Flow Measurement & Control


Mass flow measurement of gases

April 2018 Flow Measurement & Control

Kobold offers the type MAS mass flowmeter that works according to the calorimetric method of measurement and was specially conceived for gas flow measurement. Since gases can be compressed, the volume changes with pressure and temperature. In practice this means that calibration should be done for a particular working pressure and temperature. This conversion is not needed with the MAS electronic mass flowmeter because only the mass flow of the gas is determined by measuring the heat transfer.

The gas is led through a sophisticated, laminar flow bypass that gives it a laminar stream. Due to the pressure difference that arises, a small quantity of gas branches off into the measuring pipe. With laminar flow, the distribution ratios of both gas quantities remain constant. This is important for the calculation of the flow volume. There are two temperature measuring points (RTD elements) in the measuring tube arranged in sequence (one behind the other). The gas flowing through is subjected to a constant amount of heat. The gas molecules absorb that heat and carry it away. This creates a temperature difference between the sensors that increases with the amount of gas that flows through. The temperature difference creates a resistance difference in the RTD elements. It is now only necessary to convert the temperature difference into the standard mass flow. A state-of-the-art electronic 180° rotating LCD display shows the corresponding volume flow in standard units per minute. The digital display makes it virtually impossible to make a reading error.

The low heat capacity of the measuring tube and the low mass of the auxiliary flow guarantees users a fast response time. Since pressure and temperature changes have only a small effect on the measurement, the mass flowmeter can be used within a large pressure and temperature range without need for adjustment. The standard equipment includes an analog output so that readings can be continuously processed further. Another advantage of the MAS is the large measuring range in different steps of 0-10 Nml/min up to 0-500 Nl/min. The MAS has small dimensions and can be used in any position.

Typical applications are in process control, laboratories, gas display tables, OEM applications, leakage rate testing, filter monitoring and gas flow calibration. The sophisticated measuring procedure and modern electronics make the MAS suitable for a wide range of applications and greatly simplify the measuring of gas flow.


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