Ryutai Kogyo ADF, GDF & GDR Water Flowmeters
The Ryutai Kogyo ADF, GDF and GDR Series provide direct visual indication of water flow using the variable area measurement principle. Choose the ADF acrylic tube flowmeter for water lines at normal temperatures, or the GDF glass tube flowmeter for a compact installation with a higher pressure or temperature requirement within its specified limits. The GDR Series provides a compact glass tube option for lower water-flow ranges.
Key Features
- Local flow indication through a transparent tapered measuring tube.
- ADF acrylic tube and GDF/GDR glass tube options.
- Threaded connections for installation in compatible pipework.
- Accuracy within ±5% of full scale and a nominal 10:1 measuring range.
- Vertical installation with flow from bottom to top.
- No electrical power required for the local mechanical indication.
Compare ADF, GDF and GDR
| Specification | ADF Series | GDF Series | GDR Series |
|---|
| Measuring tube |
Transparent acrylic |
Glass |
Glass |
| Standard measuring fluid |
Water |
Water |
Water |
| Threaded connections |
Rc ½, Rc ¾ or Rc 1 |
Rc ½ |
Rc ½ standard; Rc ¼ or Rc ⅜ with connection bushings |
| Accuracy |
±5% of full scale |
±5% of full scale |
±5% of full scale |
| Measuring range ratio |
10:1; 10–100% of the selected full-scale flow |
10:1; 10–100% of the selected full-scale flow |
10:1; 10–100% of the selected full-scale flow |
| Maximum working pressure |
0.3 MPa gauge (3 bar gauge) |
0.5 MPa gauge (5 bar gauge) |
0.5 MPa gauge (5 bar gauge) |
| Operating temperature |
0–40°C |
0–80°C with metal float; 0–50°C with PVC-U float; 0–70°C with PTFE float |
0–80°C with metal float; 0–50°C with PVC-U float; 0–70°C with PTFE float |
| Face-to-face length |
215 or 260 mm, depending on size and configuration |
150 ±3 mm |
150 ±3 mm standard; 172 ±3 mm with connection bushings |
| Construction |
Choice of wetted-material configurations |
Standard SUS304 body; float and gasket materials depend on the selected configuration |
Standard SUS304 body; float and gasket materials depend on the selected configuration |
| Installation |
Vertical, bottom-to-top flow |
Vertical, bottom-to-top flow |
Vertical, bottom-to-top flow |
| Selection reason |
Acrylic tube indication with a choice of threaded pipe sizes |
Compact glass tube design for Rc ½ connections |
Compact glass tube design for lower water-flow ranges |
The complete meter must be suitable for the fluid and operating conditions. For GDF and GDR, apply the lowest temperature limit of its selected components. Other liquids or gases require a separately confirmed special specification.
ADF Acrylic Tube Water Flowmeter
The ADF Series is a practical choice for visual water-flow checks in equipment and process piping operating at 0–40°C. Its acrylic tube allows the float position to be read directly against the calibrated scale. Connection size, scale and wetted materials are selected to suit the installation.
- Rc ½, Rc ¾ and Rc 1 connection options.
- Maximum working pressure of 0.3 MPa gauge.
- Material configurations available for different water-line requirements.
- Scale selection depends on the connection size and meter configuration.
GDF Compact Glass Tube Water Flowmeter
The GDF Series combines a glass measuring tube with a compact body for equipment installation and locations with limited mounting space. Its standard connection is Rc ½, with a face-to-face length of 150 ±3 mm. A flow-control valve is available as an option.
- Glass tube with a standard SUS304 body.
- Maximum working pressure of 0.5 MPa gauge.
- Temperature capability depends on the selected float and other component materials.
- Optional valve arrangement to suit the required installation.
GDF Water Flow Scale Options
Select one calibrated scale for each meter. These are individual measuring ranges, rather than a single adjustable range.
| Series | Connection | Water flow scale |
|---|
| GDF |
Rc ½ |
0.5–5 L/min |
| GDF |
Rc ½ |
1–10 L/min |
| GDF |
Rc ½ |
2–20 L/min |
| GDF |
Rc ½ |
3–30 L/min |
For ADF, provide the required flow range and connection size so Seacom can confirm the appropriate scale and construction.
GDR Compact Glass Tube Flowmeter for Low Water Flow
The GDR Series extends the selection to lower water-flow rates than the GDF scales listed above. It uses a glass tapered tube with a standard SUS304 body and can be supplied with an optional flow-control valve.
The standard connection is Rc ½. Rc ¼ and Rc ⅜ connections use bushings and increase the face-to-face length from 150 to 172 mm, each with a ±3 mm tolerance. Confirm the complete dimensions before replacing an existing meter.
GDR Water Flow Scale Options
| Series | Water flow scale |
|---|
| GDR |
0.05–0.5 L/min |
| GDR |
0.1–1 L/min |
| GDR |
0.15–1.5 L/min |
| GDR |
0.2–2 L/min |
Each range is a separate calibrated scale. Select the scale around the actual minimum, normal and maximum flow required.
Installation and Selection Notes
- Flow range: specify minimum, normal and maximum flow, together with the preferred scale units.
- Pressure and temperature: check continuous operating conditions and pressure surges against the selected meter’s limits.
- Fluid compatibility: identify any additives or cleaning chemicals and confirm compatibility with all wetted materials.
- Mounting: install vertically with flow entering at the bottom. Support the piping to avoid mechanical strain on the meter.
- Replacement dimensions: check the connection thread, face-to-face length and available clearance. ADF, GDF and GDR are separate series and are not automatically interchangeable.
Related Flowmeters
For other tube sizes and configurations, compare the Ryutai Kogyo GTF and ATF tube-type variable area flowmeters. For small-flow purge applications, see the Ryutai Kogyo PGH purge flowmeter.
Need Help Selecting a Water Flowmeter?
Contact Seacom with your fluid, flow range, operating pressure and temperature, pipe size and installation dimensions. For an existing meter, include a photograph of its scale and model marking so we can help check the suitable ADF, GDF or GDR configuration.
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ADF Catalogue
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