Improved Accuracy Specifications on Alicat Mass Flow Meters & Controllers

 by Bill Nick

Alicat’s latest product release (2019) introduces an unprecedented new level of flow accuracy for mass flow meters and controllers. Through improved temperature and pressure compensation our flow measurements are even more resistant to the effects of changing temperature and pressure, and a fully redesigned circuit board has increased our signal to noise ratio and enabled higher resolution for raw sensor data sampling. These augmentations have transformed the already-outstanding Alicat mass flow instruments into one of the most accurate differential pressure-based flow measurement systems on the market.

Alicat devices are now more accurate & maintain accuracy to a significantly lower level than ever before

Alicat mass flow instruments’ have been dropped to ±0.6% of reading or ±0.1% of full scale, whichever is greater (with the high accuracy calibration specification dropping to ±0.5% of reading or ±0.1% of full scale)

Over our old flow accuracy specifications of ±(0.8% of reading + 0.2% of full scale) for standard calibration and ±(0.8% of reading + 0.2% of full scale) for high accuracy calibration.

Increased turndown ratio and resolution specifications from 200:1 and 4 total digits to 10,000:1 and 5 total digits and compensation refinements have increased the flow resolution specifications by a factor of ten.

Replace multiple ranged thermal MFC’s with a SINGLE Alicat

Our usable range is significantly higher than competitors;  You may be able to use one MFC in your system where two were needed because of the flow range limitations of your current MFCs. For example, if you need to control the flow of O2 between 100 SLPM and 100 SCCM, one Alicat MFC can provide accurate, repeatable control over the entire range.  Most thermal based MFCs would require you to have two or more MFCs to complete this same task. This ability leads to:

  • Lower overall build cost
  • Lower cost of operation
  • Less money tied up in inventory for spares/back up units
  • Eliminate gas dependent equipment: Select 98+ preset gases with no recal. Less spares required.
  • Less complicated setup
  • Easy drop-in replacement

Improved Accuracy Means Process Improvements:

  • More accurate gas mixing resulting in less wasted gas
  • More accurate measurements for R&D leading to better decisions when scaling to production
  • Even higher accuracy to perform calibrations of other instruments to a higher standard
  • Improved resolution means finer control:  sensitive applications like bioreactors, pharma, laser, etc can rely on the finer control of an Alicat.

Improved Resolution Means Finer Control:

  • Sensitive process applications like bioreactors, pharma, laser, etc can rely on the finer control of an Alicat Instrument

Example Calculations

To calculate Alicat’s accuracy using the new specification, you’ll need to know the full scale of a flow instrument and its reading.

Let’s assume an M-series Mass Flow Meter with a standard calibration has a full scale of 10 SLPM and it is reading 5 SLPM of flow. For standard calibrations, 16.7% of the full scale is the point at which the error transitions between being greater when calculated with the full scale component of accuracy and greater when calculated with the reading component of accuracy. Since the flow reading is above 16.7% of the full scale, the accuracy calculation is based on the flow reading:

Accuracy = ±0.6% of Reading = (0.006)(5 SLPM) = ±0.03 SLPM

If the flow reading on the mass flow meter is below 16.7% of full scale, e.g. 0.5 SLPM, then the accuracy calculation would look like this:

Accuracy = ±0.1% of Full Scale = (0.001)(10 SLPM) = ±0.01 SLPM

For high accuracy calibrations, the error dominance transitions between reading and full scale at 20% of full scale. With the same full scale and readings as the previous example, the calculations would be as follows:

Accuracy = ±0.5% of Reading = (0.005)(5 SLPM) = ±0.025 SLPM
Accuracy = ±0.1% of Full Scale = (0.001)(10 SLPM) = ±0.01 SLPM

Helpful Terms

 Full Scale:  The maximum calibrated reading of the device.  For bidirectional devices, see the associated specification sheet for an explanation of the full scale.

