Omega Engineering Thermometer FSW 50 User Manual

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FSW-50 Series  
Industrial Flow Switches  
M0772/0802  
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General Description  
Notes  
®
The OMEGA FSW-50 Series Flow Switches feature a 15A SPDT switch  
and an internal screw adjustment which provides continuous switch point  
adjustment while in operation in-line. Multiple drag disks are supplied  
with each unit to provide incremental switch point adjustment. Their non-  
magnetic design makes them ideal for applications where rust is a problem.  
The FSW-50 comes standard in a plastic/316SS construction. The FSW-50  
Series is also available in a special PPS* Hastelloy C and Viton construction.  
The FSW-50 Series are for use in highly particle-contaminated liquids  
such as sewage, machine cutting oils and medium slurries. The standard  
models can be used in mildly corrosive liquids such as low to medium  
concentration acids and bases; sea water, sewage oils; rusty coolant water,  
etc. The special PPS* Hastelloy C and Viton construction models are for  
use in concentrated corrosive liquids such as sulfuric, nitric, hydrochloric  
and acetic acids; ferric chloride; aqueous ammonia; benzene; magnesium  
chloride, etc.  
Particle contamination resistance is provided by a flexible filter boot  
which prevents crystallization, caking, heavy dirt concentration, slurries,  
scum, etc., from affecting the operation of the flow detector. The FSW-50  
Series Switches respond to flow only, independent of line pressure,  
temperature and environment.  
During emergency conditions these switches signal catastrophic system  
failures such as line breakage; pump failure; incorrect valve opening or  
closing; pipe, valve or filter clogging, etc.  
Specifications  
FLOW RANGE (water calibrated @ 70˚F)  
The maximum flow range flexibility is provided by three adjustment  
options:  
1. Continuous adjustment while operating via a calibrated  
FORCE/BALANCE spring.  
2. Step incremental adjustment via drag disk size change.  
3. Continuous adjustment via moment arm change.  
12  
1
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Notes  
Available Drag Disks  
The FSW-50 Series Switches come with three different drag disks. The  
drag disks are sized as follows:  
DRAG DISK  
SIZE  
#1  
#2  
#3  
.5" dia.  
.83" dia.  
1.0" dia.  
The following table lists flow adjustment limits for various pipe sizes  
relative to Model No. and drag disk size. The moment arm (see Step 3 of  
FLOW RANGE) is held constant at the maximum value. Decreasing the  
moment arm, increases the adjustment range.  
Low Flow  
Model  
Number  
Nominal  
Low Flow  
Cont. Adj.  
Range  
Pipe  
Size  
(Ins.)  
Nominal  
High Flow  
Cont. Adj.  
Range  
High Flow  
Model  
Number  
% Increase  
of Listed  
Flows via  
Moment  
(GPM)  
(GPM)  
Arm Adj.  
FSW-50 w/drag  
disk #2  
* **  
8-13  
* **  
18-28  
FSW-50 w/drag  
disk #1  
1
None  
Shortest drag  
disk arm.  
Mid. size  
Shortest drag  
disk arm.  
Smallest drag  
disk  
3.3-5.3  
ft/sec  
7.4-11.5  
ft/sec  
drag disk  
1
/
2
FSW-51 w/drag  
disk #3  
15-30  
25-50  
40-80  
1
30-60  
50-105  
80-155  
FSW-51 w/drag  
disk #1  
2
None  
1
/
2
2
Mid. size  
drag disk  
arm. Largest  
drag disk  
Mid. size  
drag disk  
arm. Smallest  
drag disk  
2.7-5.4  
ft/sec  
5.4-10.8  
ft/sec  
FSW-52 w/drag  
disk #3  
40-90  
3
90-180  
120-240  
155-310  
245-480  
350-700  
600-1200  
950-1900  
FSW-52 w/drag  
disk #1  
1
/
2
60-120  
3
+25%  
75-155  
4
5
Longest drag  
disk arm.  
Largest  
120-245  
180-350  
300-600  
500-950  
Longest drag  
disk arm.  
