The P-Range IR Window utilizes a thin film polymer optic material with a mesh backing which provides adequate IR transmission characteristics for control voltage applications.
Arc-Flash Protection
Although the P-Range IR window does provide a barrier between the thermographer and the live components, the thin film optics cannot withstand the combined pressure and temperature associated with an arc-flash. The use of polymer type IR windows must be restricted to control voltages only where there is insufficient energy to strike and maintain an electric arc.
Transmission
Infrared transmission of the P-Range IR window compared due the C-Range is poor due to the combined mesh & polymer barrier each of which degrade the IR signal, considerably.
Click here to compare image quality of crystal optics and mesh backed polymer optics
Impact
The P-Range IR window has been successfully subjected to impact tests on both the dedicated impact protection cover and on the mesh barrier when in the open position. Both tests were successful. Note, the impact test in the open position did not contact the actual polymer optic material but rather the protecting mesh.
WARNING. Thin film polymer optics are to be used on control voltage equipment only, molten projectiles can cause severe melt burns.
Click here for an image of a polymer IR window after an arc-fault type energy release
With the Hawk IR Sightglass, P-Range installed, infrared inspection of control equipment can be achieved quickly. Hawk IR can help you make sure your electrical thermography is to code!
Click here for a printable version of the P-Range page
Click here and download our “Arc-Rating Polymer optics” safety sheet
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