Pressure sensor compatible with liquid media improves the design of medical devices
At present, there are many kinds of sensors on the market, which are dazzling. But for medical system OEMs, choosing the best pressure sensor for medical devices in liquid-induced or condensing wet applications is no easy task. Designers need to choose a sensor that strikes a good balance between technical functionality, reliability, and specific application cost.
Designers of medical devices have historically had little choice for applications that require liquid media compatibility. Before liquid-compatible board-mounted sensors were introduced, the only choice for designers was the media-isolated pressure sensor. Nowadays, when dealing with higher pressures (eg, pressures above 150 psi), we still choose media-isolated pressure sensors; for lower pressures, these sensors are too large compared to board-mounted sensors. The price is too expensive.
If the application environment is an intermediate strength pressure and the sensor must be in contact with liquid or humid gas in a Class C application, what is the best choice?
Class C applications include gas/liquid chromatography, chemical analyzers, and blood diagnostic equipment. The key requirement for these devices is to accurately measure the pressure of reagents, samples, and cleaning solutions. Board-mounted pressure sensors are preferred based on a given pressure range (typically below 150 psi) and size limits.
Designers often choose to place the sensor as close as possible to the medium to be tested in order to get the most accurate reading. However, if the pressure sensor is not compatible with the liquid to be tested, this can cause serious problems for medical device designers, forcing them to add protection to the sensor. In many cases, these additional components can significantly increase the design time and cost of the medical device.
Even in diagnostic applications where the fluid typically does not touch the sensor, the designer still needs to consider the worst-case scenario, such as an overpressure in the application or a flow of liquid in the tube that exceeds a preset value and touches the sensor.
What does the designer do to ensure that the sensor is isolated from the fluid? This involves the design of the piping, so they need to consider the positioning of the components in the system to isolate the fluid from the sensor, or add additional components such as filters to the design to solve the humidity problem.
To simplify designers' efforts to select the right pressure sensor for medical devices, sensor manufacturers have developed targeted solutions. These solutions not only isolate the liquid medium, but also eliminate the need for integrated additional protection, simplifying the design effort by eliminating the need for the engineer to ensure that the liquid does not come into contact with the sensor.
A chemical analyzer is a very convincing application example in which a liquid-media compatible board-mounted pressure sensor is used. In a chemical analyzer, a sample pipe is used to pump a sample liquid, and then the sample is dropped into a sample bottle for mixing or analysis. At this point, it should be judged whether the pipette is unblocked or placed correctly in the sample bottle to ensure the correct amount of liquid, and this requires the use of a pressure sensor.
The most basic requirement in the application of chemical analyzers is to accurately measure the specific amount of liquid flowing through the system in a repeatable manner. Therefore, the pressure sensor must have high precision and repeatability, be able to handle low pressure work requirements, and be able to withstand flushing. Or higher pressure generated by cleaning the liquid passage.
Honeywell Sensing and Control's 24PC/26PC board-mounted pressure sensor delivers high resolution and repeatability, detects small pressure changes and provides readings, and accurately measures flow in a repeatable manner The specific amount of liquid through the system ensures that the liquid has a flow rate and flow rate (this is a central point for the operation of the analytical equipment).
In addition, Honeywell's 24PC/26PC sensor is a unique solution for applications requiring differential pressure sensors to contact liquids.
In ventilator applications, pressure sensors are used to measure the patient's inhaled and exhaled airflow, so high-stability and high-accuracy measurement requirements are required to accurately measure air and oxygen pressures beyond setpoints. Honeywell's HSC/SSCTruStability sensors are extremely rigorous and can detect pressures as low as 250Pa (1 inch water column), making them perfect for this application. In addition, the sensor supports I2C or SPI digital outputs that interface directly with the microprocessor and microcontroller, simplifying design and improving performance.
Honeywell's TruStability pressure sensor family is available in a wide range of configurations, making design and development easy.
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