Ryutai Kogyo ADF and GDF water flowmeters provide direct visual flow indication for equipment and water piping.
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.
| 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.
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.
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.
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.
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.
| 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.
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.
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.
Ryutai Kogyo GTF, ATF, GTV and ATV variable area flowmeters provide direct visual indication of compatible liquid and gas flow.
The Ryutai Kogyo PGF-N purge flowmeter belongs to the discontinued PGF series. Its original specifications remain available here for existing users.
For new requirements or replacement enquiries, see the Ryutai Kogyo PGH Purge Flowmeter.
Contact Seacom to check your flow range, fluid, operating conditions and installation before selecting a replacement.
The TOKICO PFA ultrasonic vortex flowmeter measures compatible chemicals, corrosive liquids and ultrapure water using PFA liquid-contacting construction.
The Badger Meter ModMAG M2000 measures conductive liquid flow, with applications in data centre chilled-water and cooling-water systems. Communication options support integration with building and plant monitoring systems.
The Ryutai Kogyo MCF and E-MCF references relate to earlier metal tube flowmeters and transmitters. This page supports existing instrument identification and replacement enquiries.
For current options, see the Ryutai Kogyo EM Series. Confirm the complete model, flow range, connections and electrical requirements before selecting a replacement.
The Ryutai Kogyo EM Series provides metal tube variable area flow measurement with local indication and optional electrical outputs.
Kofloc RK120XM Flow Meter for Gas Mixing combines two to four variable-area flowmeters into one compact unit for simple multicomponent gas mixing.
Each gas line has an individual inlet, calibrated flow scale and precision needle valve. The individually adjusted gases combine and leave through a common mixed-gas outlet.
The ONICON FT-3000 Series measures electrically conductive liquids in chilled-water, heating-water, condenser-water and other HVAC systems.
Ryutai Kogyo PGH, GPB, GPC and AMF purge and panel flowmeters provide local flow indication for equipment and test systems.
