Endress+Hauser Proline Prosonic B 200 ultrasonic biogas flowmeter

Endress+Hauser has introduced the Proline Prosonic B 200 ultrasonic flowmeter for measuring the flow rate and methane content of wet biogas, landfill or digester gas, and other types of low-pressure, wet or contaminated gas. The product uses transit time ultrasonic technology optimised for biogas applications.

The meter body has a 316 L stainless steel construction and is suitable for wet, dirty or corrosive gases. The product is available with either an aluminium or stainless steel transmitter housing. It has no moving or intrusive parts.

The product can measure and display direct methane fraction as a function of sound velocity and temperature, without the need for additional measuring instruments. Other possible outputs include corrected methane volume flow, energy flow, calorific value, temperature and Wobbe index. These measurements allow for improved process control and energy balancing. For example, a sudden change in the methane fraction indicates an upset in the process. The product can detect this change quickly, allowing corrections to be made.

This loop-powered two-wire device features 4-20 mA HART communication. A second 4-20 mA output is available. It operates in temperatures of 0-80°C and pressures up to 145 psi. Accuracy of volume flow is 1.5% of reading and accuracy of the optional methane measurement is 2% absolute. It is certified intrinsically safe for use in Class 1 Division 1 and other hazardous areas.

The product can be commissioned quickly via its four-line display and three push-buttons. Menu-guided parameter configuration is supported by explanatory text in 16 languages. It can also be configured with the company’s FieldCare software over the HART connection or via a local service interface and a laptop computer.

The HistoROM function provides storage for 1000 measured values, quick restoration of device data in case of failure and easy replacement of meter electronics without recalibration. The HistoROM also provides a user-defined data logging function, which logs data according to a recording interval set by the user.