VARIABLE AREA FLOWMETERS Series 50 and 50K 65 MM, Direct Reading, Flowmeters
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.
These flowmeters are direct reading for air; however, approximate flow ranges for other gases are listed in the Tube Selection.
Standard Features
Ribbed Tubes stabilize float and improve accuracy and readability.
Borosilicate Glass Tubes allow operating temperatures up to 250°F (100°F for Series 50K).
Threaded Fittings with Locking Nuts (Standard on Series 50) permit front panel mounting.*
Unique Valve Design allows bubble-tight shutoff.
Availability of Aluminum, Stainless Steel or Kynar® Construction provides a wide material selection for maximum gas compatibility.
Optional Features
Baseplate with Leveling Screws permits bench use.
Aluminum Bezel permits flush panel mounting.
Inlet Filter traps foreign matter, extends flowmeter life and reduces maintenance.
* Series 50K Flowmeters may be front panel mounted using predrilled holes on rear of flowmeter and self-tapping screws.
Specifications
Maximum Operating Pressure and Temperature:
50: 200 psig at 250°F
50K: 150 psig at 100°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
centimeters per minute or standard
liters per minute of Air depending
upon range.
Materials
of Construction
Tubes: Borosilicate Glass with float
stops of Teflon®
Floats: Borosilicate Glass, Type 316
Stainless Steel or Carboloy as specified End Blocks Inlet/Outlet Adaptors
Side Plates: Aluminum
Back Plate: White Plastic
Front Plate: Clear Plastic
Seals and Packing: Viton®
(other materials available on
special order)
Valve: Type 316 Stainless Steel
Where "( )" is indicated above, complete the part number by inserting applicable tube number from Tube Selection
Table below. Example: FM4350-5. Order by complete part number.
Tube selection tables for series 50 and 50K Flowmeters
Flow rates shown are at 70°F and 14.7 psia.
Tube No.
Float Material
Air
(Actual Graduations)
Argon*
(Approx. Range)
Carbon Dioxide*
(Approx. Range)
Helium*
(Approx. Range)
0
Glass
8.0–50 sccm
8.0–50 sccm
8.0–50 sccm
4.7–47 sccm
1
Glass
5.0–85 sccm
7.1–71 sccm
10.4–104 sccm
7.9–79 sccm
2
Glass
40–440 sccm
38–375 sccm
36–355 sccm
52–513 sccm
3
316 Stn. Stl.
100–950 sccm
81–808 sccm
77–767 sccm
0.15–1.5 slpm
4
Glass
0.2–1.8 slpm
0.15–1.5 slpm
0.16–1.6 slpm
0.38–3.8 slpm
5
316 Stn. Stl.
0.4–3.6 slpm
0.31–3.1 slpm
0.32–3.2 slpm
0.78–7.8 slpm
6
Glass
0.5–7 slpm
0.6–5.9 slpm
0.6–5.9 slpm
1.55–15.5 slpm
7
316 Stn. Stl.
1.0–13 slpm
1.1–11.1 slpm
1.1–10.9 slpm
3.1–30.6 slpm
8
316 Stn. Stl.
6.0–24 slpm
2.1–20.5 slpm
2.0–20.1 slpm
5.7–56.4 slpm
9
Carboloy
4.0–44 slpm
3.8–37.4 slpm
3.6–36.3 slpm
10.4–103 slpm
Tube No.
Hydrogen*
(Approx. Range)
Nitrogen*
(Approx. Range)
Oxygen*
(Approx. Range)
0
10.5–105 sccm
5.1–51 sccm
4.5–45 sccm
1
17.8–178 sccm
8.7–87 sccm
9.3–93 sccm
2
0.1–1.1 slpm
45–449 sccm
41–411 sccm
3
0.3–2.8 slpm
97–969 sccm
88–884 sccm
4
0.6–6.0 slpm
0.2–1.8 slpm
0.2–1.7 slpm
5
1.2–12.0 slpm
0.4–3.7 slpm
0.3–3.4 slpm
6
2.4–23.8 slpm
0.7–7.1 slpm
0.8–8.2 slpm
7
4.6–45.8 slpm
1.4–13.2 slpm
1.6–15.5 slpm
8
8.5–84.5 slpm
2.5–24.5 slpm
2.9–28.7 slpm
9
15.5–155 slpm
4.5–44.9 slpm
5.3–52.4 slpm
* Series 50 flow tubes are directly calibrated for air at 70°F and 14.7 psia. Flow rates shown for other gases are for reference
purposes only. Flow capacities for gases not listed may be obtained by contacting your Advanced Representative.
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.
These flowmeters are direct reading for air; however, approximate flow ranges for other gases are listed in the 
