Jacoby Tarbox — Sight Flow Indicators
Flanged Bulls-Eye Sight Flow Indicators
ANSI 150# · ASME Class 300 / 600 / 900 / 1500 · 1/2" – 16" · Flapper, Plain, Rotor, Drip & Gas Indicator Types
Full ASME Rated Flanged Bulls-Eye Sight Flow Indicators
Jacoby-Tarbox's full ASME rated line of flanged bulls-eye sight flow indicators are engineered to the design criteria of ASME B31.1 & B31.3 Power & Chemical Piping Codes, incorporating all ASTM listed materials for pressure retaining components including bodies, fasteners, and retainers. Available in ANSI 150# (1/2"–16") and high pressure Class 300/600/900/1500 (1/2"–8"). Five indicator types: Plain, Flapper, Rotor, Drip, and Gas Indicator.
Compliance & Standards
Process View Maximized
View matches or exceeds pipe inside diameter allowing unobstructed process observation of liquids, slurries, gases, and solids.
Minimal Pressure Drop
Non-rotor models have unrestricted flow — no obstruction to the process stream.
Safely Monitor
Observe color, clarity, air entrainment, and interface — all from outside the process line.
Ideal Applications
Drain lines, lube systems, hydraulic systems, condensate, food service, and return lines.
Standard Features
Window / Shield Options
ANSI 150# Flanged Models
1/2" – 16" · 285 PSI @ 100°F · Integrally cast ASME flanges
Orientation: Horizontal or Vertical
Bi-directional and may be placed in any orientation. Used to observe presence or absence of fluid, color, clarity, air entrainment, and interface. No flow restriction.
Sizes
1/2" – 16" (ANSI 150# flanges)
Pressure
285 PSI @ -20 to 100°F
Temperature
Up to 500°F (material dependent)
Body
Carbon Steel standard; 316 SS, Bronze, 316L SS, Alloy 20, Hastelloy available
Glass
Tempered borosilicate glass
Indicator
None / Plain (bi-directional)
Orientation: Horizontal or Vertical Upward
Employs a 316SS hinged weighted flapper with 316 pin to indicate flow. The velocity of the flow is indicated by the position of the flapper. Optimal for horizontal or vertically upward flows.
Sizes
1/2" – 16" (ANSI 150# flanges)
Pressure
285 PSI @ -20 to 100°F
Temperature
Up to 500°F (material dependent)
Body
Carbon Steel standard; 316 SS, Bronze, 316L SS, Alloy 20, Hastelloy available
Glass
Tempered borosilicate glass
Indicator
316 Weighted Flapper with 316 Pin (uni-directional)
Orientation: Horizontal or Vertical
PTFE rotor with 316 pin indicates relative process velocity by rotation speed. Dimensionally interchangeable with flapper, plain, drip, and flutter models. More sensitive to passing fluid, especially in low flow applications.
Sizes
1/2" – 16" (ANSI 150# flanges)
Pressure
285 PSI @ -20 to 100°F
Temperature
Up to 500°F (material dependent)
Body
Carbon Steel standard; 316 SS, Bronze, 316L SS, Alloy 20, Hastelloy available
Glass
Tempered borosilicate glass
Indicator
PTFE Rotor with 316 Pin (bi-directional)
Orientation: Vertical Downward or Horizontal
Low, intermittent flows are easily detected in the horizontal or vertically downwards direction. The 316SS drip tube forces the process to collect on the lower lip, allowing it to visibly drip downward. Ideal for condensing gases or partially full liquid lines.
Sizes
1/2" – 16" (ANSI 150# flanges)
Pressure
285 PSI @ -20 to 100°F
Temperature
Up to 500°F (material dependent)
Body
Carbon Steel standard; 316 SS, Bronze, 316L SS, Alloy 20, Hastelloy available
Glass
Tempered borosilicate glass
Indicator
316 Drip Tube (uni-directional)
Orientation: Horizontal or Vertical Upward
Ultralight PTFE indicator with 316 mount for gas flow and low velocity liquid flow applications where standard flappers may not respond. Uni-directional, horizontal or vertical upward installation.
Sizes
1/2" – 16" (ANSI 150# flanges)
Pressure
285 PSI @ -20 to 100°F
Temperature
Up to 500°F (material dependent)
Body
Carbon Steel standard; 316 SS, Bronze, 316L SS, Alloy 20, Hastelloy available
Glass
Tempered borosilicate glass
Indicator
Ultralight PTFE Indicator with 316 Mount (uni-directional)
High Pressure Flanged Models — Class 300 / 600 / 900 / 1500
1/2" – 8" · Up to 3750 psig (Class 1500) · Engineered per ASME B31.1 & B31.3
Orientation: Horizontal or Vertical
Bi-directional plain sight flow indicator for high-pressure flanged service. Used to observe presence or absence of fluid, color, clarity, and air entrainment. Non-rotor models allow unrestricted flow.
