THERMAL FLOW SWITCHES FSW-420/30 Series Starts at Automatic Scaling and Setpoint No Moving Parts Pushbutton Re-Scaling if Needed Easy to Install The FSW-420/30 Series monitors your relative flow rate for applications where the actual flow rate is not important. The FSW-420/30 series is easy to install and use. Just put it into the pipe and it’s ready to go. The FSW-420/30 series sets your present flow-rate at 100% at power up. Relative flow rate is indicated by the 7 LED lights. When the flow rate drops to 50%, an alarm goes off. If you prefer, you can adjust the alarm point to fit your needs. A green output indicating LED is also included. FSW-422 insertion style switch, £218. Supply Voltage: 20 to 30 Vdc (short circuit protected) Switching Current: <200 mA Power Consumption: 6 W max Initial Operation: 15 seconds Output: PNP normally open (closed with flow), normally closed (open with flow) Model FSW-421 FSW-422 Shown smaller than actual size. FSW-433 in-line switch, £198. SPECIFICATIONS Media: Liquids Low Flow Setpoint: Pre-set to 50% (field adjustable) Operating Temperature: -20 to 80°C (-4 to 176°F) Response Time: 25 sec (typical) Repeatability: 1% Hysteresis: 10% of setpoint value typical Range: FSW-420 Series: 0 to 150 cm/sec FSW-431: 0 to 2.25 L/min FSW-432: 0 to 5.1 L/min FSW-433: 0 to 14.1 L/min Operating Pressure: 30 Bar (450 psi) Protection Class: NEMA 6 (IP67) Housing: Anodised aluminium Sensor Material: 303 stainless steel Tube Housing (FSW-430 series): Polyacetal Mounting (FSW-420 Series): 1⁄2 NPT or BSP Connection Tube OD: FSW-431: 6 mm (0.24") FSW-432: 8 mm (0.31") FSW-433: 12 mm (0.47") Electrical Connection: M12 male socket 4-pin, 2 m (7') cable with M12 connector and pigtail leads MOST POPULAR MODELS HIGHLIGHTED! To Order (Specify Model Number) Model No. FSW-421 FSW-422 FSW-431 FSW-432 FSW-433 Description Insertion flow switch, standard length* Insertion flow switch, extended length* In-line flow switch, 6 mm tube In-line flow switch, 8 mm tube In-line flow switch, 12 mm tube *For units with BSP threads, add “-BSP” to model number, no additional charge. Description Replacement connection cable 2 m Replacement connection cable 4 m Audible alarm Power supply, 24Vdc 1A. DIN rail mount Reference Book: Valve Selection Handbook Comes complete with 2 m pre-wired cable and operator’s manual. Ordering Examples: FSW-431, flow switch and mating connector for 6 mm tube, £198 FSW-421-BSP, insertion flow switch with 1/2" BSP thread, £198

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