CAP-B Series

Custom Non-Segmented Bus Bar System IR Window

The FlexIR CAP-B Series for non-segmented bus bar system is a large-format combination of infrared, visual, and ultraviolet inspection windows specifically designed for the power generation and large power user market. The bolted window design also acts as an access port for repairs, as it can be easily removed to allow the engineer access to repair the fault. Once refitted, the bus bar system can be re-energized and the repaired joint can be inspected to confirm that the repair was effective and reliability is achieved.

Unparalleled Field of View

Unlike the round infrared windows the large format IRISS CAP-B Series and custom infrared windows have a far superior field of view. The CAP-B Series has a large FOV which gives the thermographer the ability of infinite viewing angles inside the switchgear.


There is no such thing as a standard IR inspection so why should there only be a standard IR Window? IRISS is the only IR window manufacturer with solutions for unique applications.

UL Listed

Large format replacement panels like the CAP-B Series are now UL Listed replacement components (UL File E 491496). The CAP-B Series has an oversize Field of View (FOV) giving the thermographer infinite viewing angles within the bus system.


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Durable and Rugged

Polymer based IR windows are far more able to resist the mechanical stresses applied to IR window that are fitted to electrical distribution equipment. It was IRISS that first came to market with industrial grade IR windows that could meet the mandatory impact and load testing requirements of UL, CSA, IEEE, IEC, CE testing that could never be passed by any crystal based IR window.

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Patented Poly-View Optic Design

Our exclusive polymer technology is unaffected by environmental stresses, and enables visual, IR, and UV inspections across the entire Infrared spectrum. This original design is able to resist mechanical stresses and is tested and certified to meet mandatory impact/load requirements beyond the capabilities of crystal-based windows.

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Unconditional Lifetime Warranty

The IRISS Unconditional lifetime warranty is unique in the IR industry as it not only applies not only to the workmanship of the window housing but also applies to the durability and stability of the optic in the proposed environment. No other manufacturer can offer this because crystal optics will fail over time, and are only able to at best offer a limited lifetime warranty for manufacturing defects

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Fixed and Stable Transmission

Polymer based infrared windows are unaffected by the environmental and mechanical stresses that degrade the transmission of crystal-based IR windows which are fragile and hygroscopic (even when coated). The polymer IR window systems will maintain fixed and stable transmission (FAST) for the life of the installation ensuring that the temperature data collected through the IR window is accurate and reliable for the whole life of the installation.


General Specifications
Overall HeightCustomizable
Overall WidthCustomizable
IP/ NEMA Environment RatingIP65 / NEMA 4
Operating Temperature-40°C (-40°F) to 273°C (523°F)
Body MaterialPowder Coated 5052 Aluminum
Gasket MaterialUL 94 5VA TPE; -40°C (-40°F) to 273°C (523°F)
Hardware Material316 Stainless Steel
Voltage RangeAny
Automatically GroundedYes
Optic Specifications
Viewing Aperture Height15 cm (5.9 in)12.7 cm (5.0 in)15 cm (5.9 in)15 cm (5.9 in)
Viewing Aperture Width9.1 cm (3.6 in) 23.6 cm (9.3 in)39 cm (15.4 in)53 cm (20.9 in)
Optic MaterialPoly-View™ UL 746 compliant, visual, UV and IR transmissive polymer; -40°C (-40°F) to 325°C (617°F)
Optic Reinforcing Grill MaterialAluminum Reinforcing Grill (IP22/ IP2x Standard)
Inspection Capabilities and Applications
WarrantyUnconditional Lifetime Warranty

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