Monitored media are water and watery liquids, oils, air and gases, even with high pressure values. The flow switch FS20 is a further extension of the flow monitor range of E-T-A for applications in pipes with big diameters as well as in cooling equipment with thick-walled insulation.
Major features of the compact single-point flow switch are its optimised design for the special applications, the push-in monitoring head and the wide temperature range which makes it suitable for use in ambient temperatures from -25° to +100°C.
The integral electronic control unit in the stainless steel monitoring head saves space. Electrical connection is by means of a 3-pole M12 connector to IEC 947. The required supply voltage is 24V dc.
The FS20 allows monitoring of either a maximum or minimum limit value. The desired switch point may be adjusted steplessly by the user depending on the medium via a potentiometer. A short-circuit proof switching output provides signalisation with a power Mosfet. Power failure, e.g. in the event of wire breakage, will be signalled like a flow fault.
Method of operation of the E-T-A flow switches type FS20 is the calorimetric principle. The invasive measurement implies no moving parts in the flow stream and no wear, keeping the equipment maintenance-free; impairment of the medium is excluded.