Flow Control
Explore our comprehensive range of Flow Control products, featuring precision instruments such as flow meters, flow switches, flow transmitters, and flow sensors. Our offerings cater to diverse applications, ensuri...
Categories in Flow Control Products (6)
Flow Meters
Flow meters are a piece of essential equipment for many industries, as they allow for accurately measuring fluid flow rates. At Centro, we carry a complete online selection of flow meters, including magnetic flow meters, turbine flow meters, and positive displacement flow meters. We also offer a variety of accessories and replacement parts to ensure that your flow meter always operates at peak efficiency. Whether you're looking for a new flow meter or need to restock your supplies, Centro has everything you need to keep your operation running smoothly.
Flow Switches
Flow switches are vital instruments in fluid systems that detect the presence or absence of flow. These devices ensure proper operation and prevent issues such as pump damage or system failure. Flow switches are employed in various industries to monitor and control the flow of liquids or gases, providing a reliable means of safeguarding equipment and optimizing fluid processes.
Flow Transmitters
Flow Transmitters are essential in fluid systems, accurately measuring and transmitting flow rate data. These devices play a critical role in monitoring and controlling the flow of liquids or gases in various applications. By providing real-time information, Flow Transmitters enable precise adjustments, ensuring optimal performance and efficiency. Their reliability and accuracy make them indispensable for industries where precise flow measurement is crucial.
Flow Sensors
Flow Sensors are key elements in fluid systems, detecting and measuring the flow rate. These devices offer real-time data on liquid or gas movement, enabling precise control and monitoring. Flow Sensors are essential in manufacturing, healthcare, and environmental monitoring industries, providing valuable insights for process optimization, quality control, and regulatory compliance.
Flow, pH & Conductivity Meters, Transmitters & Controllers
Centro offers a wide range of flow, pH, and conductivity meters, transmitters, and controllers to meet the demands of various industrial and commercial applications. From monitoring flow rates and maintaining chemical balance for fluid quality and consistency, our solutions are engineered for precision, reliability, and seamless integration. We provide products such as magnetic and ultrasonic flow meters, pH controllers, and conductivity transmitters designed to optimize performance in industries like water treatment, food and beverage, chemical processing, and pharmaceuticals.
Whether you need accurate measurements, durable equipment, or easy system integration, Centro has the expertise and products to support your operations. Explore our selection online or contact our team to find the right solution for your application and ensure peak system efficiency.
Flow Control Accessories
Flow Control Accessories encompass a range of supplementary components designed to optimize, support, or enhance the operation of primary flow control equipment such as valves, regulators, actuators, and pumps. These accessories are critical in ensuring precise control, safety, and efficiency within fluid and gas systems across industrial, commercial, and residential applications.
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The KOBOLD KSK plastic flowmeter and switch delivers reliable flow measurement for liquids and gases in a corrosion-resistant package featuring polyamide or polysulfone construction that stands up to aggressive acids and alkaline solutions typically unsuitable for metal units. Operating on the variable-area principle with a PVDF float traveling within a clear conical measuring tube, this versatile instrument provides ±4% full scale accuracy across a wide measurement range from 0.006 GPM to 4.4 GPM for liquids or from 0.06 SCFM to 62 SCFM for air (with polysulfone models offering specialized calibration scales for pressures from 0 to 145 PSIG). The compact design can be equipped with either bistable reed contacts (N/O or N/C) or NPN transistor switches featuring LED status indication, providing reliable flow monitoring and alarm capabilities for critical process protection applications. With a maximum pressure rating of 145 PSIG and temperature capabilities up to 212°F (for polysulfone versions with brass or stainless steel fittings), these shock-proof instruments offer exceptional chemical compatibility while maintaining visual indication through their clear measuring tubes. Versatile connection options including PVC glue socket/NPT female fittings or brass/stainless steel NPT adapters in various sizes make the KSK series adaptable to numerous industrial applications requiring chemical resistance combined with accurate flow measurement and control.
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The Dwyer - FL-2061 is a Variable Area Flow Meter featuring Air, 1 SCFM to 10 SCFM, 100 psi, 1/4 " NPT Female, ± 3 %, Direct Read, Acrylic, Buna, Brass, and w/Valve. It is rated for a temperature range of 65 °C (150 °F). Part of the FL-2000 Series. Sold individually.
