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Dwyer PI PISTON | Piston In-Line Variable Area Flowmeter | 1/4 to 1" Pipe, up to 650 cSt
The Dwyer PI PISTON is a mechanical piston variable area flowmeter for in-line use, offered with visual and electronic output choices. The series spans 1/4" to 1" (8 to 25 mm) pipe sizes and handles liquids up to 650 centistokes.
- Accuracy ±2% or ±1% FS, model selectable
- Analog scale and pointer, with optional numeric digital LCD
- Electronic options include 4-20 mA and HART® protocol, plus mechanical switch output
- Installs in-line in any position with no straight pipe run needed
- Process connections: female NPT, SAE, BSPT, BSPP or ANSI RF flanges
- Specifications
- Features
- Downloads
| Part Number | PI PISTON |
| Brand | Dwyer |
| Pipe Size | 1/4" to 1" (8 to 25 mm) |
| Accuracy | ±2% or ±1% FS (model selectable) |
| Repeatability | 1% of reading |
| Viscosity | 650 cSt max |
| Output | 4-20 mA, HART®, switch (model selectable) |
| Display | Analog scale and pointer, optional LCD |
| Process Connection | Female NPT, SAE, BSPT, BSPP or ANSI RF flange |
| Max Pressure | Al/brass 500 psi; 316 SS 1500 psi |
| Max Temperature | 200°F (93°C); HT option 400°F (205°C) |
| Wetted Materials | Aluminium, brass or 316 SS body; 316L SS piston |
| Approvals | CE, ETL |
| Weight | 10 to 20 lb (4.5 to 9.1 kg), model dependent |
- There must be no straight pipe runs before or after the meter.
- Power is not needed for standard mechanical sensor pointers or switches.
- 10:1 rejection rate to increase measurement versatility.
- Rugged, made entirely of metal.
- Mounting in multiple directions.
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