Understanding Ceramic Pressure Sensor Models

Posted by Seta Davidian on Jul 29, 2015 9:25:44 AM

ceramic-group-pressure-headCeramic pressure sensors by Metallux of Switzerland are high quality, high performing sensors for harsh environments and/or higher pressures (models up to 800 bar). With various models including piezo-resistive, ceramic capacitive, monolithic, flush-mount, compensated, unamplified and more, a user reviewing ceramic pressure sensors may want some help understanding the various options.

me550

Piezo-Resistive Versus Capacitive: At a high level, Metallux ceramic pressure sensors are either piezo-resistive or capacitive pressure sensors. Why choose one over the other? Capacitive sensors are used when the pressure sensors must withstand high overpressures. In addition, capacitive models such as the ME550 (shown right) are very good at measuring low pressure down to 60 mbar. Both capacitive and piezo-resistive have similar chemical resistance and media compatibility.

me75xFlush Mount Versus Monolithic: In a flush mount sensor such as the ME77X Series, the sensor side exposed to the pressure media is flat and smooth. A monolithic sensor such as the ME75X has an indentation in the center of the exposed side. Why choose one or the other? If a customer is making an absolute or sealed gauge sensor, then flush mount is ideal as they have a fixed reference. Flush mount also come in lower (0.5 bar) and higher pressures (up to 600 bar). Flush mount ceramic sensors also have no dead volume of the pressure media.

Amplified or Unamplified: Another choice in ceramic pressure sensors involves whether or not to choose an amplified, calibrated sensor (ME75X, ME78X, ME790) or an unamplified model (ME501, ME504, etc). The choice depends on the users' requirements. For customers who do not have the capacity to amplify the signal and wanted a completely calibrated and temperature compensated sensor, Metallux offers many models with either a ratiometric, non-ratiometric, current loop, or I2C. The integrated signal conditioning lets users start using the sensors quickly. A user who is perhaps designing their own transducer will likely consider purchasing an unamplified model. Then, these users who typically have the experienced needed, can create a customized signal conditioning design based on their specific application requirements. 

Physical Size: Not all Metallux ceramic pressure sensors are the same size! The largest is the ME509 at 32.4 mm in diameter. The smallest is me ME657 at 12.85 mm in diameter. Many models are 18 mm in diameter.

Ceramic pressure sensors are a great choice if you are looking for higher pressures (up to 800 bar) in a harsh or wet environment. Gauge, sealed gauge and absolute models are also available. Strong chemical resistance due to the user of the AI2O3 ceramic lets users expose the sensors to a wide variety of environmental factors. Typical applications for Metallux ceramic pressure sensors include transducer development, tank level monitoring, process control and industrial automation.

We hope you found this blog post to be useful! Please feel free to reach out to us at info@servoflo.com with questions or comments. We welcome your feedback.

Download the metallux-family-tree here.

Download Ceramic Pressure Sensor Product & Pricing Guide

Topics: ceramic pressure sensor, pressure sensors

Why Choose Fujikura Pressure Sensors Over Freescale?

Posted by Seta Davidian on Mar 23, 2015 10:12:00 AM

pressure sensorsIn the world of pressure sensors, users have a broad range of manufacturers and part numbers to choose from. Although detailed specifications on individual parts are easy to come by, we thought it would be nice to provide a comparison between the new AP/AG pressure sensors from Fujikura to various Freescale sensors, including the MPXV7025, MP3V5050(V)/MPX(V)5050(v), MPX(V)5100, and MPX5500. The following summary provides details on how Fujikura pressure sensors offer higher performance and more flexibility for users.

