Sika offers two new VVX series vortex flowmeters for measuring liquid media in industrial processes such as heat pumps. These flowmeters simultaneously measure the flow rate and the temperature of the fluid and are available in several versions: brass or stainless steel body, measuring tube diameter DN32 for the VVX32 or DN40 for the VVX40 with a choice of three output signals.
These robustly built flowmeters are installed directly on the pipe to measure flows according to the Karman vortex principle. This measuring principle is based on the observation of a vortex detachment after an obstacle placed in a flow. The disturbing body immersed in the flow tube creates vortices which are measured on both sides by a piezoelectric sensor. This sensor is entirely encapsulated in a resistant material (ETFE Tefzel®) and is not in direct contact with the medium. It offers a very high level of resistance to the particles present and to abrasion due to the fact that some fluids may be charged or aggressive. The robustness of these flowmeters is enhanced by the absence of moving mechanical parts and other wearing parts.
The VVX32 and VVX40 flowmeters have a measuring range of 12 to 250 l/min and 22 to 400 l/min respectively. They offer an accuracy of ±2 % of the measuring range and support pressures up to 16 bar. In addition to flow measurement, they measure the temperature of the fluid flowing through the flow tube on a scale of 0 and 90°C.
Three options are available for the transmission and acquisition of measured values: frequency output, analog output (0.5 to 3.5 V) and frequency output, analog output (0 to 10 V or 4 to 20 mA) and frequency output.
These vortex flowmeters are simply installed in a pipe via their G 1½-ISO 228 male fitting for the VVX32 and G 2-ISO 228 male fitting (O-rings are supplied). Their measurement characteristics, high stability and long service life have been qualified by numerous tests performed by Sika's testing laboratories.
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