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Theory

Thermal mass flow measurement

Thermal mass flow measurement

Thermal Mass Flow Meters and Controllers make use of the heat conductivity of fluids (gases or liquids) to determine mass flow.

Coriolis mass flow measuring principle

Coriolis mass flow measuring principle

A Mass Flow Meter operating on the "Coriolis principle" contains a vibrating tube in which a fluid flow causes changes in frequency, phase shift or amplitude, proportional to the mass flow.

Ultrasonic flow metering principle

Ultrasonic flow metering principle

The operation of Bronkhorst® ES-FLOW flow meters is based on the propagation of ultrasound waves inside a very small sensor tube.

Videos

Pressure measurement

Pressure measurement

The Bronkhorst High-Tech EL-PRESS pressure sensor is a piezo resistive bridge on the surface of a silicon chip.

Mass flow controller theory

Mass flow controller (MFC) theory

In the case of mass flow control, the output signal is continuously compared with a setpoint signal from a voltage source. Any deviations between setpoint signal and measured signal are translated into a solenoid control valve adjustment until the two signals are identical.

Vapour control

Theory and advantages of 'CEM' Vapour Control

The vapour generation system consists of a liquid flow controller, an MFC for carrier gas, a temperature Controlled-Evaporation-Mixing device (CEM) and a power supply / readout / control unit.

Volume Flow versus Mass Flow

Volume Flow versus Mass Flow

The ranges of Bronkhorst's thermal mass flow meters / controllers for gases are specified in such units as ln/min, sccm or m3n/h. These units look like volumetric units, but in truth they are expressions of Mass Flow. What is the story behind this?

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