Comprehensive Explanation of pressure scanners
Learn about pressure scanners with KETU&TEST in one article.
Ⅰ. What is a pressure scanner?
Pressure is ubiquitous in daily life. Whether it's the wind blowing in your face on your way to work or the contact between your hands and the water flow while washing your hands, "fluid pressure" is present in all of these. From the pipe pressure ensuring a smooth flow of tap water to the tire pressure affecting driving safety and fuel consumption in cars, and the gas pipeline pressure ensuring home safety, monitoring these pressures is crucial for the normal and safe operation of systems. This need for pressure monitoring is amplified and even more stringent in the industrial sector. For example, in aerospace, energy, and chemical industries, even minute deviations in fluid pressure can affect equipment performance, product quality, and even personnel safety.
pressure scanners are specialized instruments designed to meet the needs of efficient, multi-point fluid pressure measurement in industry. They can simultaneously measure pressure data from dozens or even hundreds of points, greatly improving testing efficiency. pressure scanners can be classified in many ways. Based on the measured medium, they can be divided into gas pressure scanners and liquid pressure scanners; and based on the type of pressure measured, they can be divided into gauge pressure type, absolute pressure type, and differential pressure type. Therefore, before selecting a pressure scanner, it is essential to understand the specific testing requirements.
Ⅱ. Working principle of a pressure scanner.
To understand the working principle of a pressure scanner, one can start with its core structure. A typical pressure scanner's housing is made of high-strength, corrosion-resistant metal. Its internal core components mainly include multiple high-precision pressure sensors, a data acquisition board, signal conditioning circuitry, and an analog-to-digital converter. Each sensor typically corresponds to a measurement channel. By drilling holes in the measured component or using tools such as probes, the pressure at each measurement point is guided to the corresponding input port of the pressure scanner through pressure tubes. Under the precise timing control of the central processing unit, the pressure from all input channels is converted into a weak electrical signal. After amplification, filtering, and conditioning, the signal is converted into a digital value by the acquisition system. The data from all channels is then recorded sequentially and transmitted in real-time to the host computer software via a communication interface for data display and analysis.
Generally speaking, silicon piezoresistive pressure sensors are the optimal choice for the sensor core of pressure scanners due to their wide pressure measurement range, good stability and sensitivity, and fast transient response.
Ⅲ. Application areas of pressure scanners.
Pressure scanners, with their multi-point and efficient measurement capabilities, are widely used in various critical fields. Here, we'll start with pressure types to understand the applications of pressure scanners in different fields.
Different application scenarios require measuring different types of pressure, mainly including absolute pressure, gauge pressure, and differential pressure. Simply put, absolute pressure is the pressure value relative to a complete vacuum, suitable for closed systems or scenarios where absolute physical pressure needs to be known; gauge pressure is the pressure value relative to local atmospheric pressure, and is the most common reading found in everyday instruments; differential pressure is the pressure difference between two measurement points, often used to measure flow rate, liquid level, or filter clogging. These measurement modes play a core role in many applications.
1. Aerospace and Wind Tunnel Testing: This is a classic application area for pressure scanners. In wind tunnel tests of aircraft and rocket models, hundreds of pressure measurement holes need to be densely arranged on the model surface. pressure scanners simultaneously measure the pressure at these points. The pressure difference between the model surface and the free flow (i.e., differential pressure) is the direct basis for calculating aerodynamic lift and drag; while the gauge pressure data relative to the static pressure of the test section is used to accurately plot the surface pressure distribution cloud map of the entire machine or component, providing core data for aerodynamic shape optimization. Pressure monitoring in the high-temperature combustion passages inside engines also often requires measuring absolute pressure to analyze combustion efficiency.
2. Energy and Process Industries: In the oil and gas industry, pressure scanners are used to monitor the absolute pressure of downhole fluids, which is crucial for assessing reservoir conditions. In pipeline transportation, real-time flow is calculated by measuring the differential pressure before and after the throttling device. Meanwhile, the pressure in storage tanks is often monitored as gauge pressure to ensure safety. In the power industry, it can be used to measure the pressure distribution (mostly gauge pressure or differential pressure) along gas turbines and steam pipelines to evaluate system performance and safety.
3. Automotive Engineering: In engine development, pressure scanners are used to simultaneously measure transient pressures at multiple points, including the intake manifold, cylinders, and exhaust manifold. Intake pressure is typically measured as absolute or gauge pressure to analyze charging efficiency; combustion chamber pressure is measured as absolute pressure to study the combustion process; and exhaust back pressure is mostly monitored using gauge pressure. In vehicle aerodynamics testing, measuring the differential pressure between the vehicle body surface and the atmospheric environment is a core method for optimizing styling to reduce wind resistance.
4. HVAC and Fluid Machinery: When evaluating the performance of fluid machinery such as fans, compressors, and pumps, it is necessary to simultaneously measure the differential pressure between their inlet and outlet to calculate the pressure head, as well as the static pressure at multiple cross-sections, to plot a complete performance curve. In building ventilation and environmental wind field studies, it is used to measure the static pressure within ventilation ducts and the differential pressure between the building surface and the indoor/outdoor environment to optimize ventilation efficiency and structural safety.
