FLOW SWITCHES FOR LIQUIDS FLOW CONTROLS Flow switches for liquids Tutti i dati ed i contenuti di questa scheda sono di proprieta esclusiva di Riels Instruments Function Flow control of corrosive liquids, sea water and normal liquids (depending on model). Signalling of lack or excessive decrease in flow rate (safety switch). Made of brass, suitable for normal liquids, and Aisi 316L stainless steel, suitable for sea water and corrosive liquids. Applications For use in piping of industrial plants: - heating and air-conditioning systems; - refrigeration systems; - fire protection systems; - heat pumps; - oil control equipment; - lubrication circuits. Accessory DBZ-09 - Aisi 316L stainless steel vanes for liquid flow switch Technical specifications Contacts: dust-proof microswitch, changeover contacts (n.c./n.o.) Operation: -40...+85 °C 10...90% r.h. (without condensation) Connection: see flow rate table Body: see table above Vane: stainless steel AISI 316L Container: ABS base, transparent PC lid Installation The flow switch can be mounted in any position away from elbows or constrictions and with the arrow pointing in the direction of flow. For installations on vertical pipes, the device must be readjusted to compensate for the weight of the paddle. If the unit is mounted downwards, attention must be paid to any deposits that may form. The unit must be mounted in a straight section of pipe without filters, valves, etc., at least 5 times as long as its diameter, both upstream and downstream. Electrical connections Connect to the red and white contact of the microswitch (fig.1). The red-white contact opens when the flow drops below the set value. When there is no flow, the red-blue contact closes and can be used as an alarm or signalling contact. Riels Instruments Srl • +39 049 8961771 • www.riels.it • [email protected]

Note The flow switch is calibrated at the factory with reference to the minimum cut-off value. To increase this value, turn the adjustment screw clockwise. The cut-off value must be >= the minimum flow required to guarantee the protection of the system. With devices without T-piece, 4 vanes are supplied (see vane drawing), which must be cut according to the pipework. All units with T-piece can be supplied on request. Attention If the device is used as a minimum flow controller, an additional control device must be placed downstream to activate the alarm condition. Tutti i dati ed i contenuti...