Merit Sensor Demonstrates Pressure Measurement in a Diesel-Particulate Filter

We take pride in our pressure sensors and like to show what they can do. Recently at the Sensor+Test trade show in Nuremberg, Germany, we used a diesel-particulate filter (DPF) to demonstrate how our sensors can be used to indicate when a DPF is clogged with particulate and needs to be regenerated.

DPF demo Sensor+Test

Visitors at our Sensor+Test booth viewing our DPF demo

A couple of our senior engineers integrated one of our pressure sensors into a modern-day DPF. This engineering work included designing and 3D printing a coupler to connect a fan to the input end of the DPF, simulating the flow of exhaust; 3D printing a custom fan guard and generic housing for the pressure sensor; and programming a microprocessor to vary the fan speed automatically.

Our TR Series is an ideal choice for the DPF because it is impervious to harsh media, such as exhaust, and contains a MEMS die that ranges from 0 to 500 psi. For this application the MEMS die in the TR Series would be produced in a gage configuration, enabling it to measure pressure from the backside as well as the top side. The TR Series would then be calibrated for a differential output.

DPF diagram TR Series

Diagram of the TR Series measuring differential pressure, or ΔP, in a DPF

The main purpose of this demonstration was to show another one of our solutions to a real-world application. The DPF is just one of many applications for which our products are designed. We thrive on understanding our customers’ applications and providing the best solution for each one.

Merit Sensor Employees Serve Breakfast

A group of Merit Sensor employees and their families recently cooked and served breakfast to parents staying at Salt Lake City’s Ronald McDonald House. Guests at the facility live outside the Salt Lake area and have children who require medical attention in Salt Lake City. The Ronald McDonald House provides these parents a place to stay, allowing them to be near their hospitalized children. The meals are provided exclusively by volunteers.

Merit Sensor Ronald McDonald House

This service opportunity allowed the families of Merit Sensor employees to become acquainted with one another. The kids were happy working together; even the youngest of them flipped and served pancakes. The older kids scrubbed dishes and made cookies, while the adults cooked sausage, eggs, and bacon.

The event was organized by Wayne Rowley, manager of purchasing and procurement at Merit Sensor, who, in this case, procured the food. Many of Merit Sensor’s employees work hard not only to produce and provide pressure sensors, but also to make their community a happier place.

Rick Russell Addresses the Micro Nano Technology Special Interest Group at the University of Utah

Merit Sensor’s president, Rick Russell, spoke recently as the keynote speaker for the Micro Nano Technology (MNT) Special Interest Group to a group of approximately 80 U.S. college educators gathered at the University of Utah. The event is “a venue to share ideas and learn from others who work to educate technicians, a place to stay on the forefront of industry and workforce needs, and a forum to network and share ideas on ways to strengthen and augment workforce development programs through educational partnerships with industry for tomorrow’s micro and nano technology workforce” (MNT 2017 Special Interest Group Program).

Rick Russell, Micro Nano Technology

Rick Russell, President of Merit Sensor, was presented with a 6-inch wafer as a token of appreciation for addressing the Micro Nano Technology Special Interest Group at the University of Utah on July 18, 2017.

With over 20 years of experience working with MEMS (microelectromechanical systems), Rick has valuable industry insight to offer educators and their students. In his speech he emphasized the importance of teachers stimulating students’ interest in science and experimentation and the importance of pulling some of the less-than-stellar students out of their shells because, he argued, they are sometimes the most valuable employees in the workplace. “I can’t say enough,” he said, “about getting the kids involved.” Organizations like the Micro Nano Technology (MNT) Special Interest Group are important to companies, like Merit Sensor, that value the way students are educated and encouraged. Some of the students could end up working in the field of MEMS pressure sensors and even for Merit Sensor.

The workforce at Merit Sensor by in large comprises electrical, mechanical, and chemical engineers; technicians; and operators. The company is highly dependent on technical knowledge and skills and, therefore, looks to today’s students to bring fresh knowledge and enthusiasm to help it stay at the forefront of the industry in the face of tomorrow’s challenges.

Custom Pressure Sensors for the Aerospace Industry

The aerospace industry is known for having some of the harshest environments on the planet and finding a pressure sensor to withstand those harsh environments can be extremely difficult.  The TR Series pressure sensor and HM Series MEMS sensing element are built to withstand temperatures as low as -40°C and as high as 150°C, making them ideal candidates for the Aerospace industry.  The TR Series and HM series measure pressure via direct media pressure sensing to the backside of the die.  Direct media pressure sensing translates into excellent system design flexibility leading to lower cost and ease of manufacture.

