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DFS Turbine Flow Meters
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The DigiFlow DFS flowmeters provide low flow sensing capabilities in a wide range of end-user and OEM applications. Utilizing a rotor which, using an infrared beam, generates a digital signal, the DigiFlow concept offers high accuracy, low cost, and a flexible design to meet customer requirements. In either monitoring or flow controlled applications, the DFS series meters can measure flow rates and total quantities. |
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| Design Features |
- Two ranges of 0.07 – 25 litres/minute (.02 – 6.6 GPM)
- Accuracy within +/-0.5% or better.
- Operational pressures up to 70 bar (1,000 PSIG)
- Quantity measurements as small as 0.1 ml.
- Housing of high quality polymers or machined metal.
- Wetted surfaces of high quality polymers.
- Compatible with most acids and bases.
- Low pressure drops
- Friction-free fluid bearings yielding long life.
- Infrared signal pick-up.
- Resolution of up to 65,000 pulses/litre (246,000/gallon).
- Turn down ratios of up to 64:1
- Mount in any position without flow straighteners.
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| Systems & Applications |
The DFS flow meters can monitor flow rates and/or total quantities when connected to a basic counter. In conjunction with a stand-alone controller or interfaced with process control or general purpose computers, the DFS is an integral part of flow controlled processes. In OEM applications or, in end-use, including those requiring disposable components, the DFS is a key part in a systems approach to a wide range of monitoring and controlling applications including:
- Additive injection in chemical processes.
- Medical/Pharmaceutical equipment.
- Dosing of chemicals into main stream flows for agricultural, water treatment, and other requirements.
- Monitoring/Controlling fuel flows.
- Beverage dispensing
- Monitoring pulse feed pump flows.
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| Principle of Operation |
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The fluid flows through the meter, first passing the fixed worm (1) imparting a spiral flow which, in turn, spins the rotor (2) on a virtually friction free bearing. The rotor blades interrupt an infrared beam (3), thus generating a square wave digital output signal.
The rotor is the only moving part. Due to its light weight and the helical pattern of the fluid flow, the rotor has a minimal response time, thus resulting in a very high level of resolution and exceptional accuracy, linearity, and repeatability throughout flow and viscosity ranges.
DFS turbine flowmeters can be mounted in any position and do not require flow straighteners or other specialized installations. Meters are available with hose/barb, threaded and sanitary fittings, as well as with disposable rotor assemblies.
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| SPECIFICATIONS |
DFS-2 |
DFS-3 |
| (Data based on water) |
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| Media |
liquids |
liquids |
| Flow Range - Linear |
0.07 - 4.5 L/m (.02 - 1.2 GPM) |
0.66 - 25 L/m (.17 - 6.6 GPM) |
| Turndown Ratio |
64:1 |
38:1 |
| Accuracy |
+/-0.5% (of actual flow reading) |
+/-0.5% (of actual flow reading) |
| Linearity Deviation |
0.5% |
0.5% |
| Repeatablitiy |
<0.15% |
<0.10% |
| Resolution Pulses (K-factor) |
65,000 pulses/L (246,000 pulses/Gal.) |
4,400/L (16,650 pulses/Gal.) |
| Temperature Range |
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| Operational - Media |
-20 to +85°C (-4 to +185°F) |
-20 to +85°C (-4 to +185°F) |
| Static |
-20 to +130°C (-4 to +266°F) |
-20 to +130°C (-4 to +266°F) |
| Viscosity Range |
0.8 - 10mm2/s (0.8 - 10 cSt) |
0.8 - 15mm2/s (0.8 - 15 cSt) |
| Operational Pressure - Max |
50 bar (710 PSIG)* |
50 bar (710 PSIG) |
| Pressure Drop |
.02 bar @ 1 L/m (2.9 PSI @ .25 GPM) |
.02 bar @ 5 L/m (2.9 PSI @ 1.3 GPM) |
| Power Supply |
5 VDC, 12 - 36 mAmp** |
5 VDC, 12 - 36 mAmp** |
| Output Signal |
Square Wave |
Square Wave |
| Materials - Rotor Assy |
PVDF - Solef® (Polyvinylidene fluoride) |
PVDF - Solef® |
| Materials - Housing |
PVDF - Solef® |
PVDF - Solef® |
| Materials - O-rings |
Fluorine Rubber (Viton®) |
Viton® |
| Electrical Lead |
4 meters (157") in length |
4 meters (157") in length |
| Dimensions - Length |
63.3 mm (2.5") |
74 mm (2.91") |
| Dimensions - Max Diameter |
21.0 mm (0.83") |
44 mm (1.73 ") |
| Connections |
7 mm (9/32") hose barb fitting |
3/8" male NPT or 3/8" male BSP |
| OPTIONS |
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| Materials - Housing |
316L SS, other moldable polymers |
| Materials - O-rings |
EPDM (Ethylene Propylene Rubber), or other |
| Output Signal |
Converter to 4 - 20 mA, 1 - 5V. analog signal available |
| Power Supply |
12 - 24 VDC accommodated externally, or internal modification for OEM orders |
| Electrical Lead |
Other lengths available / or terminal box |
| Connections |
Male 1/4" NPT or 1/4" BSP |
Male 1/4" NPT or 1/4" BSP |
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1/2" Sanitary Tri-clamp |
3/4" Sanitary Tri-clamp |
| *For 1/4" NPT/BSP DFS-2 70 bar (1000 PSIG). |
| **Units set up internally for 5 volts. Other voltages accommodated with external resistor, or internal modivication with volume orders. |
Solef® is a registered tradename of Sovay S.A.
Viton® is a registered tradename of E.I. DuPont, Inc. |
