Tag Archives: MEMS

Progression of MEMS Pressure Sensing

Welcome to All Sensors “Put the Pressure on Us” blog. This blog brings out pressure sensor aspects in a variety of applications inspired by headlines, consumer and industry requirements, market research, government activities, and you.

At Sensors Expo 2017, Jim Brownell, one of All Sensors’ sales managers, explained the progression of microelectromechanical system (MEMS) pressure sensing over the past 30+ years from All Sensors’ perspective.

Check out that interview here, courtesy of EE World Online’s Sensor Tips.

 

Comments/Questions?
Do you have a pressure sensing question? Let us know and we’ll address it in an upcoming blog.
Email us at info@allsensors.com

Media Isolated Pressure Sensors

Welcome to All Sensors “Put the Pressure on Us” blog. This blog brings out pressure sensor aspects in a variety of applications inspired by headlines, consumer and industry requirements, market research, government activities and you. In this blog we’ll be discussing media isolated pressure sensors.

Media Isolated Pressure Sensors

Unlike many other sensor applications, pressure sensors frequently have to contact some pretty nasty chemicals. Sensor manufacturers usually qualify their sensors for restricted usage with statements such as “intended for use with non-corrosive, non-ionic working fluids such as air, dry gases, etc.” This means that the user who has an application that does not meet these criteria, either cannot use a product that meets all the other application requirements or has to take steps to protect the sensor and assume any risk regarding the protection methodology.

In contrast, sensors designed specifically for harsh environments open many new applications in areas including medical, environmental controls, plant and mechanical engineering as well as automotive. In many cases, the technology changes for these more rugged sensors from a silicon, microelectromechanical system (MEMS) material to a ceramic material but still retains a monolithic design. A flush membrane makes it easy to interface these types of pressure sensors to hydraulic fluids and even extends the pressure range up to 6000 PSI. With the CPM 602 series, All Sensors now participates in these more demanding applications.

CPM 602

A ceramic pressure sensor overcomes many of the limitations of silicon-based MEMS pressure sensors.

What do you think/Comments?
Do you have a pressure sensing question? Let me know and I’ll address it in an upcoming blog.
-Han Mai, Senior Marketing Specialist, All Sensors Corporation (hmai@allsensors.com)

Summertime and the Livin’ is Easy – with Pressure Sensors

Welcome to All Sensors “Put the Pressure on Us” blog. This blog brings out pressure sensor aspects in a variety of applications inspired by headlines, consumer and industry requirements, market research, government activities and you. In this blog we’ll discuss pressure sensors for pool filters.

Summertime and the Livin’ is Easy – with Pressure Sensors

Well, it’s officially summer and one of the “livin’ is easy” moments occurs when you get to spend some time in a pool. While the pool is refreshing, there is a maintenance side and work involved in keeping it clean. The pool filter maintenance indicator is a pressure sensor that typically has a 0-60 PSI gage readout.

The pressure sensor measures a gage reading, the pressure in the filter, since it does not have to record flow. A normal operating pressure is observed when the pool filter is clean and running at a specified rpm. When the pressure in the filter increases by a few psi, it’s time for backwashing.

Since the gauge requires an operator to determine if it is time for backwashing, the sensors are simple mechanical sensors. For other filter applications that require an electronic signal, a MEMS pressure sensor usually is preferred to other sensor technology options for cost, ease of interface and reliability reasons. This is the case for commercial air filters and healthcare applications such as high-efficiency particulate air (HEPA) ultra-low penetration air (ULPA) filtration systems or ventilation units.

HEPA and ULPA filters are typically operated under pressure of approximately 203 mm (8in.) of water column. For these types of applications flow is typically measured, so a differential rather than static pressure measurement is made to determine when it is time to replace the filter. While measuring air simplifies the mechanical interface and avoids problems with liquids, the small ∆P measurement requires a specially designed pressure range to produce an easily managed output. In any case, this is an application easily handled by MEMS pressure sensors.

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What do you think/Comments?
Do you have a pressure sensing question? Let me know and I’ll address it in an upcoming blog.
-Dan DeFalco, Marketing Manager, All Sensors Corporation (ddefalco@allsensors.com)