Differential Pressure Measuring Instruments  Manufacturers, Traders, Suppliers

Pressure sensors (also known as pressure cans, pressure load cells or pressure transmitters) differ, apart from the design and the output signal, mainly in the type of reference pressure for pressure measurement: here there are pressure sensors for relative pressure, absolute pressure and differential pressure transducers.
In a pressure sensor for relative pressure, the back of the sensor element is exposed to the air pressure surrounding us. In a typical setup, a small tube leads from the back of the sensor to the plug or through the connection cable. These pressure sensors have the advantage that fluctuations in air pressure are not reflected in a fluctuation of the output signal.
The pressure sensor for absolute pressure has a small chamber on the back of the sensor membrane which is completely evacuated, i.e. the chamber is 0 bar absolute. These pressure sensors show the current air pressure, which is typically between 950 and 1050 mbar, as long as no measuring pressure is present. Changes in air pressure (e.g. due to a rising high or low) therefore lead to a change in the measuring signal without changing the actual pressure value. A special type of absolute pressure sensors are barometers, which measure the ambient air pressure very precisely. A special form of the pressure sensor is the so called sealed gauge version. Here, the reference chamber is sealed tightly at approx. 1000 mbar. These pressure sensors are mainly used for measuring ranges >10 bar. Closing the reference chamber prevents, for example, aggressive gases from entering the reference chamber and causing corrosion.
Another special form of pressure sensors are so-called differential pressure sensors or pressure transducers. Here the back of the sensor membrane is mechanically constructed in such a way that it can be used as an independent pressure connection for pressure measurement. A pressure sensor (pressure cell or pressure load cell) in this version therefore indicates zero at the same pressure on the input and reference sides. Differential pressure sensors differ substantially in their mechanical construction. Here there are simple designs which, for example, only allow dry gases for the reference side or also high-quality pressure transmitters which allow an overload (even on one side) of more than 200 bar at a small nominal measuring range of 35 mbar.
Pressure transmitters often have a very robust mechanical design and have a 4...20 mA output signal which is common in process measurement technology.

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halstrup-walcher GmbH is a medium-sized company, which has been in family-ownership ever since it was founded in 1946. CEO Jürgen Walcher looks back at the impressive rise of his company. "The focus of our products has changed significantly since those early days, but the precision and innovative power of our solutions have remained a constant factor."
halstrup-walcher GmbH successfully manufactures and markets products in three business areas: positioning systems for automated format changeover in mechanical engineering applications, pressure measuring technology for cleanroom, air-conditioning and OEM applications as well as drive solutions based on spur gears and actuators. The approx. 160 employees develop and manufacture both standard and customer-specific solutions. The level of in-house production is remarkable. halstrup-walcher`s strong quality assurance programme and lean processes have made it a highly professional partner offering impressive performance in terms of quality, costs and punctuality.

Trafag is a leading international supplier of high quality sensors and monitoring instruments for measuring pressure (i.e. pressure transmitters, pressure sensors and pressure switches, pressostats), temperature (thermostats and temperature transmitters) and SF6 gas density (SF6 gas density monitors and SF6 gas density sensors). A wide range of standardized, configurable products is available. Trafag is also specialized in developing tailored-made solutions for OEM-clients.
Trafag, a Swiss based company founded in 1942, is supported by a broad net of subsidiaries and representatives in over 40 countries all over the world. This allows Trafag to offer customers an individual and competent advisory service. High-performance development and production departments guarantee not just the timely delivery of our products with highest quality and precision, but also ensure that customer-specific requirements are met to absolute satisfaction.
"Trafag products: https://www.trafag.com/en/products
Brochures: https://www.trafag.com/en/supportservice/brochures-catalogue
Catalogues: https://www.trafag.com/en/supportservice/products-catalogue
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Trafag - Innovation, Reliability, Quality
Trafag is a leading international supplier of high quality sensors and monitoring instruments for measuring pressure (i.e. pressure transmitters, pressure sensors and pressure switches, pressostats), temperature (thermostats and temperature transmitters) and SF6 gas density (SF6 gas density monitors and SF6 gas density sensors). A wide range of standardized, configurable products is available. Trafag is also specialized in developing tailored-made solutions for OEM-clients.
Trafag, a Swiss based company founded in 1942, is supported by a broad net of subsidiaries and representatives in over 40 countries all over the world. This allows Trafag to offer customers an individual and competent advisory service. High-performance development and production departments guarantee not just the timely delivery of our products with highest quality and precision, but also ensure that customer-specific requirements are met to absolute satisfaction.
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KROHNE is a global manufacturer and provider of instrumentation, measurement solutions and services. Founded in 1921 and headquartered in Duisburg, Germany, we offer extensive application knowledge and local contacts for instrumentation projects in over 100 countries. KROHNE stands for innovation and high quality products as one of the market leaders in the process industry.
KROHNE specializes in process measurement – from field instrumentation to system solutions – and is a full-service provider for flow, level, pressure, temperature and process analytics products, accompanied by a broad range of services. We have proven experience working with many customers across most industries, including but not limited to chemical, oil & gas, food & beverage, water & wastewater, power generation and distribution, marine, as well as mechanical and plant engineering.
Today, KROHNE employs more than 4,000 people, operates 15 production facilities and owns 44 companies worldwide while remaining an independent, family-owned company. Our aim is to provide the right measurement solutions for our customers’ process measurement applications. We achieve this by manufacturing innovative, reliable, high-quality products and services, employing qualified and motivated people and maintaining long-term, reliable partnerships with our business partners.