Air Capacity Structure
Material PVC - Gaskets Buna-N
Based on 70°F, 14.7 psia (Base Conditions)
Beta Value Based on Std Sch pipe I.D.
1.25" overall thickness
Orifice plate thickness is 0.125"

POPULAR MODELS

Model Number	Description	Price
OP-A-1	Orifice plate flow meter, 0.5" line size, 0.200" bore, 0.32 Beta, water capacity: 20" d.p. W/C, 0.62 GPM flow; air capacity: 20" d.p. W/C, 2.35 SCFM @ 14.7 psia, 3.63 SCFM @ 20 psig, 6.61 SCFM @ 100 psig; 1 lb.	£ 262.00
OP-A-2	Orifice plate flow meter, 0.5" line size, 0.310" bore, 0.50 Beta, water capacity: 100" d.p. W/C, 3.44 GPM flow; air capacity: 100" d.p. W/C, 12.21 SCFM @ 14.7 psia, 19.58 SCFM @ 20 psig, 36.37 SCFM @ 100 psig; 1 lb.	£ 262.00
OP-A-3	Orifice plate flow meter, 0.5" line size, 0.430" bore, 0.69 Beta, water capacity: 320" d.p. W/C, 13.00 GPM flow; air capacity: 200" d.p. W/C, 32.77 SCFM @ 14.7 psia, 56.15 SCFM @ 20 psig, 107.47 SCFM @ 100 psig; 1 lb.	£ 262.00
OP-B-1	Orifice plate flow meter, 0.75" line size, 0.250" bore, 0.30 Beta, water capacity: 20" d.p. W/C, 0.97 GPM flow; air capacity: 20" d.p. W/C, 3.65 SCFM @ 14.7 psia, 5.66 SCFM @ 20 psig, 10.3 SCFM @ 100 psig; 1 lb.	£ 262.00
OP-B-2	Orifice plate flow meter, 0.75" line size, 0.400" bore, 0.49 Beta, water capacity: 100" d.p. W/C, 5.69 GPM flow; air capacity: 100" d.p. W/C, 20.21 SCFM @ 14.7 psia, 32.44 SCFM @ 20 psig, 60.26 SCFM @ 100 psig; 1 lb.	£ 262.00
OP-B-3	Orifice plate flow meter, 0.75" line size, 0.580" bore, 0.70 Beta, water capacity: 320" d.p. W/C, 23.82 GPM flow; air capacity: 200" d.p. W/C, 59.92 SCFM @ 14.7 psia, 102.91 SCFM @ 20 psig, 197.2 SCFM @ 100 psig; 1 lb.	£ 262.00
OP-C-1	Orifice plate flow meter, 1" line size, 0.300" bore, 0.29 Beta, water capacity: 20" d.p. W/C, 1.38 GPM flow; air capacity: 20" d.p. W/C, 5.24 SCFM @ 14.7 psia, 8.11 SCFM @ 20 psig, 14.8 SCFM @ 100 psig; 2 lb.	£ 262.00
OP-C-2	Orifice plate flow meter, 1" line size, 0.520" bore, 0.49 Beta, water capacity: 100" d.p. W/C, 9.63 GPM flow; air capacity: 100" d.p. W/C, 34.2 SCFM @ 14.7 psia, 54.92 SCFM @ 20 psig, 102.09 SCFM @ 100 psig; 2 lb.	£ 262.00
OP-C-3	Orifice plate flow meter, 1" line size, 0.720" bore, 0.69 Beta, water capacity: 320" d.p. W/C, 36.15 GPM flow; air capacity: 200" d.p. W/C, 91.28 SCFM @ 14.7 psia, 156.51 SCFM @ 20 psig, 300 SCFM @ 100 psig; 2 lb.	£ 262.00
OP-D-1	Orifice plate flow meter, 1.25" line size, 0.400" bore, 0.29 Beta, water capacity: 20" d.p. W/C, 2.46 GPM flow; air capacity: 20" d.p. W/C, 9.31 SCFM @ 14.7 psia, 14.41 SCFM @ 20 psig, 26.3 SCFM @ 100 psig; 2 lb.	£ 262.00
OP-D-2	Orifice plate flow meter, 1.25" line size, 0.700" bore, 0.51 Beta, water capacity: 100" d.p. W/C, 17.48 GPM flow; air capacity: 100" d.p. W/C, 62.09 SCFM @ 14.7 psia, 99.75 SCFM @ 20 psig, 185.5 SCFM @ 100 psig; 2 lb.	£ 262.00
