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T: 514-354-2511
T: 1 800 463-4363
F: 514-354-6948
Wafer-Style Gas Flowmeter

Wafer-Style Gas Flowmeter

Product Code:RWG & RWBG Series


Need more Info? (514) 354-2511 - 1-800-463-4363

The RWG and RWBG Series meters are wafer-style in-line flow meters designed to offer high accuracy measurements with extremely low pressure drop. The meters have no moving parts and are virtually maintenance-free once installed. The RWG series is suitable for most gas types. The RWBG series is similar in construction but optimized for low-pressure “BioGas” applications, typically CH4 + CO2 mixtures. All meters in these series are loop-powered devices with standard HART® communications for ease of eld programming and system integration.


Operating Principle
An everyday example of a vortex shedding phenomenon is a ag waving in the breeze: the ag waves due to the vortices shed by wind moving across the agpole. Within the flow meter as flowing media moves across the strut or “bluff bar,” vortices are also shed but on a smaller scale. The meter transmits an ultrasonic beam through the vortex pattern downstream of the strut. As vortices are shed the carrier wave of the ultrasonic signal modulates. The modulation of the carrier wave is measurable and proportional to the number of vortices shed. Digital processing enables the vortices to be counted, and this value is converted into a velocity. Software converts velocity into a volumetric flow rate, in units of measure selected by the operator.

Racine Vortex flow meters utilize the smallest strut in the industry, which allows for high levels of sensitivity; superior performance at low flow rates; high turndown ratios; and low pressure drop.

Through the use of an internal RTD and an external pressure sensor (optional), the flow meter software will compensate for changes in pressure and temperature, to achieve an accurate mass flow measurement.

 

Specifications
Measured Gas/Air
Flow Ranges 0.4 to 16 through 20 to 600 acfm
Operating Temperature -20 °F to 360 °F (-28 °C to 182 °C)
Ambient Temperature Limits -20 °F to 155 °F (-28 °C to 68 °C)
Operating Pressure -5 to 250 PSIG (-.34 to 17.2 Barg)
Accuracy ±1% of reading over the upper 90% of the flow range
Repeatability 0.5% of reading
Input Power 24 VDC
Signal Output 2-wire, 4-20 mA loop
Construction Stainless steel wetted parts with ceramic transducers (Teon® in RWBG Series),
Viton® o-rings, NEMA 7 XP enclosure standard
Communications HART® Protocol (via PC with HART Modem)
Certifications CE: EN61326-1:2002
Optional Intrinsically Safe conforms to:
ATEX II 2G Ex ib IIB T4
Zone 1 Group IIB T4 (Canada) and AEx ib IIB T4 (USA)
Options 2 line, 8-digit rate/totalizer display
Integral RTD temperature compensation for
mass flow measurement
Remote mount electronics
Wafer body suitable for DN Flange installation

 

Flow Ranges* (Based on air, 60 °F (16 °C))
Pipe
Size
Flow
Range
PRESSURE PSIG (Barg)
0 (0) 25 (1.7) 50 (3.4) 75 (5.2) 100 (6.9) 150 (10.3) 200 (13.8) 250 (17.2)
Min. Max. Min. Max. Min. Max. Min. Max. Min. Max. Min. Max. Min. Max. Min. Max.
½" SCFM 0.4 16 1 43 2 70 2 81 3 81 4 81 6 81 7 81
Nm3/Hr 1 27 2 73 3 120 4 138 5 138 8 138 10 138 12 138
1" SCFM 1 45 3 122 6 198 8 275 10 351 14 498 18 498 23 498
Nm3/Hr 3 76 6 207 9 337 13 467 17 597 24 846 31 846 38 846
1½" SCFM 3 100 7 270 11 440 15 610 20 780 28 1121 37 1229 45 1229
Nm3/Hr 4 170 11 459 19 748 26 1037 33 1326 48 1904 62 2089 77 2089
2" SCFM 5 200 14 540 22 880 31 1221 39 1561 56 1991 73 1992 90 1992
Nm3/Hr 9 340 23 918 37 1496 52 2074 66 2652 95 3384 124 3384 153 3384
3" SCFM 10 400 27 1080 44 1761 61 2441 78 3122 112 4247 146 4247 180 4247
Nm3/Hr 17 680 46 1836 75 2992 104 4148 133 5305 190 7217 248 7217 306 7217
4" SCFM 20 600 54 1621 88 2641 122 3662 156 4683 224 6724 292 7898 360 7898
Nm3/Hr 34 965 92 2754 150 4488 207 6223 256 7957 381 11426 496 13420 612 13420

 

Pressure Drop - At Full Flow (1 STP)
  Inches H20 kPa
Size Air CH4 Air CH4
0.5 12 7 3 1.7
1.0 5 2.7 1.2 0.7
1.5 2.3 1.3 0.6 0.3
2.0 2.7 1.5 0.7 0.4
3.0 1.3 0.7 0.3 0.2
4.0 0.5 0.3 0.13 0.07

 

Part Number Construction

 

Dimensional Drawings
  Inches (mm)
Model Meter Size Dia. A Dia. B Dim. C Dim. D Bolt Circle
RWG/RWBG05 ½" (13) 2.86 X 2.86 (Square)
(72.6 X 72.6)
0.50 (12.7) 2.4 (61) 2.25 (57.2) 2.38 (60.5)
RWG/RWBG10 1" (25) 3.97 (100.8) 0.875 (22.2) 3.1 (78) 2.25 (57.2) 3.125 (79.4)
RWG/RWBG15 1½" (38) 4.72 (119.9) 1.375 (34.9) 3.9 (99) 2.25 (57.2) 3.875 (98.4)
RWG/RWBG20 2" (51) 4.00 (101.6) 1.75 (44.5) 5.9 (150) 2.25 (57.2)
RWG/RWBG30 3" (76) 5.25 (133.4) 2.75 (69.9) 6.6 (168) 2.25 (57.2)
RWG/RWBG40 4" (102) 6.75 (171.5) 3.75 (95.3) 7.5 (191) 2.25 (57.2)

 

RWG/RWBG05 RWG/RWBG10
RWG/RWBG15
RWG/RWBG20
RWG/RWBG30
RWG/RWBG40

 

Flanged Series Meters* - Inches (mm)
SIZE DIM A DIM B
½" (13) RWG 05-F15
5.60 (142.1)
9.88 - 10.0
(250 - 254)
1" (25) RWG10-F15
5.78 (146.7)
9.88 - 10.0
(250 - 254)
1½" (38) RWG 15-F15
6.34 (160.9)
9.88 - 10.0
(250 - 254)
2" (51) RWG 20-F15
5.92 (150.2)
9.88 - 10.0
(250 - 254)
3" (76) RWG 30-F15
6.62 (168.0)
11.88 - 12.0
(301 - 304)
4" (102) RWG 40-F15
7.52 (190.8)
11.88 - 12.0
(301 - 304)
* 150 lb RF ANSI Flange – standard
300 lb RF ANSI Flange – optional

 

Convertisseur d'unités