$202.06
Should ship between 09 Dec and 16 Dec
Subject to factory lead times
The Dwyer - FL-3213G is a Variable Area Flow Meter w/60 mm Flow Tube featuring 10.4 SCCM to 104 SCCM Air, 0.175 SCCM to 1.75 SCCM Water, 200 psi, 1/8 " NPT Female, ± 2 %, 0 to 65, w/Valve, and 8 Turn. It is rated for a temperature range of 121 °C. Part of the FL-3200 Series. Sold individually.
$200.92
Should ship between 18 Nov and 25 Nov
Subject to factory lead times
The Dwyer - FL-6305ABR is a Flow Meter featuring Economical, In-line, Water, 0.5 GPM to 5 GPM, 3500 psi, 1/2 " NPT Female, ± 2 %, Direct Read, 302 SS, Brass, Polyphenylene Sulfide, Ceramic, and FKM. It is rated for a temperature range of 116 °C (240 °F). Part of the FL-6000A Series. Sold individually.
$473.65
Should ship between 25 Nov and 09 Dec
Subject to factory lead times
The Dwyer - FMA1845A is a Mass Flow Meter featuring Economical, Gas, 10 SLM to 1000 SLM, 500 psi, 3/4 " NPT Female, 0 Vdc to 5 Vdc, 4 mA to 20 mA, LCD, ± 1 %, Al, Brass, and FKM. It is rated for a temperature range of 50 °C (122 °F). Part of the FMA1800A Series. Sold individually.
$2,217.42
Should ship between 25 Nov and 09 Dec
Subject to factory lead times
The Dwyer - FMA904R-V1 is an Air Velocity Transmitter featuring Hot Wire, 15 Vdc to 24 Vdc, 0 FPM to 5000 FPM, ± 15 FPM Accuracy, 0 Vdc to 5 Vdc, 1/4 " x 12 " (DxL), Remote Probe, and SPST Relay. Part of the FMA904R Series. Sold individually.
$798.10$865.65
Should ship between 02 Dec and 09 Dec
Subject to factory lead times
The Dwyer - FPR304 is a Liquid Flow Meter featuring Low Flow, 6 Vdc to 24 Vdc, 0.5 GPM to 40 GPM, 1 ", NPT Female, ± 1 % Accuracy, Amplified Square Pulse, PP, and 150 psi. Part of the FPR300 Series. Sold individually.
$498.48
Should ship between 18 Nov and 25 Nov
Subject to factory lead times
The Dwyer - FTTP-4SU is an Union featuring Connector, Compression Fitting, Straight, PFA, 1/4 " (OD), and Panel Nut. Part of the FTTP Series. Sold individually.
$133.79
Should ship between 02 Dec and 09 Dec
Subject to factory lead times
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"The MIM Magnetic Flow Meter delivers precision measurement in ultra-low flow applications with features unmatched by conventional devices. Constructed entirely of stainless steel with integrated IO-Link technology, this compact instrument offers bi-directional flow measurement and built-in temperature monitoring capabilities.
Featuring dual configurable outputs (pulse, alarm, or analog), the MIM seamlessly integrates into various process control systems, especially batching operations. The intuitive multi-line LCD display changes color when reaching target flow rates, while optical buttons enable quick dose selection and adjustment. Hot-keys provide instant access to frequently used functions like partial totalizer display and temperature measurement.
The MIM incorporates proprietary U-Pace electronics for reliable performance across diverse applications. For extreme temperature environments, the remote version separates the sensor from electronics via cable, functioning effectively from -40°F to 284°F. Available with NPT-threaded or Tri-Clamp fittings, this versatile Magnetic Flow Meter accommodates various installation requirements."
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The Dwyer - FLR7320D is an Indicating Flow Meter w/Analog Output featuring Water, 2 GPM to 20 GPM, 3500 psi, 3/4 " NPT Female, ± 2 %, Digital, Al, T302 SS, Carbon Steel, Silicone, PPS, Ceramic, and FKM. It is rated for a temperature range of 116 °C (240 °F). Part of the FLR Series. Sold individually.