Smallest  
6
8
drag disk  
10  
drag disk  
2.4-4.0  
ft/sec  
4.0-8.0  
ft/sec  
**Force/Balance spring relaxed.  
**Force/Balance spring fully extended.  
2
11  
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Relay Switch:  
SPDT 15A @ 125 or 250 Vac, 10,000,000  
operations median  
Notes  
Nominal Sensitivity  
(% Flow Change to  
Activate Switch):  
Approximately 10% @ upper end of  
range; approximately 30% @ lower end of  
range  
Differential Pressure  
Drop Across Unit:  
(Under normal operating conditions)  
1"-3" pipe, less than 0.5 PSI; 4"-10" pipe,  
negligible  
Working Line Pressure:  
For standard construction model: 100  
PSIG at 150˚F; for special PPS*, Hastelloy  
C and Viton construction model: 100  
PSIG at 200˚F  
Maximum Continuous  
Temperature:  
Standard construction: 150˚F; special  
construction: 200˚F  
Wetted Parts:  
Standard construction PPS*, 316 SS, Viton  
PVC; Special construction: PPS*,  
Hastelloy C and Viton  
Electrical Cable Fitting:  
Weight:  
Water resistant for cable diameters .250"  
0.25"  
0.25 lb.  
PPS* = polyphenylene sulfide plastic  
Installation Dimensions  
INSTALLATION WARNING  
1
1
/
4
/
2
THE 1 " X 1 " PVC BUSHING (WHITE OR GRAY) SUPPLIED WITH THE FSW-50 SERIES CAN BE  
CRACKED IF THE CENTER BODY IS FIRST TIGHTENED INTO THE BUSHING. CRACKING PROBABILITY  
IS REDUCED IF THE BUSHING IS FIRST TIGHTENED INTO THE PIPE OR TANK FITTING AND THEN THE  
CENTER BODY TIGHTENED INTO THE BUSHING. THUS:  
STEP 1: THREAD AND TIGHTEN THE PVC BUSHING INTO THE PIPE OR TANK FITTING.  
STEP 2: THREAD AND TIGHTEN THE CENTER BODY INTO THE PVC BUSHING.  
10  
3
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ASSEMBLY WARNING  
THE FSW-50 SERIES SWITCHES EMPLOY AN EXTERNAL SEAL SHAFT (A) A FLEXIBLE ELASTOMER  
DIAPHRAGM SEAL (B) AND AN INTERNAL FEED THRU SHAFT OR SWITCH ACTUATING ARM (D). ALL  
THREE ELEMENTS ARE ASSEMBLED AND LOCKED IN PLACE WITH LOCTITE ADHESIVE. TO PREVENT  
RUPTURE OF SEAL AND LEAKAGE INTO SWITCH AREA, IT IS CRITICALLY IMPORTANT THAT TORQUE  
NOT BE APPLIED TO SEAL SHAFT (A), FLOAT SHAFT (E) OR DRAG DISK ARM (E) DURING CHANGE  
OF FLOAT OR DRAG DISK.  
10402-6. GROMMET  
10402-5. STRAIN RELIEF NUT  
IF FLOAT SHAFT OR DRAG DISK ARM (E) REQUIRE REPLACEMENT IT IS NECESSARY TO REMOVE  
FILTER BOOT (F). SEAL SHAFT (A) MUST THEN BE HELD FIRMLY IN A VISE OR WITH PLIERS WHILE (E)  
IS UNTHREADED AND A NEW SHAFT IS ASSEMBLED.  
10402-2. COVER  
3. 4 RETAINING SCREWS  
(NOT SHOWN)  
10402-27. LEADSCREW  
10402-30. MICROSWITCH COMPLETE  
WITH 3 SLIP-ON TERMINALS  
10402-29. LEADSCREW NUT  
10402-28. LEADSCREW RETAINING  
SLEEVE  
10402-23. MICROSWITCH BRACKET  
COMPLETE WITH SPRING LEVER  
10402-26. ADJUSTING SPRING  
10402-1. BODY  
10402-31. 2 SCREWS  
32. 2 NUTS  
33. 2 SPLIT LOCKWASHERS  
34. 1 PLAIN WASHER  
1
4
10402-35. 1 / " x 1" BUSHING  
10402-4. O-RING  
SUPPLIED  
10402-24. 2 SCREWS  
25. 2 SPLIT LOCKWASHERS  
DIAPHRAGM CLAMPING  
(SONICALLY WELDED)  
10402-21. SEAL SHAFT ASSEMBLY  
SUPPLIED ONLY COMPLETE WITH  
A) SEAL SHAFT  
B) DIAPHRAGM  
C) DIAPHRAGM WASHER  
D) FEED THRU SHAFT  
3 RETAINING SCREWS  
Installation  
The FSW-50 Series Fluid Flow Switch is supplied with a 11/ " x 1" PVC TT  
4
bushing (standard construction model) or 11/ " x 1" PPS* bushing (special  
10402-15. DRAG DISK ARM MODEL FSW-50  
16. DRAG DISK ARM MODEL FSW-51  
17. DRAG DISK ARM MODEL FSW-52  
4
PPS* Hastelloy C and Viton construction model) threaded in place with 2  
to 3 wraps of Teflon tape, which must be intact or renewed if bushing and  
switch are separated before assembly in tank. Care must be exercised  
when threading the bushing into plastic or metal fittings.  