5.Biomedical and Scientific Research: In the testing of medical devices such as ventilators and anesthesia machines, precise monitoring of airway pressure, typically gauge or differential pressure, is required to ensure patient safety. In hemodialysis equipment, monitoring the differential pressure between the blood circuit and the dialysate circuit is crucial. In fundamental research fields such as microfluidics and hydrodynamics, pressure scanners are used to measure the subtle differential pressure distribution in complex flow fields such as microchannels and experimental water tanks, revealing the nature of flow.
Ⅳ. Performance characteristics of pressure scanners
With increasing demand, a large number of pressure scanner brands have emerged in the market, with varying models and parameters. Here, we take the KTPS-16A pressure scanner from Ketu Measurement & Control as an example to analyze some of its performance characteristics.
1.High-Precision Measurement: pressure scanners are high-precision instruments, and accuracy is a core performance indicator that directly affects the reliability of measurement data. The KTPS-16A pressure scanner achieves an accuracy of ±0.05% FS. Here, "FS" is an abbreviation for full-scale, and "±0.05% FS" represents the accuracy of the device at a certain full-scale range, i.e., the percentage of measurement error relative to the full-scale range. According to national standards, the accuracy levels of industrial instruments in my country are divided into multiple levels. ±0.05%FS corresponds to level 0.05, which is a high-precision level suitable for scenarios with extremely high data accuracy requirements.
2.High-Speed Sampling Capability: This refers to the "sampling rate" in the equipment's technical parameters, which indicates the number of pressure measurements performed on a single channel per second, typically measured in Hertz (Hz). Currently, most pressure scanners on the market have a sampling rate of 500Hz-1000Hz, while the KTPS-16A pressure scanner can achieve a sampling rate of up to 10kHz, adjustable from 0-10kHz. For complex systems with high-frequency changes, it can accurately capture instantaneous pressure fluctuations.
3. Multi-channel synchronous acquisition: This refers to all channels within the device acquiring data simultaneously. Through TCP/IP networks, NTP protocols, and clock synchronization technology, it ensures that the internal clocks of multiple devices are highly consistent when working together in a network, thus achieving strict time alignment of channel data across devices. This is an essential function for building large-scale distributed testing systems.
Ⅴ. pressure scanner and supporting software.
The software ecosystem is an integral part of the performance of pressure scanners. It displays the pressure data collected by the device in real time, forming a complete solution from configuration and data acquisition to analysis together with the pressure scanner.
For example，the KTPS-16A pressure scanner of KETU&TEST, its accompanying KetuSoft professional data acquisition software is 100% independently developed by KETU&TEST. It not only supports real-time data display but also possesses powerful analysis and processing capabilities. Below are some of its functions:
1. Data Waveform: Displays the trend of data changes over time for each channel. This function supports not only single-device data display but also the creation of waveform graphs showing correlations between data from multiple devices.
2. Secondary Calculation: Supports secondary calculation and analysis of data from different channels and allows simulation of device status through virtual devices, facilitating user testing and operation.
3. Panel Monitoring: A visual interface for real-time data monitoring and management. Dynamic monitoring of the device can be achieved by setting upper and lower alarm values for each channel.
4. Data Analysis: Through time and frequency domain analysis, it enables multi-dimensional interpretation of data and supports the selection and customization of various filtering algorithms to effectively remove high-frequency noise and sudden interference from signals, achieving more accurate judgments.
5. Data Gallery: It combines data with real-world scene diagrams for multi-dimensional display and analysis, optimizing the decision-making process.
6. Data Storage and Export: It supports exporting data with timestamps to various common file formats including CSV, Excel, Access, Matlab, and UFF.
Ⅵ.Selection and manufacturer recommendations for pressure scanners.
In the face of a complex and diverse pressure scanner market, selecting the right equipment has become a significant challenge for users.
First, it's crucial to clearly define the specific testing requirements. Key considerations include the measurement medium, measurement range, accuracy requirements, sampling requirements, functional compatibility, connector type, and communication protocol. Furthermore, because domestic research on pressure scanners started relatively late and early technological accumulation was weak, many users may have favored well-known foreign models when selecting equipment. However, with changes in the international situation, trade patterns, and national support for independent technological innovation, domestic scanning valve manufacturers have increased their R&D efforts and gradually caught up, offering strong competitiveness in localized services and cost-effectiveness. Against this backdrop, KETU&TEST, leveraging its own strength, has independently developed its pressure scanner products, from hardware and software to product structure design and process optimization. It not only provides flexible customized designs but also offers superior product performance and comprehensive service support, which has gained widespread recognition within the industry.
Ⅶ.Develop trends and future prospects of pressure scanners.
With the continuous improvement of industrial automation and intelligence, the technology of pressure scanners is also constantly advancing. Future pressure scanners will develop towards higher precision, stronger anti-interference capabilities, and greater intelligence. Especially driven by big data and the Industrial Internet, pressure scanners will be deeply integrated with automated monitoring systems, becoming part of intelligent manufacturing. KETU&TEST will continue to research and develop breakthroughs in industry technology barriers, expanding the potential and competitiveness of pressure scanners in advanced manufacturing.
