FLOW SWITCHES

General description The KSR flow switches are used to display and monitor the flow of liquid and gaseous media e.g. in cooling systems and cooling circuits on welding machinery, laser and cathode ray equipment, dosing systems, pumps, compressors, hydraulic systems, high pressure plant and many more. Measuring principle The KSR flow switches operate on the suspended body measurement principle. A suspended body is guided in a cylindrical slotted nozzle. A reed contact is fitted outside the flow circuit. The reed contact is cast into a smoothly adjustable housing (switch housing) and thus protected from external influences. The medium, as it flows in, moves the suspended body in the direction of flow. When the suspended body with its integral magnets reaches the position of the reed switch, this will be closed. If the flow rate increases, for the suspended body will move further in the direction of flow, at maximum until it reaches a stop. This stop prevents the suspended body from travelling past the switching range of the reed switch (bistable characteristics). Switching ranges All KSR flow switches are fitted ex-works with a normally open contact. The switch point can be smoothly adjusted within the switching range. The actual flow rate, corresponding to the velocity of flow present, can be much larger than the maximum scale value (typically twice as large). Position dependent The KSR flow switches DWG, DWM and DWM/A must be fitted vertically with the direction of flow from bottom to top. For all other types installed position is optional, but care must be taken to ensure the correct direction of flow when installing. Switching hysteresis This is how the distance of the suspended body between switch-on and switch-off flow rate is described. The shorter this switching distance, the lower the switching hysteresis, and the more precise the operation of the unit. By selecting magnets and reed switches with a small difference between response and drop-out excitation (close differential) the switching hysteresis is successfully kept low. Low switching hysteresis is always an advantage where accuracy is required. Display A local display is possible. On types with a sight glass the upper face of the suspended body is the read-off edge and indicates the flow on the scale etched into the sight glass. Models with a pointer scale can be read off corresponding to the scale. Please ensure that the particular scale is a matched to a particular medium. Technical advantages High switching precision. High functional reliability. Low switching hysteresis. Stepless switch point adjustment. Large switching range. Robust design. Viscosity compensated types are available. More Info Price