Series SFI-100 & SFI-300 MIDWEST Sight Flow Indicator

Inexpensive Protection for Expensive Equipment and Systems

Series 100 and 300 Sight Flow Indicators are manufactured of quality materials and safety tested to assure long, dependable service at economical prices. The 100 and 300 Series offer threaded process connections, viewing windows, and bodies of brass or 316 SS. The 100 type has a single window with a rotating impeller, the 300 type has a double window with a rotating impeller, the 350 type has a double window with no moving indicator, and the 360 type has a double window with a flapper. All the types feature a removable window for easy service and replacement of wearing parts.

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Models & Ordering

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Model Description Usually Ships Price Order
SFI-100-1
Ships: Same Day
Price: $108.00
Sight flow indicator, 1" body, 4.375" L x 2.563" D x 2.625" H (111 x 65 x 67 mm), 2.7 lb (1.2 kg). Same Day $108.00 Order
SFI-100-1/2
Ships: Same Day
Price: $85.00
Sight flow indicator, 1/2" body, 4.000" L x 2.250" D x 2.563" H (102 x 57 x 65 mm), 1.5 lb (0.7 kg). Same Day $85.00 Order
SFI-100-1/4
Ships: Same Day
Price: $74.50
Sight flow indicator, 1/4" body, 3.000" L x 1.813" D x 2.125" H (76 x 46 x 54 mm), 1.1 lb (0.5 kg). Same Day $74.50 Order
SFI-100-1-1/2
Ships: Same Day
Price: $179.00
Sight flow indicator, 1-1/2" body, 5.688" L x 3.250" D x 3.625" H (144 x 83 x 92 mm), 5.5 lb (2.5 kg). Same Day $179.00 Order
SFI-100-1-1/4
Ships: Same Day
Price: $118.00
Sight flow indicator, 1-1/4" body, 4.375" L x 2.563" D x 2.625" H (111 x 65 x 67 mm), 2.7 lb (1.2 kg). Same Day $118.00 Order
SFI-100-2
Ships: Same Day
Price: $192.00
Sight flow indicator, 2" body, 5.688" L x 3.250" D x 3.625" H (144 x 83 x 92 mm), 5.5 lb (2.5 kg). Same Day $192.00 Order
SFI-100-3/4
Ships: Same Day
Price: $90.50
Sight flow indicator, 3/4" body, 4.000" L x 2.250" D x 2.563" H (102 x 57 x 65 mm), 1.5 lb (0.7 kg). Same Day $90.50 Order
SFI-100-3/8
Ships: Same Day
Price: $78.00
Sight flow indicator, 3/8" body, 3.000" L x 1.813" D x 2.125" H (76 x 46 x 54 mm), 1.1 lb (0.5 kg). Same Day $78.00 Order

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Specifications

Service:
Compatible gases and liquids.
Wetted Materials:
Window: tempered glass; Body: bronze or 316 SS; Gasket: Buna-N, fluoroelastomer or PTFE; Indicator: ABS or 316 SS impeller (100 and 300), 304 SS or 316 SS flapper (360).
Temperature Limit:
200°F (93°C).
Pressure Limit:
125 psig (8.62 bar), 150 psig (10.34 bar) on "MP" Models.
Connections:
Threaded.

Model Chart

EXAMPLE SFI 100 1/4 W2 Series SFI-100-1/4-W2 Sight Flow Indicator, single window, bronze body, ABS impeller, 1/4" body, with plexiglas window.
SERIES SFI       Sight Flow Indicator
BODY STYLE   100
100MP
300
300MP
300SS
300SSMP
350
350MP
350SS
350SSMP
360
360MP
360SS
360SSMP
    Single Window, Bronze Body, ABS Impeller
Single Window, Bronze Body, ABS Impeller, 150 psi
Double Window, Bronze Body, ABS Impeller
Double Window, Bronze Body, ABS Impeller, 150 psi
Double Window, SS Body, ABS Impeller
Double Window, SS Body, ABS Impeller, 150 psi
Double Window, Bronze Body, no Moving Indicator
Double Window, Bronze Body, no Moving Indicator, 150 psi
Double Window, SS Body, no Moving Indicator
Double Window, Bronze Body, no Moving Indicator, 150 psi
Double Window, Bronze Body, 304SS Flapper
Double Window, Bronze Body, 304SS Flapper, 150 psi
Double Window, SS Body, 304SS Flapper
double Window, SS Body, 304SS Flapper, 150 psi
BODY SIZE     1/4
3/8
1/2
3/4
1
1-1/4
1-1/2
2
  1/4"
3/8"
1/2"
3/4"
1"
1-1/4"
1-1/2"
2"
OPTIONS       W2
G1
G2
S1
S2
S3
S4
I1
I2
I3
F1
ST
BSPT
BSPP
Plexiglas Window
PTFE Gasket
Fluoroelastomer Gasket
Brass Shaft
316SS Shaft
Monel Shaft
No Shaft
ABS Impeller with Bronze Bushing
316SS Impeller
No Impeller
316SS Flapper
Stainless Steel Tag
BSPT Threads
BSPP Threads

Product Literature

Catalog Pages

Approvals

Drawings

Questions

Question
If a customer complains the impeller in his sight flow indicator is not turning, what is most likely the problem?
Answer
Usually the impeller is fouled or the indicator is doing its job and actually indicating no flow.
Question
If a customer claims the plastic impeller dissolved in plain water, what probably happened?
Answer
The customer exposed the sight flow indicator to fluid temperatures of 400-500 degrees Fahrenheit, considerably in excess of the published temperature specification.
Question
I see that the SFI-300 MIDWEST Sight Flow Indicator has a flow direction shown as an arrow. What will happen if water flows in the opposite direction? Will the rotating impeller rotate in both directions? I want to use the indicator on a wakeboard boat to show water being pumped in both directions on a wake ballast system.
Answer
The inlets and outlets for SFI-300 are designed for flow to only be in one direction. You could physically push flow in the opposite direction, but you would risk damaging the impeller, and you would not get a true indication of flow.

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