The designers applied transit time ultrasonic technology, which has been proven in wet, dirty refinery flare gas applications for almost thirty years, improved it and optimized it for biogas applications.
The meter body has a 316L stainless steel construction and is suitable for wet, dirty or corrosive gases. The flowmeter is available with either an aluminium or stainless steel transmitter housing. With no moving or intrusive parts, the B200 solves operational reliability problems that are typical of other technologies in wet and dirty biogas applications.
It can also 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 B 200 can detect this change quickly, allowing corrections to be made.
The unit operates in temperatures of 32 to 176 ºF 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.
The instrument is a loop-powered two-wire device with 4-20mA HART communication. A second 4-20 mA output is available. The flow meter is certified intrinsically safe for use in Class 1 Division 1 and other hazardous areas. It has ATEX, IEC and cCSAus approvals, and NEMA 4X, IP66 and IP67 protection. It also has pressure equipment directive approval (PED).
Calibration and Setup
Each B 200 is tested and calibrated before shipment on an ISO/IEC 17025 accredited calibration rig. The calibration facilities are traceable to national and international standards.
It can be commissioned quickly via its four-line display and three pushbuttons. Menu-guided parameter configuration is supported by explanatory text in 16 languages. It can also be configured with Endress+Hauser’s FieldCare software over the HART connection, or via a local service interface and a laptop computer.
Automatic data backup is provided by the HistoROM function which provides storage for 1,000 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.
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