HOME PRODUCTS MARKETS SUPPORT DOWNLOAD LIBRARY COMPANY CONTACT NEWS DEUTSCH ALL RESULTS PRODUCTS DOCUMENTS NEWS EM-TEC PRODUCTS TECHNOLOGY Technology Through the operating principle of the ultrasonic transit time method, our flow measurement is non-invasive, meaning without direct contact to the medium em-tec's non-invasive flow measurement method is based on the ultrasonic transit time method. This method determines the transit time difference of ultrasound signals through a measuring section and is used to evaluate volumetric flow rates. A typical transit time flow measurement system incorporates two piezo ceramics that act as both ultrasonic transmitter and receiver. The flow measurement is conducted by sending ultrasonic pulses from one ceramic to the other (i.e. with and against the flow direction) and by measuring the transit time difference that it takes for the pulse to travel between them. For a higher accuracy, our Clamp-On Transducers incorporate two pairs of sound transducers. They consist of four piezo ceramics and are arranged in an X configuration around the tube containing the measured flow. When sending ultrasonic sound signals through the measuring section, the transit time difference depends on the flow direction of the medium: If the ultrasonic sound signals are sent along the flow direction, the downstream signal needs less time If the ultrasonic sound signals are sent against the flow direction, the upstream signal needs more time Consequently, the transit time difference is measured for every pulse. The difference between upstream and downstream measurements is proportional to the volumetric flow rate. The picture on the left shows the transmitting impulses and the resulting received signals. Through the difference in the received signals, the transit time difference can be determined. Since the difference in transit time is very slight (picoseconds), the calculation is done with a multi-step correlation method. With an increasing flow, the transit time difference of the received signals increases as well. By adjusting the sensor, it is possible to convert the transit time difference into a volumetric flow. PSG BRANDS Abaque All-Flo Almatec Blackmer Ebsray em-tec EnviroGear Griswold Hydro Systems Mouvex Neptune Quantex Quattroflow Wilden EM-TEC PRODUCTS Medical Sensor Systems BioProcessing Sensor Systems Engineering Technology EM-TEC MARKETS Medical BioProcessing SUPPORT DOWNLOAD LIBRARY COMPANY CONTACT NEWS GET IN TOUCH em-tec GmbH Lerchenberg 20 86923 Finning Germany +49 8806 9236 0 em-tec-info@psgdover.com em-tec on LinkedIn EMAIL UPDATES SUBSCRIBE © 2021 PSG. All Rights Reserved. TRANSPARENCY DISCLOSURE PRIVACY POLICY CODE OF CONDUCT We are using cookies to give you the best experience on our website. For more information, please see our privacy policy. ACCEPT