Keller Company High-Precision Differential Pressure Sensor Series PD-39X (39X-Ei)
High-precision differential pressure sensor using two absolute pressure sensors - Excellent pressure resistance on one side!
The differential pressure sensor series PD-39X is a high-precision model that indirectly measures differential pressure using two absolute pressure sensors and boasts high pressure resistance performance. In addition to a digital output (RS485), it comes standard with two outputs: analog current or voltage output. The analog output can be freely scaled within the line pressure range based on the settings of the digital signal. There is also an intrinsically safe explosion-proof type available (PD-39X-Ei).
basic information
Pressure range: 0 to 0.3 to 0 to 3.5 MPa Accuracy: ± 0.05 %FS @ room temperature Overall accuracy: ± 0.1 %FS @ -10 to 80 °C Line pressure: 0 to 0.3 to 0 to 3.5 MPa Output: RS485, 4 to 20 mA, 0 to 10 V Features: Line pressure measurement function *Software CCS30 The license-free software CCS30 is used for configuration and recording measurement values. Measurement - Real-time graphic display - Adjustable measurement and saving intervals - Export function - Connection to bus systems - Up to 100 measurements per second Configuration - Information retrieval (pressure and temperature range, software version, serial number, etc.) - Zero and span recalibration - Analog output rescaling (units, pressure range) - Low-pass filter adjustment - Selection of instrument address and baud rate
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Differential pressure measurement
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Differential Pressure Measurement in Industrial Applications - A Detailed Look at the World of Differential Pressure Measurement
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!
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Why is a high-precision differential pressure sensor necessary for hydrogen production through electrolysis? It is related to back pressure control under high pressure!
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!
