gasQS™ flonic

Assemble, configure, forget – the gasQS flonic can be tailored flexibly to your application and does not require any calibration or carrier gases.

gasQS flonic
gasQS flonic

Based on a microthermal CMOS sensor in combination with a critical nozzle and two valves, heat conductivity, heat capacity and the relative density of natural gas can be measured. From these parameters, the device correlates various output values.

The system has been developed completely by Mems AG. Thanks to the complex knowledge of the physics, the individual components and their interaction, customer-specific applications can be flexibly implemented.

  • Standalone device that does not require carrier gases
  • Setup of an additional automatic control measurement possible due to integrated control output
  • Additional output values can be added at any time in the current application
Suitable for high hydrogen content
Fast measurement
Easy to integrate
Individually adaptable


Natural gas networks

Gas indicators such as calorific value, density, real gas factors and hydrogen content can be determined with our measuring device. It also provides support in process monitoring.

Processing industry

The gasQS technology is also used in gas mixing processes. Production processes can thus be managed and at the same time the proportions of binary and ternary gases are determined.

Gas engines

Our measuring device increases the efficiency of gas engines: optimization of effectiveness, calorific value and methane number monitoring and lowering of the emission values.


Whether to determine the gas properties of boil-off, optimize effectiveness or reduce emissions on ships - our gasQS measuring devices can be used in diverse areas.


For the specifications, select the corresponding standard version below. Should the specifications not be suitable for your application, contact us.

How often should one perform a calibration check on the gasQS ™ flonic?

The gasQS flonic as a process instrument experiences wear from the conditions of the process in which it is installed. Temperature cycles, electronic component tolerance shift including the sensor chip and contamination build up over time on the sensor chip will all contribute to affecting the accuracy of the instrument. It should therefore regularly undergo, at a minimum, a calibration check if not a recalibration. But how often?

gasQS flonic does not have specified due dates for calibration. Mems AG designed the device from the very beginning in such a way that the above influences have the smallest possible effect on the long-term behavior of the sensor.

The inlet valve is protected by a double-mesh filter against the entry of dirt particles. A further filter shields the sonic nozzle from particles larger than its throat diameter. The chip sensor has passed its long-term test in several million passenger cars as a mass flow meter of the intake air, but also in household gas meters, over more than 6 years, no reduction in performance of the sensor could be detected. Due to the similar set-up as in the gas meter, no contamination of the chip, which would impair its function, is to be expected even in long-term operation with non-condensing gases. All electronic components meet the requirements of the strict standards of the automotive industry, so no premature aging effects should occur from this side either.

Mems suggests that gasQS flonic undergoes a calibration check once a year including a filter change at the device inlet. However, based on the application conditions, and perhaps company quality procedures, each customer must determine when they need to send in an instrument for recalibration.

The easiest way to check is with methane of the quality ≥99.5%. The measured values can be compared with those of the initial test in the "Calibration Documentation" supplied with the instrument. The values for "Lambda Ratio", "Pressure Ratio" and "Flow Ratio" output in the registers 0x0020 to 0x0025 or 0x7020 to 0x7025 should all display the value 1 within half a percent. If this is not possible, Mems is happy to take on this task for its customers.

We would be happy to provide you with a personal quote

Marco Siragna

Head of Sales gasQS

Phone: +41 (0)56 481 90 75

Marco Siragna
Marco Siragna

Explanatory video gasQS™ technology

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