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Sensors • Flow Sensors

Used to sense the rate or velocity of fluid flow (gas, steam , liquid or solid) within a flow meter or flow logger, a flow sensor  works via direct measurement or inferential measurement.Types of flow sensors include paddlewheel flow sensors and metalex sensors for extreme pressures and temperatures. Inline rotor type sensors are used for clean process liquids; while PVC, PP, or PVDF vortex flow sensors are used for chemical delivery and deionized water distribution.Ultrasonic flow sensors often measure entire flow streams in harsh wastewater and industrial water applications. Low and medium pressure flow sensors are available with basic, amplified, digital output, and millivolt output configurations. Other flow sensor types include: fixed or adjustable set point flow sensors, and turbine flow sensors.Flow sensors are related to velocimeters, a type of sensor that measures the speed of fluids flowing through them.

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  • Cole-Parmer

    Cole-Parmer carries a variety of paddle wheel and impeller flow sensing products. The first option is the Rotor-X paddle flow sensor, which has an open-core design to ensure accurate, linear output to +/-1% and eliminates cavitation at velocities from 1 to 20 ft/second. The Metalex paddle sensor, due to its stainless steel body, can withstand high pressures up to 1,500 psi. Finally, the Rotor-X, a low-flow paddle-wheel sensor, is designed to measure rates as low as 0.3 ft/sec in almost any pipe size. These sensors resist most chemicals. Each sensor listed above offers a full scale repeatability +/-5%.

  • Georg Fischer Piping Systems

    Georg Fischer Piping Systems carries an array of flow sensors in different configurations. Paddlewheel flow sensors come in several models, like the 515 Rotor-X that has a dynamic flow range of 0.3 to 0.6 m/s, 2536 Rotor-X that has a range from 0.1 to 6 m/s, and 525 Metalex sesnsor for extreme pressures and temperatures. Turbine flow sensors are also available for accurate readings in two flow ranges: 0.3 to 3.8 lpm and 3 to 38 lpm. These units have injection-molded PVDF bodies and ceramic bearings, making them chemical-compatible. Other flow sensors include in-line rotor types for clean process liquids; PVC, PP, or PVDF vortex flow sensors for chemical delivery and deionized water distribution; and ultrasonic units that measure entire flow streams in wastewater and industrial water applications.

  • All Sensors Corp.

    All Sensors Corp. carries low and medium pressure flow sensors in basic, amplified, digital output, and millivolt output configurations. The basic low pressure sensors come in the LLC SMT package, which uses a silicon micromachined pressure sensor requiring a supply voltage of 5 V, for use in -25 to 85 degree Celsius temperatures; and also in the mini package for low pressure or low voltage environments. The Amplified line of low pressure sensors comes in 0.25" to 0.5", for use with non-corrosive fluids. Additionally, medium pressure millivolt output sensors come in both A and mini packages, while the 5", 100 psi digital output units come in standard and military specification models.

  • Thomas Products, Ltd., Flow Switch Div.

    The Flow Switch Division of Thomas Products offers both fixed and adjustable set point flow sensors. The 1100 Series fixed set point unit is housed in bronze or stainless steel, with NPT sizes from 0.75" to 3", operating pressures up to 400 psi, and proof loads up to 800 psi. Other fixed set point series include the 1300, for coolant systems and HVAC, 1600, for machine tooling and lubrication systems, and polysulfone 2100 and 2200. Adjustable set point sensors include the 1200 Series, in three sizes for flow settings from 0.75 to 15 GPM; 1400 Series, for 0.75" NPT up to 14 GPM; 1500 Series, 0.5" NPT in brass or stainless steel, for proof loads up to 2,500 psi; and 2400 and 2500 Series paddle type flow switches in brass, stainless steel, or plastic.

  • Gems Sensors & Controls

    Gems Sensors & Controls offers the new RF-2500 Series. With flow ranges from 0.1 to 60 GPM, they offer bright, visual indication with choice of pulsed DC output or adjustable 1 amp switched output. Two basic styles are available. The first style includes different paddle wheel sensors to meet different needs; for example, the RFA provides accurate flow rate indication with visual confirmation, while the RFI does much the same, but with a removable lens for quick cleanout. Second, turbine-style TurboFlow sensors come in three varieties: the economical FT-110 with accuracy +/-3% of reading, low flow rate FT-210, and NSF-approved FT-330, which also provides +/-2% accuracy of reading and +/-0.5% repeatability.