TR Aerospace Image

TR Series – TR Series with Ferrule – HM Series Die

So whether your application is Flight control surface positioning, auto-pilot, jet engine throttle and thrust reverser controls, auto-pilot input, landing gear steering and thrust vector control, turbine guide vane, valve controls, turbine actuators, and engine controls or any other number of Aerospace applications Merit Sensor has the right sensor assembly or MEMS sensing element for you.

Merit Sensor Systems, Inc. has partnered with customers for more than 20 years to design, fabricate, assemble and package reliable, cost-effective piezoresistive pressure sensor solutions.

Merit Sensor offers full-service design capabilities, in-house wafer fabrication, flexible shipping, packaging and assembly, piezoresistive technology (PRT), expansive pressure ranges (0.15 psi to 15,000 psi), complete pressure measurement (absolute, gage, differential and vacuum). Additionally, Merit Sensor is able to provide unparalleled flexibility to customize pressure sensing solutions to fit into our customers’ applications. Most customers in the Aerospace industry require a high level of customization because of the demand of the applications.

Unlike other pressure sensor suppliers, Merit Sensor can provide customers with completely customized pressure sensor designs with large or smaller/limited production runs. Our customers range from pressure sensor transducer manufacturers who are already experts in pressure sensing technology and rely on Merit Sensor for highly stable and sensitive MEMS sensing elements (bare die), to customers who have little to no experience in the pressure sensing world and look to Merit Sensor to assist with a completely custom design and implementation of a pressure sensor that best fits their application.

At Merit Sensor our engineers are application experts. We are ready to help customers design your application to work with a pressure sensor, and/or design a customized pressure sensing solution that works for your application. If you are unsure whether a pressure sensor is right for your application, Merit Sensor can help you make that determination.

More questions? Request a quote for a pressure sensor to meet all your automotive engineering needs.

TR Series for Medical Pressure Sensor Applications

When it comes to your patients, you know what’s best. If you could have everything your way, you would. With Merit Sensor’s piezoresistive pressure sensors, you can.

In 1991 when Merit Medical needed a reliable pressure sensor for one of its devices, their search for the right pressure sensor turned up empty. It was then that Merit Sensor was born and we have been constantly innovating to design and customize industry-specific solutions for all your pressure sensing needs ever since.

Our latest innovation, the TR Series, combines Merit Sensor’s proprietary Sentium MEMS piezoresistive technology with state-of-the-art pressure sensor ASIC signal management for best-in-class performance. The TR Series can be used in air pressure sensors, liquid pressure sensors, and gas pressure sensors. It is designed for harsh media compatibility over extreme and extended temperatures (-40°C to 150°C) with a total error band of less than 1%.

We know there are a lot of unpredictable variables you deal with in the medical industry. Pressure sensors shouldn’t be one of them. Whether used in diagnostic or analysis equipment, our MEMS pressure sensors are designed for unparalleled accuracy and reliability.

Further customization options include:

  • Full-service design capabilities
  • In-house wafer fabrication
  • Flexible shipping, packaging, and assembly
  • Piezoresistive technology (PRT)
  • Expansive pressure ranges (.15 psi to 15,000 psi)
  • Absolute, gage, differential, and vacuum pressure measurement

Explore our pressure sensor customization options further or request a quote on our existing series. Whatever your needs, we are your match. If we can’t build it for you, we’ll find someone who can.

Pressure Sensor For All Your Automotive Engineering Needs?

There’s a reason you are still looking for the right automotive pressure sensor. It’s never been on the market… until now.

At Merit Sensor, we are constantly innovating to find the best design. ‘Best’ might seem like a relative term, but not when it comes to our product. Our latest innovation, the TR-Series Pressure Sensor, is the ideal application for high-performance automotive applications.

When it comes to automotive engineering, there are plenty of pieces to the puzzle. Pressure sensors are one of them. Multiple, to be more accurate. Everything from airbag to oil pressure sensors.

We could talk features all day.

You want to know about PSI? It ranges from 30 to 300 PSI.

Flexibility? The TR-Series is designed with sensitivity, resistance, bridge constraint, and more. But forget features. When it comes down to it, you have to be able to trust a pressure series.

