Keller Company Pressure Sensor Series 21Y
Ultra-compact pressure sensor with a minimum diameter of 17mm, covering from 0 to 200kPa up to 0 to 100MPa!
The pressure sensor series 21Y features a welded structure that does not use internal seals. It has an insulation voltage of 300VDC, making it less susceptible to disturbances. A temperature sensor is integrated into the circuit to correct output errors caused by temperature changes, resulting in improved overall accuracy and TEB. 【Features】 • Wide range of temperature compensation • Ultra-compact, ideal for applications with limited installation space • Robust SUS housing • Excellent long-term stability 【Technology】 • Piezo-resistive pressure sensor • Welded structure without internal seals • Compact with analog output: 4–20mA, 0–10V, etc.
basic information
Pressure range: 0 to 200 kPa to 0 to 100 MPa Accuracy: ± 0.5 %FS Overall accuracy: ± 1.5 %FS @ -10 to 80 °C Output: 4 to 20 mA, 0 to 10 V, 0.5 to 4.5 V Temperature range: -40 to 100 °C
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Small-scale use
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Pressure sensors monitor liquid propulsion rockets!
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!
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KELLER will exhibit at the International Space Business Expo SPEXA! July 30 to August 1, 2025, at Tokyo Big Sight, South Hall 3, S4-2.
KELLER Pressure is a leading manufacturer of piezoresistive pressure sensors. We are showcasing high-precision pressure sensors, compact pressure sensors, and high-speed response pressure sensors, including pressure sensors and digital pressure gauges with proven performance in the aerospace and aviation fields. We will explain why KELLER Pressure products are chosen in the aerospace and aviation sectors and what sets them apart from competitors using our displayed products. 【Example of Achievements】 Rocket (fuel, oxidizer), satellites (atmospheric pressure measurement during atmospheric entry), combustion pressure measurement, aircraft attitude control, detonation, International Space Station (ISS), etc. For those wishing to have meetings or product introductions at our booth on the day of the event, we are accepting reservations in advance. If you are interested, please contact sales.jp@keller-pressure.com. 【Exhibition Content】 We offer a variety of pressure sensors suitable for a wide range of measurements: - Low pressure to high pressure (0.5 kPa to 200 MPa) - Low temperature to ultra-high temperature (-50°C to 1000°C) - High precision (± 0.01% FS and above) - Compact (Φ 1.4 x 3.1 cm and above) - Ultra-fast response - Digital display pressure gauges
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KELLER will exhibit at the International Space Business Expo SPEXA! July 30 to August 1, 2025, at Tokyo Big Sight, South Hall 3, S4-2.
KELLER Pressure is a leading manufacturer of piezoresistive pressure sensors. We will showcase high-precision pressure sensors, compact pressure sensors, and fast-response pressure sensors with the specifications listed below, focusing on pressure sensors and digital pressure gauges that have a proven track record in the aerospace and aviation fields. We will explain why KELLER Pressure products are chosen in the aerospace and aviation sectors and what sets them apart from other companies using the displayed products. [Example of Achievements] Rockets (fuel, oxidizer), satellites (atmospheric pressure measurement during re-entry), combustion pressure measurement, aircraft attitude control, detonation, International Space Station (ISS), etc. For those who wish to have meetings or product introductions at our booth on the day of the event, we are accepting reservations in advance. If you are interested, please contact sales.jp@keller-pressure.com. [Exhibition Content] We offer a variety of pressure sensors suitable for a wide range of measurements: - Low pressure to high pressure (0.5 kPa to 200 MPa) - Low temperature to ultra-high temperature (-50°C to 1000°C) - High precision (± 0.01% FS and above) - Compact (Φ 1.4 x 3.1 cm and above) - Ultra-fast response - Digital display pressure gauges
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KELLER pressure sensors with a strong track record in the aerospace field!
KELLER Pressure has been supplying pressure sensors to a wide range of sectors in the aerospace industry since 1997, and its pressure measurement technology has proven its reliability over hundreds of thousands of hours of flight. Reliability is paramount in the aerospace field, and the products used have proven themselves in this regard. 【Example of Achievements: Space Sector】 - Rockets (fuel, oxidizer) - Satellites (barometric measurement during atmospheric entry) - Combustion pressure measurement - Aircraft attitude control - Detonation - International Space Station (ISS) 【Example of Achievements: Aviation Sector】 - Pressure control in the cabin - Hydraulic distributors and filters - Valve control - Fuel pumps - Refueling systems - Air conditioning systems - Ventilation - Emergency oxygen supply to pilots You can see how different each application is and how broad the demands for pressure measurement technology are. Custom solutions are possible, but KELLER's strength lies in its many achievements with standard catalog products. This significantly improves parts procurement and management, costs, and delivery times. Please feel free to consult with KELLER, which has strong expertise in the aerospace field!
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Sudden and Instantaneous Pressure Rise in a Closed System: Underestimated Risks and Their Mitigation Methods
Pressure peaks in closed systems can cause significant damage and are complex phenomena. But what exactly is a pressure peak? How does it occur, and how can we protect the system from pressure peaks? We will explain the role of precise measurements in ensuring the safety and efficiency of pressure systems. 1. What is a pressure peak? Why does it occur? The physical principles behind the phenomenon are Newton's three laws of motion and Bernoulli's principle. What causes water hammer and cavitation, and what are their effects? 2. Preventive measures Using simulations, protective components such as pressure dampers, pressure reducers, and check valves, as well as pressure sensors. 3. Why are pressure sensors necessary to protect the system from pressure peaks? Continuous monitoring with sensors allows for real-time recording of pressure peaks and can trigger automatic responses such as valve opening and closing. In the event of a failure of system components or protective devices, it can not only be directly detected but also prevented. Alarms can be automatically sent to responsible personnel via email, IoT, cloud, etc., in case of anomalies. For more details, please refer to the related links below!
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Our company is the Japanese branch of KELLER Pressure (Switzerland). Since its establishment, KELLER Pressure has developed and produced all its products at its factory in Winterthur, Switzerland, and is a leading manufacturer of pressure transducers and pressure transmitters, certified with ISO 9001. As a core business, we manufacture and sell over 1.3 million pressure measurement cells annually, offering products with pressure ranges from 5 mbar (500 Pa) to 2000 bar (200 MPa). With the extensive experience gained from all our products, our solutions can cater to a variety of applications. We are highly regarded as a manufacturer of high-precision pressure sensors and also accommodate OEM and custom products. We have received positive feedback from many customers. Contact: sales.jp@keller-pressure.com
















































