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Glass Fiber Optics Fiber Systems PHOTOELECTRICS Glass Fiber Optics Specifications Construction Combination of optical glass fiber, stainless steel or PVC, brass, molded thermoplastics, and optical-grade epoxy. Optical fiber is F2 core, EN1 clad, approx. 50 µm diameter per strand. Flexible steel interlock sheathing is 302 stainless. Sensing Range Refer to the specific fiber optic to be used. Bend Radius Inside bend radius must b 12 mm or greater for PVC covered fiber optic assemblies, and 25 mm or greater for stainless steel armored cable covered fibers. Length Standard length for assemblies is 915 mm; see dimension diagrams.Most models are available from the factory with shorter or longer cable lengths, up to 18 m max. Length Dimension ToleranceOverall assembly length: ±12 mm per 300 mm of length Shrink junction dimensions: ±12 mm Implied Dimensional TolerancesAll dimensions are in millimeters: x = ±2.5 mm, x.x = ±0.25 mm and x.xx = ±0.12 mm, unless specified. Operating Conditions Fiber assemblies with stainless-steel (SS) sheathing and metal end tips: -140° to +249° CFiber assemblies with PVC sheathing and/or plastic end tips: -40° to +105° C
Special order assemblies with SS sheathing and metal end tips and model suffix “M600”: -140° to +315° C* Special order assemblies with SS sheathing and metal end tips and model suffix “M900”: -140° to +480° C*;
note dimensional changes from STD models * sensing end tip only ! A PPLICATION N OTES AND W ARNINGS ! The ends of glass fiber optic assemblies are optically ground and polished. Care taken in this manufacturing process accounts for the light coupling efficiency of the fiber optic assembly. As a result, glass fiber assemblies cannot be shortened, spliced, or otherwise modified. Use caution when applying fiber optics in hazardous locations. Although fiber optic assemblies are, by themselves, intrinsically safe, the sensor and associated electronics must be LOCATED IN A SAFE ENVIRONMENT. Alternatively, fiber optics may be used with sensor model SMI912FQD (page 32). This sensor is approved for use inside hazardous areas when used with an appropriate intrinsic barrier. Also, see NAMUR sensor models Q45AD9F (page 152) and MIAD9F (page 86). Fiber optics do not necessarily provide a hermetic industrial seal between a hazardous environment and the safe environment. In applications where glass fibers to insulate the control from high voltage, specify silicone rubber, Teflon 1 2 3 ® , or high-density polyethylene sheathing with no reinforcing wire in the cable. It is the responsibility of the user to test each fiber optic assembly for insulation capacity. Do not subject the fibers to sharp bends, pinching, repeated flexing or high levels of radiation.
When ordering fiber lengths in excess of 1 m, take into account light signal reduction of 5 percent per 300 mm of additional length. 4 5 More information online at bannerengineering.com 199
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