$1,621.71
Should ship between 11 Nov and 18 Nov
Subject to factory lead times
The Dwyer - FMA1712A is a Mass Flow Meter featuring Economical, Gas, 5 SCCM to 500 SCCM, 1000 psi, 1/4 " Compression, 0 Vdc to 5 Vdc, 4 mA to 20 mA, ± 1 %, Al, Brass, and FKM. It is rated for a temperature range of 50 °C (122 °F). Part of the FMA1700A Series. Sold individually.
$891.60
Should ship between 25 Nov and 09 Dec
Subject to factory lead times
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The KOBOLD MIK Compact Magneto-Inductive Flowmeter delivers precision electromagnetic flow measurement for conductive liquids with exceptional ±2% full scale accuracy across flow ranges from 0.18 GPH to 180 GPM. Operating on Faraday's Law of magnetic induction, this maintenance-free instrument features zero moving parts and robust all-plastic construction with multiple material combinations including PPS and PVDF housings paired with stainless steel, Hastelloy®, or Tantalum electrodes. The versatile design handles aggressive chemicals, acids, caustic solutions, and corrosive media at pressures up to 145 psi and temperatures from -4°F to 176°F, making it ideal for water treatment, chemical processing, pharmaceutical, food and beverage, and other demanding industrial applications where traditional metal flowmeters would deteriorate.
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The Dwyer - FL-2060 is a Variable Area Flow Meter featuring Air, 0.5 SCFM to 5 SCFM, 100 psi, 1/4 " NPT Female, ± 3 %, Direct Read, Acrylic, Buna, Brass, and w/Valve. It is rated for a temperature range of 65 °C (150 °F). Part of the FL-2000 Series. Sold individually.
$202.06
Should ship between 09 Dec and 16 Dec
Subject to factory lead times
The Dwyer - FMA-1611A-V2 is a Mass Flow Meter featuring Gas, 0 SLM to 250 SLM, RS232, 145 psi, 1/2 " NPT Female, Dual 0 Vdc to 5 Vdc, LCD, ± 0.8 %, 300 SS, Silicone, Al, and FKM. It is rated for a temperature range of 50 °C (122 °F). Part of the FMA-1600A Series. Sold individually.
$2,803.65
Should ship between 09 Dec and 16 Dec
Subject to factory lead times
The Dwyer - FTB-4107A-P is a Turbine Flow Meter for Water Totalization featuring Liquid, 0.22 GPM to 20 GPM, 3/4 ", NPT Male, ± 1.5 %, Amplified Square Wave, Brass, SS, PP, EPDM, and Mechanical Counter Display. Part of the FTB-4105A Series. Sold individually.
$389.46
Should ship between 20 Jan and 27 Jan
Subject to factory lead times
The Dwyer - FTB-804-I is a Turbine Flow Meter featuring Liquid, 0.176 GPM to 1.76 GPM (0.6662 LPM to 6.662 LPM), 1/2 ", NPT Male, ± 0.5 %, 4 mA to 20 mA, 304, 316, CD4MCU SS, and Tungsten Carbide. Part of the FTB-800 Series. Sold individually.
$1,255.83
Should ship between 25 Nov and 09 Dec
Subject to factory lead times
The Dwyer - FV103-T is a Vortex Shedding Flow Meter & Temperature Transmitter featuring 2.5 GPM to 25 GPM, 3/4 " NPT Female, ± 2 %, 10 Vdc to 30 Vdc, 4 mA to 20 mA, Brass, PVDF, FKM O-RING, and LCD Display. Part of the FV101 Series. Sold individually.
$1,562.50
Should ship between 06 Jan and 13 Jan
Subject to factory lead times
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The DUK Compact Inline Ultrasonic Flow Meter combines American craftsmanship from Pittsburgh, PA with innovative U-Pace electronics, delivering exceptional performance with short lead times. This versatile instrument features integrated temperature measurement, IO-Link compatibility, bi-directional flow capabilities, and processes moderately viscous media up to 68 cSt.
Ideal for non-conductive liquids where magnetic flow meters aren't suitable, the DUK operates without moving parts, ensuring long service life and minimal maintenance. Its inline design provides superior accuracy through direct liquid contact, particularly at low flow rates and in smaller pipe diameters. With an industry-leading 250:1 turndown ratio, it maintains consistent accuracy across widely fluctuating flow conditions.