  • More input voltage flexibility: All Fujikura AP/AG sensors come in a 3V, 3.3V or 5V supply. The Freescale sensors models listed above come in some but not all supply voltages.
  • Pressure range choices: With a broad selection of ranges from +/-100 kPa up to 1000 kPa, Fujikura offers many more choices.
  • Customization: In addition, Fujikura is willing to offer custom calibration and custom outputs in quantities that are normally too small for other manufacturers.
  • Accuracy: Fujikura offers +/-1.5% full scale accuracy versus +/-2.5% or +/-5% for Freescale pressure sensors.
  • Additional models with threshold detection (AP3/AG3) or digital outputs (AP4/AG4) 
  • Lower supply current: Freescale sensors require a 10 mA supply current. Fujikura, on the other hand, has a supply current of 3 mA for the 5V supply and 2 mA for the 3V and 3.3V supply versions.

Fujikura's stocking distributor (yes, Servoflo) has over 30 years experience selling and providing technical support for Fujikura pressure sensors.

Typical applications for these parts include sleep apnea, oxygen conservers, blood pressure measurement, ventilators, industrial applications and more.

Our experience over the last 30 years selling Fujikura have shown that these pressure sensors are high quality yet cost-effective for customers. The ability to easily customize sensors for customers' specific needs is a powerful consideration when comparing pressure sensors. We are proud of our relationship with Fujikura and look forward to showing you why!

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Topics: medical pressure sensors, gauge pressure sensors, blood pressure measurement, pressure measurement, pressure sensors, choosing a pressure sensor

mp6 Micropump in Medical Device for Fast Detection of Hospital Germs

Posted by Seta Davidian on Sep 15, 2014 12:57:00 PM
mp6 micropump medical

The mp6 micropumps from Bartels Mikrotechnik GmbH are suitable for pumping liquids and gases for a variety of different applications. Here we are highlighting the use of the mp6 in a germ detection device used in hospitals.

Bartels and the Austrian Gesundheits-Cluster Oberösterreich worked together with the project goal being the automation of "Genspeed", a medical system for fast diagnosis of hospital germs of Greiner Bio-One International AG. The newly developed on-spot instant diagnosis device "Genspeed R2" is able to verify the existence of different infectious germs - including, among others, antibiotic-resistant bacteria such as MRSA at the human body - from different samples within 75 minutes.

mp6 micropumpTechnological core elements of the device are a microfluidic-chip and a miniaturized automated dispensing system based on the mp6 micropumps. Different reagents can be disposed with microliter accuracy into the inlet opening of the microfluidic chip. The controlled liquid volumes are precisely applied in the correct succession with testing results shown on a computer screen. This method delivers results much faster than the traditional diagnosis chain of sending a sample to a laboratory. This is a perfect example of the capability of microfluidics in respect to optimization of standard processes, reduction of waiting times - and therefore costs - as well as improving patient treatment response times. This system uses 3 mp6 pumps and 1 mp6-oem controller.

Learn more about the mp6 micropump and also try our product & pricing guide for micropumps.

Micropump Product & Pricing Guide

 

 

 

 

Topics: piezoelectric pump, micropump

Why We Do Not Take Online Orders for Pressure Sensors

Posted by Seta Davidian on Aug 26, 2014 10:11:00 AM

pressure sensors

On our Servoflo website, you have likely noticed limited online ordering of pressure sensors. Even though we have a huge offering of pressure sensors from 0.1” to several thousand psi, there are specific reasons why we do not have an online store and parametric search for sensors.

Complexity of pressure sensor part numbers – Have you ever searched for a sensor and become completely overwhelmed figuring out the correct part number to order? Have you ever ordered a part and then realized after your purchase you made a mistake, and then had to order a different part?

Stock – have you had difficulty finding stock of a particular part, and then spent an afternoon browsing, clicking, and sorting through part numbers and manufacturers?

In short, trying to buy pressure sensors online can be a time consuming, frustrating experience. The sheer combination of permutations and combinations of part numbers make for nightmare scenarios for both purchasers and webmasters.

OK, so now after spending an afternoon browsing you may be completely confused by what you saw where. Now that you have come across various pressure sensors options (such as amplified versus unamplified), you may be wondering, what type of pressure sensor do I really need? What does this accuracy spec mean on this datasheet versus this accuracy spec from a different manufacturer? I need a specific package but I don’t see it…Let us show you how to get you out of this mess.

