Keller Company High-Precision Differential Pressure Sensor Series PD-39X (39X-Ei)

The "TU Vienna Space Team," operated by students of the Vienna University of Technology, is working on the rocket project "Lamarr," which focuses on launching a liquid rocket using ethanol and liquid oxygen as propellants. The "Lamarr" rocket is equipped with pressure sensors from KELLER Pressure, specifically the PAA-23SY, PAA-21Y, and PD-39X series. These high-precision pressure sensors play a crucial role in ensuring the smooth progress of the mission. The pressure sensors measure the pressure in the pressurized tanks, fuel tanks, and combustion chamber of the rocket engine. The project team uses the measurement data supplied by the sensors to monitor and control various elements essential for stable flight. Pressure measurement technology in the aerospace field complies with the highest safety standards and has high demands for functionality. Therefore, in this field, highly specialized pressure measurement systems tailored to each customer are produced. For the "Lamarr" project, the KELLER Pressure standard specification piezoresistive pressure transmitters were selected. For more details, please follow the link below!

How do differential pressure sensors work, and how do they differ from other sensor types? Gauge pressure and absolute pressure sensors have defined reference points for measuring pressure differences (for absolute pressure: absolute vacuum; for gauge pressure: atmospheric pressure). In contrast, differential pressure sensors measure the difference between two pressures without defining a reference point. Differential pressure sensors can be constructed in various designs, one feature of KELLER Pressure's products is that there are types that can use liquid at both ports (e.g., model PD-33X). They can measure differential pressure with high resolution. There are also sensors that use two absolute pressure measurement cells to measure two pressures and calculate the differential pressure through electronic circuits (model PD-39X). This structure is particularly suitable for high-pressure applications. Typical applications of differential pressure sensors: 1. Flow measurement There are several methods for measuring flow, but one common method is differential pressure measurement through an orifice plate. 2. Level measurement of liquefied gas tanks Liquefaction reduces volume, allowing for transportation and storage. Why is differential pressure measurement suitable for this level measurement? For more details, please visit the URL below!

As attention focuses on hydrogen, which is considered a pillar of the future of energy, the importance of electrolyzers that decompose water into hydrogen is increasingly recognized. In a proton exchange membrane (PEM) electrolyzer, water enters one side of the device, and hydrogen passes through a permeable membrane to the opposite side due to the electric current, resulting in the decomposition of water into oxygen and hydrogen. Since hydrogen is often stored at high pressure after electrolysis, it is considered preferable to operate the electrolyzer at high pressure as well, as this can eliminate the need for additional compression processes. Therefore, it becomes necessary to control the pressure of the oxygen and hydrogen generated in the electrolyzer, and even if this can be achieved through back pressure control, it is essential to minimize the pressure difference between the two flows to avoid mechanical stress on the electrolyzer's membrane. For example, what should be done if the pressure difference between the oxygen side and the hydrogen side in a high-pressure electrolyzer is low, ranging from 1 to 10 kPa (which is the maximum pressure difference the membrane can handle)? What if a pressure measurement accuracy of <0.1% FS is required? This is where Keller's differential pressure sensor PD-39X comes into play. The PD-39X is equipped with two absolute pressure sensors, excels in pressure resistance on one side, and achieves an accuracy of 0.1% FS. For more details, please refer to the related links below!