Jacoby Tarbox — Sight Flow Indicators
Models 850-S, 830-F & 4000-S
Specialty · Flanged · High-Pressure · Heavy-Duty Severe Service
Specialty Sight Flow Indicator Models
Specialty models for applications outside standard product lines — unusual pressure/temperature requirements, severe chemical service, or custom configurations. Includes 850-S (full-view tubular), 830-F (flanged full-view), F-830HP (high-pressure flanged full-view), and 4000-S (sanitary full-view).
These specialty models address applications that fall outside the standard product lines — whether due to unusual pressure/temperature requirements, severe chemical service, or the need for custom configurations. Contact NCI with your specific process conditions for model selection and configuration guidance.
Model 850-S
Specialty Sight Flow Indicator
The Model 850-S is a specialty sight flow indicator designed for demanding process applications where standard models are not suitable. Features a heavy-duty body construction with reinforced glass retention and enhanced seal design. Available in a wide range of body materials and lining options. The 850-S is frequently specified for chemical processing, refinery, and petrochemical applications where reliability and long service life are critical.
Sizes
1/2" – 6"
Connection
NPT threaded or ANSI flanged
Pressure
Up to 300 PSI (connection and material dependent)
Temperature
Up to 500°F (material dependent)
Body Materials
Carbon Steel, 316 SS, Alloy 20, Hastelloy, Monel
Model 830-F / F-830HP
Flanged Sight Flow Indicator / High-Pressure Version
The Model 830-F is a flanged sight flow indicator for general process service. The F-830HP is the high-pressure version, rated for elevated pressure service. Both models feature a robust flanged body with a large viewing window for maximum visibility. The HP version uses a thicker glass disc and heavier body construction to achieve higher pressure ratings.
Sizes
1/2" – 8"
Connection
ANSI flanged (150# standard; 300# and 600# for HP)
Pressure
285 PSI @ 100°F (150#); higher for HP version
Temperature
Up to 750°F (material and class dependent)
Body Materials
Carbon Steel, 316 SS, Alloy 20, Hastelloy
Model 4000-S
Heavy-Duty Severe Service Sight Flow Indicator
The Model 4000-S is Jacoby Tarbox's heavy-duty sight flow indicator for severe service conditions. Designed for applications involving high pressures, high temperatures, corrosive fluids, or combinations of these factors that exceed the capabilities of standard product lines. The 4000-S features extra-heavy body walls, a robust glass retention system, and is available in virtually any material combination.
Sizes
1/2" – 12" (custom sizes available)
Connection
ANSI flanged (any class); NPT threaded
Pressure
Custom rated — contact for specific requirements
Temperature
Custom rated — contact for specific requirements
Body Materials
Any material — Carbon Steel, SS, Alloy 20, Hastelloy, Inconel, Monel, Duplex SS
Specialty model sales & application engineering
Provide your process conditions and we'll recommend the right model and configuration.
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