Just the other day, we received a telephone call from a potential customer. After 30 seconds of listening to the customer explain his application, David Ezekiel, our Vice President said, “I know exactly what you need, let me send you the detailed part information.” The customer was very appreciative and thankful for being put in the right direction. We knew how to answer his question because we had experience in his application combined with our vast knowledge of pressure sensors.

So, after you “Google” to find a pressure sensor supplier the next step is to “Servoflo it!”. Find the right sensor for YOUR application quickly and easily by either calling us at 781-862-9572 or emailing your specification through our sensor selector tool

Servoflo It!

Topics: pressure sensors, choosing a pressure sensor, designing pressure sensor

Sensors Expo 2014 Update

Posted by Seta Davidian on Jul 18, 2014 12:41:00 PM

UPDATE! Here is a short video clip of our booth and the products we showed! Thanks to Randy Frank at Design World for the video.

 

From June 25 to June 26, 2014, Servoflo exhibited at the Sensors Expo show in Chicago. We had a great time and thought it would be fun to share a couple of pictures of our booth.Servoflo Booth

The show was well attended, and booth traffic was busy on both days. We met many new customers interested in a wide variety of our products. Applications ranged from industrial, consumer, medical and more. It was interesting to see how many people traveled to come to the show, which also had many educational sessions. 

20140625 115510 resized 600

We enjoyed exhibiting next to our supplier ZMDI (a supplier of signal conditioning IC's, LED drivers, and power management IC's). Their special pink popcorn giveaway was very popular with booth visitors.

We hope to see you at next year's Sensors Show which will be held June 9 - 11 in Long Beach, California.

You can check out the official Sensors Expo highlights reel here.

(Above image is David Ezekiel of Servoflo providing visitors with sensing solutions!)

Topics: sensors expo, sensors

New Application Note on ZLSL7031 LED Driver IC

Posted by Seta Davidian on Dec 5, 2013 2:19:00 PM

ZMDI has released a new application note on the ZLSL7031 LED Driver IC titled "230VAC Buck-Boost Converter for 45 LEDs".

zsls7035 thumbnailThe ZSLS7031 is a high-brightness LED driver that supports both isolated and non-isolated LED lighting designs with active power factor correction (PFC). Designed for isolated flyback and non-isolated buck-boost applications, the ZSLS7031 has applications in PFC buck operation in special conditions.

The purpose of a buck-boost converter is to provide a constant output even if the input supply changes from lower to higher than the required output voltage. Like a flyback converter, the buck-boost converter can be active during the entire rectified sinusoid, allowing continuous PFC correction and low total harmonic distortion. The buck-boost topology provides better efficiency when the LED forward voltage is relatively high and the current is reasonably low as in the example given in this application note for a string of 45 LEDs in series at a current of 350 mA.

Key benefits of the ZSLS7031 include:

  • High efficiency of 90%
  • No optocoupler or secondary-side feedback device required
  • Safety features including thermal shutdown and over-current and over-voltage protection

The ZSLS7031 integrates over-current and over-voltage protection, as well as a thermal shutdown to halt the switching action in the event of abnormally high operation temperatures.

Download the complete application note here

If you have an LED driver IC application, the best use of your time is to utilize our LED help questionnaire located here. Simply fill out your requirements, and you will be contacted with specific part number suggestions for your application. 

Topics: LED Drivers, LED driver IC's

LED Driver IC Product Overview

Posted by Seta Davidian on Jun 17, 2013 11:51:00 AM

zled drivers group

Recently we received an updated product family overview for the ZMDI LED driver IC line. We find this chart to be extremely useful for understanding the various part numbers and capabilities. We hope you do too!

Embedded within the chart are links to the individual LED driver IC product pages. With efficiencies at 95-98% depending on the model, ZMDI LED driver IC's make a dramatic impact in creating energy efficient LED lighting solutions. 

LED Driver Product Family

Part

Type

Dimming

Iout

Effic.

