Sika offers two new vortex flow meters in the VVX range adapted to measure liquid fluids from industrial processes such as heat pumps. These flow meters simultaneously measure the flow and temperature of the fluid and are available in several versions: brass or stainless steel body, DN32 diameter measuring tube for the VVX32 model or DN40 for the VVX40 with three types of output signals to choose from.
These robust construction flow meters are installed directly on the pipe to measure flows according to the Karman vortex principle. This measurement principle is based on the observation of a detachment of vortexes after an obstacle placed in a flow. The disruptive body immersed in the passing tube creates vortexes that are measured on either side by a piezo-electric sensor. This sensor is fully encapsulated by a resistant material envelope (ETFE Tefzel®) is not directly in contact with the medium. It offers a very high level of resistance to present particles and abrasion because some fluids can be charged or aggressive. The robustness of these flow meters is reinforced by the absence of moving mechanical elements and other wear parts.
The VVX32 and VVX40 speed meters have a measurement range of 12 to 250 l/min and 22 to 400 l/min, respectively. They offer ±2% accuracy of the measurement range and can withstand pressures of up to 16 bar. In addition to the flow measurement, they measure the temperature of the fluid flowing into the passing tube on a scale of 0 and 90 degrees Celsius.
Three options are proposed for the transmission and acquisition of measured values: frequency output, analog output (0.5 to 3.5V) and frequency output, analog output (0 to 10V or 4 to 20 mA) and frequency output.
These vortex-effect flow meters simply install on a pipe via their 11/2-ISO type 228 male to the male VVX32 and G 2-ISO 228 male (toric joints are provided). Their measurement characteristics, their high stability and their long duration of use have been qualified by numerous tests carried out by Sika's test laboratories.
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