Patented broadband continuous-wave technology used in an ultra-sonic flow meter promises low noise and reliable measurements, even in the most demanding applications.

By calculating velocity ratios between two or more ultrasonic paths, WIKA says that its simply constructed model FLC-UFL ultrasonic flow meter for custody transfer of gases provides reliable gas flow measurement.

Additional measured variables, such as sound velocity, signal-to-noise ratio or signal strength, are available for condition monitoring. For applications requiring integrated volume conversion, pressure and temperature sensors can be connected.

The flow meters are certified intrinsically safe for zone 0 in accordance with ATEX/IECEx and are designed for easy and quick installation and commissioning, with no special wiring requirements.

The epoxy-coated aluminium-alloy electronics case has an ingress protection of IP66 and NEMA 4X for outdoor use. For offshore applications, a version in stainless steel is available. The wetted parts are made from titanium and designed for process gas temperatures of -30 °C to 80 °C.

The model FLC-UFL features comprehensive flow and diagnostic information on the local display and remotely by means of a personal computer software interface, enabling real-time data logging and condition monitoring. The display shows an overview of the instrument's set parameters such as units, pipe size and ultrasonic path configuration. Traceability information, such as firmware version, checksums and serial numbers, is also displayed.

Special features include:

• Patented broadband continuous-wave technology
• Simultaneous transmission on two or more paths
• No pressure drop and no wear parts
• Intrinsically safe design
• Approved for custody transfer (MID MI-001, OIML R137-1 and -2)

The model FLC-UFL is supplied, as standard, with a pulse/frequency output and a USB port for commissioning and service. Option boards allow for an isolated RS485 and two additional isolated pulse/frequency outputs, and a 4-20 mA/HART output can be provided.