Acc.

Pkg

 

ZLED7000

40V DC/DC Buck

DC/PWM

750 mA

<95%

<95%

SOT89-5

 

ZLED7010

40V DC/DC Buck

DC/PWM

750 mA

<95%

<5%

SOP8

Temp Comp

ZLED7020

ZLED7320

ZLED7520

ZLED7720 

40V DC/DC Buck

DC/PWM

1200 mA

1000 mA

750 mA

350 mA 

<98%

<3%

SOT89-5

DFN-5

DFN-5

DFN-5 

 

ZLED7030

ZLED7330

ZLED7530

ZLED7730 

40V DC/DC Buck 

Switch 

1200 mA

1000 mA

750 mA

350 mA  

<98% 

 <3%

 SOP8

 

ZLED7001

 8-450V Univ

DC Linear PWM

>2000
mA 

 ~96%

 NA

 SOP8

Temp Comp

ZLED7002

 Low Voltage Toggle

 NA

 250 mA

   

 SOP8

 

ZSLS7015

 35V DC/DC Boost

DC Linear PWM 

 ~800 mA

<95% 

 <5%

 MSOP10

 

ZSLS7025

 5-100V DC/DC Boost

 DC Linear PWM

 >2000
mA

 <95%

 <5%

 SOP8

 

ZSLS7031 

 Active PFC Flyback

 DC Linear PWM

 >2000
mA

 <85%

 

 MSOP8

 

Typical applications for LED driver IC's include:

  • Retrofit lighting
  • Street lighting
  • Traffic lighting
  • Architectural lighting
  • Industrial lighting and much more!

All ZMDI LED driver IC's have small footprints and high levels of integration, thus minimizing the need for additional parts to run these IC's.

If you are interested in estimated pricing of these LED drivers, take a look at our LED driver Product & Pricing Guide. This 5 minute overview provides estimated costs of various ZMDI LED drivers.

Topics: LED Drivers, LED driver IC's

4 New Tech Notes Added for MP6 Micropumps

Posted by Seta Davidian on Apr 30, 2013 2:46:00 PM

Since the end of 2012, Servoflo has been selling the mp6 micropump, made by Bartels of Germany.

mp6 micropumpThis unique micropump focuses on pumping up to 7 ml/min of water and 18 ml/min of air/gas. Other liquids can also be pumped. Typical applications for the micropump include medical drug delivery, cell culturing applications, fuel cells, consumer, nebulizers and much more.

mp6 micropumpThe functional principle is based on a piezoelectric diaphragm in combination with passive check valves. A piezo ceramic mounted on a coated brass membrane is deformed when voltage is applied. By the resulting down stroke, the medium is being displaced out of the pump chamber below. The check valves on both sides of the pump chamber define the flow direction. 

The response to this product has been tremendous, and we are excited about the many new possibilities for this interesting product.

Bartels has release 4 new tech notes to assist customers in their use of the pump:

Amplitude and Frequency Effects on Flow Performance - Based on the diaphragm pump principle, themp6 has a typical flow and pressure performance. By controlling the piezo actuator deflection, the performance can be varied. The amplitude determines the height of the piezo deflection and thereby the displaced volume and the frequency the number of deflections.

Running Multiple mp6 Micropumps - Applications requiring higher flow rates can be done by combining pumps together, in either series for higher backpressure situations (600 mbar for liquid) or in parallel for higher flow rate (about 7 ml/min per pump for water).

Media Compatability of the mp6-pp - The mp6-pp is a polypropylene version of the micropump. This table shows the chemical resistance of the polyproplyene for different media.

Viscosity Effects on Pump Performance - This note discusses the effect of different viscosities on pump flow and pressure performance.

In addition, there are many other application notes and demonstration videos which may be of interest. 

