Abstract: A system for measuring a foreign material in a liquid, includes a sampling section, vacuum deaerators, foreign material measuring sensors. The sampling section prepares a sample liquid containing various foreign materials having particles of different sizes and numbers and a calibration standard liquid containing particles of known sizes and numbers. The vacuum deaerators deaerate gases mixed in the sample and calibration standard liquids. The sensors detect the foreign materials in the deaerated liquids. These sensors are arranged in front of the deaerators, respectively.

Abstract: A system for measuring a foreign material in a liquid, includes a sampling section, vacuum deaerators, foreign material measuring sensors. The sampling section prepares a sample liquid containing various foreign materials having particles of different sizes and numbers and a calibration standard liquid containing particles of known sizes and numbers. The vacuum deaerators deaerate gases mixed in the sample and calibration standard liquids. The sensors detect the foreign materials in the deaerated liquids. These sensors are arranged in front of the deaerators, respectively.

Abstract: Disclosed is a projection tube containing a coolant comprising a liquid mixture of ethylene glycol and water filled in the space between a phosphor screen panel and a transparent face panel which is set up at a certain distance in front thereof, wherein the coolant is incorporated with 10 ppm to 20 wt. % of an ethylene oligomer. The present projection tube is an excellent product free from a decrease in transmittance due to the coloring of the coolant in operation at a high temperature.