METHOD FOR SUPPLYING SAMPLE TO MOISTURE MEASURING EQUIPMENT

• Main Authors: KATOU HIROMASA, TANAKA MASUKO, HATAKEYAMA FUMIO
• Format: Patent
• Language: English
• Published: 21.04.1995
• Edition: 6
• Subjects: INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIRCHEMICAL OR PHYSICAL PROPERTIES; MEASURING; PERFORMING OPERATIONS; PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL; PHYSICS; SEPARATION; TESTING; TRANSPORTING

PURPOSE:To enhance accuracy in the measurement of moisture by drying the carrier gas using an electrolytically regenerative phosphorus pentoxide dehydrator thereby dehydrating the carrier gas reliably for a long term. CONSTITUTION:Phosphorus pentoxide(P2O5) absorbs water(H2O) to produce metaphosphoric acid(2HPO3) which returns back to phosphorus pentoxide through electrolysis upon application of voltage (2HPO3 H2+1/202+P2O5). When a flow rate of gas in the range of 100-500ml/min is required, two platinum wires and two copper wires having diameter in the range of 0.1-1mm are wound alternately around a copper pipe of 1.2-2.0mm. It is then inserted into a glass pipe and secured to the inner wall thereof by heating and then copper is dissolved into a nitric acid solution thus leaving only platinum. Two platinum wires, spaced apart from each other, are employed as anode 32 and cathode 33 which are fed with P2O2 solution and dried. A voltage of 5-90V is then applied to cause electrolysis for forming a thin film of P2O5 between the electrodes 32, 33 thus providing a regenerative dehydrator. This constitution allows easy removal of moisture from carrier gas for a long term.