Using a pressure transmitter makes measuring pressure easy. However, how can we design and manufacture the perfect pressure transmitter? What is necessary to create an accurate and reliable measurement system? Our Technical Director, Bernhard Vetterli, explains. You can find the article through the related link below!

The pressure sensors produced by KELLER in Switzerland are the original products invented over 50 years ago by founder Hannes W. Keller. Each package bears our quality seal, proving that all delivered products are within the specified accuracy class. KELLER symbolizes high-precision measurement technology. In 1966, Hannes W. Keller (commonly known as HWK) was working at the Honeywell Research Center in Minneapolis, USA. There, he invented the integrated silicon measurement cell, a high-precision measuring element manufactured using semiconductor technology, in collaboration with A.R. Gias. This silicon measurement cell was already incorporated into Honeywell's process transmitters by 1971 and introduced to the American market. HWK brought this young invention back to Switzerland, developed the first high-precision static pressure transducer, and has been manufacturing it at the headquarters in Winterthur, Switzerland since 1974. On July 25, 1978, HWK's invention was officially patented (U.S. Patent No. 4103273). The patent number is also embedded in the quality seal. For more details about KELLER quality, please refer to the related links below!

KELLER has been supplying pressure sensors to various aircraft sectors since 1997. - Pressure control in the cabin - Hydraulic distributors and filters - Valve control - Fuel pumps - Refueling systems - Air conditioning systems - Ventilation - Emergency oxygen supply to pilots Approximately 40,000 KELLER sensors are in operation in the skies, with about 30,000 used for cabin pressure control. Accurate control of cabin pressure contributes to comfort, especially during takeoff and landing. Currently, all Airbus models and Boeing's 787 (Dreamliner) utilize KELLER's pressure measurement technology. The reliability has also been proven; for example, cabin pressure sensors are required to have 200,000 to 400,000 hours of error-free operating time, and one of our major customers confirmed over 1 million hours of MTBF during a year of observation. In addition to the detailed explanation above, you can also enjoy the following topics in the "Related Materials": 1. How safe is air travel now? 2. Where are the 10 types of KELLER pressure sensors used? 3. Delving into the secrets of the Airbus A380, Airbus A400M, and Boeing 787 (Dreamliner).

Keller's pressure sensors are also used in rockets that fly to the thermosphere! SSC (Swedish Space Corporation) is a global leading company that provides cutting-edge space engineering, satellites, and launch services. SSC's rocket, the Suborbital Express, flies to an altitude of 260 km in the thermosphere, conducting scientific experiments in a microgravity environment on behalf of research institutions and companies. The experiments are conducted in a microgravity state, after which the rocket falls back to Earth. After a helicopter retrieves the rocket, SSC evaluates and analyzes the collected data and shares it with the users. In this rocket launch, Keller's pressure sensor PAA-33X was incorporated into the experimental module "ARLES-II." Prior to this, in the summer of 2019, Keller's pressure sensors were also used for pressure monitoring in the experimental module "ARLES-I." Using the pressure sensors, the pressure within a series of experimental cells was monitored, where experiments involving droplets and graphene particles (graphene is considered a future material due to its tear resistance, high elasticity, and conductivity) were conducted. Keller sensors were also used to measure the gas pressure inside the nitrogen tanks on board!

The industrial, energy, and mobility markets are undergoing significant transformation, but at the same time, they face many challenges. Keller will contribute to solving these issues with pressure sensors! Challenge 1: Permeation → Gold-plated diaphragm Challenge 2: Hydrogen embrittlement → Special stainless steel with increased nickel content Challenge 3: Gas leakage → Metal seal connections Challenge 4: Intrinsic safety explosion protection → Obtaining ATEX and IECEx certification

The deeper you go into the ocean, the greater the pressure becomes. At the deepest part of the ocean (about 11,000 meters), the pressure is an astonishing 1,100 times that of the sea surface! The deepest fish discovered was found at a depth of 8,300 meters (in the Izu-Ogasawara Trench). How can fish survive in such high-pressure deep-sea environments? One reason is believed to be that they possess a special substance called TMAO (trimethylamine N-oxide) that helps them cope with pressure. TMAO plays a role in preventing proteins inside cells from being crushed by water pressure. However, there are things that TMAO cannot do. For that, check out the YouTube link below!

