Proven flow meters and flow measurement devices for compressed air and gas

Not sure which flow meter is right for your specific application? Then simply contact us in advance. As a leading supplier of flow meters and systems for consumption measurement, we will be happy to help you find the right system for measuring the flow of your compressed air or gas system and will make you a non-binding offer.

18 products

VA 500 - Flow meter for compressed air and gases

RS 485 interface, Modbus RTU, 4...20 mA analogue output for m³/h, Pulse output for m³.

VA 520 - Flowmeter with integrated measuring section

VA 520 - Thermal mass flow meter for flow measurement

for compressed air and gases. New digital electronics - improved accuracy.

DVGW approval and explosion protection with Ex or ATEX certificate

VA 550 - Thermal mass flow sensor for flow measurement

Insertion type sensor for demanding industrial applications, with ATEX approval for Ex zones or DVGW approval for use in natural gas.

VA 570 - Thermal mass flow meter with integrated measuring section and ATEX and DVGW approval

VA 570 - Thermal mass flow meter for consumption measurement

ATEX approval for hazardous areas and DVGW approval for use in natural gas.

VA 521 - Compact Inline flow meter for compressed air and other gas types

VA 521 - Compact Inline flow meter for compressed air and other gas types

The ideal device for energy monitoring, in compressed air and other gas systems, with many consumers.

VA 525 - Compact Inline flow meter

VA 525 - Compact Inline flow meter for compressed air and nitrogen

The ideal device for energy monitoring in compressed air or nitrogen with many consumers.

For pipes from ¾'' to 20''

VD 500 - Flow sensor for wet compressed air

For measuring immediately downstream of the compressor in moist air up to +180 °C


VD 520 - Inline flow meter

Measuring range 2 to 224 m/s / 600 m/s (Compressed air / gases) or 0.04 to 500 mbar differential pressure for Gases.

VU 570 - Vortex Ultrasonic Flow Sensor

VU 570 - Vortex ultrasonic sensor for flow measurement

For technical gases and mixed gases - independent of the gas composition



Measuring sections for precise measurements

Measuring section made of stainless steel 1.4301 incl. ball valve, up to DN 65 (R2 1/2") with external thread, from DN 80 with weld neck flange according to DIN 2633.

Spot drilling collars

Spot drilling collars

If there is no measuring site with 1/2" ball valve present it can be set up by means of spot drilling collars.


Drilling jig for set up a measuring site

By means of a special drilling device a measuring site with 1/2" ball valve can be easily set up within a few minutes.

High-pressure protection

High-pressure protection

The supplementary device "high-pressure protection" serves for a safe installation and fastening of the CS sensors VA 500 under pressure.

Thickness meter CS 0495

Thickness meter CS 0495

enables a quick, easy and accurate measurement of the wall thickness of pipes.


The products of CS INSTRUMENTS GmbH have been leading in the field of Consumption measurement and Flow measurement of Gases for years. Customers all over the world appreciate the professional support and development spirit behind our products. Through international subsidiaries and a constantly growing, worldwide sales and service network, we provide our customers with the latest Measuring technology and ensure optimum all-round support. For many applications, we offer specially developed and tried-and-tested systems for consumption and Flow measurement, which, in combination with our specially developed software solutions, are both uniquely effective and efficient.

Flow sensor VA550

For example, our VA550 (insertion version) and VA570 (version with integrated Measuring section) Flow sensors have been specially developed for harsh industrial applications. Thanks to the robust, impact-resistant die-cast aluminium housing, these flow sensors can be easily installed outdoors (IP65). ATEX or DVGW approval is also available on request.


All our Flow meters work according to the calorimetric principle and measure the thermal mass flow or Standarized volume flow directly. Additional Temperature and pressure compensation is not necessary. The standard volume is a common unit of volume measurement that is used to compare gas volumes at different pressures and temperatures. In order to fulfil various standards, the reference conditions can be set directly on the Display of all our sensors. The Flow meter thus provides the consumption directly in the set standard. While ISO 1217 (1000 mbar, 20 °C) is generally used in the compressed air sector, DIN1343 (1013 mbar, 0 °C) is used for Technical gases.

Is this all too complicated for you? No problem! We are sure to have the right device for your application. Simply contact us, we will be happy to advise you individually on your application and work with you to find the right device.

A factory calibration certificate is always included with our devices. ISO certificates, which are traceable to the national standard, are also available as an option. In contrast to many other measuring methods, the pressure loss caused by our flow measurement is negligible.

Each flow meter can be equipped with various interfaces to ensure connection to your control technology, Data loggers or evaluation devices. These include, for example, 4...20mA, pulse, Modbus RTU, M-Bus or Ethernet.

  • 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

Good to know

In addition to Flow measurement, our sensors can also be used to measure leakage quantities. This provides the user with information on possible energy savings. The insertion version is the ideal flow meter for existing compressed air and gas pipes and can be easily installed and removed under pressure via a ½" Ball valve. The flow sensor is available with different shaft lengths and can also be used in very large pipework > DN 1000 or rectangular ducts.