Like you, we never know where your automobiles will end up so we plan for the unexpected and the impossible. From freezing temperatures of -40° C to a boiling 150° C, the TR-Series pressure sensor is designed for optimal performance in almost any temperature for extended periods. The TR-Series is a harsh media sensor, so it’s compatible with any harsh environment the pressure sensor could be exposed do including air, liquid, and gas.

The TR-Series was designed for all your automotive pressure sensor needs.

TR-Series-oil-pressure-sensor

The TR Series pressure sensor is used in the following applications:

  • Transmission pressure sensor
  • Oil pressure sensor
  • Fuel rail pressure sensor
  • EGR/Exhaust pressure sensor
  • Fluid pressure sensor, fuel pressure sensors, and other liquid pressure sensor
  • Fuel tank pressure sensor
  • Fuel vapor pressure sensor
  • Fuel rail pressure sensor

More questions? Request a quote for a pressure sensor to meet all your automotive engineering needs.

How to seal an O-ring to a TR Series Pressure Sensor

Merit Sensor offers a fully calibrated, back side pressure, harsh media, pressure sensor for use with any media which are compatible with Silicon, glass, ceramic and solder. This sensor assembly (TR-Series) was designed to be used with an o-ring, creating a face seal to the back of the sensor.

 

There are many technical considerations that need to be evaluated when designing for an o-ring face seal. To ensure that a good design can be achieved during the first round of development, several factors must be clearly defined.   This information will be critical in subsequent material selections (for both the o-ring and the housing into which it will be inserted) and will be required in the subsequent dimensional and stress analysis.

 

Specifications

Temperature Specification

  • Identify the minimum and maximum end use temperatures for both the operation and the storage conditions.  Will the use temperature will be constant or fluctuating? Will the pressure be changing at the same time?

 

 

 

Pressure Specification

  • Identify the minimum and maximum use pressures. Will the pressures be all positive, all negative or a combination of both positive and negative? Will the pressures be fluctuating or constant? Will the temperature be changing at the same time?

 

 

Media Specification

  • Identify the media that will be in contact with the sensor. What chemistries do they contain? Are they compatible with Silicon, Borosilicate Glass, 96% Alumina Ceramic and Solder?   What will be the exposure conditions (temperature, pressure, duration, concentration, etc.) Be sure to think about both sides of the sensor. The backside will be exposed to the harsh media. The front side will be exposed to some other environmental conditions. Be sure that the “top side” is protected from the harsh media.

 

http://www.applerubber.com/src/pdf/chemical-compatibility.pdf

 

O-Ring Options

Material Options

  • The o-ring material should be selected based on the information specified above. The o-ring softness should be selected base on the maximum use pressure and the resulting packaging stresses. A soft o-ring will provide a very compliant seal which will result in very low induced packaging stresses but may not be able to seal well at high pressures. A hard o-ring conversely would seal well at high pressures but may also induce high packaging stresses. Different o-ring materials have different temperature handling capabilities. The glass transition temperature of the polymer will limit the lower functional operating temperature of the o-ring. The temperature at which the polymer begins to decompose or soften will limit the upper functional temperature of the o-ring. It is also important to look at the media compatibility of the different o-ring polymers. The longevity of the o-ring and the amount of swell that the o-ring will experience will be different depending on the o-ring material and the media. It may be difficult to find the exact right material to match all of the specification requirements.

 

http://www.applerubber.com/src/pdf/general-properties-of-orings.pdf

 

 

 

Geometry Options

  • After the material selection, the determination of the o-ring size (OD and cross-section) is the next thing to consider. The o-ring should accomplish several different goals. The o-ring must ensure that the media will not leak at minimum and maximum pressures. The o-ring must ensure that the media does not leak at minimum and maximum temperatures. The o-ring should be chosen to minimize package stress buildup during pressure and thermal cycles.
  • There are several different o-ring geometries that can be used for face sealing. Each of them has advantages and disadvantages. The most common and cost effective o-ring geometry is the standard circular cross-section. This geometry can be used for both positive and negative pressures. To assist with high pressure sealing, backer rings can be used to prevent issues with squeeze-out. In addition to the circular cross-section, there are “X” and “U” shaped o-ring cross-sections. The “U” shaped o-ring comes in two configurations that could work as a face seal (inward facing channel for positive pressure applications, outward facing channel for negative pressure applications). The “X” cross-section will work in either application.

