Focus: Pressure sensor measurements in medical applications
Medical device designers must consider the thorny issue of withstanding condensing humidity when selecting a pressure sensor. Often, they need to weigh the trade-offs between feature features, package types, and costs. In addition to this, in addition to the bulky heavy-duty media isolation pressure sensor, there are few other sensing options available for medical devices. This pressure sensor was once the only choice before the introduction of a board-mounted sensor compatible with liquid media.
For applications with medium to low pressure requirements, including gas/liquid chromatographs, chemical analyzers, ventilators and blood analyzers and diagnostic equipment, pressure sensors must not only be in direct contact with liquid media or withstand humid conditions, but also It also provides highly accurate pressure measurements for a variety of media such as exhaled gases, reagents, samples, and cleaning solutions. Board-mounted pressure sensors are often the solution of choice for applications with pressure ranges below 150 psi and in tight spaces, and they are available in terms of functionality, package size, reliability and cost.
To get the most accurate pressure readings, the sensor should be as close as possible to the medium to be tested. However, not all pressure sensors are compatible with liquid media, which poses a major problem for medical device designers. In many cases, they need to design additional components such as bypass or filters to solve the humidity problem, or to rethink the positioning of the components, especially in the system to avoid any fluid contact with the sensor. These tasks require additional design time and cost.
Anti-liquid, moisture-proof
Now, sensor manufacturers have developed board-mounted sensors. These sensors not only isolate liquid media and highly humid environments, they are suitable for medical devices with low to medium pressure measurement requirements, but also eliminate the need for designers to design additional protection features or redesign products (ensuring that fluids do not come into contact with the sensor), so Simplified design.
Image caption: Honeywell's TruStability pressure sensor offers a wide range of configuration options, reducing design and development time.
In chemical analyzers, pressure sensors require highly accurate and repeatable measurements at low pressures and need to withstand higher pressures during flushing and cleaning.
For example, liquid media compatible board mounted pressure sensors are a good choice for chemical analyzers. Because chemical analyzers require accurate measurements of liquid flowing through the system in a repetitive manner. In general, in a chemical analyzer, a pipette is required to pump a sample liquid, and then the sample is dropped into a sample bottle for mixing or analysis. During this process, the pressure sensor not only ensures accurate pumping of the required sample, but also detects whether the pipette is clear or whether the pipette is properly placed in the vial.
Pressure sensors must have high precision measurements and repeatable operation requirements when measuring in low pressure environments. At the same time, they are also able to withstand the higher pressures caused by flushing or cleaning the fluid path. All of this is premised on direct contact with the liquid medium to be tested.
Examples of such sensors include the 24PC/26PC board-mounted pressure sensors from Honeywell Sensing and Control, which detect small pressure changes between readings and accurately measure the flow through the system in a repeatable manner. Specific liquid flow ensures that the liquid has flow and flow rate data (this is the core point for the operation of the analytical equipment). In addition to being used as a pressure sensor for single-sided contact with liquid media, the differential sensor is also a unique solution for liquid media compatible with liquid media.
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