OP-D-3	Orifice plate flow meter, 1.25" line size, 1.00" bore, 0.72 Beta, water capacity: 320" d.p. W/C, 71.77 GPM flow; air capacity: 200" d.p. W/C, 180 SCFM @ 14.7 psia, 309.97 SCFM @ 20 psig, 595.2 SCFM @ 100 psig; 2 lb.	£ 262.00
OP-E-1	Orifice plate flow meter, 1.5" line size, 0.500" bore, 0.31 Beta, water capacity: 20" d.p. W/C, 3.85 GPM flow; air capacity: 20" d.p. W/C, 14.57 SCFM @ 14.7 psia, 22.55 SCFM @ 20 psig, 41.16 SCFM @ 100 psig; 2 lb.	£ 262.00
OP-E-2	Orifice plate flow meter, 1.5" line size, 0.800" bore, 0.50 Beta, water capacity: 100" d.p. W/C, 22.73 GPM flow; air capacity: 100" d.p. W/C, 80.82 SCFM @ 14.7 psia, 129.68 SCFM @ 20 psig, 251.5 SCFM @ 100 psig; 2 lb.	£ 262.00
OP-E-3	Orifice plate flow meter, 1.5" line size, 1.100" bore, 0.68 Beta, water capacity: 320" d.p. W/C, 83.95 GPM flow; air capacity: 200" d.p. W/C, 212.18 SCFM @ 14.7 psia, 363.93 SCFM @ 20 psig, 697.39 SCFM @ 100 psig; 2 lb.	£ 262.00
OP-F-1	Orifice plate flow meter, 2" line size, 0.600" bore, 0.29 Beta, water capacity: 20" d.p. W/C, 5.52 GPM flow; air capacity: 20" d.p. W/C, 20.92 SCFM @ 14.7 psia, 32.38 SCFM @ 20 psig, 59.13 SCFM @ 100 psig; 3 lb.	£ 293.00
OP-F-2	Orifice plate flow meter, 2" line size, 1.000" bore, 0.48 Beta, water capacity: 100" d.p. W/C, 35.34 GPM flow; air capacity: 100" d.p. W/C, 125.74 SCFM @ 14.7 psia, 202.03 SCFM @ 20 psig, 375.8 SCFM @ 100 psig; 3 lb.	£ 293.00
OP-F-3	Orifice plate flow meter, 2" line size, 1.450" bore, 0.70 Beta, water capacity: 320" d.p. W/C, 147.74 GPM flow; air capacity: 200" d.p. W/C, 372.09 SCFM @ 14.7 psia, 639.87 SCFM @ 20 psig, 1227.63 SCFM @ 100 psig; 3 lb.	£ 293.00
OP-G-1	Orifice plate flow meter, 2.5" line size, 0.750" bore, 0.30 Beta, water capacity: 20" d.p. W/C, 8.63 GPM flow; air capacity: 20" d.p. W/C, 32.71 SCFM @ 14.7 psia, 50.64 SCFM @ 20 psig, 92.48 SCFM @ 100 psig; 4 lb.	£ 324.00
OP-G-2	Orifice plate flow meter, 2.5" line size, 1.250" bore, 0.50 Beta, water capacity: 100" d.p. W/C, 55.54 GPM flow; air capacity: 100" d.p. W/C, 197.54 SCFM @ 14.7 psia, 317.58 SCFM @ 20 psig, 590.91 SCFM @ 100 psig; 4 lb.	£ 324.00
OP-G-3	Orifice plate flow meter, 2.5" line size, 1.750" bore, 0.70 Beta, water capacity: 320" d.p. W/C, 216.30 GPM flow; air capacity: 200" d.p. W/C, 543.99 SCFM @ 14.7 psia, 936.56 SCFM @ 20 psig, 1798.86 SCFM @ 100 psig; 4 lb.	£ 324.00
OP-H-1	Orifice plate flow meter, 3" line size, 0.920" bore, 0.30 Beta, water capacity: 20" d.p. W/C, 12.97 GPM flow; air capacity: 20" d.p. W/C, 49.17 SCFM @ 14.7 psia, 78.13 SCFM @ 20 psig, 139.06 SCFM @ 100 psig; 5 lb.	£ 356.00
OP-H-2	Orifice plate flow meter, 3" line size, 1.500" bore, 0.49 Beta, water capacity: 100" d.p. W/C, 79.94 GPM flow; air capacity: 100" d.p. W/C, 282.9 SCFM @ 14.7 psia, 454.77 SCFM @ 20 psig, 846.21 SCFM @ 100 psig; 5 lb.	£ 356.00