The DUK utilizes transit time difference technology with dual-function sensors and features user-friendly elements including two configurable outputs for switching, batching, and transmitting functions. The digital touch screen rotates in 90° increments for optimal viewing in any installation position, while the future-proof design allows for straightforward onsite electronics replacement.
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The Dwyer - FLDA3212ST is a Variable Area Flow Meter featuring Air, 0.2 LPM to 2 LPM, 200 psi, 1/8 " NPT Female, ± 5 %, Direct Read, Aluminum, Glass, Buna, 316 SS, and w/Valve. It is rated for a temperature range of 121 °C (250 °F). Part of the FLD Series. Sold individually.
$209.55
Should ship between 18 Nov and 25 Nov
Subject to factory lead times
The Dwyer - FLK-2214 is a Variable Area Flow Meter featuring Air, 1 LPM to 12 LPM, 125 psi, 1/8 " NPT Female, ± 4 %, Direct Read, Acrylic, Brass, SS, Silicone Rubber, and w/Valve. It is rated for a temperature range of 60 °C (140 °F). Part of the FLK-2000 Series. Sold individually.
$92.65
Should ship between 18 Nov and 25 Nov
Subject to factory lead times
The Dwyer - FMA-1606A is a Mass Flow Meter featuring Gas, 0.025 SLM to 5 SLM, RS232, 145 psi, 1/8 " NPT Female, 0 Vdc to 5 Vdc, LCD, ± 0.8 %, 300 SS, Al, Silicone, FKM, and Supply Incl. It is rated for a temperature range of 50 °C (122 °F). Part of the FMA-1600A Series. Sold individually.
$1,975.56
Should ship between 11 Nov and 18 Nov
Subject to factory lead times
The Dwyer - FMA-A2304 is a Mass Flow Meter featuring Gas, 2 SCCM to 200 SCCM, 250 psi, 1/4 " NPT Female, 0 Vdc to 5 Vdc, 4 mA to 20 mA, LCD, ± 1 %, 17-4 SS, Acetal, and FKM. It is rated for a temperature range of 50 °C (122 °F). Part of the FMA-A2000 Series. Sold individually.
$1,075.29
Should ship between 18 Nov and 25 Nov
Subject to factory lead times
The Dwyer - FMA1806A is a Mass Flow Meter featuring Economical, Gas, 0.5 SCCM to 50 SCCM, 1000 psi, 1/4 " Compression, 0 Vdc to 5 Vdc, 4 mA to 20 mA, LCD, ± 1 %, Al, Brass, and FKM. It is rated for a temperature range of 50 °C (122 °F). Part of the FMA1800A Series. Sold individually.
$996.00
Should ship between 25 Nov and 09 Dec
Subject to factory lead times
The Dwyer - FMA1828A is a Mass Flow Meter featuring Economical, Gas, 0.5 SLM to 50 SLM, 1000 psi, 1/4 " Compression, 0 Vdc to 5 Vdc, 4 mA to 20 mA, LCD, ± 1 %, Al, Brass, and FKM. It is rated for a temperature range of 50 °C (122 °F). Part of the FMA1800A Series. Sold individually.
$1,270.41
Should ship between 25 Nov and 09 Dec
Subject to factory lead times
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The KOBOLD KSK plastic flowmeter and switch delivers reliable flow measurement for liquids and gases in a corrosion-resistant package featuring polyamide or polysulfone construction that stands up to aggressive acids and alkaline solutions typically unsuitable for metal units. Operating on the variable-area principle with a PVDF float traveling within a clear conical measuring tube, this versatile instrument provides ±4% full scale accuracy across a wide measurement range from 0.006 GPM to 4.4 GPM for liquids or from 0.06 SCFM to 62 SCFM for air (with polysulfone models offering specialized calibration scales for pressures from 0 to 145 PSIG). The compact design can be equipped with either bistable reed contacts (N/O or N/C) or NPN transistor switches featuring LED status indication, providing reliable flow monitoring and alarm capabilities for critical process protection applications. With a maximum pressure rating of 145 PSIG and temperature capabilities up to 212°F (for polysulfone versions with brass or stainless steel fittings), these shock-proof instruments offer exceptional chemical compatibility while maintaining visual indication through their clear measuring tubes. Versatile connection options including PVC glue socket/NPT female fittings or brass/stainless steel NPT adapters in various sizes make the KSK series adaptable to numerous industrial applications requiring chemical resistance combined with accurate flow measurement and control.
