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  3. KELLER Pressure Japan 日本支社
  4. Sudden and Instantaneous Pressure Rise in a Closed System: Underestimated Risks and Their Mitigation Methods
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  • May 16, 2025
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May 16, 2025

Sudden and Instantaneous Pressure Rise in a Closed System: Underestimated Risks and Their Mitigation Methods

KELLER Pressure Japan KELLER Pressure Japan 日本支社
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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Pressure Peaks in Closed Systems | KELLER Pressure

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21Y.jpg

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.

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23SY完成.jpg

Keller Company Pressure Sensor Series 23SY/25Y

Small pressure sensor with welded structure covering from 0 to 10 kPa up to 0 to 100 MPa!

The welded structure small pressure sensor 23SY/25Y is designed to meet the advanced and diverse requirements of industrial applications, including pressure range, pressure connection, output signal, and electrical connection (25Y features a flush diaphragm structure). The modular concept allows for high flexibility in specifications and enables quick response times. A temperature sensor is integrated into the circuit, correcting errors caused by temperature changes and contributing to improved overall accuracy. We can also offer intrinsically safe explosion-proof types 23SYEi and 25YEi. 【Features】 - Wide temperature compensation: ± 0.7 %FS @ -10 ~ 80℃ - Minimum pressure range starting from 10 kPa - Excellent long-term stability - Robust SUS housing - Option: Intrinsically safe explosion-proof type (23SY-Ei) 【Technology】 - Piezo-resistive pressure sensor - Welded structure without internal seals - Analog output: 4 ~ 20 mA, 0 ~ 5 V, 0 ~ 10 V, etc.

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33X完成.jpg

Keller Company Pressure Sensor Series 33X

High-precision pressure sensor with RS485 digital output. Atmospheric pressure range (800 to 1200 hPa) is also available!

The pressure sensor 33X achieves an extremely high accuracy of 0.05% full scale (FS) in the temperature range of 10 to 40°C through a mathematical correction method. An additional option for high precision of 0.01% FS is also available. In addition to a digital RS485 interface, analog current or voltage outputs can be obtained. 【Features】 - Accuracy of ±0.05% FS in the temperature range of 10 to 40°C - Standard dual outputs of digital RS485 and analog output - Analog output can be range-adjusted via digital RS485 - Available in barometric range type (800–1200 hPa) and differential pressure range type (from 0–30 kPa to 0–3 MPa) - Temperature range of -20 to 125°C (optional -40°C also available) - Excellent long-term stability 【Technology】 - Piezo-resistive pressure sensor - Correction technology using a mathematical model to produce accurate pressure values

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LEO2.jpg

Keller Company Digital Pressure Gauge LEO2 / LEO2 Ei

Digital pressure gauge with ±0.1% accuracy, explosion-proof type available, featuring Max/Min value display function.

The compact digital pressure gauge LEO2 offers high precision measurements at a reasonable price. The minimum/maximum values can be displayed simultaneously with the current pressure value, and multiple pressure units can be selected. It can be mounted in your desired position using a swivel adapter. The power supply uses a standard CR2430 battery (included). An intrinsically safe explosion-proof type is also available. 【Features】 〇 High precision: ±0.1%FS 〇 Various pressure units available (bar, mbar, hPa, kPa, MPa, PSI, kg/cm2) 〇 Zero point calibration via button 〇 Automatic shutdown 〇 Minimum/maximum value display 〇 Compact design 〇 Battery life up to 1000 hours 〇 Intrinsically safe explosion-proof type available (LEO2-Ei)

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LEO5.jpg

Keller Company High-Precision Digital Pressure Gauge LEO5

Digital pressure gauge with high precision ±0.05%FS and logging function.

The digital pressure gauge LEO5 consolidates the wide range of features of Keller pressure gauges into a waterproof stainless steel housing. It can detect pressure peaks at measurement intervals of ≥ 1 kHz and record all measurement values. Current measurements and stored data can be read via a USB connection. Pressure values are displayed clearly on a large display, with multiple units available for selection. Display settings can be pre-programmed or specified by the user. 【Features】 〇 High accuracy of ±0.05% FS 〇 Built-in piezoresistive pressure sensor 〇 Waterproof stainless housing and safety glass 〇 Excellent visibility with a 5-digit LCD display 〇 Rechargeable built-in battery (USB charging) 〇 License-free/free dedicated software 【Functions】 〇 High-resolution pressure measurement 〇 1 kHz peak detection function 〇 Data logger 〇 Capacitive touch keys 〇 Bar graph display 〇 Temperature display 〇 Minimum/maximum value display

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Related catalog(5)

Keller Company Ultra-Compact Pressure Sensor 21Y

Keller Company Ultra-Compact Pressure Sensor 21Y

PRODUCT
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Keller Company Small Pressure Sensor 23SY/25Y

Keller Company Small Pressure Sensor 23SY/25Y

PRODUCT
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Keller Company High-Precision Pressure Sensor 33X

Keller Company High-Precision Pressure Sensor 33X

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Keller Company Digital Pressure Gauge LEO2/LEO2 Ei

Keller Company Digital Pressure Gauge LEO2/LEO2 Ei

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Keller Company High-Precision Digital Pressure Gauge LEO5

Keller Company High-Precision Digital Pressure Gauge LEO5

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Fukuda's leak test, leak inspection, leak detection, leak test, integrity test.

