Bypass installation kit for the aeration sensor CGS
(Standard sensor only)
Installation of the standard sensor in a bypass
The standard sensor of the gas concentration system CGS can be used for measurement in the main flow for flow rates of up to 5 l / min. If your application has higher flow rates, we recommend to integrate the CGS sensor by creating a secondary branch (bypass) for your aeration measurement.
In order to set the conditions required for a correct measurement (flow 0.5 - 5 l/min), we offer a specially designed Bypass Installation Kit as an optional accessory for the standard sensor.
The Bypass Installation Kit
The Bypass Installation Kit is a 3-piece accessory kit designed to perform inline measurement of flowing gas-liquid-mixtures using the CGS standard sensor for 0.5 to 5 l / min.
The kit consists of a flow restrictor, a calming section and an electronically activated validation unit, and also includes all additional connections required (hose nozzles and screwed connections). Inlet and outlet of the bypass each have G3/8" thread.
In order to divert a measurable bypass flow from your mainstream (flow rate > 5 l/min, pressure > 5 bar), you should use a suitable flow restrictor.
This flow restrictor is installed on the pressure side, e.g. as a T- or Y-piece, and ensures that the resulting flow rate is well suited for taking measurements. The inlet of the flow restrictor has a G3/8" thread and can thus be easily integrated into your installation.
Calming section (expansion hose)
Since measurement in the CGS sensor requires the lowest possible pressures due to the compressibility of the gas portion, the flow restrictor limits your secondary flow to suitable, low flow rates.
After leaving the restrictor, the fluid-gas mixture expands and the following measurable phenomena occur:
- The entrained gas portions take on a larger volume in the two-phase current due to the pressure reduction.
- Potential gas fractions which were previously dissolved under high pressures are now undissolved.
While the first process occurs promptly (at the speed of sound), the second process is time-consuming. Our calming section ensures that there is enough time for the gas to be released before the fluid-gas mixture passes through the CGS sensor, thus ensuring that the gas contents in your fluid are measured correctly.
With the help of the electronically activated validation unit, the user can always make sure that the currently measured gas content values (CGp & CG0) are determined correctly and free of disturbing factors (for example, influences due to oil aging processes). The validation principle is based on the comparison of generated measured values with measured values under controlled compression.
The validation function is integrated in the firmware as well as in the PC software of the CGS.
Validation of the CGS is carried out automatically and can also be triggered manually either in stand-alone mode by pressing the menu button or by clicking the validation icon in the CGS software.
The validation function is based on the principles of gas-in-fluid behavior. The change of the gas content between p_min and p_max must fulfill the basic physical laws.
- If the measured values of the gas content at both pressure levels agree with the physical laws, then the measured CGp and Cg0 values are correct.
- If the two gas content values of the two pressure levels cannot be reconciled with the physical laws, then the measured values for CGp and CG0 are incorrect. An auto correction is performed.
This recurring check of the fluid parameters (generated during the calibration) ensures that aging / wear phenomena of the carrier fluid will not have an influence on the measurement.
Another advantage is that the user can check the reliability of the measured data by himself with a simple click at any point in time. The pressure variation may also be used to detect possible solubility phenomena.
The output of the validation unit corresponds to the end of the bypass and comes with a G3/8" connector.