Fibre Sensor Heads with Optical Fibre Connection are most suitable for transmission measurements of gases or passive measurements of hot steel or glass. Fibre Sensor Heads are designed with adjustable spot diameters and distances [variable d/D ratio]. Fibre Sensor Heads are offered with SMA 905 optical fibre connection and achromatic optics with AR coating. Fibre Sensor Heads with Optical Fibre Connection can be used optionally as illumination head with integrated light source.