Turbidity measurement appts. for turbidity and solids conc. in liquids - contains sensor head with hopper-shaped aperture contg. light sources, receivers, light scattering plates and barriers

摘要

The arrangement has a probe contg. a light source and receiver operating on the multiple beam alternating light principle. Receiver signals arising from scattering and absorption of source light in the receivers are fed to an evaluation device. At least two sources (15,16) open into the walls of a hopper-shaped recess (14) in the end of the sensor head (10). The optical axes of the sources and corresp. light receivers (17,18) are directed towards the opening of the recess. Light scattering plates (19-22) are arranged in front of each source and receiver. The receivers not currently exposed to direct source light are screened by barriers from scattered light. ADVANTAGE The arrangement eliminates the effects of stray light and associated reflections on the measurement results.