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The Dwyer - FL-2061 is a Variable Area Flow Meter featuring Air, 1 SCFM to 10 SCFM, 100 psi, 1/4 " NPT Female, ± 3 %, Direct Read, Acrylic, Buna, Brass, and w/Valve. It is rated for a temperature range of 65 °C (150 °F). Part of the FL-2000 Series. Sold individually.
$202.06
Should ship between 09 Dec and 16 Dec
Subject to factory lead times
The Dwyer - FL-3213G is a Variable Area Flow Meter w/60 mm Flow Tube featuring 10.4 SCCM to 104 SCCM Air, 0.175 SCCM to 1.75 SCCM Water, 200 psi, 1/8 " NPT Female, ± 2 %, 0 to 65, w/Valve, and 8 Turn. It is rated for a temperature range of 121 °C. Part of the FL-3200 Series. Sold individually.
$200.92
Should ship between 18 Nov and 25 Nov
Subject to factory lead times
The Dwyer - FL-6305ABR is a Flow Meter featuring Economical, In-line, Water, 0.5 GPM to 5 GPM, 3500 psi, 1/2 " NPT Female, ± 2 %, Direct Read, 302 SS, Brass, Polyphenylene Sulfide, Ceramic, and FKM. It is rated for a temperature range of 116 °C (240 °F). Part of the FL-6000A Series. Sold individually.
$473.65
Should ship between 25 Nov and 09 Dec
Subject to factory lead times
The Dwyer - FMA1845A is a Mass Flow Meter featuring Economical, Gas, 10 SLM to 1000 SLM, 500 psi, 3/4 " NPT Female, 0 Vdc to 5 Vdc, 4 mA to 20 mA, LCD, ± 1 %, Al, Brass, and FKM. It is rated for a temperature range of 50 °C (122 °F). Part of the FMA1800A Series. Sold individually.
$2,217.42
Should ship between 25 Nov and 09 Dec
Subject to factory lead times
The Dwyer - FMA904R-V1 is an Air Velocity Transmitter featuring Hot Wire, 15 Vdc to 24 Vdc, 0 FPM to 5000 FPM, ± 15 FPM Accuracy, 0 Vdc to 5 Vdc, 1/4 " x 12 " (DxL), Remote Probe, and SPST Relay. Part of the FMA904R Series. Sold individually.
$798.10$865.65
Should ship between 02 Dec and 09 Dec
Subject to factory lead times
The Dwyer - FPR304 is a Liquid Flow Meter featuring Low Flow, 6 Vdc to 24 Vdc, 0.5 GPM to 40 GPM, 1 ", NPT Female, ± 1 % Accuracy, Amplified Square Pulse, PP, and 150 psi. Part of the FPR300 Series. Sold individually.
$498.48
Should ship between 18 Nov and 25 Nov
Subject to factory lead times
The Dwyer - FTTP-4SU is an Union featuring Connector, Compression Fitting, Straight, PFA, 1/4 " (OD), and Panel Nut. Part of the FTTP Series. Sold individually.
$133.79
Should ship between 02 Dec and 09 Dec
Subject to factory lead times
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"The MIM Magnetic Flow Meter delivers precision measurement in ultra-low flow applications with features unmatched by conventional devices. Constructed entirely of stainless steel with integrated IO-Link technology, this compact instrument offers bi-directional flow measurement and built-in temperature monitoring capabilities.
Featuring dual configurable outputs (pulse, alarm, or analog), the MIM seamlessly integrates into various process control systems, especially batching operations. The intuitive multi-line LCD display changes color when reaching target flow rates, while optical buttons enable quick dose selection and adjustment. Hot-keys provide instant access to frequently used functions like partial totalizer display and temperature measurement.