Apply a minimum of 2 to a maximum of 3 wraps of Teflon tape to  
threads of bushing – this is especially important if unit is to be used in  
metal fittings where coarse metal threads could gall plastic if not  
lubricated.  
WARNING  
10402-18. DRAG DISK #1 (SMALL)  
19. DRAG DISK #2 (MEDIUM)  
20. DRAG DISK #3 (LARGE)  
DO NOT APPLY TORQUE TO DRAG DISK  
ARM SINCE IT MAY BE UNTHREADED  
FROM SEAL SHAFT (A).  
The plastic bushing CAN BE CRACKED if the main body of the flow  
switch is tightened into it FIRST. Cracking will not occur if the bushing is  
FIRST tightened into the pipe or tank fitting and THEN the body is  
tightened into the bushing.  
PPS* = polyphenylene sulfide plastic  
FSW-50 Series w/Special Ryton R-4, Hastelloy C and Viton Construction  
Parts Diagram  
4
9
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Thus: 1. Teflon tape thread and tighten the plastic bushing into the pipe  
or tank fitting.  
2. Teflon tape thread and tighten the switch into the PLASTIC  
bushing by applying a wrench to the hexagon section. Repeat  
steps 1 and 2 until the ARROW on the body points in the  
DIRECTION OF FLOW and threads are leak tight.  
10398-6. GROMMET  
10398-5. STRAIN RELIEF NUT  
NOTE  
10398-2. COVER  
3. 4 RETAINING SCREWS  
(NOT SHOWN)  
10398-28. LEADSCREW  
Plumber’s tools such as pipe wrenches are not recommended. If possible, use a ‘Rigid’ type  
wrench where the smooth jaws closely fit the hexagon section.  
10398-31. MICROSWITCH COMPLETE  
WITH 3 SLIP-ON TERMINALS  
10398-30. LEADSCREW NUT  
Electrical Wiring  
1. Remove gland nut, grommet and switch cover.  
2. Strip outer jacket of electrical cord back approximately 11/ inches.  
10398-29. LEADSCREW RETAINING  
SLEEVE  
10398-24. MICROSWITCH BRACKET  
COMPLETE WITH SPRING LEVER  
4
Strip insulation from individual conductors back approximately  
1
10398-27. ADJUSTING SPRING  
10398-1. BODY  
/ inch.  
4
10398-32. 2 SCREWS  
33. 2 NUTS  
3. Slip on terminals are supplied with each switch. Remove from switch  
terminals and crimp on or solder to electrical leads.  
34. 2 SPLIT LOCKWASHERS  
35. 1 PLAIN WASHER  
4. Feed electrical cable through gland nut, grommet and switch cover as  
shown.  
1
4
10398-36. 1 / " x 1" BUSHING  
10398-4. O-RING  
SUPPLIED  
10398-25. 2 SCREWS  
26. 2 SPLIT LOCKWASHERS  
10398-10. DIAPHRAGM CLAMP RING  
(SONICALLY WELDED)  
10398-22. SEAL SHAFT ASSEMBLY  
SUPPLIED ONLY COMPLETE WITH  
A) SEAL SHAFT  
B) DIAPHRAGM  
C) DIAPHRAGM WASHER  
D) FEED THRU SHAFT  
5. Apply slip on terminals to appropriate contacts of microswitch.  
3 RETAINING SCREWS  
6. Slide the cover down the cable and fasten to the body of the switch  
with 4 screws provided.  
7. Slide the grommet down the cable until the outer jacket is level with  
the small end of the grommet.  
10398-16. DRAG DISK ARM MODEL FSW-50  
17. DRAG DISK ARM MODEL FSW-51  
18. DRAG DISK ARM MODEL FSW-52  
FLEXIBLE DRAG STRIP ASSEMBLY  
IS AVAILABLE TO REPLACE DRAG  
DISK AND DRAG DISK ARM. NO  
FILTER BOOT IS USED.  
8. Push the grommet into the tapered end of the cover. Hold the cable  
jacket to prevent rotation and thread the gland nut firmly on to the  
cover.  
