SILVER AUTOMATION INSTRUMENTS LTD.

Thermal Mass Flow Meter Model Selection Guideline

The flow range applies to Silver Automation Instruments SRK-100 series thermal mass flow meters.

1. Thermal massFlow range and Flow meter size selection

1.  Flow range Table Reference

Table 1: Air mass flow meter flow range selection table

Table 2:Air, N2 (nitrogen) ,O2 (oxygen gas),H2 (hydrogen) Flow Meter Flow range table

Table 3: Argon (Ar)gas, Helium(He)gas, Natural Gas Methane ,LPG, City Gas, Chlorine Gas flow measurement flow range table

All thermal dispersion mass flow meters are calibrated before leaving factory, the upper limit of flow range will be indicated on the name plate of flow meter.

2. Lower and upper limit of the flow range

1) Lower limit: the thermal mass flow meter is sensitive to low flow, it can detect 0.05 m/s flow rate, so in normal condition, lower limit can be ignored.

2) Upper limit: It is normally decided by process design; the flow meter upper limit is more than 20% of design limit.

3) Mixed gas measurement: For mixed gas, the ender user should provide standard density and mole ratio (different gas percentage of the mix gas). The measuring range is decided by our factory. It is normally calibrated by air or nitrogen flow, and then corrected by meter conversion coefficient.

3. Statement

The flow range is limited by equipment; please get confirmation from factory before purchasing.


Air mass flow rangeselection table

DN (mm)

Min (kg/h)

Normal(kg/h)

Max(kg/h)

25

0-1.14

0-78

0-204

40

0-2.92

0-194

0-525

50

0-4.57

0-310

0-822

80

0-11.7

0-775

0-2106

100

0-18.3

0-1292

0-3291

150

0-41.1

0-2584

0-7404

200

0-73.1

0-5168

0-13613

250

0-114

0-7752

0-20564

300

0-165

0-11162

0-29613

400

0-292

0-19845

0-52645

500

0-457

0-31008

0-82257

600

0-658

0-44652

0-118450

700

0-896

0-60775

0-161224

800

0-1170

0-79380

0-210578

900

0-1481

0-100465

0-266513

1000

0-1828

0-124032

0-329028

1200

0-2632

0-178606

0-473801

1500

0-4113

0-279072

0-740314

2000

0-7312

0-496128

0-1316113


Four kinds common gas calibrated range selection table

DN(mm)

Air

(N2)

(O2)

(H2)

25

60

60

60

28

40

150

150

150

70

50

240

240

240

112

80

600

600

600

282

100

1000

1000

1000

470

150

2000

2000

2000

940

200

4000

4000

4000

1880

250

6000

6000

6000

2820

300

8640

8640

8640

4060

400

15360

15360

15360

7219

500

24000

24000

24000

11280

600

34560

34560

34560

16243

700

47040

47040

47040

22108

800

61440

61440

61440

28876

900

77760

77760

77760

77807

1000

96000

96000

96000

45120

1200

138240

138240

138240

64972

1500

216000

216000

216000

101520

2000

384000

384000

384000

180480

Note: The flow unit in above table is Nm3/h, corresponding flow rate is 34m/s,when in application, it can expand to 50m/s


Common gas upperlimit (Nm3/h)

DN

(mm)

Argon

(Ar)

Helium

(He)

Natural

Gas

Methane

Gas

LPG

City

Gas

Chlorine

Gas

25

82

37

58

51

84

44

109

40

207

94

147

129

211

111

273

50

331

151

235

206

339

177

436

80

828

378

588

516

847

444

1092

100

1380

630

980

860

1143

740

1820

150

2760

1260

1960

1720

2826

1480

3640

200

5520

2520

3920

3440

5652

2960

7280

250

8280

3780

5880

5160

8478

4440

10920

300

11923

5443

8467

7430

12208

6393

15724

400

21196

9676

15052

13209

21703

11366

27955

500

33120

15120

23520

20640

33912

17760

43680

600

47692

21772

33868

29721

48833

25574

62899

700

64915

29635

46099

40454

66467

34809

85612

800

84787

38707

60211

52838

86814

45465

111820

900

107308

48988

76204

66873

109874

57542

141523

1000

132480

60480

94080

82560

135648

71040

174720

1200

190771

87091

135475

118886

195333

102297

251596

1500

298080

136080

211680

185760

305208

159840

393120

2000

529920

241920

376320

330240

542592

284160

698880

Standard state: temperature 0 ℃, Pressure 1.01325×105Pa (absolute pressure)

Flow unit option: kg/h,t/h,Nm3/h,Nkm3/h.

2. Installation types

1. Recommendation:

When the pipeline≤Ø100, Flange thermal mass flow meter  is recommended.

When the pipeline >Ø100,Insertion thermal mass flow meter is recommended.

2. If the field pipes have been installed, no installation flanges available, Insertion type can be selected. Please specify when ordering.

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