + ∆p2 + ∆p3) × 0.01 [mbar]

ζ1ζ3 nondimensional quantities as afunction of the Reynolds number(see diagrams)

ζ2 nondimensional quantity:0.02 for KROHNE flowmeters

ρ density in kg/m3

d1, d2 pipe l.D. in metres and inches

v1, v2 flow velocity in m/s and ft/s

The reducing angle (α) should not exceed

8° (equivalent to α /2 = 4°), otherwise

measuring accuracy may be affected. If the

reducing angle is greater, a straight inlet

section must be fitted between reducing

socket and primary head.

For the expanding section, the optimum angle of expansion is α = 8°.

ζ at α = 8°

d1 /d2 1.2 1.3 1.4 1.5 1.6 1.7 1.8 1.9 2.0

ζ1 0.018 0.023 0.0255 0.028 0.03 0.0308 0.0315 0.0323 0.0332

ζ3 0.01 0.02 0.07 0.15 0.26 0.43 0.64 0.9 1.25

Reducing section Expanding section

Pressure loss in inches w.c. (water column)

(1) Pressure loss, reducing section∆p1 = ρ × ζ1 × v2

2 × 3.654 × 10 -42

(2) Pressure loss, primary head

∆p2 = ρ × ζ2 × v22 × 3.654 × 10 -4

2

(3) Pressure loss, expanding section

∆p3 = ρ × ζ3 × v12 × 3.654 × 10 -4

2

Total pressure loss is:∆ptot. = (∆p1 + ∆p2 + ∆p3) [inches w.c.]

Pressure Loss Calculation



B a ck g

r o un d

F l ow t u b e s

U F M 5 0 0

C l am p- on

U F M 6 0 0 / 6 1 0

W el d - om

U F M 8 0 0 W

O p en ch ann el

U F M 8 0 0 C

G a s-

f l ow t u b e

G F M7 0 0

C u s t o d y

t r an sf er

A L T O S ONI C V

C al i b r a t i on

I n s t

al l a t i on

n

o t e s


Or d er i n g

g ui d e

5Sizing guide

Notes


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Ordering guide



B a ck g

r o un d

F l ow t u b e s

U F M 5 0 0

C l am p- on

U F M 6 0 0 / 6 1 0

W el d - om

U F M 8 0 0 W

O p en ch ann el

U F M 8 0 0 C

G a s-

f l ow t u b e

G F M7 0 0

C u s t o d y

t r an sf er

A L T O S ONI C V

C al i b r a t i on

I n s t

al l a t i on

n

o t e s


Or d er i n g

g ui d e

7Ordering guide

Ordering guide



Ordering guide



B a ck g

r o un d

F l ow t u b e s

U F M 5 0 0

C l am p- on

U F M 6 0 0 / 6 1 0

W el d - om

U F M 8 0 0 W

O p en ch ann el

U F M 8 0 0 C

G a s-

f l ow t u b e

G F M7 0 0

C u s t o d y

t r an sf er

A L T O S ONI C V

C al i b r a t i on

I n s t

al l a t i on

n

o t e s


Or d er i n g

g ui d e

9Ordering guide

Ordering guide



Ordering guide



B a ck g

r o un d

F l ow t u b e s

U F M 5 0 0

C l am p- on

U F M 6 0 0 / 6 1 0

W el d - om

U F M 8 0 0 W

O p en ch ann el

U F M 8 0 0 C

G a s-

f l ow t u b e

G F M7 0 0

C u s t o d y

t r an sf er

A L T O S ONI C V

C al i b r a t i on

I n s t

al l a t i on

n

o t e s


Or d er i n g

g ui d e

Ordering guide

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