BT23S belongs to high-temperature fiber optics. The BT23S is a diffuse mode Bifurcated Glass Fiber Assembly for use with D10, SM, SME, SMU, Q45, and QS18 series. Solves numerous challenging sensing requirements. Withstands high levels of shock and vibration. Inherently immune to extreme electrical noise. Bifurcated styles for opposed or diffuse sensing. Standard stainless steel flexible conduit sheathing.