 

 

O-Ring Gland Options

Counter Boar Gland

  • The counter bore gland is the most common o-ring gland. It is relatively simple to design and manufacture. The gland depth and width can be tailored to work with the specific application specifications. Items that need to be considered are the squeeze percentage, the swell and the coefficients of thermal expansion.

 

 

Dovetail Gland

  • The dovetail gland is the most complicated o-ring gland. It is difficult to design and is expensive to manufacture. The primary benefit of this gland design is that it will assist in holding the o-rings in place during assembly. It is not recommended for small o-rings. This design is even more sensitive to the squeeze percentage, the swell and the coefficients of thermal expansion.

 

Suggested Engineering Analysis and Verification

To ensure that the o-ring will seal properly over the full temperature and pressure use ranges, several different analyses should be carried out. It is important to look at static forces, dynamic forces and the effects of temperature on each.

 

Static and Dynamic Analysis

  • It is important to calculate the dimensional changes that will happen with temperature. The OD, ID and cross section diameters of the o-ring should be calculated at the Min and Max temperatures. The width and depth of the gland should be calculated for Min and Max temperatures.   The o-ring squeeze should be calculated at each of these extremes to ensure that the gland dimensions are adequate. Be sure to take into consideration the swell for the o-ring material base on the media in contact with the o-ring. Based on these dimensions, the zero pressure stresses on the package can be estimated.
  • The static model should then be used to evaluate the stresses during changes in both temperature and pressure. Based on the output of this analysis, a suitable combination of o-ring size, o-ring material and gland dimension can be selected to provide the optimal solution.

 

Because each application is a very unique combination of temperature, pressure and media, it is recommended that verification testing be carried out by the customer to ensure that the o-ring material, o-ring cross section and the gland dimensions will provide a robust solution in the final application.

TR Series Pressure Sensor Based Inches of Water Pressure Switch

In many situations there is a need to know the level of a liquid in a tank or the pressure inside of an air duct. Both of these cases are quite low pressure and can be difficult to measure. This can be accomplished in several ways. The simplest is a sight glass or sight tube, as shown below. This works on the premise that liquid in the tank will force liquid up the sight tube to the same level as what is in the tank, or the air pressure being measured will raise the liquid level equal to the pressure applied. A monometer is a commonly used device for measuring low air pressure/vacuum. This is particularly useful in a tank that is not transparent, or at least translucent. In the case of an air duct, there is nothing visible so an external device of some sort is required. Although this is a simple approach, it is not particularly convenient because it needs to be located at the tank or close to the duct being measured. This is not useful if remote monitoring is required, and even less useful if any sort of feedback is desired as it is completely manual.

Tank with Sight Glass

Tank with Sight Glass

If remote monitoring of the level is required, there are several more options. A common example is a float type resistive (potentiometer) sensor, as typically found in an automotive fuel tank level sending unit. These sensors work well, but have some drawbacks.

  • Located in the tank
  • Displace some volume in the tank
  • Moving parts
Tank with Float Type Level Sensor

Tank with Float Type Level Sensor

Tank with float type level sensor

Depending on the media being measured, and the design of the components, this type of sensor can fall victim to malfunctions caused be the media itself. A common issue is the float absorbing the media it is submerged in, which would result in an artificially low level reading because the float will lose some buoyancy.

Tank 3

In order to provide a reliable level sensor, one with no moving parts is very desirable. To accomplish this, a sensor such as Merit Sensor Systems’ TR series could be utilized. The TR series pressure sensor is a piezoresistive MEMS pressure sensing element paired with an ASIC on a ceramic substrate. The sensor is available in many pressure ranges, gage or absolute pressure measurement as well as custom calibration and output.

In order to realize the most accurate level reading possible a gage part should be used. This is preferred because the atmospheric pressure acting on the fluid in the tank will also act on the reference side of the MEMS pressure sensor providing the most accurate reading even while atmospheric pressure changes. In the case of a differential air pressure measurement, the reference can be atmospheric or another space. Some examples of this are:

  • Building duct static pressure measurement (atmospheric to pressurized duct (inches of water typically))
  • Building high duct static pressure (similar to regular duct static, but typically wired into the fan controller to turn off the fans if the pressure exceeds a safe level for the building and air supply system (inches of water typically))
  • Building air filter status (differential pressure across filter – larger differential as filters become blocked (inches of water typically))
  • Building space to space pressure (differential pressure between two spaces to ensure air flow is going in the right direction – common in clean rooms (tenths of an inch of water typically))

Graph 1

Measuring levels, for media such as water or air, is difficult as one inch of water measured at 39°F is a mere ≈ 0.0360911906567 PSI. Merit’s TR series is offered in a high sensitivity (low pressure) configuration that, when calibrated to 5 PSIG, could resolve to 1” of water. It is possible to achieve better resolution with a different calibration and/or custom MEMS device with higher sensitivity.