  • Harwil

    Harwil's Q-Series provides a variety of fluid flow switches. Materials include red brass, Hastelloy, 316 stainless steel, Noryl, and Fortron. These sensors are available in pipe sizes of 0.75" and greater, with electrical ratings from 15 amp 125/250 VAC, and temperature/pressure ratings up to 250 degrees Fahrenheit/300 psi. Products start with the Q-1, for flows from 0.12 to 8 GPM, up to the Q5SS, for flows from 10 to 102,000+ GPM.

  • Degree Controls Inc.

    Degree Controls provides an array of airflow sensors for both embedded and development applications in industries such as telecommunication, medical products, electronics, HVAC, and cleanrooms. These sensors can measure air velocities as low as 30 fpm to as high as 4,000 fpm. Development use products include the ATM2400, which can evaluate multi-point air velocity and temperature; the BladeProfile, for accurate readings of flow distribution and pressure drop for ATCA blades and boards; the MicroFlow, which measures system CFM air flow through laptop or handheld devices. Sensors include the F333, for measuring airflow from 0.2 to 10 m/s; F600 board-mounted sensor, to help anticipate thermal rise; and F900, which measures both velocity and temperature in airflows.

  • AVTECH Software Inc

    AVTECH's air flow sensor provides real-time recognition of air flow stoppage, usually in an HVAC duct, under a raised floor, or near a fan on a rack cabinet or important server. The sensor is plug-and-play, and comes with 25' standard cable length that can be extended to 900'.

  • Clark Solutions

    Clark Solutions manufactures several kinds of flow sensors from turbine impeller, to electromagnetic, to vortex. The first group includes the DV01 inductive flow sensor for viscous liquids from 20 to 4,000 cSt. Moreover, the PFA Teflon andturbine stainless steel sensor models have flow sensing ranges of 2, 20, and 40 lpm; and the PFAD and PVDF disposable turbine turbine flow sensors have ranges of 2 and 20 lpm. The one electromagnetic option is the DM01D compact, magnetic, inductive flow sensor, with range from 100 mL/min to 200 l/min, while the vortex option is the DN Series, which has rugged molded PPA construction for 0.25" to 1" pipe sizes.

  • Futurlec

    Three types of flow sensors are carried by Futurlec. The Flow08L0 is a 0.8 to 8 l/min sensor for use in water conservation systems, storage tanks, water recycling home applications, and irrigation systems where water does not exceed 40 degrees Fahrenheit. Its fitting is for a 0.25" pipe. The Flow14L1 senses flow rates from 1.5 to 14.1 l/min for many of the same applications listed above, but for a larger, 0.375" pipe. Lastly, the Flow25L0 is meant for flow rates from 1.5 to 25 l/min, 0.5" pipes, and temperatures up to 80 degrees Celsius.

  • McMillan Flow Products

    McMillan Flow Products offers nearly 20 models of flow sensors for three types of applications. Products for UHP liquid applications include U-shaped flow path sensors such as Models U701 (pulse output) and U702 (analog output), as well as straight flow path and compact models. Sensors for non-UHP liquid applications are made from materials like plastic, brass, and stainless steel, and some are specially designed with integrated flare fittings and PTFE construction (Models 106F and 106S), or for corrosive applications (Model 106). The company also stocks sensors for gas applications, such as the Model 100 gas microturbine flow sensor for steady-flow applications and Model 209 gas thermal flow sensor for high flow rates.

  • Omron Electronic Components

    Omron Corporation specializes in mass flow sensors with a variety of flow ranges, connections, and output signals. The sensors, which are designed either for air or LNG, are capable of flow ranges from 0 to 1 l/min on the low end, to 0 to 10 m/sec on the high end, with bamboo connect, Rc1/4 screws, or Φ5. Output signals are usually analog 1-5V DC, but also come in 0.5-2.5V DC. In total, 17 different models are offered.

  • Optical Scientific, Inc.