The MIM incorporates proprietary U-Pace electronics for reliable performance across diverse applications. For extreme temperature environments, the remote version separates the sensor from electronics via cable, functioning effectively from -40°F to 284°F. Available with NPT-threaded or Tri-Clamp fittings, this versatile Magnetic Flow Meter accommodates various installation requirements."
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The Dwyer - FLR7320D is an Indicating Flow Meter w/Analog Output featuring Water, 2 GPM to 20 GPM, 3500 psi, 3/4 " NPT Female, ± 2 %, Digital, Al, T302 SS, Carbon Steel, Silicone, PPS, Ceramic, and FKM. It is rated for a temperature range of 116 °C (240 °F). Part of the FLR Series. Sold individually.
$1,621.71
Should ship between 11 Nov and 18 Nov
Subject to factory lead times
The Dwyer - FMA1712A is a Mass Flow Meter featuring Economical, Gas, 5 SCCM to 500 SCCM, 1000 psi, 1/4 " Compression, 0 Vdc to 5 Vdc, 4 mA to 20 mA, ± 1 %, Al, Brass, and FKM. It is rated for a temperature range of 50 °C (122 °F). Part of the FMA1700A Series. Sold individually.
$891.60
Should ship between 25 Nov and 09 Dec
Subject to factory lead times
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The KOBOLD MIK Compact Magneto-Inductive Flowmeter delivers precision electromagnetic flow measurement for conductive liquids with exceptional ±2% full scale accuracy across flow ranges from 0.18 GPH to 180 GPM. Operating on Faraday's Law of magnetic induction, this maintenance-free instrument features zero moving parts and robust all-plastic construction with multiple material combinations including PPS and PVDF housings paired with stainless steel, Hastelloy®, or Tantalum electrodes. The versatile design handles aggressive chemicals, acids, caustic solutions, and corrosive media at pressures up to 145 psi and temperatures from -4°F to 176°F, making it ideal for water treatment, chemical processing, pharmaceutical, food and beverage, and other demanding industrial applications where traditional metal flowmeters would deteriorate.
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The Dwyer - FL-2060 is a Variable Area Flow Meter featuring Air, 0.5 SCFM to 5 SCFM, 100 psi, 1/4 " NPT Female, ± 3 %, Direct Read, Acrylic, Buna, Brass, and w/Valve. It is rated for a temperature range of 65 °C (150 °F). Part of the FL-2000 Series. Sold individually.
$202.06
Should ship between 09 Dec and 16 Dec
Subject to factory lead times
The Dwyer - FMA-1611A-V2 is a Mass Flow Meter featuring Gas, 0 SLM to 250 SLM, RS232, 145 psi, 1/2 " NPT Female, Dual 0 Vdc to 5 Vdc, LCD, ± 0.8 %, 300 SS, Silicone, Al, and FKM. It is rated for a temperature range of 50 °C (122 °F). Part of the FMA-1600A Series. Sold individually.
$2,803.65
Should ship between 09 Dec and 16 Dec
Subject to factory lead times
The Dwyer - FTB-4107A-P is a Turbine Flow Meter for Water Totalization featuring Liquid, 0.22 GPM to 20 GPM, 3/4 ", NPT Male, ± 1.5 %, Amplified Square Wave, Brass, SS, PP, EPDM, and Mechanical Counter Display. Part of the FTB-4105A Series. Sold individually.
$389.46
Should ship between 20 Jan and 27 Jan
Subject to factory lead times
The Dwyer - FTB-804-I is a Turbine Flow Meter featuring Liquid, 0.176 GPM to 1.76 GPM (0.6662 LPM to 6.662 LPM), 1/2 ", NPT Male, ± 0.5 %, 4 mA to 20 mA, 304, 316, CD4MCU SS, and Tungsten Carbide. Part of the FTB-800 Series. Sold individually.
$1,255.83
Should ship between 25 Nov and 09 Dec
Subject to factory lead times
The Dwyer - FV103-T is a Vortex Shedding Flow Meter & Temperature Transmitter featuring 2.5 GPM to 25 GPM, 3/4 " NPT Female, ± 2 %, 10 Vdc to 30 Vdc, 4 mA to 20 mA, Brass, PVDF, FKM O-RING, and LCD Display. Part of the FV101 Series. Sold individually.
