SonoQ GmbH
Sophie-Krämer-Str. 8
66386 St. Ingbert (Deutschland)
Tel: +49 6894 998980-90

Ultraschall-Durchflussmodul mit Diagnose-Mehrwert

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SonoQ's innovative and easy-to-integrate SQ-FM3 series flow modules provide access to the special diagnostic capabilities of ultrasound technology for the first time. In addition to precise flow measurement, the modules also provide information about the characteristic properties of the media. From this, important process parameters can be determined. These can be the temperature of the medium or changes in its composition. Here are some examples.
Sound velocity: The sound velocity is a powerful indicator for identifying or controlling liquids, as it depends mainly on the compressibility and density of the fluid, but also on the temperature. If, for example, many small air bubbles are present, the measured value will usually decrease due to scattering.
Fluid temperature: The dependence of the speed of sound on temperature is in most cases very similar in aqueous fluids as in pure water. This known dependence can be used to estimate the temperature of the fluid in a limited temperature range without the use of an additional thermosensor.
Flow direction: The amplitude of the received ultrasonic signals varies depending on whether the measurement is made with or against the flow direction. If these two values are very different, this usually indicates a high flow rate. If these values decrease under otherwise stationary conditions, there is possibly a defect, ageing in the system or contamination. If the viscosity of the fluid changes, the values will most likely decrease as well. Air bubbles may also have an influence due to scattering.
Minimum flow rates: At flow rates <0.3 l/min, the measuring accuracy decreases considerably. For this reason, a threshold value can be defined below which all measured values are set to zero by the system. However, if this threshold is deliberately set to zero, it is possible to detect even the smallest, but non-zero, flows. By adding other parameters such as sound velocity, signal strength depending on the flow direction, error status, etc., it is possible to make statements on the detection of leaks, empty pipes or even bubbles. Empty pipe detection is particularly helpful here - not only for status control, but also to define clear starting conditions.
The SQ-FM3 series is available in the sizes DN10, DN15 and DN20 and is constructed without moving parts. It is long-term stable and self-monitoring and also reacts to fast or pulsating flow changes. The compact and digital design enables cost-effective integration even for small and medium quantities, with the diagnostic functions providing added value for process monitoring. These sensors are used in cooling, solar or heating systems, among others.

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