Coriolis Mass Flow Meter

CMM

Coriolis Mass Flow Meter CMM

Construction

Function The Coriolis Mass Flow meter CMM contains oscilating measuring tubes which make use of the Coriolis force effect. The mass flow entering through the inlet of the flow meter is distributed by the flow-distributor to the measuring tubes bended parallely and symmetrically. The measured medium after flowing through the measuring tubes is collected in the meter body and is leaving the meter through the outlet. Due to an electromagnetic oscillating coil the symmetrical constructed pair of measuring tube is oscillating continuously and symmetrically at its momentary resonance frequency. Two sensor coils are fixed at the pipes symmetrically, sensing the symmetry of the oscillation. In flowless condition the electric signal of the two coils are sine wave signals identical in amplitude and in phase. In case a mass flow is started through the pipes, the symmetry of the oscillation is disturbed. Due to this sine wave signal of the sensor at one side is shifted in phase from the sine sine wave of the sensor at the other side. The value of the phase shift is directly proportional to the mass flow.

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With the signal processing unit C-Mass the signals of CMM are received and processed. As output signals frequency, current output or serial interface are available. The sensor can be operated in hazardous areas. In this case a special zener barrier unit has to be inserted between the electronic unit and the mass flow sensor. The protection mode of the measuring system is: II (2) G [Ex ib] IIB [05 ATEX 034)

KRACHT GmbH · Gewerbestr. 20 · 58791 Werdohl, Germany · fon +49 (0) 23 92 / 935-0 · fax +49 (0) 23 92 / 935 209 · web www.kracht.eu · mail [email protected]

Coriolis Mass Flow Meter CMM

Technical Data

General Characteristics Ambient temperature

-- 50 °C … + 70 °C (-- 58 °F … + 158 °F)

Medium temperaturer

-- 50 °C … + 150 °C (-- 58 °F … + 302 °F) with remote electronic unit -- 50 °C … + 80 °C (-- 58 °F … + 176 °F) with compact electronic unit -- 20 °C … (-- 4 °F … ) according to Ex classification

Material

Stainless steel 1.4541 (316 L)

Degree of protection

IP 65

Electrical Characteristics Output signals

Frequency (max. 10 kHz) Current (max. 20 mA) Serial interface (RS 232 or RS 485/422 with MODBUS RTU printout)

Operating voltage

19… 29 VDC (max. 150 mA)

Ambient temperature

-- 50 °C … + 70 °C (-- 58 °F … + 158 °F)

Degree of protection

IP 65

Flow rate Type CMM CMM CMM CMM CMM CMM CMM CMM CMM

0.15 0.3 0.5 1 3 6 14 40 80

Accuracy Max. flow rate [kg/min]

The maximum error of the measurement calculated as follows:

2.5 5.0 8.5 17.0 50.0 100.0 233.0 667.0 1334.0

h = ± 0.2 ± 5/q (%) h q Q Qmax

by: q = Q / Qmax x 100 (%)

maximal error of measurement related to the measured value (%) flow rate (%) mass flow to be measurement (kg/h) maximal mass flow (kg/h)

The maximum final value error is ± 0.05 %

KRACHT GmbH · Gewerbestr. 20 · 58791 Werdohl, Germany · fon +49 (0) 23 92 / 935-0 · fax +49 (0) 23 92 / 935 209 · web www.kracht.eu · mail [email protected]

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Coriolis Mass Flow Meter CMM

Type Key Ordering example

CMM

0.15

N

S

F

016

J

N EX protection N no Z with Zener barrier unit

Electrical connection J junction box C compact electronic Pressure rating 016 025 040 063 100 160 250 320 400 Connection type F flanged R NPT E ERMETO

16 25 40 63 100 160 250 320 400

bar bar bar bar bar bar bar bar bar

Material S stainless steel X special Pressure N normal H high Nominal size 0.15 0.3 0.5 1 max. flow rate (t/h) 3 6 14 40 80 Product code

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KRACHT GmbH · Gewerbestr. 20 · 58791 Werdohl, Germany · fon +49 (0) 23 92 / 935-0 · fax +49 (0) 23 92 / 935 209 · web www.kracht.eu · mail [email protected]

Coriolis Mass Flow Meter CMM

Dimensions

CMM – 0.15 … 1 –
N –

CMM –
– N 0.15 … 0.3

X

CMM – 3 … 80 –
N –

Y

Z

P

Q

mm 360

220

23

W threaded

102

196

Max. pressure flanged

bar

NPT

1⁄ 2

DN15

250

1⁄ 2

DN15

250

1

400

280

23

102

196

NPT

3

494

324

23

102

230

NPT 1⁄2

DN15

160

6

560

384

28

128

286

NPT 3⁄4

DN 25

160

14

680

456

32

144

410

NPT 1

DN 25

160

40

820

580

40

175

465

NPT 11⁄2

DN 40

100

80

748

748

100

224

578

–

DN 80

40

Y

Z

P

Q

CMM – 0.15 … 40 –
H –

CMM –
– H

X

mm

W

Max. pressure

ERMETO

flanged

bar

0.15 … 0.3

112

166

128

80

142

M 16 x 1.5

–

400

1

112

204

159

80

178

M 20 x 1.5

–

400

3

122

294

202

98

221

M 20 x 1.5

–

400

6

164

364

241

112

265

M 27 x 2,5

–

400

14

318

530

334

168

426

–

DN 40

250

40

336

560

380

204

476

–

DN 50

160

KRACHT GmbH · Gewerbestr. 20 · 58791 Werdohl, Germany · fon +49 (0) 23 92 / 935-0 · fax +49 (0) 23 92 / 935 209 · web www.kracht.eu · mail [email protected]

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CMM / GB / 06.07

KRACHT GmbH · Gewerbestraße 20 · 58791 Werdohl, Germany · fon +49 (0) 23 92 / 935-0 · fax +49 (0) 23 92 / 935 209 mail [email protected] · web www.kracht.eu