OP-H-3	Orifice plate flow meter, 3" line size, 2.150" bore, 0.70 Beta, water capacity: 320" d.p. W/C, 324.16 GPM flow; air capacity: 200" d.p. W/C, 816.7 SCFM @ 14.7 psia, 1404.95 SCFM @ 20 psig, 2696.28 SCFM @ 100 psig; 5 lb.	£ 356.00
OP-J-1	Orifice plate flow meter, 4" line size, 1.200" bore, 0.30 Beta, water capacity: 20" d.p. W/C, 22.03 GPM flow; air capacity: 20" d.p. W/C, 83.58 SCFM @ 14.7 psia, 129.44 SCFM @ 20 psig, 236.48 SCFM @ 100 psig; 7 lb.	£ 481.00
OP-J-2	Orifice plate flow meter, 4" line size, 2.000" bore, 0.50 Beta, water capacity: 100" d.p. W/C, 141.51 GPM flow; air capacity: 100" d.p. W/C, 503.76 SCFM @ 14.7 psia, 810.06 SCFM @ 20 psig, 1507.64 SCFM @ 100 psig; 7 lb.	£ 481.00
OP-J-3	Orifice plate flow meter, 4" line size, 2.800" bore, 0.70 Beta, water capacity: 320" d.p. W/C, 547.11 GPM flow; air capacity: 200" d.p. W/C, 1380.03 SCFM @ 14.7 psia, 2373.02 SCFM @ 20 psig, 4553.68 SCFM @ 100 psig; 7 lb.	£ 481.00
OP-K-1	Orifice plate flow meter, 5" line size, 1.500" bore, 0.30 Beta, water capacity: 20" d.p. W/C, 34.39 GPM flow; air capacity: 20" d.p. W/C, 130.48 SCFM @ 14.7 psia, 202.11 SCFM @ 20 psig, 369.29 SCFM @ 100 psig; 8 lb.	£ 550.00
OP-K-2	Orifice plate flow meter, 5" line size, 2.500" bore, 0.50 Beta, water capacity: 100" d.p. W/C, 220.80 GPM flow; air capacity: 100" d.p. W/C, 786.23 SCFM @ 14.7 psia, 1264.42 SCFM @ 20 psig, 2353.51 SCFM @ 100 psig; 8 lb.	£ 550.00
OP-K-3	Orifice plate flow meter, 5" line size, 3.500" bore, 0.69 Beta, water capacity: 320" d.p. W/C, 853.09 GPM flow; air capacity: 200" d.p. W/C, 2152.83 SCFM @ 14.7 psia, 3701.57 SCFM @ 20 psig, 7103.22 SCFM @ 100 psig; 8 lb.	£ 550.00
OP-L-1	Orifice plate flow meter, 6" line size, 1.800" bore, 0.30 Beta, water capacity: 20" d.p. W/C, 49.46 GPM flow; air capacity: 20" d.p. W/C, 187.86 SCFM @ 14.7 psia, 291 SCFM @ 20 psig, 531.75 SCFM @ 100 psig; 10 lb.	£ 648.00
OP-L-2	Orifice plate flow meter, 6" line size, 3.000" bore, 0.49 Beta, water capacity: 100" d.p. W/C, 317.74 GPM flow; air capacity: 100" d.p. W/C, 1331.63 SCFM @ 14.7 psia, 1820.05 SCFM @ 20 psig, 3387.93 SCFM @ 100 psig; 10 lb.	£ 648.00
OP-L-3	Orifice plate flow meter, 6" line size, 4.200" bore, 0.69 Beta, water capacity: 320" d.p. W/C, 1226.98 GPM flow; air capacity: 200" d.p. W/C, 3097.20 SCFM @ 14.7 psia, 5325.20 SCFM @ 20 psig, 10219.28 SCFM @ 100 psig; 10 lb.	£ 648.00
OP-M-1	Orifice plate flow meter, 8" line size, 2.400" bore, 0.30 Beta, water capacity: 20" d.p. W/C, 87.95 GPM flow; air capacity: 20" d.p. W/C, 333.87 SCFM @ 14.7 psia, 517.25 SCFM @ 20 psig, 945.28 SCFM @ 100 psig; 14 lb.	£ 790.00
OP-M-2	Orifice plate flow meter, 8" line size, 4.000" bore, 0.50 Beta, water capacity: 100" d.p. W/C, 565.77 GPM flow; air capacity: 100" d.p. W/C, 2014.95 SCFM @ 14.7 psia, 3241.45 SCFM @ 20 psig, 6034.85 SCFM @ 100 psig; 14 lb.	£ 790.00