$1,562.50
Should ship between 06 Jan and 13 Jan
Subject to factory lead times
Configure product to see pricing
The DUK Compact Inline Ultrasonic Flow Meter combines American craftsmanship from Pittsburgh, PA with innovative U-Pace electronics, delivering exceptional performance with short lead times. This versatile instrument features integrated temperature measurement, IO-Link compatibility, bi-directional flow capabilities, and processes moderately viscous media up to 68 cSt.
Ideal for non-conductive liquids where magnetic flow meters aren't suitable, the DUK operates without moving parts, ensuring long service life and minimal maintenance. Its inline design provides superior accuracy through direct liquid contact, particularly at low flow rates and in smaller pipe diameters. With an industry-leading 250:1 turndown ratio, it maintains consistent accuracy across widely fluctuating flow conditions.
The DUK utilizes transit time difference technology with dual-function sensors and features user-friendly elements including two configurable outputs for switching, batching, and transmitting functions. The digital touch screen rotates in 90° increments for optimal viewing in any installation position, while the future-proof design allows for straightforward onsite electronics replacement.
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The Dwyer - FLDA3212ST is a Variable Area Flow Meter featuring Air, 0.2 LPM to 2 LPM, 200 psi, 1/8 " NPT Female, ± 5 %, Direct Read, Aluminum, Glass, Buna, 316 SS, and w/Valve. It is rated for a temperature range of 121 °C (250 °F). Part of the FLD Series. Sold individually.
$209.55
Should ship between 18 Nov and 25 Nov
Subject to factory lead times
The Dwyer - FLK-2214 is a Variable Area Flow Meter featuring Air, 1 LPM to 12 LPM, 125 psi, 1/8 " NPT Female, ± 4 %, Direct Read, Acrylic, Brass, SS, Silicone Rubber, and w/Valve. It is rated for a temperature range of 60 °C (140 °F). Part of the FLK-2000 Series. Sold individually.
$92.65
Should ship between 18 Nov and 25 Nov
Subject to factory lead times
The Dwyer - FMA-1606A is a Mass Flow Meter featuring Gas, 0.025 SLM to 5 SLM, RS232, 145 psi, 1/8 " NPT Female, 0 Vdc to 5 Vdc, LCD, ± 0.8 %, 300 SS, Al, Silicone, FKM, and Supply Incl. It is rated for a temperature range of 50 °C (122 °F). Part of the FMA-1600A Series. Sold individually.
$1,975.56
Should ship between 11 Nov and 18 Nov
Subject to factory lead times
The Dwyer - FMA-A2304 is a Mass Flow Meter featuring Gas, 2 SCCM to 200 SCCM, 250 psi, 1/4 " NPT Female, 0 Vdc to 5 Vdc, 4 mA to 20 mA, LCD, ± 1 %, 17-4 SS, Acetal, and FKM. It is rated for a temperature range of 50 °C (122 °F). Part of the FMA-A2000 Series. Sold individually.
$1,075.29
Should ship between 18 Nov and 25 Nov
Subject to factory lead times
The Dwyer - FMA1806A is a Mass Flow Meter featuring Economical, Gas, 0.5 SCCM to 50 SCCM, 1000 psi, 1/4 " Compression, 0 Vdc to 5 Vdc, 4 mA to 20 mA, LCD, ± 1 %, Al, Brass, and FKM. It is rated for a temperature range of 50 °C (122 °F). Part of the FMA1800A Series. Sold individually.
$996.00
Should ship between 25 Nov and 09 Dec
Subject to factory lead times
The Dwyer - FMA1828A is a Mass Flow Meter featuring Economical, Gas, 0.5 SLM to 50 SLM, 1000 psi, 1/4 " Compression, 0 Vdc to 5 Vdc, 4 mA to 20 mA, LCD, ± 1 %, Al, Brass, and FKM. It is rated for a temperature range of 50 °C (122 °F). Part of the FMA1800A Series. Sold individually.