10398-37. DRAG STRIP  
38. CLAMP WASHER  
Figure 1: Wiring Schematic for power applied to the load when the flow level is  
less than set point (power to load interrupted when flow increases to above set  
point).  
39. DAMPENER WASHER  
40. SCREW x 3/8" LONG  
41. 2 PLAIN WASHERS  
42. SPLIT LOCK WASHER  
10398-19. DRAG DISK #1 (SMALL)  
20. DRAG DISK #2 (MEDIUM)  
21. DRAG DISK #3 (LARGE)  
WARNING  
DO NOT APPLY TORQUE TO DRAG DISK  
ARM SINCE IT MAY BE UNTHREADED  
FROM SEAL SHAFT (A).  
FSW-50 Series w/Standard Construction Parts Diagram  
8
5
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6. If the system flow rate is changed, the FSW-50 can be adjusted to  
monitor the new flow rate by turning the adjusting screw in a  
counterclockwise direction to the minimum flow position and then  
proceeding as in Step 4 above.  
Figure 2: Wiring Schematic for power applied to load when the flow is greater  
than set point (power to load interrupted when flow decreases to below set  
point).  
7. In the event that the system flow is at the desired rate and the  
adjustment mechanism runs out of travel, i.e., the leadscrew nut is at  
either end of the support bracket before the microswitch is actuated,  
then the drag disk must be changed to shift the flow range so that it  
straddles the system flow rate.  
EXAMPLE: If the FSW-50 is fitted with a No. 1 drag disk and the  
procedure in Step 4 has been followed, the adjusting screw has been  
turned counterclockwise until the leadscrew nut is at the extreme end of  
the support bracket (spring fully relaxed) and the microswitch still has  
not been actuated, then the flow is too low and a larger drag disk will  
have to be substituted for the drag disk #1 and the procedure in Step 4  
repeated. If the No. 2 disk will not allow switch actuation via the  
procedure in Step 4, substitute disk No. 3.  
Switch Point Adjustment  
The opposite procedure is used if the flow is so high that full extension of  
the spring cannot counterbalance the fluid forces on the drag disk and the  
switch remains actuated. Proceed by using a smaller drag disk, e.g.,  
replace No. 3 with a No. 2, or a No. 2 with a No. 1 until the procedure in  
Step 4 can be accomplished.  
1. Thread the unit into line while observing the following precautions:  
a) Use appropriate adapters to keep the body of the switch from  
projecting into the flow stream.  
b) Inspect to make sure that the drag disk does not touch the opposite  
wall of a small diameter pipe.  
Adjusting the moment arm can be employed after adjustment by the  
spring and changing drag disk sizes have been tried to no avail.  
Adjusting the moment arm consists of moving the drag disk along the  
arm thereby changing the force-balance moment arm. Moving a drag disk  
to the far end of the arm lowers the flow rate required to activate the  
switch. Moving a drag disk towards the filter boot increases the flow rate  
required to activate the switch.  
c) Use Teflon tape to seal the threads and lubricate to allow the arrow  
on the body to be aligned with the flow.  
2. After aligning the arrow with flow, adjust the flow in the system to the  
desired rate without regard to the FSW-50 Series switch point setting.  
3. The Switch Point Adjusting Mechanism consists of a leadscrew, a  
leadscrew nut and a helical spring.  
CLOCKWISE rotation of the adjusting screw changes the microswitch  
actuation point toward HIGHER flow rates. COUNTERCLOCKWISE  
rotation changes the microswitch actuation point toward LOWER flow  
rates.  
NOTE  
NOTE  
It is necessary throughout all installation and adjustment procedures to check to ensure that  
the drag disk is perpendicular to the flow and does not touch any interior surface through-  
out its complete fore and aft travel.  
All FSW-50 Series Switches are factory set at the lower end of the flow range, i.e., the  
adjusting screw is set at the low flow COUNTERCLOCKWISE position.  
The leadscrew nut locks the adjusting screw in position, maintaining the  
flow set point under all environmental conditions.  
4. Turn the adjusting screw in a clockwise direction until the microswitch  
is actuated while maintaining the desired fluid flow rate in the system.  
Turn the adjusting screw two additional turns in the clockwise  
direction and then slowly back off in a counterclockwise direction until  
microswitch is again actuated. The FSW-50 Flow Switch is now set for  
maximum sensitivity for detecting small flow changes.  
5. Microswitch actuation point may be monitored during the adjustment  
procedure detailed in Step 4 above by an audible click or with an OHM  
meter before connecting line power or by monitoring the voltage  
supplied to the load through the microswitch.  
6
7
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