Flow meters for air consumption monitoring in compressed air and gas

Not quite sure which flow meter is right for your specific application? Then simply get in touch with us beforehand. As a leading supplier of flow meters and air consumption monitoring systems, we’ll be happy to help you find the right flow measurement system for your compressed air or gas system and provide you with a no-obligation quote.

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VC 600 Clamp-on Flow Sensor

Clamp-on ultrasonic measurement for retrofit and temporary measurements, without opening the pipe. Quick clamp system for metal pipes: 25–90 mm outside diameter, from 3 bar gauge pressure; no upper pressure limit imposed by the sensor. Larger pipe diameters available on request.

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VA 526 – Compact flow sensor for compressed air and gases

Compact inline sensor for measuring volume flow, consumption and temperature on machinery and consumer equipment. With an optional flow straightener requiring no inlet section. Pressure and dew point measurement available as an option; easy set-up via Bluetooth and the CS SensorApp.

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CMM 500 – High-precision measurement of the compressor’s free air delivery

Venturi measuring section with flange for flow rate and reference measurements, available in nominal diameters from 25 to 200. Measures volume flow, pressure and temperature in humid, non-condensing or dry compressed air; industrial gases subject to specification.

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VA 500 - Flow meter for compressed air and gases

Insertion flow meters for existing pipework: nominal diameter 15 to 1000, depending on shaft length; larger diameters available on request. Pressure-rated versions up to 50 bar. Installation and removal under pressure via a ½-inch ball valve, either stationary or mobile. Integrated pressure measurement optional.

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VA 520 - Thermal mass flow meter for flow measurement

Calibrated unit comprising a flow sensor and measuring tube for distribution pipes and consumers: nominal diameter 8 to 80, threaded or with a flange. The sensor can be removed for cleaning or recalibration; the measuring section remains installed. Integrated pressure measurement is available as an option.

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VA 550 - Thermal mass flow sensor for flow measurement

Robust insertion flow meter for compressed air, industrial gases and fuel gases such as natural gas. Cleanable stainless steel sensor tip and aluminium housing. Pressure ratings up to 50 bar; special version up to 100 bar. Integrated pressure measurement and ATEX/IECEx or DVGW versions available as options.

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VA 570 - Thermal mass flow meter for consumption measurement

Robust thermal flow meter with a cleanable stainless steel sensor tip and integrated measuring section for stationary consumption measurement. Suitable for compressed air, industrial gases and fuel gases such as natural gas. Integrated pressure measurement and ATEX/IECEx or DVGW versions available as options.

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VD 500 - Flow sensor for wet compressed air

Differential pressure insertion type sensor for efficiency measurement and flow rate measurement in compressors, as well as for compressed air audits. Suitable for moist compressed air downstream of the water separator, dry compressed air and suitable gases; versions available up to 180 °C. Integrated pressure and temperature measurement.

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VD 520 - Inline flow meter

For stationary differential pressure flow measurement in moist compressed air and industrial gases. Flow, consumption, pressure and temperature in a single unit; the sensor head can be detached from the integrated measuring section for calibration.

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Accessories

Measuring sections for precise measurements

A measuring tube with a specified inner diameter, suitable inlet and outlet sections, and a ball valve for the insertion type sensor.

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Hot tapping saddles

Retrofit a point of measurement to an existing pipe: Hot tapping saddle including ball valve for outside diameters of 32–335 mm, suitable for the pipe material and operating pressure. Other sizes available on request.

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Drilling device incl. drill for setting up a point of measurement

Tap into the prepared points of measurement via the ball valve in the correct manner under pressure – without interrupting production.

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High-pressure protection

Additional safety measure for the installation and removal of suitable insertion type sensors at gauge pressures of 10 bar or more.

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Thickness meter CS 0495

Measure the pipe wall thickness and use the outside diameter to determine the inner diameter – to ensure the flow measurement is correctly specified.

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Drilling jig for set up a measuring site

This Drilling jig can be used to set up a measuring site after welding on a 1/2" threaded socket and then installing a 1/2" Ball valve.

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What makes our consumption measurement systems stand out?

CS INSTRUMENTS GmbH’s products have been at the forefront of gas consumption measurement and flow measurement for many years. Customers all over the world value the professional support and innovative spirit that underpin 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 all-round support. For a wide range of applications, we offer specially developed and tried-and-tested systems for consumption and flow measurement, which, when combined with our specially developed software solutions, are both uniquely effective and efficient.

What makes our measurement systems so flexible and reliable for different types of gas?

A factory calibration certificate is always included with our instruments. ISO certificates, which are traceable to the National Standard, are also available as an option. Unlike many other measurement methods, the pressure loss caused by our flow measurement is negligible.

Each flow meter can be fitted with various interfaces, ensuring connection to your control systems, chart recorders or analysis units. These include, for example, 4–20 mA, pulse, Modbus RTU, M-Bus and Ethernet.

Which gases are covered?

  • Air / Compressed air
  • Carbon dioxide (CO2)
  • Nitrous oxide (N2O)
  • Nitrogen (N2)
  • Oxygen (O2)
  • Propane (C3H8)
  • Argon (Ar)
  • Hydrogen (H2)
  • Natural gas / biogas
  • Helium (He)
  • Methane (CH₄)
  • Vacuum

An example: VA550 flow sensor

OurVA550 (insertion type) and VA570 (version with integrated measuring section)flow sensors have been developed specifically for harsh industrial environments. Thanks to their robust, impact-resistant die-cast aluminium housing, these flow sensors can, amongst other things, be installed outdoors (IP65) without any problems. We can also provide ATEX approval or DVGW approval on request.

What is the most suitable measuring principle for your application?

Our volumetric flow sensors operate on various physical measuring principles, thereby enabling the precise measurement of volumetric flow rate, mass flow rate and standard volumetric flow rate for a wide range of gas applications. Each measuring principle offers specific advantages, providing the optimum solution for different requirements:

  • Thermal mass flow metres (VA series): The VA series utilises the calorimetric principle, in which a heated sensor measures the heat loss in the gas flow to perform the calculation of the mass flow rate directly. 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 from 0.1 m/s. Ideal for detecting minute leaks in pressurised pipes or gas pipelines, right up to high-speed applications at 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 a calculation of the flow rate. In addition to conventional 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 utilises unique, specialised differential pressure sensors that deliver accurate measurement results from as low as 2 m/s. The turndown ratio is 1:130, making the VD series ideal for low, medium and high flow velocities, high pressures, and applications involving gas mixtures, hydrogen, CO₂ and compressed air with humidity or wet compressed air. The VD series is characterised by high accuracy (< 0.5 per cent 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 utilise 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, enabling the mass flow rate or standard volumetric flow rate to be calculated directly. This allows for simple installation in the pipeline without the need for an external flow calculator.

Standard volume and customisable reference conditions

Standard volume is a unit of volume measurement that enables the comparison of gas volumes at different pressures and temperatures. On all our sensors, the reference conditions can be flexibly set via 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 reading.

Good to know

As well as flow measurement, our sensors can also be used to measure leakage rates. This provides users with insights into potential energy savings. The insertion-type sensor is the ideal flow meter for existing compressed air and gas pipework and can be easily fitted and removed whilst under pressure using a ½” ball valve. The flow sensor is available with various shaft lengths and can also be installed in very large pipes (> nominal diameter 1000 mm) or rectangular ducts.