Page 312 - Praxair - Specialty Gases and Equipment Reference Guide

Flow Devices

Variable Area Flowmeters

65 MM, Variable Area Flowmeters (Series 65)
Series 50 flowmeters offer an economical means of measuring gas or liquid flow
at low pressures where ± 10% accuracy is acceptable. They are suitable for plant
and general laboratory applications. Approximate flow ranges for air and several
other gases are listed in the Tube Selection table below.

Standard Features Optional Features
n Interchangeability of control n Ten-to-one (10:1) rangeability. n High resolution control valve for
valve and metering tube assem- n Metering tubes sealed by precise flow control.
blies without disconnecting compression. n Baseplate with leveling screws
from the process piping. permits bench use.
n Rib-guided metering tube for n Metering tube assemblies
contain float stops to prevent
maximum float stability and float loss during tube assembly
accuracy. removal.
n Ceramic scales, with contrasting 65 MM Variable
background for easy viewing, Area Flowmeter
fired on metering tube.

Specifications Materials
n Scale n Performance n Metering Tube n Structural Members
Length: 65 mm Accuracy: ± 10% full scale. Borosilicate glass Side Plates: Black anodized
Type: Fused on metering tube Accuracy specified for 100% to aluminum
n Floats
with contrasting yellow 10% of scale reading (10 to 1 Glass or 316 stainless steel End Fittings: Black anodized
background rangeability). aluminum or 316 stainless steel
Graduations: 0-65 mm with Repeatability: ± 0.5% of full n Float Stops Metering Valve: Black anodized
calibration data scale reading Teflon aluminum (standard cartridge
n Shields valve only), brass/nickel-plated
n Capacities n Connections
Refer to Tube Selection Table 1/8" female NPT threaded Window: Clear polycarbonate brass (high resolution control
adapters with locknuts for Back: Opaque white valve only) or 316 stainless steel Section E – Gas Handling Equipment
n Maximum Operating polycarbonate
®
Pressure and Temperature front panel mounting Viton –
n Tube Packing and O-rings
Ratings n Approximate Weight ® DuPont Dow Elastomers L.L.C.
200 psig at temperatures 0.75 lb Viton (optional materials
up to 200 °F available)
Tube Selection Table for Series 50 Flowmeters – Flow ranges shown are at 70° F and 14.7 PSIA
Tube Float Air Argon Carbon Helium Hydrogen Nitrogen Oxygen
Number Material Dioxide
0 Glass 4.5-45 sccm 3.2-32 sccm 4.5-45 sccm 4.5-45 sccm 10-100 sccm 4.4-44 sccm 4.0-40 sccm
1 Glass 7.8-78 sccm 6.6-66 sccm 9.5-95 sccm 7.0-70 sccm 16-160 sccm 7.5-75 sccm 6.0-60 sccm
2 Glass 44.5-445 sccm 32.6-326 sccm 39-390 sccm 50-500 sccm 0.1-1.0 slpm 45-450 sccm 40-400 sccm
3 316 SS 94.8-948 sccm 68.2-682 sccm 76.4-764 sccm 98.1-981 sccm 0.19-1.93 slpm 83.9-839 sccm 76.6-766 sccm
4 Glass 0.22-2.19 slpm 0.16-1.6 slpm 0.18-1.76 slpm 0.27-2.70 slpm 0.66-6.60 slpm 0.22-2.23 slpm 0.19-1.90 slpm
5 316 SS 0.44-4.40 slpm 0.34-3.39 slpm 0.35-3.46 slpm 0.75-7.50 slpm 1.3-12.8 slpm 0.45-4.50 slpm 0.43-4.25 slpm
6 316 SS 0.85-8.49 slpm 0.65-6.50 slpm 0.72-7.23 slpm 1.7-17.3 slpm 2.6-25.8 slpm 0.84-8.40 slpm 0.80-8.00 slpm
7 316 SS 1.2-11.9 slpm 0.96-9.60 slpm 0.94-9.35 slpm 2.5-24.8 slpm 3.7-37.3 slpm 1.1-11.0 slpm 1.0-10.0 slpm
8 316 SS 2.0-20.0 slpm 1.6-15.7 slpm 1.6-15.6 slpm 4.3-43.1 slpm 6.5-64.9 slpm 2.0-20.0 slpm 1.7-17.1 slpm
9 316 SS 4.3-43.4 slpm 3.2-31.7 slpm 3.1-31.3 slpm 9.5-95.3 slpm 14-137 slpm 4.4-44.0 slpm 4.2-42.0 slpm
Flow capacities for gases not listed may be obtained by contacting your local representative.

Ordering Information
Equipment Additional Equipment
Series Part Number End Blocks Inlet/Outlet Item Part Number
Material Adaptor Material Baseplate PRSFM4702
65 PRSFM4350-( ) Aluminum Aluminum
65 PRSFM4360-( ) 316 Stainless Steel (SS) 316 SS
Where “( )” is indicated above, complete the part number by inserting
applicable tube number from the Tube Selection Table above.
Example: PRSFM4350-3

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