Wafer-Style Flow Meters

The RWG and RWBG Series meters are wafer-style in-line flow meters designed to offer high accuracy measurements with extremely low pressure drop.

The meters have no moving parts and are virtually maintenance-free once installed. The RWG series is suitable for most gas types. The RWBG series is similar in construction but optimized for low-pressure “BioGas” applications, typically CH4 + CO2 mixtures. All meters in these series are loop-powered devices with standard HART® communications for ease of eld programming and system integration.

Features

• Low pressure drop
• NIST traceable calibration
• HART communication protocol 

Operating Principle

An everyday example of a vortex shedding phenomenon is a ag waving in the breeze: the ag waves due to the vortices shed by wind moving across the agpole. Within the flow meter as flowing media moves across the strut or “bluff bar,” vortices are also shed but on a smaller scale. The meter transmits an ultrasonic beam through the vortex pattern downstream of the strut. As vortices are shed the carrier wave of the ultrasonic signal modulates. The modulation of the carrier wave is measurable and proportional to the number of vortices shed. Digital processing enables the vortices to be counted, and this value is converted into a velocity. Software converts velocity into a volumetric flow rate, in units of measure selected by the operator.

Racine Vortex flow meters utilize the smallest strut in the industry, which allows for high levels of sensitivity; superior performance at low flow rates; high turndown ratios; and low pressure drop.

Through the use of an internal RTD and an external pressure sensor (optional),the flow meter software will compensate for changes in pressure and temperature, to achieve an accurate mass flow measurement.

Application Examples

• Combustion air
• Compressed air
• Incineration gas
• Natural gas
• Nitrogen
• Digester gas (BioGas: CH4 + CO2)
• Chemical processing

Industries

• Building Automation / HVAC
• Chemical, Refining & Petrochemical
• Oil & Gas
• Process or Industrial