Resolution: Granularity of variables that are read/controlled

% of Reading:  Portion of the accuracy that depends on the reading.  This is independent of the full scale.  Multiply the stated % of Reading by the actual Reading to get the accuracy at a specific Reading.

% of Full Scale:  Portion of the accuracy that depends on the full scale.  This is independent of the reading.  Multiply the stated % of Full Scale by the calibrated Full Scale of the device to get the accuracy of a specific device.  Note that bidirectional devices might have a different Full Scale.  Please see the individual specification sheets for more information.

D&D Engineering – “W’ere YOUR Sensor Guys”
3835 E. Thousand Oaks Blvd. Suite 464 Westlake Village, CA 91362  – Voice: (818) 772-8720 Fax: (818) 772-2477 Toll Free: (888) 333-6474
Email: sales@sensorguys.com Website: www.sensorguys.com

Proof of Stability



On behalf of a design-in for a client our CTO Dr. G. Wang performed a long stability test on our SMT172-TO18.
The test runned over a year and for six sensors the drift
over a year is better than 2mK. 
We are proud to show this proof of excellent stability. 

D&D Engineering – “W’ere YOUR Sensor Guys”
3835 E. Thousand Oaks Blvd. Suite 464 Westlake Village, CA 91362  – Voice: (818) 772-8720 Fax: (818) 772-2477 Toll Free: (888) 333-6474
Email: sales@sensorguys.com Website: www.sensorguys.com

ISPE Pharma 4.0 conference

The ISPE Pharma 4.0 conference is coming to Manchester, UK from November 18-21 at the legendary Old Trafford Football Stadium.  Alicat will be exhibiting our line of smart bioreactor mass flow controllers at ISPE Pharma 4.0 in Booth #4.

Our recently announced Bio line of mass flow controllers has features designed specifically for bioprocessing and Pharma 4.0. Features for bioreactors include:

  • Water resistant, reliable solid state design
  • Unmatched 10,000:1 controllable range
  • Accuracy better than .1% of full scale
  • USP VI Elastomers and BPE compliant materials
  • High speed industrial protocols enabling Pharma 4.0

This will be the first time that Alicat has exhibited at this conference; we’re happy to join the ISPE community. Our representative for the United Kingdom, Premier Controls Technologies, will be in attendance displaying their full range of flow control products for Pharma. Visit us at Booth # 4 to learn more and see what the fastest flow controller company in the world can do for you.ISPE Pharma 4.0Premier Control Technologies

D&D Engineering – “W’ere YOUR Sensor Guys”
3835 E. Thousand Oaks Blvd. Suite 464 Westlake Village, CA 91362  – Voice: (818) 772-8720 Fax: (818) 772-2477 Toll Free: (888) 333-6474
Email: sales@sensorguys.com Website: www.sensorguys.com

EXPLOSION PROOF CERTIFIED INCLINOMETERS

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TILTIX Inclinometers for Hazardous Locations

POSITAL has extended its TILTIX family of inclinometers (tilt sensors) to include explosion-proof models designed to operate safely in environments that contain potentially dangerous levels of explosive dust or gases. These devices have been certified in compliance with IECEx and ATEX directives and are suitable for use in mines, oil and gas facilities, agricultural applications, chemical plants, woodworking factories and milling operations.

  • ATEX and IECEx Certified
  • Zone 1/21 Mining or Oil and Gas
  • High Vibration and Shock Resistance 
  • ±80° (Dual Axis) or 360° (Single Axis)
  • CANopen, DeviceNet, Analog, SSI
  • Rugged Aluminum and 316 Stainless Steel Housings
  • Usage in Gas (2G) and Dust (1D) Hazardous Locations 
  • Accuracy up to +/- 0.1°

Large Variety

Like other TILTIX inclinometers, the new models are available in single (0-360°) or dual-axis (± 80°) versions and feature resolution as high as 0.01° and 0.1° accuracy. Available communications interfaces include DeviceNet, CANopen, Modbus RTU, SSI and analog output. Analog models can be programmed so that a predetermined range of mechanical motion is set span the full electrical output range. Rugged aluminum and 316 stainless steel housings are offered, with other materials available by special order. 

