Tokyo Ryuki Kogyo Flo-PL Series Rotameter


It is a high-precision area type flow meter that can directly read the instantaneous flow rate of various types of liquids and gases from the scale on the glass tube indicated by the float.

  • FLO-PL1 type (flow direction special)
  • FLO-PL2 type (flow direction bottom ⇒ top)
  • FLO-PL3 type (flow direction bottom side ⇒ top side)
  • FLO-PL4 type (flow direction back bottom ⇒ back top)
  • Existing (old) Model FLO-PL-18 (with FLO-PL- □ valve)

General Specifications

Measuring fluidLiquid (water, cooling water, transparent liquid)
Gas (air, nitrogen, argon, carbon dioxide, etc.)
Scale range10: 1
Maximum flow rateLiquid 7-70L / min
Gas 90-900NL / min
Body materialBrass (BS), SUS304, SS, etc.
Tapered tube materialHard glass
Float materialLiquid SUS304 SUS316
gaseous aluminum
rubber sealNBR, CR (neoprene), byton
Connection methodRc connection
Connection diameterPlease refer to the measurement range table
Flow accuracyWithin ± 2% FS
Mounting directionVertical direction
Flow directionPlease specify by model code
Maximum working pressure0.7MPa
Maximum operating temperature80 ℃ (depending on the material)
Thermal shock 50 ℃ or less
External dimensionsPlease refer to the measurement range table


Ryuki Kogyo

Tokyo Ryuki Kogyo

Tokyo Ryuki Co., Ltd., a manufacturer of industrial flow meters and fluid-related equipment. For many years, we manufacture and sell products such as differential pressure type flow meter, area type flow meter, flow switch, metal tube type flow meter, galvanometer, level meter, and measuring pot.


Classification NoFlow rate displayFlow rate displayConnection diameterExternal dimensions mm
H2O (L / min)AIR (NL / min)Rc
00.001 to 0.010.01-0.11 / 4B320
10.05-0.50.5-51 / 4B320
20.2-2.05-501 / 4B320
30.5-515-1501 / 4B320
Four1-1020-2001 / 2B320
Five2-2040-4003 / 4B450
  • We will manufacture after confirming the fluid name, density, viscosity, pressure, temperature, flow rate range, connection standard, body material, packing material, etc.
  • For liquid measurement (float: SUS304, etc.)
    * Density = 1.0 g / cm3 and viscosity = 1 cP are standard.
  • For gas measurement (float: aluminum, etc.)
    * The flow rate is displayed by flowing AIR 20 ° C and converting it to the standard state of 0 ° C atm (0.101MPa (A)). (Unit: NL / min)
    * Manufactured in standard condition (atmospheric pressure 20 ° C) upon request. (Unit: SL / min)


  • Liquid
    • Water
    • Cooling water
    • Transparent liquid
  • Gas
    • Air,
    • Nitrogen
    • Argon
    • Carbon dioxide
    • etc


Flow directionfluidClassificationWet contact materialvalvePacking materialAlarm outputFlow rate range / operating temperature / pressure
FLO-PL--□-□-0 □-T-V-P-□
A [AIR]0BSN [None]1 [NBR]0-None
[bottom to top]
W [Wed]1SUS304U [top]2 [CR (neoprene)]1-Yes (conditional)
[Horizontal direction] (Please specify left and right)
Any2SSD [bottom]3 [FKM Byton]
[Bottom back → Top back]

* PL-2 is a valveless type. In  addition, please fill in if the fluid is other than air or water.

Model code entry example
example ①FLO-PL-4-A-05-TBS-VN-P1-0 Flow range 30-300NL / min, temperature 20 ℃, pressure 0.101MPa (A)
Accessories: Unnecessary

Example ②FLO-PL-4 -W-3-TBS-VD-P1-0 Flow range 0.5-5L / min, Temperature 20 ℃, Pressure 0.3MPa (G)

Accessories: Unnecessary Our serial number FM stated on the name plate when making inquiries

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