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Fukuda Co., Ltd. has been pursuing leak detection for 60 years and is committed to advancing the future of leak testing. 【 Supporting Various Leak Tests: Air Leak Test / Gas Leak Test (Hydrogen Gas, Helium Gas) 】 We develop, manufacture, and sell leak testing equipment to inspect airtightness and sealing properties. We will propose the appropriate testers and devices for each inspection target. 【 Target Industries and Examples of Inspection Targets 】 - Automotive Industry: Engines, FC components, valves and piping, various parts - Electronic Components Industry: Smartphones, keyless switches, various small sensors - Pharmaceuticals / Food / Cosmetics Industry: Bottle containers, syringes, vials, eye drop containers, pillow packaging, PTP packaging We will propose the most suitable leak testers for each industry. 【 ISO Certification 】JIS Q 9001:2015 (ISO 9001:2015)

Jan 26, 2026

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[Video Manual Guide] We will clearly explain how to connect the wireless set that links the bed exit sensor and nurse call system through video!

  • NEW
  • OTHER

Hotron, which manufactures and sells sensors, provides bed exit sensors for hospitals, nursing, and care facilities. Hotron offers easy-to-understand video guidance on how to use the bed exit sensors wirelessly and how to set up device connections! ▼ Video Manual (YouTube) https://www.youtube.com/playlist?list=PLNVA4mTrZDqtJa6MfFRZQxwtfCSnAfxVy 【Bed Exit Sensors】 ○ Non-contact infrared sensor, simply place it - Pole-kun HB-H1 ○ Mat sensor, foldable thin mat - Mat-kun HB-UST ○ Body movement call - Ugo-kun HB-TV3 ○ Body movement call for wheelchairs - Ayumi-chan HB-WTV3 【Options】 ○ Nurse call linked wireless set - Wireless set (transmitter/receiver) HB-RS/HB-RJ ◎ For more information about the products, please contact us or download the catalog.

Jan 26, 2026

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■■ Air Leak Tester | FLA-0200 / FLA-0201 series ■■ Fukuda's new flagship model. Equipped with mastering correction function, it enables high-precision measurements in a short time.

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Fukuda's new flagship model. - Masterless type (FLA-0200 series) - General type (FLA-0201 series) Two models of air leak testers. With the mastering correction function, high-precision measurements can be achieved in a short time. Please take a look at the catalog.

Jan 26, 2026

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PFAS Regulation Countermeasures! ■■ Leak Test Equipment for Small Electronic Components|MSA-0101 series ■■ Does not use fluorinated inert fluids. PFAS-free. Offers accuracy equal to or better than liquid immersion testing.

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  • PRODUCT

● This is a leak testing device for small electronic components that does not use fluorinated inert liquids (PFAS-free). ● There is no longer a need for unstable visual confirmation through liquid immersion testing. It adopts a quantitative testing method that allows for stable pressure leak testing. ● It is a tabletop leak testing device specifically for gross leaks, with accuracy equal to or greater than that of liquid immersion testing. ● The detectable range is approximately 1×10⁻² Pa·m³/s to 1×10⁻⁶ Pa·m³/s (varies depending on the target product). ● It is suitable for sealed structures ranging from a few millimeters to a maximum of 80 × 70 mm. Please feel free to contact us for more information!

Jan 26, 2026

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【Metal Crack Repair】We repair cracks in metal products without applying heat.

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  • COMPANY

The "Mechanical Stitching Method" by Nichinichisui Road Machinery Co., Ltd. is a new technique that allows for the repair of metal cracks without the application of heat. By using special bolts and reinforcement plates, cracks are physically removed, and repairs are made without causing any thermal impact on the base material. Repairs can be carried out even in environments where open flames cannot be used. Since no heat is applied, the disassembly of equipment is minimized. ◎ For more details, please contact us. ◎ If a detailed technical explanation is needed, please contact us.

Jan 26, 2026

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  • 10個まで5日で出荷 ロータリーエンコーダ 9,500円~16,600円(税別) Φ30、Φ40mm 100~4000P/R 磁気式インクリメンタル形
  • 首都圏最大級の工業技術・製品の総合見本市 テクニカルショウヨコハマ2026 第47回 工業技術見本市 時代をひらく新たな技術 2026年2/4(水)・5(木)・6(金) 10:00-17:00 来場者募集中
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