Below is a plot showing the difference between a 5PSIG calibration and a 1 PSIG calibration. There is a significant difference in the output of the sensor, giving much better resolution.

Once the sensor with an acceptable resolution has been selected there are options for the sensor interface. The TR series sensor provides a linear voltage output of 0.5 to 4.5V from minimum pressure to maximum pressure, and it is temperature compensated. This voltage can be monitored by a system controller or simply connected to a circuit, such as the one below, which would provide a variable level threshold via VR1. This could be used as a low level indicator/alarm or a overfill indicator alarm, depending on the configuration of the circuit.

Basic circuit for variable pressure level switch/indicator

Basic circuit for variable pressure level switch/indicator

Below is an example of the operation of the above circuit. This is an ideal, theoretical, example. With VR1 set to a calculated voltage for the desired level (10” W.C. in this case, or ~1.94V), the output of U1 will go high when the sensor voltage reaches the setpoint of VR1.

Graph 4

Whether a variable signal is desired, or a simple ON/OFF will suffice, a low pressure TR series sensor can be used. Several of the applications discussed here are currently handled by other sensor technologies, but could be handled very well by a properly designed, and implemented, MEMS based sensor.

Something Fishy – TR Series Demo

Something Fishy – TR Series Demo

Merit Sensor introduced a new product demonstration for their TR Series MEMS pressure sensor at Sensor+Test in Nürnberg, Germany (May 19-21, 2015) and Sensors Expo in Long Beach California (June 9-11). “Something Fishy” was the brain child of 3 of our very talented engineers, Greg Liddiard, BJ Minson, and Chris Peterson, who designed and built a demonstration that showed the excellent stability and accuracy of the TR Series pressure sensor and its harsh media compatibility.

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TR Series Pressure Sensor

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TR Series Pressure Sensor with Ferrule Port

 

 

 

 

 

 

 

 

 


In Q2 of 2014 Rick Russell, President of Merit Sensor, announced an engineering competition for all of the engineers within the Sensors division to come up with a trade show and exhibition demonstration. The winning entry was “Something Fishy” by Greg Liddiard, BJ Minson, and Chris Peterson. Initially the design was a large clear tank that would contain many mechanical fish using pressure sensors to sit at a specific level within the tank. Someone would then stir up the water in the tank and send the mechanical fish off in different directions and at different depths, and as soon as the stirring stopped the fish would go back to their specific levels within the tank. This design posed an issue though as we could only control the height of the fish in the tank but not where they sat on the horizontal axis. As a result the three engineers decided to simplify the design by using just one mechanical fish (aka “Squido”) in a vertical tank. By using the single fish in a vertical tank we were able to show the accuracy and stability better than had we used the large tank with many fish. In addition this also afforded the engineers to connect the Squido via Bluetooth to a tablet and write an app to be able to control Squido in real time with a real time reading of the pressure within the tank.

Photo Jun 11, 11 31 53 AM Photo May 19, 2 47 05 AM

The Wheatstone Bridge

Introduction to the Wheatstone Bridge

The heart of Merit Sensor’s pressure sensors is a Wheatstone bridge that is comprised of a group of four resistors on a silicon etched diaphragm. As pressure is applied to the diaphragm the resistors are stressed, changing their resistance.

In an ideal setting, all of the resistors would be perfectly matched and completely temperature independent.

In the real world, however, differences exist between the resistance values of each resistor. In addition, temperature also changes resistor values. The change to resistor values and the overall bridge output due to temperature is known as the Temperature Coefficient of Resistance, or TCR.

Many applications require that a pressure sensor operate independently of temperature. In these applications, the pressure sensor’s TCR must be compensated for.

There are two general methods for TCR compensation – passive and active.

In passive compensation, the individual bridge resistor values will need to be measured in order to determine values needed for the compensation resistors.

In active compensation, a microcontroller, signal conditioner or analog circuit records the bridge output across various temperature and pressure conditions and adjusts sensor outputs accordingly.

Bridge configurations

a. Closed – A bridge in which all resistors are connected (See Figure 1).

