Coming from a clinical background, em-tec’s technology is perfectly suited to the strict hygienic requirements of the pharmaceutical and bioprocessing sector. Whether for the laboratory environment or fully automated industrial bioprocesses, em-tec offer products and systems for the measurement of flow in flexible tubing with absolutely no product contact – thus eliminating the risk of cross contamination. The technology is perfect for use with today’s single-use systems and fluid paths and is compatible with most tubing types from 1/8″ OD up to 1 3/16″ OD.
The operating principle of the device is the ultrasonic transit-time method, the flow measurement is non-invasive, meaning without direct contact to the medium
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
- The evaluation of the received ultrasonic signals is based on the upstream and the downstream measuring section.
Consequently, the transit time difference is measured for every pulse. The difference between upstream and downstream measurements is proportional to the volumetric flow rate.