The sensor manufacturer introduces the new OLT liquid level switches for cost-effective optical point level detection. These sensors feature very high chemical resistance due to their TROGAMID miniature plastic housings making them suitable for a wide range of medical and industrial OEM applications. The OLT series can be used with many liquids which are not compatible with conventional polysulphone housings such as fuel, halogenated hydrocarbons (e.g. chloroform), methanol, acetone and ethyl acetate. Furthermore, TROGAMID can also be used in direct contact with food and drinking water. The optical switches use solid state technology with no moving parts to measure accurately and reliably the presence or absence of liquid in tanks, reservoirs and pipes.