See a listing of all application notes

Check out video demonstrations of the mp6 pump

Review technical specifications of the mp6 micropump

Ask For Pricing

 

 

 

 

 

Topics: piezoelectric pump, micropump

The Most Common Mistake Made When Selecting A Pressure Sensor

Posted by David Ezekiel on Sep 26, 2012 11:52:00 AM

sample pressure sensorSelecting a pressure sensor for your application sounds simple, but with the huge amount and range of performance options, it's easy to get overwhelmed with what the best model is for your application.

We have seen situations where designers choose the most expensive and most accurate part for their needs at the beginning of the design. It's the path of least resistance. However, once production arrives and cost reduction is required, most especially for high volume applications, the established, set-in-stone design specification does not allow for a lower cost option without sacrificing performance. The engineer is stuck or needs to initiate a costly redesign.

To prevent this situation from occurring, we suggest starting with the widest tolerance (and hence lower cost) pressure sensor. Through your testing and evaluation phase, you may find that the lower tolerance models can work. In particular, if you have the ability to provide your own calibration or additional signal conditioning, you may discover that an acceptable specification is met. Furthermore and most importantly, it is significantly easier to move up the price/performance chain than going down it. Flexibility is designed in should performance requirements tighten in the future.

Once the target accuracy is determined for a product, designers should then look at sensor options in conjunction with their ability to add value (such as calibration, temperature compensation, signal conditioning). This is the classic make versus buy question which must be asked. We can help with the answer!

If you have an application for a pressure sensor and have limited resources on finding a solution, tell us your needs and let us do the work for you.

Try Our Sensor Selector Tool

Topics: pressure sensors, choosing a pressure sensor, picking pressure sensors, designing pressure sensor

Pressure Sensor Aids Medical Application

Posted by Seta Davidian on Sep 13, 2012 10:56:00 AM

InControl Medical, located in Wisconsin, is a medial equipment company offering solutions for female urinary incontinence, a common problem among women, particularly after childbirth. At least 20% of the female population in the United States experiences this problem. Previous offerings to solve this health problem were uncomfortable, yielding poor results that often lead to invasive surgery to correct the pelvic floor.

female urinary incontinenceIn response to this problem, InControl Medical created InTone, which combines electrical muscle stimulation and biofeedback to create a non-invasive home-use solution offering more comfort, better tracking, and thus improved results for patients. The patented probe, shown below, contains a small pressure sensor that measures the change in pressure inside the probe when the muscle contracts against it. This data is tracked in the handheld control unit that acts as a portable therapist, guiding the patient with visual and audible instructions to ensure exercises are done correctly. Precise gains in pelvic floor muscle strength are documented in one one-hundredth of a pound per square inch. Each session is date stamped and weekly averages are calculated to compare against previous weeks, thus allowing health care providers to follow the patient's progress.

About the pressure sensor

Gauge (gage) pressure sensor SLP33AWhen selecting a pressure sensor, InControl turned to Servoflo to assist in finding a solution. After evaluating their application requirements, Servoflo suggested trying the SLP33A Pressure Sensor Series, a high performing gauge pressure sensor with a 0-2 psi range and a linear 0.5 to 4.5 volt output. Because the temperature range in the application is narrow, InControl is able to optimize the output resolution and accuracy to provide data to one one-hundredth of a pound per square inch. This pressure sensor also accepts a low power supply of 2.2V to 3.3V and a small size of 10 mm X 8.6 mm, making it a perfect fit for portable medical applications. The pressure sensor is available as a 6 pin dual-in-line package or surface-mount. The high performance combined with low cost made it an ideal choice for InControl Medical. Obtain detailed specifications about the SLP33A pressure sensors.

InTone, InControl Medical, female urinary incontinence,To learn more about InControl Medical, please visit their website at www.incontrolmedical.com.

 

To learn more about pressure sensing solutions from Servoflo, please visit www.servoflo.com. Servoflo is a provider of pressure sensors, humidity sensors, sensor signal conditioners, and LED drivers for the medical, process control, HVAC, automotive and other industrial applications. 

 

 

Topics: medical pressure sensors, gauge pressure sensors, pressure sensors

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