AN103 Bridge Configuration Options - AN103-001
Figure 1 – Closed bridge

In a closed bridge there is no way to measure individual resistors as there will always be influences from the other three resistors of the bridge.

b. Half Open – A bridge that is divided into two branches and connected at one end (See Figure 2).

AN103 Bridge Configuration Options - AN103-002
Figure 2 – Half open bridge

In contrast to the closed bridge, a half open bridge allows measurements to be taken for each resistor, which is a benefit if the sensor’s performance needs to be determined. A half open bridge also allows for either active or passive compensation to be added as needed.

A half open bridge requires an additional electrical connection.

c. Full Open – A bridge that is divided into two branches, which are open at both ends (See Figure 3).

AN103 Bridge Configuration Options - AN103-003
Figure 3 – Full open bridge

Similar to the half open bridge, the full open bridge allows for each resistor to be measured. In addition to being able to use either active or passive compensation, each half of the bridge can be powered and measured independently. This is beneficial as some signal conditioners commonly used in pressure sensor applications require two independent branches.
However, the full open bridge configuration requires an additional electrical connection beyond that required by the half open configuration.

Examples of Implementations

a. Closed – Since individual resistors can’t be measured in a closed bridge, a closed bridge can be used with active compensation or in an application where sensor output fluctuations due to temperature changes are acceptable.

Figure 4 depicts a closed bridge with active compensation.

AN103 Bridge Configuration Options - AN103-004Figure 4 – Closed Bridge with Interface device (Signal Conditioning ASIC, Microcontroller, Analog circuitry, Etc.)

One example of a suitable application for a closed bridge where temperature independence is not critical is a pressure switch, where the absolute pressure measurements are not as important as knowing you’ve reached a pressure threshold.

b. Half Open – Active compensation can be applied to the half open bridge as in Figure 4 shown above. Passive compensation can also be applied to the half open bridge as seen below in Figure 5.

AN103 Bridge Configuration Options - AN103-005

Figure 5 – Half open bridge with passive compensation

The implementation of a half open bridge with passive compensation in Figure 5 shows the added components as well as the extra electrical connection (Vin+) required to close the bridge. The additional resistors, as they are named, accomplish span, zero and output impedance compensation. These components need to be added after open bridge measurements have been taken at the required conditions.

C. Full Open – The full open bridge has a wide variety of implementations. In addition to being used as a full open bridge it can be used as a half open (Figure 5) or a closed bridge (Figure 4). Figure 6 is an illustration of how a full open bridge could be used for two functions – temperature and pressure.

AN103 Bridge Configuration Options - AN103-006

Figure 6 – Full open bridge with two functions

In this implementation, half of the bridge is being used as a temperature sensor and the other is being used as a pressure sensor. Only half the pressure output signal will be present because there is only the voltage swing of half the bridge. However, this allows for the added benefit of a means to measure actual die temperature. The temperature measurement will allow for a more accurate input for temperature compensation than an ambient temperature measurement would.

Choosing the Appropriate Configuration for your Application

The entire sensing system should be taken into consideration when making decisions about the bridge configuration. First, the user must decide if temperature independence is important and if it is, whether active or passive compensation will be used. If active compensation is chosen and a signal conditioner or other electronic device will be used, that device’s requirements must be met.

Use caution as devices with similar functions may have very different requirements.

As previously discussed, each configuration has its own benefits and drawbacks. The added electrical connections of a full open bridge add to the complexity of assembly but allow for more flexibility as well as the ability to more easily troubleshoot bridge issues.

Ultimately, the choice of bridge configuration should be based on a thorough analysis of the system.

 

 

 

 

 

 

 

Disclaimer Notice
Merit Sensor Systems produces high quality products that perform within the parameters of the data sheet. Typical pressure and temperature performance values are not tested 100% but they have been validated during qualification. Merit Sensor cannot guarantee that the product will function properly after mounting and post processing by the customer. It is the responsibility of the customer to test and to qualify the function of the Merit Sensor product in the final package. Customer is responsible for the required knowledge to handle product and Merit Sensor assumes no liability for consequential damages that may result in yield loss or field failures in the final application.
THE INFORMATION IN THIS DOCUMENT IS PROVIDED TO YOU “AS IS” WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, WHETHER EXPRESS OR IMPLIED. Merit Sensor Systems reserves the right to modify this document and assumes no responsibility for any failures that result from the use of this information. All information provided in this document is for illustration purposes only.