These products have been certified to the following ATEX ratings:

Group I (mining) :

  • Ex I M2 Ex e mb I Mb

Group II (above ground operations) :

  • EX II 2G Ex e mb IIc TX Gb (explosive gases)
  • EX II 1D Ex ta IIIC TX Da IP65 (flammable dust)

A Million Possibilities

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POSITAL also offers Encoders and Accessories for Hazardous Locations:

ATEX and IECEx Norms

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ATEX and IECEx norms define essential requirements for equipment and protective systems intended for use in potentially explosive atmospheres.

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Applications and Industries


Mining

Agriculture

Drilling

Oil and Gas

D&D Engineering – “W’ere YOUR Sensor Guys”
3835 E. Thousand Oaks Blvd. Suite 464 Westlake Village, CA 91362  – Voice: (818) 772-8720 Fax: (818) 772-2477 Toll Free: (888) 333-6474
Email: sales@sensorguys.com Website: www.sensorguys.com

Alicat releases new flow calibrator for air quality samplers

 by Shaina Shay

Satisfy air quality monitoring standards and ensure good data with ease and accuracy using the FP-25 flow calibration kit.

Alicat FP-25 Calibrator

Tucson, September 26, 2019 – Today Alicat’s Environmental Monitoring division released their new and improved FP-25 flow calibration kit.  This calibration kit includes everything needed for auditing, calibrating, and leak checking air quality sampling instruments.

What’s included:

  • Portable FP-25 flow calibrator – with rechargeable battery
  • External temperature probe
  • Bluetooth antenna
  • Micro-USB to USB cable and adapter for charging and communications
  • 1/4″ NPT barb adapter (1/4″ barb) with face seal
  • 1/4″ NPT fittings with face seals for pass-through connection to 1-1/4″ OD air sampler downtubes
  • NIST-traceable calibration certificate
  • Operating Manual
  • Custom-fit hard case

The FP-25 flow calibrator uses advanced laminar flow technology that provides accurate measurements at a wider range of flow rates and temperatures when compared to DryCal technology.

“Alicat recognizes that new and emerging air quality challenges require improved technologies. That is why we are proud to introduce our upgraded FP-25 flow calibrator. It’s time to update your tech and expect more of your calibrator.”

Designed for the field.

The FP-25 is durable, reliable, and accurate. With an IP67 rating this device can be used in any weather and any temperature, from -30C to +60C. This FP-25 uses drop resistant laminar flow technology which means no glass, no pistons, and no problems.

This is the first calibrator with Bluetooth capabilities. Alicat has designed a tailored app that is available for IOS or Android devices. The Alicat Connect app now features a data logging function so you can capture your flow data in real time.

Technicians can now complete audits remotely, reducing the time needed for air quality sampler calibration. Improve work safety by reducing the number of trips up and down ladders.

“The FP-25 calibrator is everything you need to comply with government regulations and ensure good data in one, easy to use device.”

D&D Engineering – “W’ere YOUR Sensor Guys”
3835 E. Thousand Oaks Blvd. Suite 464 Westlake Village, CA 91362  – Voice: (818) 772-8720 Fax: (818) 772-2477 Toll Free: (888) 333-6474
Email: sales@sensorguys.com Website: www.sensorguys.com

Correcting for temperature and pressure effects on sensors

 by Alicat Scientific

Alicat recently rolled out a major update to the main circuit board and sensors on our mass flow devices. Improvements in our sensors and advanced our understanding of flow physics have brought about changes in our circuitry to ensure you’re getting the maximum performance out of every part of your Alicat mass flow device.

