InFLOW, INC.

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Reliable equipment for standard and special applications characterize InFLOW, INC. We are interested in providing long term solutions that offer the customer maximum uptime. We manufacture our flow related devices and systems using proven technologies. Our line of head class meters rely on ASME, ANSI, and other standards to guarantee performance. Our QueTran Disk Flow Meter is designed using the best of existing and new technology.

µFLOW Meter | Series/LFE Flow Meter | QueTran Disk Flow Meter | Primary Elements | Acoustic Flow Switch

Technical Note on Differential Pressure Flow Devices

µFLOW Meter   The µFLOW Meter works on the differential pressure drop principal as discussed by Bernoulli. A contoured nozzle following ASME, ANSI, and other standards is used to create a flow rate that is proportional to the square root of the pressure drop. Monitoring the drop is a SMART (microprocessor based) differential pressure transmitter. Output from the transmitter is an analog current that can be directly proportional to flow (square root function) or differential pressure.

The meter can handle liquids or gases from low to high pressures (>500 psiG or 35 Bar) as well as near cryogenic to high temperatures (>250 F or 120 C). µFLOW nozzles are custom sized for the application from approximately 0.025 to 0.300"Ø (0.6mm to 7.5mm). Nozzles are field removable for cleaning or re-sizing. This results in a highly capable flow meter for low (cc/min) to moderate (GPM or L/min) flows.

By combining this "no moving parts" meter with auxiliary electronics, extremely high flow rate accuracies can be acheived. In addition, by adding pressure and/or temperature compensation, the meter can be used for mass flow applications. With such measures the µFLOW meter can provide stable trouble free operation at accuracies to 0.5% of READING over moderate turndowns.

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Series/LFE Flow Meter   The SERIES/LFE Flow Meter works on the differential pressure drop principal as discussed by Poiseuille's Law. A single or multi-slotted element restricts flow to such a point that laminar flow is acheived. At flow rates in this region, flow rate is linear with differential pressure. Monitoring the drop is a SMART (microprocessor based) differential pressure transmitter. Output from the transmitter is an analog current that is directly proportional to the flow rate.

Based on the same construction as the µFLOW meter, the SERIES/LFE Flow Meter has similar pressure and temperature limits. The element is custom sized for the application and can be field removed for cleaning or re-sizing. Due to the small slot size and laminar flow region operation, flow rates can be extremely low such as <10 cc/min.

By combining this "no moving parts" meter with auxiliary electronics, extremely high flow rate accuracies can be acheived. In addition, by adding pressure and/or temperature compensation, the meter can be used for mass flow applications. With such measures the SERIES/LFE meter can provide stable trouble free operation at accuracies to 0.5% of READING over high turndowns (to 100:1).

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QueTran LDF Liquid Disk Flow Meter   The QueTran Disk Flow Meter operates by transferring fluid kinetic energy to a rotating disk through fluidic friction. While in some models the disk is notched; no blades are used, consequently a number of advantages are realized. In lower flow inline models, fluid enters the meter through a converging nozzle. The fluid then takes a circular course between the disk and housing transferring the maximum energy to the disk. In higher flow models, fluid simply imparts velocity across a tangential area. All models are available with a variety of electronic options to optimize the application.
     
QueTran GDF Gas Disk Flow Meter   Three series are offered; the LDF for water and industrial liquids, the GDF for gases and steam services, and the IDF a hot tappable insertion model for gases and liquids. Inline LDF models can handle flow down to 125 cc/min (2 GPH) and up to 50 GPM (190 L/min), optional higher flow sizes are available.

The Inline GDF model is available for line sizes to 2" and may be fitted with integral pressure and temperature sensors for mass flow outputs. A temperature compensated saturated steam model is offered for small line distribution services.

The IDF model is an insertion style unit for lines sizes 2" and larger. A natural gas model is offered with onboard pressure compensation for mass flow output. A steam model is available with an integral pressure or temperature sensor for mass flow output.

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ASME Flow Nozzles   InFLOW, INC. offers a wide variety of sizes and styles of primary elements. Elements are offered as individual items for customer implementation, or as complete measurement systems including flow straighteners, required piping, and complementary instrumentaton. Typically manufactured from 300 series stainless steel, they can also be purchased in other machinable materials.

Flow nozzles are available in ASME low & high beta ratio configurations, with and without throat taps from throat sizes of 0.025"Ø (0.6mmØ) to large industrial sizes. Both elliptical and circular arc inlet geometries are offered.

Venturi elements are available from small (0.25"Ø - 6.3mmØ) machined sizes to large fabricated units (24"Ø - 60cmØ and larger). A variety of materials, end fittings, and configurations are offered.

Orifice plates and elements are offered from micro sizes (<0.005"Ø - 0.1mmØ) to large industrial sizes.

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Acoustic Flow Switch   InFLOW, INC. offers for OEM applications a unique non-invasive flow switch. The switch is simply attached to the outside of the system pipe. By monitoring the acoustic energy, as liquid flow increases or decreases past an adjustable setpoint, the switch sets the state of a TTL output. An optional LED shows switch state.

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InFLOW, INC. 2001 / All Rights reserved