    Optical Scientific offers three types of optical flow sensors. The OFS provides path-averaged air velocity measurements in industrial settings, such as smokestacks, ducts, vents, or other confined spaces. Resolution of the velocity measurement is 0.1 m/s, and overall range is 0.1 to 40 m/s. The OFS-F is designed specifically for flare stacks and is based on EPA Method 14-approved technology, but with mostly the same specifications as the standard OFS. Finally, the LOA-105 is a long-baseline optical anemometer that features an electro-optical design to provide a sensor that is immune from external influence. Intended for interior applications like aluminum smelting, the LOA-105 has HF-resistant windows, purge fittings, and a Serial RS-232 interface.

  • Sensirion Inc.

    Sensirion's liquid flow sensors use CMOSens Technology to measure liquid flow in milliliters, microliters, or even nanoliters per minute, even through the wall of a flow channel. In particular, the LG16 and LG216 OEM liquid flow sensor series are designed for flow rates from 5 mL/min or 20 mL/min down to the microfluidic sector, with resolutions into the sub-nanoliter range. They also offer 40 ms response times, making them ideal for medical applications, point-of-care diagnostics devices, vaporizers, environmental testing units, and fuel cell systems.

  • Electrochem

    Electrochem specializes in patented wireless sensors that use the latest ZigBee wireless protocol, for low power consumption, interoperability, and security, powered by lithium cells. Their FlowSensorOne Wireless Flow Sensor (FS1), in particular, can be implemented into any piping systems where rate of flow or total flow must be monitored; applications include oil and gas operations and material processing. Measuring 250 mm long, the sensor provides flow ranges from up to 3 GPM for the 0.375" bore size, to 5,000 GPM for the 10" bore size. Its measurement signals are then amplified and digitized into 24-bit words and converted to units of measure at a rate up to 480 readings per second.

  • Innovative Sensor Technology

    Thermal mass sensors by Innovative Sensor Technology utilize heat transfer principles to determine the flow velocity of a fluid. These sensors are applicable in both gas and partially in liquid, are able to detect the presence of a liquid, biofilm, or bubbles, and can indicate liquid level.  Gas flow products include more sensitive units such as the MicroflowSens and MFS02, both featuring 0.0001 m/s sensitivity and <10 ms response time, to products with broader measuring ranges, such as the FS2 and FS5 that measure up to 50 m/s and 100 m/s, respectively. There are also four liquid flow models, each offering a measuring range from 0 to 10 m/s, sensitivity of 0.01 m/s, and response time <100 ms.

  • Gill Sensors

    Gill Sensors produces ultrasonic flow sensors that are suitable for harsh environments, which take measurements in both directions and use difference in the time of flight to calculate flow velocity. Available products include the mass airflow sensor, which is capable of measuring bi-directional flow up to 600 kg/hr with a resolution of 0.001 kg/hr and turn-down ratio >1,000:1; and also a medical gas flow sensor for anesthesia and ventilation monitoring, which provides a flow range from 0.2 to 150 l/min, accuracy +/-3%, and resolution of 0.01 l/min.

  • Malema Sensors

    Malema Sensors offers flow sensors and switches for industrial and high purity applications. Paddle flow switches, like the MFS-25, are ideal for applications where direction of flow and desired actuation set points are needed for control and dynamics of operation. Their actuation flow rates, on average, are 1.4 m3/hr for lower sizes, and 25 to 30 m3/hr for higher sizes. Both adjustable and fixed set point flow switches are also available, such as the adjustable M-100, with a 1 to 950 mLPM water calibration range, and explosion-proof, adjustable M-100X, to fixed options like the M-50 and M-55, with their broad air and water calibration ranges.

  • Greyline Instruments, Inc.

    Greyline Instruments offers ultrasonic flow meters and switches with clamp-on sensors to measure flow from outside pipes. The PDFM 5.0, for example, is a doppler flow meter with an attached ultrasonic flow sensor, while the Portaflow PT400 and PT500 are transit time flow meters for clean fluids that come with flow sensors to continuously display flow rate and total flow.

  • Icenta

    Icenta is a UK-based supplier of flow meters, level sensors and control instrumentation used in a variety of process industry and manufacturing applications. Products include a variety of flow meters and sensors for monitoring fuel oil consumption, small quantity sensing, low flow rate sensors and more.