The high resolution information we get from our new circuit board gives us a better picture of what’s happening in the flow path of our devices than ever before. One thing this lets us see very clearly is how tiny changes in operating conditions alter the behavior of our sensors. Compensating for these changes lets us build devices which give more repeatable measurements and are less prone to drift.

Separating the signal from the sensor

A perfect sensor would map to external physical properties 1:1 with its output signal under any conditions.  But sensors and circuits are made of matter and their behavior changes as their physical state changes. Alicat sensors are no exception, as our electronics warm up and our sensors are compressed by process gas the signal we are interested in changes.

Alicat compensates for this variation in sensor behavior using the one of the strengths of our measurement technique: multiple independent sensors. In each of our flow instruments a differential pressure sensor provides our main tool to measure flow while absolute pressure and temperature sensors allow us to correct this volumetric flow rate to a mass flow rate. Read more on our theory of operation of laminar differential pressure flow measurement. As long we characterize the response of each sensor to pressure and temperature shifts beforehand we can use software to correct sensor output based on operating conditions.

From straight lines to curves

The previous generation of Alicat instruments used a linear compensation technique for temperature and pressure. Each device had its sensor offset measured at ambient and high temperature/pressure. We interpolated these two points to make a straight calibration line. In our new release, we’ve improved our modeling to more effectively model the physical systems we’re dealing with to create a non-linear interpolation of sensor state changes.

On a new Alicat device each sensor and circuit board combination is characterized in an environmental chamber at the full range of the device’s expected operating temperatures and pressures. This produces smooth compensation curves which better account for real sensor behavior.  The improvement is profound and especially noticeable at low temperature:

Shift in absolute pressure reading with varying temperature. Current generation in blue and previous generation in red.

By pairing better hardware with this software compensation the newest generation of Alicat devices is more capable than ever before. We’re now running into the limits of flow physics instead of sensor noise. Ongoing research into gas behavior and improvements to our flow channel will help us unlock the full potential of our devices moving forward.

D&D Engineering – “W’ere YOUR Sensor Guys”
3835 E. Thousand Oaks Blvd. Suite 464 Westlake Village, CA 91362  – Voice: (818) 772-8720 Fax: (818) 772-2477 Toll Free: (888) 333-6474
Email: sales@sensorguys.com Website: www.sensorguys.com

NEW HOLLOW SHAFT MULTI-TURN KIT ENCODERS FOR POSITION CONTROL APPLICATIONS

NEW HOLLOW SHAFT MULTI-TURN KIT ENCODERS
FOR POSITION CONTROL APPLICATIONS

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Slim Form Factor for Motor and Machine Manufacturers

POSITAL is introducing a new family of absolute rotary encoders for servomotors, stepper motors, robot joints and anywhere else a hollow center design is needed to achieve an optimal mechanical layout. Both single and multi-turn variants are available; for multi-turn models, the rotation counter is self-powered, using POSITAL’s Wiegand energy-harvesting technology. This eliminates the need for backup batteries and lowers maintenance costs.

  • Hollow Center Design for Optimal Mechanical Layout on Robotic Joints and Drives Shafts
  • 30 mm or 50 mm Internal Diameter Sizes Available
  • Battery-less Rotation Counter Based on Energy-Harvesting Technology
  • Capacitive Measurement System Allows for High Accuracy Even in Harsh Environments
  • Non-Proprietary Interfaces of SSI and BiSS C Standards

Capacitive Measurement Technology

These new products make use of a capacitive measurement system. Each encoder has two principle components, a stator and rotor, both containing specially shaped conductive surfaces. These surfaces, which function as capacitor plates, are positioned in close proximity. As the rotor turns, the patterns of the conductive surfaces change their relative position, causing changes to capacitive coupling in the system. This in turn causes changes to the amplitude and phase angle of a high-frequency electrical signal generated by exciter circuits in the stator. Special ASIC devices capture and decode these signal variations to determine the rotor’s angular position to a high level of precision.

