Advanced Specialty Gas Equipment

Series 50HC

High Capacity, Flowmeters

Series 50HC Flowmeter Series 50HC flowmeters offer an economical means of measuring gas or liquid flow at flow rates up to 15 standard cubic feet per minute (scfm) of air. Suitable for both plant and laboratory use, these flowmeters have an accuracy of ±10%. Each flowmeter consists of a replaceable glass metering tube with a Type 316 Stainless Steel float and float stops. Either chrome-plated brass or Type 316 Stainless Steel valves, end blocks and fittings are available. Tubes are calibrated with air and graduated directly in standard cubic feet per minute (scfm) at 70°F and 14.7 psia.

Standard Features
  • Large Diameter Flow Tubes permit flows as high as 15 standard cubic feet per minute (scfm) of air.
  • Ribbed Tubes stabilize float and improve accuracy and readability.
  • Borosilicate Glass Tubes allow operating temperatures up to 200°F.
  • Brass or Stainless Steel Construction permits use in either corrosive or noncorrosive gas service.


Maximum Operating Pressure and
  Temperature: 200 psig at 200°F

Minimum Operating Temperature: 32°F

Accuracy: ± 10% of full scale from 10%
   to 100% of range

Repeatability: Within 0.5% of full scale

Tube Graduations:
  Standard cubic feet per minute of Air  

Scale Length: 75 mm

Inlet and Outlet Connections:
  3/8" NPT female

Approximate Weight: 2.5 lbs

Materials of Construction
Tube: Borosilicate Glass
Float and Float Stops: Type 316 Stainless Steel
End Blocks
Inlet/Outlet Adaptors
Side Plates: Aluminum
Back Plate: White Plastic
Front Plate: Clear Plastic
Seals and Packing: Viton®

Table I, Series 50HC Flowmeter
Part No. Metering Valve, End Blocks and
Inlet/Outlet Adaptor Material
FM4470-( ) Chrome-Plated Brass
FM4480-( ) Type 316 Stainless Steel
Where "( )" is indicated above, complete the part number by inserting applicable tube number from Table II.
Example: FM4470-1 which has a flow range of 0.6 to 3.4 scfm. Order by complete part number.

Table II, Tube Selection Table for Series 50HC Flowmeters

Air Flow Rate Range
at 70°F and 14.7 psia
1 0.6-3.4 scfm
2 0.6-6.0 scfm
3 1.2-12.0 scfm
4 1.5-15.0 scfm
     Replacement Tubes
     Part No.

Table III, Gas Conversion Factors for Series 50HC Flowmeters
To select proper tube for gases other than Air, multiply flow rate values for Air given in Table II (above) by applicable conversion factor shown below. Then use these new flow rate values to select appropriate tube number.

Gas Factor* Gas Factor*
Acetylene 1.04 Helium 2.69
Ammonia 1.30 Hydrogen 3.81
Argon 0.85 Methane 1.35
Butane 0.70 Neon 1.20
Carbon Dioxide 0.81 Nitrogen 1.01
Carbon Monoxide 1.01 Oxygen 0.95
Ethane 0.98 Propane 0.80
Ethylene 1.02 Sulfur Dioxide 0.66
* Conversion factors are approximately equal to square root of the reciprocal of the specific gravity of the gas (?1/SG).
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