Sizes
1/2" – 8" (CL300/600 integrally cast up to 4")
Pressure
CL300: 750 psig · CL600: 1500 psig · CL900: 2250 psig · CL1500: 3750 psig
Temperature
Up to 750°F (material dependent)
Body
Carbon Steel standard; 316 SS, Bronze, 316L SS, Alloy 20, Hastelloy available
Glass
Tempered borosilicate glass (heavy duty)
Indicator
None / Plain (bi-directional)
Orientation: Horizontal or Vertical Upward
316SS hinged weighted flapper with 316 pin. Flow changes indicated by flapper position. Optimal for horizontal or vertically upward flows in high-pressure service.
Sizes
1/2" – 8" (CL300/600 integrally cast up to 4")
Pressure
CL300: 750 psig · CL600: 1500 psig · CL900: 2250 psig · CL1500: 3750 psig
Temperature
Up to 750°F (material dependent)
Body
Carbon Steel standard; 316 SS, Bronze, 316L SS, Alloy 20, Hastelloy available
Glass
Tempered borosilicate glass (heavy duty)
Indicator
316 Weighted Flapper with 316 Pin (uni-directional)
Orientation: Horizontal or Vertical
PTFE rotor with 316 pin indicates relative process velocity by rotation speed. Bi-directional, any orientation. Ideal for opaque liquids or heavy gases.
Sizes
1/2" – 8" (CL300/600 integrally cast up to 4")
Pressure
CL300: 750 psig · CL600: 1500 psig · CL900: 2250 psig · CL1500: 3750 psig
Temperature
Up to 750°F (material dependent)
Body
Carbon Steel standard; 316 SS, Bronze, 316L SS, Alloy 20, Hastelloy available
Glass
Tempered borosilicate glass (heavy duty)
Indicator
PTFE Rotor with 316 Pin (bi-directional)
Orientation: Vertical Downward or Horizontal
316 drip tube for condensate and partially filled lines in high-pressure service. Uni-directional, vertical downward or horizontal.
Sizes
1/2" – 8" (CL300/600 integrally cast up to 4")
Pressure
CL300: 750 psig · CL600: 1500 psig · CL900: 2250 psig · CL1500: 3750 psig
Temperature
Up to 750°F (material dependent)
Body
Carbon Steel standard; 316 SS, Bronze, 316L SS, Alloy 20, Hastelloy available
Glass
Tempered borosilicate glass (heavy duty)
Indicator
316 Drip Tube (uni-directional)
Orientation: Horizontal or Vertical Upward
Ultralight PTFE indicator with 316 mount for gas flow and low velocity liquid flow in high-pressure flanged service. Uni-directional, horizontal or vertical upward.
Sizes
1/2" – 8" (CL300/600 integrally cast up to 4")
Pressure
CL300: 750 psig · CL600: 1500 psig · CL900: 2250 psig · CL1500: 3750 psig
Temperature
Up to 750°F (material dependent)
Body
Carbon Steel standard; 316 SS, Bronze, 316L SS, Alloy 20, Hastelloy available
Glass
Tempered borosilicate glass (heavy duty)
Indicator
Ultralight PTFE Indicator with 316 Mount (uni-directional)
Pressure-Temperature Ratings — Carbon Steel Body
| Class | Max Pressure | 100°F | 300°F | 500°F | 750°F | Reference |
|---|---|---|---|---|---|---|
| 150# | 285 PSI | 285 PSI | 230 PSI | 170 PSI | 105 PSI | ANSI B16.5 P-T curve |
| 300# | 740 PSI | 740 PSI | 600 PSI | 445 PSI | 280 PSI | ANSI B16.5 P-T curve |
| 600# | 1480 PSI | 1480 PSI | 1200 PSI | 890 PSI | 570 PSI | ANSI B16.5 P-T curve |
| Class 900 | 2250 psig | 2250 psig | — | — | — | Consult factory for full P-T curve |
| Class 1500 | 3750 psig | 3750 psig | — | — | — | Consult factory for full P-T curve |
Ratings shown for carbon steel body per ANSI B16.5. 316 SS bodies follow the 316 SS P-T curve. Consult factory for Alloy 20, Hastelloy, or Monel ratings. All units hydrotested prior to shipment.