$1,270.41
Should ship between 25 Nov and 09 Dec
Subject to factory lead times
FAQS
- Measuring flow rate in a pipe requires a flow meter matched to the fluid type, pipe size, flow range, and accuracy requirement. For conductive liquids (water, chemicals, slurries), magnetic flow meters are the most popular choice — they have no moving parts, create no pressure drop, and handle dirty or abrasive fluids. For non-conductive liquids or retrofit installations where you can't cut the pipe, clamp-on ultrasonic flow meters mount externally and measure through the pipe wall. For applications requiring the highest accuracy or mass flow measurement (batching, custody transfer), Coriolis meters measure mass flow directly. For steam and gas, vortex meters are robust and widely used. For simple, low-cost local visual indication of flow rate, variable-area meters (rotameters) provide a direct reading without power or electronics. Flow switches are used when you only need to confirm flow is present or absent — for example, verifying cooling water is running before allowing a machine to start. The flow meter output (typically 4–20 mA) feeds back to a PLC or controller for monitoring, totalization, or closed-loop flow control.
- The flow meter technology must match the fluid type, pipe size, accuracy requirement, and process conditions. Magnetic (mag) flow meters measure conductive liquids (water, chemicals, slurries) using Faraday's law — they have no moving parts, handle dirty or abrasive fluids well, and are the default for water and wastewater applications. Ultrasonic flow meters (transit-time and Doppler) are non-intrusive and can be clamp-on, ideal for retrofit or applications where the pipe cannot be cut. Coriolis meters measure mass flow directly with very high accuracy — the premium choice for custody transfer, batching, and applications requiring density measurement. Vortex meters are robust and versatile for steam, gas, and liquid measurement in moderate-to-large pipe sizes. Variable-area meters (rotameters) provide simple, low-cost local visual indication of flow rate. Turbine meters offer high accuracy for clean, low-viscosity liquids. The best approach is to define the fluid properties, flow range, accuracy requirement, and installation constraints, then match to the technology that fits.
- A flow switch detects whether flow is present or absent (or above/below a threshold) and outputs a discrete on/off signal — it does not measure the actual flow rate. Flow switches are used for protection and alarm functions: confirming cooling water is flowing before allowing a machine to operate, detecting loss of lubrication flow to trigger a shutdown, or verifying that a pump is actually moving fluid. They are simpler and less expensive than flow meters. A flow meter, by contrast, measures the actual flow rate (GPM, liters/minute, SCFM, etc.) and provides a continuous analog or digital output proportional to the flow value. Flow meters are used when the control system needs to know how much fluid is flowing — for batching, dosing, energy accounting, and closed-loop flow control. If you only need to know whether flow is on or off, a flow switch is sufficient. If you need to know how much, you need a flow meter.
- A magnetic flow meter (mag meter) uses Faraday's law of electromagnetic induction to measure the velocity of a conductive liquid flowing through a pipe. The meter generates a magnetic field across the pipe, and the flowing conductive liquid produces a voltage proportional to its velocity — this voltage is measured by electrodes in the pipe wall and converted to a flow rate. Mag meters have several significant advantages: no moving parts (zero maintenance on the sensor itself), no obstruction to flow (full bore, no pressure drop), excellent performance with dirty, abrasive, and slurry-containing liquids, wide turndown ratios (typically 100:1 or greater), and bidirectional measurement capability. They are the standard choice for water and wastewater treatment, chemical processing, food and beverage, pharmaceutical, and pulp and paper applications. The main limitation is that the liquid must be electrically conductive (minimum ~5 µS/cm) — mag meters cannot measure hydrocarbons, deionized water, or gases.
- Flow meter sizing must balance accuracy, rangeability, and pressure drop. The meter should be sized so that the normal operating flow rate falls within the meter's optimal accuracy range — typically between 25% and 75% of its full-scale capacity. Sizing based solely on the pipe diameter is a common mistake — if the pipe is oversized for the actual flow rate (which is common in many installations), the flow velocity through the meter will be too low for accurate measurement. In these cases, the meter should be sized smaller than the pipe, with reducers and expanders installed to transition from the pipe size to the meter size. Key data needed for sizing includes the fluid type and properties (density, viscosity, conductivity, temperature, pressure), the minimum, normal, and maximum flow rates, the required accuracy, and the acceptable pressure drop. Most flow meter manufacturers provide online sizing tools where you input these parameters and receive a recommended meter size and model.