Read more on the technology here.

The new POSITAL hollow shaft kit encoders offer excellent accuracy (+/- 0.02°) and dynamic response (up to 6000 RPM), making them suitable for use in critical motion control systems. However, what makes them especially useful in many applications is their shape. Both stator and rotor elements are in the form of disks with large central openings. This makes them an ideal choice in space-limited situations, such as servomotors, stepper motors or the joints in robotic arms , where it is desirable to have an embedded position sensor fitting around a central shaft or axle.

POSITAL hollow shaft kit encoders will be available in two sizes, with 30 mm or 50 mm internal diameters. Non-proprietary SSI and BiSS C communications interfaces are supported. 

Energy Harvesting – No Battery

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The energy harvesting system is based on the Wiegand effect and eliminates the need for backup batteries or complex gear systems. 

Read More about the Wiegand Effect

D&D Engineering – “W’ere YOUR Sensor Guys”
3835 E. Thousand Oaks Blvd. Suite 464 Westlake Village, CA 91362  – Voice: (818) 772-8720 Fax: (818) 772-2477 Toll Free: (888) 333-6474
Email: sales@sensorguys.com Website: www.sensorguys.com

Theory of Operation: FP-25 Field Flow Calibrator for PM Air Samplers

by Shruti Thakur

Alicat’s FP-25 and FP-25BT flow devices can be used to calibrate any low-volume particulate air sampler on your deck. These NIST- traceable field flow calibration devices are multi-parameter mass flow meters that display pressure and temperature. The FP-25 uses multiple pressure sensors to capture both ambient barometric pressure and internal flow stream pressure, resulting in all-weather accuracy.

These flow standards operate on the principle of differential pressure-based laminar flow measurement. The barometric pressure sensor monitors ambient atmospheric pressure and is housed within the instrument casing above the display.  The internal flow stream pressure sensor monitors pressure inside the FP-25’s flow body work in concert to generate flow and pressure readings. This sensor package monitors both differential pressure and absolute pressure within the flow stream directly. The FP-25 also uses two fast-responding temperature sensors, one mounted directly in the flow stream and one located at the tip of the external temperature probe. The FP-25 uses this raw data from the multiple pressure, temperature and humidity sensors to calculate both actual (volumetric) and standardized (mass) flow readings a thousand times every second.

Poiseuille’s equation for laminar flow measurement

Q=K∆P/Ƞ

At its heart, the FP-25’s flow measurement is based on laminar flow differential pressure technology. The FP-25 measures differential pressure, similar to Venturi products.  A stack of plates and spacers, called a laminar flow element, is used to laminarize the flow and create a pressure drop. A sensor measures the differential pressure across a section of the laminar flow element with known pressure drop, another measures the absolute pressure of the fluid and the flow stream temperature sensor measures the temperature of ambient air in the flow stream. By laminarizing flow, the Poiseuille equation can be used to determine the raw volumetric flow.

To the first order, the Hagen-Poiseuille equation can be used to determine the raw internal volumetric flow rate as follows:

Where:

Q = Volumetric flow rate

K = A constant factor determined by the internal geometry of the restriction

∆P = Differential pressure across the LFE

Ƞ = Absolute viscosity of air

Equation (i) demonstrated the dependence of flow rate on the gas viscosity. Because the actual viscosity of a gas varies with changes in temperature and relative humidity, the FP-25 continuously updates the viscosity value with live readings of flow stream temperature, relative humidity, and pressure to provide accurate flow readings all the way to 100% RH, at temperatures as high as 60°C.

