Clamp-On Flow Meter
Clamp-on flow meters are a type of ultrasonic flow meter. They are also known as “non-intrusive” or “non-invasive” flow meters because they do not come in direct contact with the fluid flow they are measuring. Instead, they are attached, or clamped on, to the outside of the pipe.
Typically, clamp-on flow meters come in single and dual-sensor versions. To make the former, manufacturers plant piezoelectric transmit and receive crystals in the same sensor body. To connect the sensor to the pipe, manufacturers use a coupling compound. The latter version, on the other hand, features the transmit crystal in one sensor body, with the receive crystal in the other.
Once clamped on, the flow meter sensor(s) send and receive ultrasonic pulses. This information is collected and sent to a readout for interpretation. Usually, this is a digital readout, but it can also have relay outputs, analog outputs, binary + RTD inputs, or a combination therein.Read More…