Concentration Gas System CGS

The Concentration Gas System CGS to measure fluid aeration

Aeration measurement has never been so easy.

The core element of our CGS (Concentration Gas System) is a measuring tube without any mechanically moving parts. The determination of the gas concentration is based on an innovative procedure which, in contrast to the radionuclide method, does not come with any security issues. The CGS measures the change of the complex fluid impedance in comparison to the unaerated medium and offers decisive advantages in all fields of application concerning the gas concentration (e.g. oil aeration in engines and gear boxes, foamed adhesives, aerated food products, etc.).

Key features

  • Continuous displaying of the aeration / concentration of undissolved gas in fluids
  • Inline-measurement without any mechanically moving parts
  • Suitable for all types of liquids
  • Non-destructive measurement, independent of the direction of flow
  • Integrated temperature and pressure measurement
  • Retroactive accounting of the equivalent gas content at atmospheric pressure
  • High degree of accuracy
  • Short measuring time & simple handling
  • Compact, portable measuring instrument
  • Standard digital interface (RS 232, adaptable to USB) for an optional connection to your PC (Software included)
  • Analog output for all measured parameters

Fields of application

The standard measuring tube of the CGS is equipped with UNF 9/16 (dash-6) connectors* and can be easily integtrated into any fluid circuit. Due to its continuous inline measuring of the volumetric gas concentration, the system offers new possibilities, e.g. for the continuous monitoring of the oil aeration of combustion engines and gear boxes, or for the optimized application of aerated adhesives. The CGS can furthermore be applied as a regulation and control unit in all areas of technical production in which the concentration of gas represents an important quality feature, or in areas in which the systematic adding of gas can reduce production costs. The following fields of application summarize the features of the CGS:

  • Inline live data
    New criteria for the design of motors and gear boxes
  • Optimizing of machines and machine parts
    New machine elements with reduced oil aeration
  • Optimizing of fluid development
    Fluids with better gas content behaviour
  • Process survey and control
    Process optimizing in the application of aerated adhesives

(* 3/8" male or other adapters available)


The CGS system for the determination of the gas content in fluids consists of only two components: the measuring tube with three integrated sensors (CG-sensor, PT100-temperature sensor and pressure sensor) on the one hand, and the corresponding control and evaluating system in an electronic unit on the other hand. Both ends of the measuring tube are equipped with dash 6 connectors which simplify the mounting of the measuring instrument into the fluid circut. The CGS system for the determination of gas concentration in fluids can be used in the stand-alone mode or can be operated with any computer via the standard interface RS 232. In addition, each CGS system comes with powerful software that enables you to trace and interpret your measurements.

  Technical data

Measuring range0 to 100 Vol. % Gas
Accuracyapprox. +/- o.1 Vol. % Gas
Measuring media fluids

recommended flow rate: < 5 l/min, use bypass-installation for higher rates; bigger/custom-made sensor tubes for mainstream installation also available upon request

Measuring time approx. 1 s,

high-speed version (measuring time approx. 100 ms) available upon request

Temperature measurementPT 100, +/- 0.1 °C
Temperature range-30°C to 150°C
Pressure rangemax. 10 bar
Dimensions measuring tube (LxWxH)165 x 40 x 40 mm (incl. pressure sensor), custom-made sizes available upon request
Material measuring tubespecial steel (1.4571)
Connection UNF 9/16″-18Gg (dash-6) – external thread on both ends of the measuring tube,

custom-made connection (G 3/8" or others) available upon request

Dimension electronic unit (L x W x H)330 x 290 x 145 mm
Data communication (computer)RS 232 interface (CGS software for WINDOWS included)
Analog output temperature4-20 mA / 0-10 V
Analog output CGp-signal4-20 mA / 0-10 V
Analog output CG0-signal4-20 mA / 0-10 V
Analog output pressure4-20 mA / 0-10 V
Power supply110-240 VAC or 9-36 VDC


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