DWYER INSTRUMENTS,INC.
P.O.BOX 373 MICHIGAN CITY, INDIANA 46361, U.S.A.
Phone: 219/879-8000 www.dwyer-inst.com
Lit-By Fax: 888/891-4963
MAINTENANCE/REPAIR
Regular maintenance of the total system is recommended to assure sustained optimum performance. These devices are
not field repairable and should be returned to the factory if recalibration or other service is required. After first obtaining a
Returned Goods Authorization (RGA) number, send the unit freight prepaid to the following. Please include a clear descrip-
tion of the problem plus any application information available.
Dwyer Instruments, Inc.
Attn: Repair Department
102 Highway 212
Michigan City, IN 46360
Important Points!
Product must be maintained and installed in strict accordance
with the National Electrical Code and Dwyer product catalog
and instruction bulletin. Failure to observe this warning could
result in serious injuries or damages.
For hazardous area applications involving such things as (but
not limited to) ignitable mixtures, combustible dust and
flammable materials, use an appropriate explosion-proof
enclosure or intrinsically safe interface device.
The pressure and temperature limitations shown on the
individual catalog pages and drawings for the specified flow
switches must not be exceeded. These pressures and
temperatures take into consideration possible system surge
pressures/temperatures and their frequencies.
Selection of materials for compatibility with the media is critical
to the life and operation of Dwyer flow switches. Take care in
the proper selection of materials of construction, particularly
wetted materials.
Life expectancy of switch contacts varies with applications.
Contact Dwyer if life cycle testing is required.
Ambient temperature changes do affect switch set points,
since the specific gravity of a liquid can vary with temperature.
Flow switches have been designed to resist shock and vibration;
however, shock and vibration should be minimized.
Filter liquid media containing particulate and/or debris to
ensure the proper operation of our products.
Electrical entries and mounting points in an enclosed tank
may require liquid/vapor sealing.
Flow switches must not be field-repaired.
Physical damage sustained by the product may render it
unserviceable.
SF2 Series
Sight Flow Meters
Instruction Bulletin No. 201917
←
SF2 Sight Flow Meter units monitor dynamic fluid flow. The rotor reacts
to turbulence, pulsation, entrained air, and other flow anomalies induced
in the flow stream by other process hardware. For optimum perfor-
mance, install SF2 Sight Flow Meter units where nominal flow condi-
tions exist, with ports located at the top. Incoming flow may be placed
to either port. A minimum of 8" of straight pipe on the inlet side is
recommended.
Low Flow Applications
A low flow adapter is supplied with all SF2 Sight Flow Meter units. It is used to produce accurate response at low flow
rates. Press fit the adapter as shown above, in the port selected for incoming flow. See Flow Range Chart below.
Installation: SF2 Sight Flow Meters connect to piping via NPT mating thread forms. The following guidelines are provided to
assist with installation for a leak-free seal, without damage to the unit: 1) Apply pipe thread sealant to male pipe threads. 2)
Thread SF2 Sight Flow Meter unit onto male pipe thread until hand-tight. 3) Tighten pipe 1 to 1-1/2 additional turns. 4) If improper
seal results, continue turning pipe into unit in 1/4 turn increments. Do not exceed one additional turn. Recommended Pipe
Sealants: (a) Permatex
®
"No More Leaks" (b) Teflon
®
Thread Tape.
Filtration and Cleaning: 150 micron filtration is recommended. However, should foreign particles enter the SF2 Sight
Flow Meters, accumulation is easily cleared by removing the lens from the body. The lens is removed by turning its center rib 45°
counter-clockwise and then pulling it out. To reinstall the lens, simply reverse the process. Pressure must be relieved from the
system prior to sensor clean-out.
Low Flow
Adapter
8" Min.
Incoming
Flow
(For Additional Information, See Dwyer Catalog)
Input
Power
Range
Low Flow*
Standard
0.1 to 1.0
1.5 to 12.0
N/A
N/A
24 VDC
110 VAC
24 VDC
110 VAC
24 VDC
110 VAC
24 VDC
110 VAC
SF2-104
SF2-101
SF2-114
SF2-111
SF2-124
SF2-121
SF2-134
SF2-131
Range
0.5 - 5.0
4.0 - 20.0
3.0 - 30.0
5.0 - 60.0
Flow Range - GPM
.25"
.50"
.75"
1.0"
Port Size
NPT
Model
Number
* With use of low flow
adapter supplied
(2 pages)
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