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
SPECIFICATIONS Media: Liquids Low Flow Set Point: Pre-set to 50% (field adjustable) Operating Temperature: -20 to 80°C (-4 to 176°F) Response Time: 25 seconds (typical) Repeatability: 1% Hysteresis: 10% of set-point 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: Anodized aluminum Sensor Material: 303 stainless steel Tube Housing (FSW-430 series): Polyacetal Mounting (FSW-420 Series): ½ NPT 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 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), optional normally closed (open with flow)
† All dollar amounts on this site are shown in US currency. Note: Comes complete with operator's manual and pre-wired 2m(6/5') cable.
Standard valves are Normally Open. For optional Normally Closed valves, add "-NC" to model number, no additional charge.
Ordering Example: (1) FSW-431 Flow switch and mating connector, 6 mm (0.24"), $450.00, plus (1) PSU-93 Power supply , $40.00, plus (1) 70A-1 Audible alarm, $25.00, $450.00 + 40.00 + 25.00 = $515.00