Coriolis flowmeter with Modbus interface

20 March 2012

Yokogawa has extended the communication capabilities of its ROTAMASS 3 Coriolis flowmeter series by adding a Modbus interface.

Modbus communications for the flowmeter, via an RS-485 connection, are available in both Modbus RTU and ASCII transmission modes.

The Modbus communication, at up to 57 kbit/sec, enables access to all relevant process measurements including, but not limited to, mass/flow, density and temperature. All measurement variables are included as readable address registers.

In addition to the Modbus communication, the standard I/O interfaces, such as 4-20 mA, pulse/frequency and status in/out, are still available for control and/or monitoring purposes.

A free ROTAMASS Modbus communication tool will be delivered with each ROTAMASS to allow for easy configuration of meter measurements and settings. Despite Modbus communication, all settings can be done by means of the indicator. Even simultaneous HART communication via HHT or FDT is possible.

The 'box in box' design of the flowmeter is said to guarantee decoupling of the device from external vibrations and stresses. With its two U-shaped and thick wall tubes, it can achieve an optimum measurement accuracy of ±0.1% of reading for liquids and ±0.5% for gases. The mass-flow measurement range of the ROTAMASS spans from 45 kg/h to 600 t/h. A unique density accuracy of ±0.0005 g/cm3 (±0.5 g/l) results from the real density being calibrated using different liquids and temperatures. ROTAMASS can handle applications involving temperatures from -200°C up to +350°C.

Every ROTAMASS model is available with a variety of process connections offering pressure rates up to 285 Bar.

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