OP-M-3	Orifice plate flow meter, 8" line size, 5.600" bore, 0.70 Beta, water capacity: 320" d.p. W/C, 2195.86 GPM flow; air capacity: 200" d.p. W/C, 5532.00 SCFM @ 14.7 psia, 9525.43 SCFM @ 20 psig, 18290.00 SCFM @ 100 psig; 14 lb.	£ 790.00
OP-N-1	Orifice plate flow meter, 10" line size, 3.000" bore, 0.30 Beta, water capacity: 20" d.p. W/C, 137.35 GPM flow; air capacity: 20" d.p. W/C, 521.58 SCFM @ 14.7 psia, 808 SCFM @ 20 psig, 1476.77 SCFM @ 100 psig; 20 lb.	£ 926.00
OP-N-2	Orifice plate flow meter, 10" line size, 5.000" bore, 0.50 Beta, water capacity: 100" d.p. W/C, 883.04 GPM flow; air capacity: 100" d.p. W/C, 3145.50 SCFM @ 14.7 psia, 5060.38 SCFM @ 20 psig, 9421.74 SCFM @ 100 psig; 20 lb.	£ 926.00
OP-N-3	Orifice plate flow meter, 10" line size, 7.000" bore, 0.70 Beta, water capacity: 320" d.p. W/C, 3421.26 GPM flow; air capacity: 200" d.p. W/C, 8626.42 SCFM @ 14.7 psia, 14846.80 SCFM @ 20 psig, 28506.17 SCFM @ 100 psig; 20 lb.	£ 926.00
OP-O-1	Orifice plate flow meter, 12" line size, 3.600" bore, 0.30 Beta, water capacity: 20" d.p. W/C, 197.73 GPM flow; air capacity: 20" d.p. W/C, 750.9 SCFM @ 14.7 psia, 1163.44 SCFM @ 20 psig, 2126.47 SCFM @ 100 psig; 30 lb.	£ 1359.00
OP-O-2	Orifice plate flow meter, 12" line size, 6.000" bore, 0.50 Beta, water capacity: 100" d.p. W/C, 1271.62 GPM flow; air capacity: 100" d.p. W/C, 4530 SCFM @ 14.7 psia, 7288.16 SCFM @ 20 psig, 13570.33 SCFM @ 100 psig; 30 lb.	£ 1359.00
OP-O-3	Orifice plate flow meter, 12" line size, 8.400" bore, 0.70 Beta, water capacity: 320" d.p. W/C, 4930.86 GPM flow; air capacity: 200" d.p. W/C, 12430.00 SCFM @ 14.7 psia, 21397.00 SCFM @ 20 psig, 41089.02 SCFM @ 100 psig; 30 lb.	£ 1359.00
OP-P-1	Orifice plate flow meter, 14" line size, 4.000" bore, 0.30 Beta, water capacity: 20" d.p. W/C, 244.14 GPM flow; air capacity: 20" d.p. W/C, 927.14 SCFM @ 14.7 psia, 1436.59 SCFM @ 20 psig, 2625.81 SCFM @ 100 psig; 40 lb.	£ 1672.00
OP-P-2	Orifice plate flow meter, 14" line size, 6.600" bore, 0.50 Beta, water capacity: 100" d.p. W/C, 1537.49 GPM flow; air capacity: 100" d.p. W/C, 5477.67 SCFM @ 14.7 psia, 8812.87 SCFM @ 20 psig, 16409.42 SCFM @ 100 psig; 40 lb.	£ 1672.00
OP-P-3	Orifice plate flow meter, 14" line size, 9.300" bore, 0.70 Beta, water capacity: 320" d.p. W/C, 6052.57 GPM flow; air capacity: 200" d.p. W/C, 15251.50 SCFM @ 14.7 psia, 28262.66 SCFM @ 20 psig, 50437.78 SCFM @ 100 psig; 40 lb.	£ 1672.00
OP-Q-1	Orifice plate flow meter, 16" line size, 4.500" bore, 0.30 Beta, water capacity: 20" d.p. W/C, 308.76 GPM flow; air capacity: 20" d.p. W/C, 1172.63 SCFM @ 14.7 psia, 1817.05 SCFM @ 20 psig, 3321.32 SCFM @ 100 psig; 48 lb.	£ 2299.00
OP-Q-2	Orifice plate flow meter, 16" line size, 7.600" bore, 0.50 Beta, water capacity: 100" d.p. W/C, 2038.95 GPM flow; air capacity: 100" d.p. W/C, 7264.58 SCFM @ 14.7 psia, 11688.26 SCFM @ 20 psig, 21764.08 SCFM @ 100 psig; 48 lb.	£ 2299.00