Size Codes — 150# Series
| Size | Code |
|---|---|
| 1/2" | 08 |
| 3/4" | 10 |
| 1" | 12 |
| 1-1/2" | 16 |
| 2" | 18 |
| 2-1/2" | 20 |
| 3" | 22 |
| 4" | 24 |
| 6" | 28 |
| 8" | 30 |
| 10" | 32 |
| 12" | 34 |
| 14" | 36 |
| 16" | 38 |
Size Codes — High Pressure Series
| Size | Code |
|---|---|
| 1/2" | 08 |
| 3/4" | 10 |
| 1" | 12 |
| 1-1/2" | 16 |
| 2" | 18 |
| 2-1/2" | 20 |
| 3" | 22 |
| 4" | 24 |
| 6" | 28 |
| 8" | 30 |
Materials of Construction
Body Materials
| Material | Code | Avail. |
|---|---|---|
| Carbon Steel (WCB)— Standard; NACE MR0175 compliant | C | ✓ |
| 316 SS (CF8M) | S | Option |
| Bronze (B61) | B | Option |
| 316L SS (CF3M) | 6L | Option |
| Hastelloy C— Consult factory | HC | Option |
| Alloy 20— Consult factory | A | Option |
| Monel— Consult factory | M | Option |
Window Seal / Gasket Materials
| Material | Avail. |
|---|---|
| PTFE (Teflon)— Standard on all models | ✓ |
| Buna-N | Option |
| Viton | Option |
| Neoprene | Option |
| Spiral Wound (SS/Graphite)— For high-temp / high-pressure service | Option |
| Kalrez— Consult factory | Option |
Body Machining Options
| Code | Description |
|---|---|
| 1 | Standard ASME Flange |
| 2 | PFA Lined Body |
| 3 | Body w/ 1/2" Coupling |
| 4 | Body w/ 3/4" Coupling |
| 5 | Body w/ 1" Coupling |
| W | 3-Way (150# only) |
Indicator wetted parts (flapper, drip tube, rotor) are 316 SS or PTFE as noted per model. All metals are ASTM listed. Units meet NACE MR0175 / ISO 15156-1 requirements. Flanges drilled per ANSI B16.5, B16.24, and B16.1.
How to Order — ANSI 150# Model Code
Example: 910-FA-18-S-1-V-PH = Flapper, 2" (code 18), 316 SS body, Std ASME flange, Viton seal, Phaeton LED.
| Pos. | Field | Options |
|---|---|---|
| 1 | Model / Indicator Type | 608-FA (Drip) · 910-FA (Flapper) · 910-FA(NF) (Plain) · 935-FA (Rotor) · 910-FA-GI (Gas Indicator) |
| 2 | Size Code | 08 (1/2") · 10 (3/4") · 12 (1") · 16 (1-1/2") · 18 (2") · 20 (2-1/2") · 22 (3") · 24 (4") · 28 (6") · 30 (8") · 32 (10") · 34 (12") · 36 (14") · 38 (16") |
| 3 | Body Material | C = Carbon Steel (std) · S = 316 SS · B = Bronze · 6L = 316L SS · HC = Hastelloy C · A = Alloy 20 · M = Monel |
| 4 | Body Machining | 1 = Std ASME Flange · 2 = PFA Lined · 3 = w/ 1/2" Coupling · 4 = w/ 3/4" Coupling · 5 = w/ 1" Coupling · W = 3-Way |
| 5 | Seal / Gasket Material | T = PTFE (std) · B = Buna-N · V = Viton · N = Neoprene · SW = Spiral Wound |
| 6 | Lighting (optional) | PH = Phaeton LED · omit if not required |
How to Order — High Pressure (Class 300–1500) Model Code
Example: F-910HPA-600-18-S-1-PH = Flapper, Class 600, 2" (code 18), 316 SS body, Std ASME flange, Phaeton LED.
| Pos. | Field | Options |
|---|---|---|
| 1 | Model / Indicator Type | F-608HPA (Drip) · F-910HPA (Flapper) · F-910HPA(NF) (Plain) · F-960HPA (Rotor) · F-910HPA-GI (Gas Indicator) |
| 2 | Pressure Class | 300 · 600 · 900 · 1500 |
| 3 | Size Code | 08 (1/2") · 10 (3/4") · 12 (1") · 16 (1-1/2") · 18 (2") · 20 (2-1/2") · 22 (3") · 24 (4") · 28 (6") · 30 (8") |
| 4 | Body Material | C = Carbon Steel · S = 316 SS · B = Bronze · 6 = 316L SS · H = Hastelloy C · A = Alloy 20 · M = Monel |
| 5 | Body Machining | 1 = Std ASME Flange · 2 = PFA Lined · 3 = w/ 1/2" Coupling · 4 = w/ 3/4" Coupling · 5 = w/ 1" Coupling |
| 6 | Lighting (optional) | PH = Phaeton LED · omit if not required |
Contact Northeast Controls for special alloys, non-standard flange drillings, raised face vs. flat face, ring-type joint (RTJ) flanges, or service conditions requiring factory review.
Typical Applications
Steam Lines
Monitor steam flow in power generation, process heating, and utility distribution systems.
Chemical Processing
Verify flow of acids, caustics, and solvents in ANSI-flanged piping per ASME B31.3.
Oil & Gas
Confirm flow of crude, condensate, and produced water in upstream and midstream applications.
Cooling Water
Detect flow in heat exchanger and cooling tower circuits where flanged connections are required.
High-Pressure Hydraulics
Class 300–1500 models for hydraulic and high-pressure process lines up to 3750 psig.
Lubrication Systems
Confirm lube oil flow to bearings, compressors, and rotating equipment.
Condensate Lines
Drip-type models for condensate and partially filled lines in vertical downward or horizontal runs.
Food Service
Sanitary-compatible materials available for food and beverage process lines.
Flanged bulls-eye sight flow indicator sales
Contact us for model selection, flange drilling, materials, and special requirements.
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