Your Source for Process Measurement & Control
Product Groups
Liquid Flow Transmitter and Switch
TRODEKS Engineering | Thermocouples, Pressure Transducers, Flow Meters, PID Controllers
FSW-9000 Series
  • High Reliability — No Moving Parts
  • 4 to 20 mA, PNP/NPN (Transistor), or Relay Output
  • Excellent Low Flow Sensitivity
  • Can Operate in Temperatures up to 120°C (248°F) with Sanitary Option
 Manuals (contact with email : [email protected])


The FSW-9000 Series is a flow switch monitor that measures the velocity of the flow. It is ideal foruse in measurement and control liquid applications. The FSW-9000 Series provides two output options:a 4 to 20mA analog output and a PNP/NPN output. For the 4 to 20 mA output, the electronics’ moduleconverts the signal from the probe to a 4 to 20 mA analog output, which can be used to indicate flowrate. For the PNP/NPN output, the measured flow rate is compared to the setpoint value selected by theuser and the switch changes state once the setpoint value has been achieved.

The FSW-9000 Series microprocessor based electronics and unique self-calibration programgives the flow switch superior temperature compensation, a fast response time (adjustable from 3 to10 seconds) and increased long term switch point stability. Even in the event of a power failure, thecalibration program will store values for maximum and minimum flows for up to 10 years.

A chain of 8 LEDs gives the user a visual indication of the flow rate as well as setpoint status, and onedi-chromatic LED indicates switch point status. In addition, if there is a problem with the unit, the 8 LEDswill flash continuously providing troubleshooting information.

The conical shape of the sensor’s tip means that the probe can be installed at almost any angle in thepipe and that if the probe is misaligned, accuracy will not be affected. The sensing element andconnection of the FSW-9000 Series are made with 316 SS and the standard enclosure is glass-filled nylon. The FSW-9000 Series can be made with a great variety of process connections such as threaded, flange, or sanitary and isalso available in an aluminum enclosure for hazardous environments. Intrinsic safety barriers required for explosion proofareas.

Measuring Ranges for FSW-9000 Series
The FSW-9000 Series nominal measuring range is 0.04 to 2.0 m/s. The switch can be set to trip at anyvalue in this range. To calculate the velocity for your application, use the following simple formula:

V= (1.27 X Q)/D², where:
Q = Flow rate in meters per second
D = Pipe internal diameter in meters
V = Fluid velocity in meters per second

Please note that the 4 to 20 mA option is scaled over 0 to 2.0 m/s.

The FSW-90-R is very similar to the FSW-9000 Series with one main difference: The sensor is separatefrom the electronics and it does not have an enclosed housing. This gives the FSW-90-R Series theability to be installed in very small pipes and be remotely controlled by the FSCN-91 relay. The FSW-90-RSeries is the ideal solution when there is not a lot of space to install even a compact unit or when thereis a need for a mounted relay. FSCN-91 relay can operate with DC or AC supply voltage and provides an analog 4 to 20 mA and SPDT output. The FSCN-91 enclosure is made with ABS and can be mounted on a DIN rail or byusing 2 fixing screws.

Accuracy: ±5% of setpoint
Repeatability: ±1% of setpoint
Power Supply:
   FSW-90-R: 85 to 240 Vac, 50/60 Hz or 24 Vdc ±10%;
   FSW-9000: 24 Vdc ±10%
Temperature Range:
   Process: -20 to 80°C (-4 to176°F) (Sanitary option to 284°F for CIP)
   Operating: -20 to 60°C (-4 to 140°F)
Max Pressure: 300 bar (4351 psi)
Protection Class: NEMA-4 (IP65)
Wetted Materials: 316 Stainless Steel
Enclosure Material: Glass filled nylon standard; aluminum head optional
Process Connection: 1/2 to 1-1/2 NPT, Tri-GripTM (Tri-Clamp® compatible), or flange
   FSW-90-R and FSCN-90: relay (SPDT) and 4 to 20 mA;
   FSW-9000: transistor NPN/PNP (400 mA) and 4 to 20 mA
Switch Point Adjustment: Potentiometer
Bargraph: 8 LED
Switch Point Status:
   Red LED: No flow
   Green LED: Flow
Response Time: 3 to 10 sec nominal
Max Start-Up Delay: 12 seconds
Switching Range: 0.04 m/s to 2 m/s (water)
   Nylon Head: 89 H x 64 mm D (3.5 x 2.5")
   Aluminum Head: 89 H x 108 mm D (3.5 x 4.25")
   Probe Diameter: 16 mm (0.625")
   Insertion Length: 1-3/8, 2 and 3" standard; for other lengths consult Flow Engineering
Weight: Approx. 680 g (1.5 lb)
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