• KOBOLD Messring GmbH

Viscosity Compensation Flowmeter/Switch

Viscosity, which fluctuates as a function of temperature, is one of the main problems in the flow measurement and monitoring of oils or other viscous media. Inexpensive units, e.g., on the float principle, have up to now either had to be calibrated to a constant viscosity figure (which can seldom be guaranteed) or a relatively large error accepted (e.g., 2500% if the viscosity rises from 1 to 760 cSt and a flow rate of 0.1 per l/min). Kobold?s viscosity compensated flow and monitoring units work on the float principle with a measuring accuracy of 5% of the full-scale value for a viscosity change from 1 to 540 cSt. These type VKG units are fitted with a spring-loaded float, which in turn is guided in a cylindrical glass measuring tube and unlike previously known systems fitted with an orifice. Due to this and other design measures the company has succeeded for the first time in designing a low cost flow meter and monitor, which above all exhibits a complete viscosity and advanced density compensation even at the smallest flow rates. The installed position is optional, and possible without re-calibration of the scale. The instantaneous flow figures can be read off directly from the position of the float on the scale on the glass measuring tube, which at the same time allows a check (e.g. the colour) on the medium. For dark-coloured media, for which it is known to be difficult, a magnetically coupled pointer indicator can also be supplied. For the simultaneous monitoring of the flow, up to 2 volt-free bistable reed contacts can be used.