February 2011Analytical Instrumentation & Environmental Monitoring
Bronkhorst High-Tech BV has upgraded its series of Mass-View flowmeters with three additional gases. Now the user can select one out of 10 pre-installed gases – Air, N2, O2, Ar, CO, CO2, N2O, CH4, C3H8 and C4H10, eliminating the need to recalibrate for different gases. Besides the selection of gases, the user can switch between four different flow ranges. The instruments are suitable for flow rates from 0,01 to 200 ln/min, offering an accuracy of ±2%RD if the flow is higher than 50% of full scale and ±1%RD plus ±0,5%FS on lower flows. The maximum operating pressure for the instruments is 10 bar.
The flowmeters distinguish themselves by their direct local readout with OLED (organic light emitting diode) technology, indicating the actual gas flow (in numerals and as bar graph), clearly visible free from parallax error. The display also shows gas type and totalised flow. As an option, the meter can be equipped with a needle valve for flow control duties. Mass-View was designed to mimic the straightforward features and vertical format of the VA meter, but with the added benefits of an electronic output signal, high measuring accuracy, virtual independence from gas temperature and pressure variations, and inherently safe construction with no fragile glass components in the flow path.
Power consumption is low and mechanical process connections are fitted for straightforward VA meter replacement. Alarm settings and the selection of preinstalled gases and flow ranges are accessed via a user-friendly menu, using a 4-way navigation button mounted on the front plate. An analogue output signal enables data-logging against various parameters and full accountability of gas flow, such as for shared ring main applications.
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