- 1 - 4th edition SS2-MVC320-0100 OVERVIEW The steam flow meter STEAMcube is designed exclusively to measure saturated steam. Because steam conditions change greatly according to the effects of pressure and temperature, steam flow measurement involves a number of difficulties. STEAMcube measures differential pressure, which is used to measure flow rates, and steam pressure, to calculate steam density from a built-in steam table, and generates a mass flow rate of steam based on these measurements and calculations. This measurement scheme enables STEAMcube to make accurate steam flow rate measurements under the changing conditions. China RoHS This device is used in the Oil & Gas, Petrochemical, Chemical, Pulp & Paper, Food & Beverage, Machinery, Steel/Metal & Mining, and Automobile industries and therefore does not fall under the China RoHS Legislation. If this device is used in semiconductor manufacturing equipment, labeling on the device and documents for the China RoHS may be required. If such documents are required, consult an Azbil Corp. representative. FEATURES Dealing with changing steam flow conditions by measuring mass flow rates . Because steam conditions change greatly due to the effects of pressure and temperature, it is very difficult to make accurate steam flow rate measurements. If a flow rate is measured based on the volume of steam passing through a flow meter, a considerable measurement error occurs due to the effects of changing steam conditions (expansion and contraction occur frequently). To measure a fluid such as steam, a flow rate should be measured based on a mass flow rate instead of the volume of steam passing through a flow meter because a mass flow rate remains unchanged even under changing pressure and temperature conditions. . STEAMcube, equipped with dual sensors, measures pressure and differential pressure simultaneously and separately. By collating these measured pressure values with data in a built-in steam table, STEAMcube is able to calculate the temperature and density of saturated steam. It is also able to calculate a mass flow rate based on the temperature and density values. Generating analog and pulse outputs simultaneously STEAMcube can generate both analog and pulse outputs simultaneously. Using the pulse output, totalized flow rates can be counted with a level of accuracy higher than that of analog integration executed by DCS. Therefore, the pulse output is suitable for custody transfer applications. On the other hand, the analog output can be configured to output instantaneous flow rates or to selectively output either pressure or temperature measurements. By leveraging this feature of STEAMcube, it is possible to decrease the number of pressure transmitters by one. Covering low-velocity regions by producing an uninterrupted output . A vortex flow meter measures steam flow rates by counting the number of vortexes occurring downstream of a vortex shedder bar in a measurement pipe. Vortexes do not occur stably in a low-velocity state, and this leads to a loss of output, which is acknowledged as a problem to be solved. Steam Flow Meter STEAMcube Model MVC32A (Remote Type) Model MVC33A (RemoteType for large flow) 4 18 Specifications are subject to change without notice. “This product is designed for general industrial use.”