Abstract: An electromagnetic flow meter includes a measurement tube having a flange part, the flange part being configured to be coupled to a piping-side flange by a bolt fastening, a lining material configured to cover an inside of the measurement tube and an inner periphery area having a predetermined diameter of a coupling-side surface of the flange part, and an earth ring configured to be placed between the flange part and the piping-side flange. The earth ring has a ring plate part and a wall part formed along an outer periphery of the ring plate part.

Abstract: An electromagnetic flow meter includes a measurement tube having a flange part, the flange part being configured to be coupled to a piping-side flange by a bolt fastening, a lining material configured to cover an inside of the measurement tube and an inner periphery area having a predetermined diameter of a coupling-side surface of the flange part, and an earth ring configured to be placed between the flange part and the piping-side flange. The earth ring has a ring plate part and a wall part formed along an outer periphery of the ring plate part.

Abstract: A particle size of polyarylene sulfide obtained in polymerization is controlled by a process characterized in that a gaseous phase part of a reactor is cooled or heated after starting decreasing a temperature of a reaction system o an end of precipitation of polyarylene sulfide formed In an embodiment, a water content in the reaction system is 0.8 to 1.

Abstract: A particle size of potyarylene sulfide obtained in polymerization is controlled by a process characterized in that a gaseous phase part of a reactor is cooled or heated after starting decreasing a temperature of a reaction system o an end of precipitation of polyarylene sulfide formed In an embodiment, a water content in the reaction system is 0.8 to 1.7 moles per mole of the alkali metal sulfide; the gaseous phase part of the reactor is cooled in a polymerization stage to thereby condense a part of a gaseous phase in the reactor and the condensed liquid is refluxed to a liquid phase in the reactor; and the gaseous phase part is only cooled after starting decreasing the temperature of the reaction system, whereby high molecular weight polyarylene sulfide suitable for powder coating is formed, which has a weight average molecular weight of at least 30,000 and an average particle size of 50 to 80 .mu.m, wherein particles of 40 to 150 .mu.

Abstract: High molecular weight polyarylene sulfide prepared by reacting an alkali metal sulfide with a dihaloaromatic compound in an organic amide solvent, wherein a gaseous phase part of a reactor is cooled to thereby condense a part of a gaseous phase in the reactor, and the condensed liquid is refluxed to a liquid phase in the reactor. Higher molecular weight is attained by copolymerization with 0.005 to 1.5 mole percent, based on the alkali metal sulfide, of a polyhaloaromatic compound.