Glass Tube Flowmeter R-100 Series

R-100 is a series of Glass tube flowmeters. The flow rate of liquids and gases is indicated by the position of float and graduation on glass tube. No utility supply such as electricity and /or air for operation. The best cost effective flow measurement is possible.

No straight both for upstream and downstream is required for process installation. No utility supply is needed.


The pure mechanical construction offers most cost effective flowmeasurement.


In addition to flow rate measurement, the measurement fluids are directly observed for better process fluid quality control.


Besides the standard metallic material, resins and/or lining materials are available for corrosive fluids.
Measuring fluid All kinds of liquids and gases
(Not suitable for steam measurement)
Flow range Liquids (Water at 20°C )
Max. 5,200 to 52,000L/h
Min. 0.9 to 9L/h

Gases (Air at 0°C , 0MPa)
Max. 100 to 1000m³/h(nor)
Min. 0.015 to 0.15m³/h(nor)
*Depending on the fluid and the float material
Meter size 10A to 100A
Fluid temperature Max. 120°C (Depending on the meter material)
Allowable thermal shock : 80°C
Fuluid Pressure Max. 1.2MPa for 10A
Max. 1.0MPa for 15A
Max. 0.8MPa for 20A, 25A
Max. 0.6MPa for 40A, 50A, 65A
Max. 0.4MPa for 80A, 100A
Rating JIS10K Flange (Option : ANSI, DIN Flange , Rc, NPT Thread)
Body: FC200, SUS304, SUS316, SUS316L
Tapered tube: Heat-resistant glass (Option: Acryl)
Float: (For liquids) SUS304, SUS316, SUS316L, MA
(For gases) Aluminum, PTFE, PVC, SUS304
Seal: NBR, FPM
Indication Accuracy ± 1.5%F.S. (Depending on the meter material and the flow rate)
± 2.5%F.S. (In cae of resin float)
Range ability 10 : 1
Optional products Not straight through design, Ribbed taperd tube,
Flow adjusting valve Special versions
Relevant products Glass tube flowmeter for large flow: R-101-E
Glass tube flowmeter with alarm contact: R-700
Glass tube flowmeter for water flow standard scales: NE
Acryl Tube Flowmeters: AC
All Teflon construction flowmeter: AC-T