The unit of force, the newton, is named after the British physicist/mathematician Isaac Newton. However, he also invented something completely different. It is for cats... The answer is in the YouTube link below!

The basic principle of piezoresistive pressure measurement is the same as that of resistive pressure measurement, which captures changes in resistance. However, what are the advantages of using piezoresistive elements? This also explains not only the benefits of piezoresistive technology but also the aspects to be cautious about. Download materials from the related catalog!

Removing and capturing CO2 from the atmosphere in a practical and cost-effective manner is a challenging task, but we will introduce examples of manufacturers that are conducting research and development based on solar cell materials. They have successfully achieved CO2 capture at low power consumption and dramatically reduced CAPEX (capital expenditure) costs. This company has also significantly reduced energy consumption, realizing a cost-effective DAC technology. Why has Keller's high-precision pressure sensors come to be used in that process? We will reveal the secret! (Available for download from related catalogs)

You are likely familiar with the task of removing snow accumulated on cars or ice that has formed on windows. The same task is necessary for aircraft when it begins to snow or ice forms. The process of removing ice or snow from an aircraft is known as de-icing. De-icing is performed in specially designated de-icing areas and is scheduled just before the aircraft takes off. This is because ice and snow not only increase the weight of the aircraft but can also impair its aerodynamic characteristics. De-icing is carried out using a liquid that consists of at least 50% glycol mixed with water, and there are a total of four types of liquids that can be used for de-icing. At Amsterdam's Schiphol Airport, the mixture used for de-icing is stored in large heated tanks and is pumped into what is called "Safeaeros" before being used on the aircraft. Safeaeros is a type of spray vehicle specially developed for this purpose. At Schiphol Airport, four Safeaeros vehicles are used per aircraft (two in front of the main wings and two behind the tail). For more information, please refer to the related links below.

When selecting a pressure sensor, there is a type with a flush diaphragm structure. What are its advantages? Main features: 1. Suitable for measuring the pressure of viscous liquids such as ink. 2. Appropriate for applications where regular cleaning is desired. 3. Can be used in food processes if it has a clamp type. A typical pressure sensor has a screw at the tip, with a diaphragm (partition) that receives pressure located behind it. If the medium being measured is air, there is usually no problem with the standard structure. However, there are inquiries such as "I want to measure the pressure of ink" or "I need a structure suitable for cleaning since I regularly clean the pressure-receiving part," and in such cases, the standard structure does not allow for visibility of the interior, making it impossible to confirm whether it has been cleaned properly. In such cases, the pressure sensor with a flush diaphragm, where the pressure-receiving surface is exposed, proves effective. KELLER offers a wide range of products, including a minimum range of 30 kPa and an accuracy of 0.05% FS, with a wealth of experience. If you are interested, please feel free to consult with us.

Pressure Measurement Under Severe Conditions FPT Motorenforschung AG, headquartered in Albon, Switzerland, develops engines for vehicles and machinery in the powertrain division of CNH Industrial. Approximately 220 staff members are on-site developing new FPT products for commercial vehicles, construction machinery, agricultural machinery, and industrial and marine applications, with engines being tested on a total of 30 test benches. To measure engine efficiency, FPT Motorenforschung uses tools such as the M5 series pressure sensors from KELLER, a specialist in pressure sensors based in Switzerland. "The engines we develop and test in the factory meet the most stringent quality requirements in terms of materials, emissions, and efficiency. This means that when inspecting the engines on the test bench, we must consider all variables that affect the engine's performance. Therefore, precise measuring instruments are required to obtain accurate and reliable measurements, even under special conditions inside the engine," said the head of the Testing Engineering/Electronic Measurement Department at FPT Motorenforschung AG. For more information, please refer to the related links below.

On April 1, 2024, coinciding with the cherry blossom season, Keller Pressure Japan Co., Ltd. commenced operations as a subsidiary in Japan. The establishment of a subsidiary in Japan is a significant strategic step for Keller. The technical expertise and high-quality requirements in Japan, a technology-driven nation, perfectly align with Keller's high-quality standards for pressure sensors. We are very pleased to be able to support our customers in Japan locally going forward. Contact: sales.jp@keller-pressure.com