VARIABLE AREA FLOWMETERS
Series 50HC
High Capacity, Flowmeters
 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.
Specifications
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®
Valve |
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 |
Table II, Tube Selection Table for Series 50HC Flowmeters
Tube
No. |
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. |
| FM4471 |
| FM4472 |
| FM4473 |
| FM4474 |
|
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 |
| 