OP-Q-3	Orifice plate flow meter, 16" line size, 10.700" bore, 0.70 Beta, water capacity: 320" d.p. W/C, 8007.74 GPM flow; air capacity: 200" d.p. W/C, 20179.85 SCFM @ 14.7 psia, 34749.32 SCFM @ 20 psig, 66737.64 SCFM @ 100 psig; 48 lb.	£ 2299.00
OP-R-1	Orifice plate flow meter, 18" line size, 5.200" bore, 0.30 Beta, water capacity: 20" d.p. W/C, 412.26 GPM flow; air capacity: 20" d.p. W/C, 1565.79 SCFM @ 14.7 psia, 2426.34 SCFM @ 20 psig, 4435.12 SCFM @ 100 psig; 56 lb.	£ 3135.00
OP-R-2	Orifice plate flow meter, 18" line size, 8.600" bore, 0.50 Beta, water capacity: 100" d.p. W/C, 2610.71 GPM flow; air capacity: 100" d.p. W/C, 9302.08 SCFM @ 14.7 psia, 14966.93 SCFM @ 20 psig, 27869.85 SCFM @ 100 psig; 56 lb.	£ 3135.00
OP-R-3	Orifice plate flow meter, 18" line size, 12..000" bore, 0.70 Beta, water capacity: 320" d.p. W/C, 10027.37 GPM flow; air capacity: 200" d.p. W/C, 25299.92 SCFM @ 14.7 psia, 43535.32 SCFM @ 20 psig, 83587.01 SCFM @ 100 psig; 56 lb.	£ 3135.00
OP-S-1	Orifice plate flow meter, 20" line size, 5.780" bore, 0.30 Beta, water capacity: 20" d.p. W/C, 509.55 GPM flow; air capacity: 20" d.p. W/C, 1935.37 SCFM @ 14.7 psia, 2999.11 SCFM @ 20 psig, 5482.22 SCFM @ 100 psig; 64 lb.	£ 3658.00
OP-S-2	Orifice plate flow meter, 20" line size, 9.600" bore, 0.50 Beta, water capacity: 100" d.p. W/C, 3252.22 GPM flow; air capacity: 100" d.p. W/C, 11588.20 SCFM @ 14.7 psia, 18645.74 SCFM @ 20 psig, 34720.84 SCFM @ 100 psig; 64 lb.	£ 3658.00
OP-S-3	Orifice plate flow meter, 20" line size, 13.5000" bore, 0.70 Beta, water capacity: 320" d.p. W/C, 12742.82 GPM flow; air capacity: 200" d.p. W/C, 32115.34 SCFM @ 14.7 psia, 55303.34 SCFM @ 20 psig, 106215.88 SCFM @ 100 psig; 64 lb.	£ 3658.00
OP-T-1	Orifice plate flow meter, 24" line size, 7.000" bore, 0.30 Beta, water capacity: 20" d.p. W/C, 747.18 GPM flow; air capacity: 20" d.p. W/C, 2838.14 SCFM @ 14.7 psia, 4398.25 SCFM @ 20 psig, 8038.99 SCFM @ 100 psig; 78 lb.	£ 4180.00
OP-T-2	Orifice plate flow meter, 24" line size, 11.700" bore, 0.50 Beta, water capacity: 100" d.p. W/C, 4835.93 GPM flow; air capacity: 100" d.p. W/C, 17229.62 SCFM @ 14.7 psia, 27726.33 SCFM @ 20 psig, 51633.81 SCFM @ 100 psig; 78 lb.	£ 4180.00
OP-T-3	Orifice plate flow meter, 24" line size, 16.3000" bore, 0.70 Beta, water capacity: 320" d.p. W/C, 18572.50 GPM flow; air capacity: 200" d.p. W/C, 46810.53 SCFM @ 14.7 psia, 80610.19 SCFM @ 20 psig, 154823.78 SCFM @ 100 psig; 78 lb.	£ 4180.00

*Prices quoted exclude carriage and VAT which will be added where appropriate in accordance with legislation in force at the date of supply. E&OE. Orders are accepted subject to Dwyer Instruments Ltd Standard Terms and Conditions of Sales and none others whatsoever.

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NOTE: Differential pressure values should be less than 50% of the inlet absolute pressure.