Standardized Flow Measurement

M=Q(Ts/Ta)(Pa/Ps)

Once the raw internal volumetric flow rate has been determined, the FP-25 references the raw internal volumetric flow readings to standard temperature and pressure conditions (STP). The FP-25 ships with a default STP of 25°C and 1 atm for standardized (mass) flow readings, which matches the US EPA’s standard. Since the FP-25 is a laminar flow device, additional measurements have to be incorporated to determine the actual standardized flow measurement. To determine the standardized mass flow rate (M), two correction factors must be applied to the volumetric flow rate (Q): the effects of temperature and absolute pressure on density.
Together, the conversion to mass flow can be written as:

Where:

Ts = Absolute temperature (°K) at standard conditions (STP) in Kelvin

Ta = Absolute temperature (°K) at flow conditions in Kelvin

Pa = Absolute pressure at flow conditions

Ps = Absolute pressure at standard conditions (STP)

In the Alicat FP-25, discrete absolute pressure and temperature sensors are placed in the laminar region of the flow stream. This information is sent to the microprocessor to make the appropriate calculations to determine standardized mass flow.

Actual volumetric flow using the external temperature probe

Once the standardized flow rate has been determined, the FP-25 device references the standardized flow readings to ambient temperature using the temperature probe, and to ambient pressure using the barometer. This actual volumetric flow rate reflects the actual volume of air that passes into the air sampler (at the local barometric pressure and at the probe temperature) per unit time. Whenever the FP-25 is displaying volumetric flow referenced to the temperature reading of the external probe, the word Probe will flash on the right side of the display, alternating with the relative humidity value. Actual volumetric flow always appears at the bottom left of the FP-25 screen in Standard Mode.

Technology that works for you

The Alicat FP-25 flow device was developed in coordination with air monitor technicians and has resulted in a durable, accurate and easy to use device. The FP-25 comes in a kit complete with all the equipment required to complete calibration of any EPA approved air monitor.See the Alicat FP25 Device here

Shruti Thakur, MS Applications Engineer | India Liaison
Shruti holds a Master’s degree in Environmental Engineering and a Bachelor’s degree in Chemical Technology. She specializes in process improvement and design for environmental engineering applications including water treatment, air quality, and EPA regulated interests.

D&D Engineering – “W’ere YOUR Sensor Guys”
3835 E. Thousand Oaks Blvd. Suite 464 Westlake Village, CA 91362  – Voice: (818) 772-8720 Fax: (818) 772-2477 Toll Free: (888) 333-6474
Email: sales@sensorguys.com Website: www.sensorguys.com

The FP-25: Fast, Accurate, Reliable

by Shaina Shay

Alicat is proud to be part of the Halma family. Halma companies work to create a safer, cleaner, healthier future for everyone, every day. Alicat’s air monitoring products contribute to the environmental and public health component of this mission.

Saving the world, one calibration at a time

Our low-pressure drop Whisper mass flow meters are used by municipalities, cities, states, and countries to calibrate ambient air quality monitoring devices. Our mass flow meters are used to calibrate particulate monitoring (PM) machines, air sampling canisters, pesticide monitoring machines, and other analyzers. Calibration is important to ensure good data. Bad data can have political, legislative, and/or societal impacts. Because calibration takes time and skill, we worked with air quality technicians to specially design a product that is both compliant with the regulations of the Environmental Protection Agency (EPA) and meet the demands of air quality technicians.

The FP-25: Fast, Accurate, Reliable

The FP-25 is a highly precise, NIST-traceable device that can measure mass flow to an accuracy of +/-1% of reading. To make calibration faster and safer, there is a Bluetooth function which allows technicians to complete calibration from a distance. The device itself is built to be used in the field and can withstand being dropped from rooftops.

Learning from our Future Leaders

Alicat has been engaged in the air monitoring market for years, but we had the opportunity to view the FP-25 from a fresh perspective when Halma’s Future Leader Program came to visit. The Future Leaders program is comprised of intelligent, driven, and enthusiastic recent graduates. To encourage well-rounded growth, participants are exposed to a range of business related trainings through the program.

On May 17th 2019, 15 future leaders came to Tucson, Arizona to participate in a marketing training day at Alicat.

