Flow Meters for Air Consumption Monitoring in Compressed Air and Gas

For years, CS INSTRUMENTS GmbH’s products have been leaders in the field of gas consumption measurement and flow measurement. Customers around the world appreciate the professional support and innovative spirit behind our products. Through our international subsidiaries and a steadily growing global sales and service network, we provide our customers with the latest measuring technology and ensure optimal, comprehensive support. For a wide range of applications, we offer specially developed and time-tested systems for consumption and flow measurement, which, when combined with our custom-designed software solutions, are uniquely effective and efficient.

Our volumetric flow sensors operate on various physical measuring principles, enabling the precise measurement of volumetric flow rate, mass flow rate, and standard volumetric flow rate for numerous gas applications. Each measuring principle offers specific advantages to provide the optimal solution for different requirements:

• Thermal Mass Flow Meters (VA Series): The VA Series uses the calorimetric principle, in which a heated sensor measures the heat loss in the gas flow to directly perform the calculation of the mass flow rate. This type of sensor offers high accuracy at both very low and high volumetric flow rates, without the need for additional pressure and temperature compensation. Calorimetric flow meters can precisely measure even the lowest flow velocities starting at 0.1 m/s. Ideal for detecting minute leaks in pressure lines or gas pipelines, as well as for high-speed applications up to 223 m/s, in accordance with ISO 1217.
• Differential Pressure Sensors (VD Series): The VD Series measures the pressure drop across a measuring orifice in the flow path and uses this to perform the calculation of the flow rate. In addition to traditional insertion sensors, Venturi technology is also available here, in which a special Venturi tube is used for precise measurements at high flow rates. CS INSTRUMENTS uses unique, specialized differential pressure sensors that deliver accurate measurement results starting at just 2 m/s. The turndown ratio is 1:130, making the VD Series ideal for low, medium, and high flow velocities, high pressures, as well as applications involving gas mixtures, hydrogen, CO₂, and humid or wet compressed air. The VD Series is characterized by high accuracy (< 0.5% of the measured value) across an extremely wide measuring range and is used as a reference instrument
• Vortex Flow Meters (VU and VX Series): The VU and VX series vortex flow meters utilize the vortex shedding principle for precise volumetric flow measurement and are ideal for high flow velocities, gas mixtures, steam, and high pressures. The measuring principle is independent of pressure and temperature, which ensures additional stability.

The vortex flow sensors (VU and VX) and the differential pressure sensors (VD series) are equipped with integrated temperature and pressure measurement, allowing the mass flow rate or standard volumetric flow rate to be calculated directly. This allows for easy installation in the pipeline without the need for an external flow calculator.

Standard volume and customizable reference conditions

Standard volume is a unit of volume that allows for the comparison of gas quantities at different pressures and temperatures. For all our sensors, the reference conditions can be flexibly set on the graphic display to show standard volumetric flow rates in accordance with common standards (ISO 1217 for compressed air and DIN 1343 for industrial gases). This ensures a reliable, standards-compliant consumption display.