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. Whether it's oil aeration in engines or gear boxes, foamed adhesives or aerated food products: Our CGS is the perfect tool for almost every gas-in-fluid problem.


Key features

  • Continuous displaying of the aeration / concentration of undissolved gas in fluids
  • Inline-measurement without any mechanically moving parts
  • Suitable for all electrically non-conductive 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 easily be integrated into any fluid circuit. Due to its continuous inline measurement of the volumetric gas concentration, the system offers new possibilities, e.g. for the continuous monitoring of oil aeration in 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 addition 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, gear boxes and turbochargers
  • 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 and other screw-on adapters available)



In general, the CGS 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 standard sensor (left picture) are equipped with UNF 9/16 (dash 6) connectors which simplify the mounting of the measuring instrument into the fluid circut. The standard sensor is suitable for main stream installation with 0,5 - 5 l/min. If your application has higher flow rates, we recommend bypass installation with the optional bypass installation kit. However, if main stream measurement is preferred, there are larger sensors available as well.


There are different types of electronic units / housings available: as alternatives to the aluminum desktop housing (bottom left) with separable LEMO connectors, we offer a compact small housing for mobile use (bottom center), as well as a large plastic housing with terminals (bottom right) which is designed for control cabinet installation.

CGS Standard, Mobile & Large Box


Fast or superfast measurement?

Once you have decided which sensor and electronics may be best for your application, there is one more thing to figure out: Would you like to measure at standard speed - once per second - or at high-speed - ten times as fast?

With a measuring time of only 100 ms, the CGS in high-speed version might come in handy if you have a dynamic application with unsteady or inhomogenuous aeration.


Operating your CGS

No matter the type of sensor or electronics, or if it's a standard or a high-speed version. Every CGS system for the determination of gas concentration in fluids can be used in stand-alone mode or can be operated with your WINDOWS computer via standard interface RS 232. In addition, each CGS comes with powerful software that enables you to trace and interpret your measurements.

If you prefer controlling your data with your master computer, you can simply use the analog output of the CGS (0-10 V or 4-20 mA) to transfer the measured live data of all relevant parameters.


Technical data of the CGS

Measuring range0 to 100 Vol. % Gas
Accuracyapprox. +/- o.1 Vol. % Gas
Measuring media & Flow rates

electronically non-conductive fluids

for flow rates < 5 l/min: use standard sensor

for higher rates: use bypass installation or large sensor

customized sensor tubes for main stream installation also available upon request

Measuring time

Standard: 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 (WxHxL)

Standard sensor: 40 x 110 x 165 mm;

Large sensor: 60 x 127 x 218 mm

custom-made sizes available upon request

Material measuring tubespecial steel (1.4571)

Standard sensor: 2x UNF 9/16″-18Gg (dash-6) male

screw-on adapters (G 3/8" or others) available upon request;

Large sensor: 2x G1" female;

Dimension electronic unit (WxHxD)

Standard (Aluminum): 235 x 150 x 370 mm

Large (with connecting terminal): 330 x 150 x 300 mm

Compact (for mobile applications): 240 x 95 x 115 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

Contact us

You are interested in our aeration sensor CGS or have any questions?
Please contact us today and we´ll be happy to help.


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Fluid aeration measurement with flucon