In just one day, future leaders paired off to develop a marketing content. The young leaders learned about Alicat’s history, products, and culture in the morning, and then had the afternoon to come-up with a plan.

We were astonished

Two teams took on the environmental market and focused on developing content tailored for the FP-25 product. The results were one full blown campaign plan and this video about why customers love the FP-25.

The proof is in the pudding

At the end of this day we were so impressed with the results. We never expected that there would be time to develop useable content, but we were wrong. This experience validated the how Halma is making their mission come true, by investing in people and companies that make things happen.

D&D Engineering – “W’ere YOUR Sensor Guys”
3835 E. Thousand Oaks Blvd. Suite 464 Westlake Village, CA 91362  – Voice: (818) 772-8720 Fax: (818) 772-2477 Toll Free: (888) 333-6474
Email: sales@sensorguys.com Website: www.sensorguys.com

WIEGAND WIRE ENERGY HARVESTING COMPONENTS

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POSITAL’s Wiegand assemblies offer a compact and efficient way of harvesting power for electronic circuits in electromechanical devices, eliminating the need for backup batteries. 

The operating principle of POSITAL’s Wiegand modules is simple. A “Wiegand wire” is a short length of specially prepared Vicalloy (vanadium-iron-cobalt) wire. When exposed to a changing external magnetic field (e.g. a nearby permanent magnet mounted on a rotating shaft) the Wiegand wire will initially retain its original magnetic polarity, and then abruptly ‘flip’ its polarity when the change to the external magnetic field reaches a certain threshold. This sudden change in the magnetic state of the core induces a current pulse in a copper coil wound around the Vicalloy core. This current pulse is very short-lived, but the energy harvested from the mechanical movement of the magnet can be captured and used to activate a low-power electronic circuit. An important feature of the Wiegand effect is that the amount of electric power generated with each reversal of the magnetic polarization is constant and completely independent of the rate of change of the external magnetic field, even if this happens very slowly. POSITAL Wiegand modules have been used to reliably power rotation counters in tens of millions of devices, including multi-turn rotary encoders, gas and water meters.

  • Production Since 1974 – Started by John R. Wiegand
  • Proven In Encoders & Water Meters Since > 10 Years
  • Used In Access Cards For > 30 Years
  • Power Supply For Future IoT Applications
  • High Energy Output of ~170 nJ

“The process for making Wiegand wire from raw Vicalloy wire was invented by John Wiegand in the 1970’s” comments Christian Fell, Chief of Technology Development for POSITAL-FRABA. “It involves a complex set of steps, including cold-working the wire through a combination of stretching and twisting, then heat-treating the product to lock in the desired characteristics.” POSITAL acquired the original wire-conditioning machinery and intellectual property from the Wiegand estate in 2013. Fell continues: “This acquisition has meant that we have reliable supply of Wiegand wire. It also gave us an opportunity to refine the manufacturing process for improved product quality. Thanks to our research, we can now produce wires that reliably generate 190 nanojoules of energy at 7 volts with each polarity flip”.

Wiegand assemblies are a core component in POSITAL’s IXARC multiturn absolute rotary encoders, providing a maintenance-free method for powering the counter that records the number of complete rotations that the device experiences. POSITAL also offers Wigand assemblies to other manufacturers. These consist of a 15mm length of Wiegand wire surrounded by a copper coil, all contained in an SMD-mountable plastic structure. Wiegand wire production is carried out at locations in the U.S. and Europe, ensuring a stable, reliable supply chain. These assemblies can be used wherever low-cost, zero-maintenance, battery-free energy harvesting systems are needed to energize electronic counters and other low-power electronic devices.

D&D Engineering – “W’ere YOUR Sensor Guys”
3835 E. Thousand Oaks Blvd. Suite 464 Westlake Village, CA 91362  – Voice: (818) 772-8720 Fax: (818) 772-2477 Toll Free: (888) 333-6474
Email: sales@sensorguys.com Website: www.sensorguys.com