Omega 430 User Manual
FSW-420/430
Thermal Flow Switches
M-4586/1007
FSW-420/430 INSTALLATION & INSTRUCTION SHEET
Install the FSW-420/430 by inserting the ½” MNPT threaded sensor tip into a tapped pipe or T-tting. Use Pipe Tape or 1.0
Plumbers Putter on NPT threads to aid in sealing. Tighten rmly, but do not over tighten as this could damage the NPT
threads and prevent proper sealing.
With provided connection cable disconnected, complete unit wiring by connecting the Brown wire to +24VDC supply and the 2.0
Blue wire to common. The Black wire is now connected to the + side of your load. The – side or common of your load is
now also connected to ground. NOTE: Be sure that the common (ground) of the FSW-420/430 and the LOAD are the same.
The white wire (if present) is not used.
Setting unit zero point: With the media ow turned off depress setup button located on the front of the unit with a small 3.0
instrument (Screwdriver or Paper Clip) and hold while connecting the pre-wired cable to the unit. The setup button is located
on the face of the FSW-420/430 just between the Flow OK and the Overow LED’s. The cable would have been pre-wired
in step 2 above. Once the unit comes on remove the instrument from the setup button and allow the unit to go through it’s
zero point calibration. The unit will start with the far right LED and increment to the left. Once nished all LED’s should be
off except for the blinking set-point indicator.
Setting unit range: Turn on your ow and allow the ow to reach full normal ow rate. Then with the setup instrument used 4.0
in step 3.0 above, depress the set/range button on the face of the FSW-420/430 (located just between the Flow OK and
Overow LED’s). Hold for 5-6 seconds and the FSW-420/430 will range itself to the full ow rate or 5 ft/second whichever is
less (this process could take 45-60 seconds). All of the 7 LED’s will ash when auto scaling is complete and the Set Point
LED will begin to ash (default is set for 50%). The Green Flow OK LED will come on when the ow rate goes above the set
point and the output signal of the unit will change states.
Should you wish to set the set-point at a different LED setting (or rage of ow) simply depress the set/range button repeatedly 5.0
inshore intervals, and the set-point will change clockwise to any LED you wish to choose. When the correct LED is ashing
your new set point is established.
The Over Range light (Offset RED LED) will come on if your already established full ow rate were to increase. If you wish to 6.0
rescale to the new ow rate, simply depress the set button again as you did in Step 3.0 and reset your set-point if desired,
using the same procedure as in item 4.0 above. See additional notes.
NOTE: Use caution while installing the FSW-420/430 so as not to damage the tip of the sensor. The electronics are
embedded just behind the tip of the FSW-420/430 and denting or bottoming out of the tip could cause damage.
Maintenance is not required, as the FSW-420/430 has no moving parts. However, should the sensor become coated after a period
of time in operation due to water or media conditions, simply wipe the probe tip with a soft cloth and alcohol.
FSW-420/430
Thermal Flow Switches
M-4586/1007
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