Patent ID: 8657263

Claim:
A decontamination liquid supply device including measuring means which measures a weight of a decontamination liquid stored in decontamination liquid storing means, a decontamination liquid supply passage with a tail end portion connected to the decontamination liquid storing means and a tip end portion connected to downstream side equipment, and delivery means which is provided midway in the decontamination liquid supply passage and supplies the decontamination liquid of the decontamination liquid storing means to the downstream side equipment, and supplying the decontamination liquid of a predetermined weight to the downstream side equipment via the delivery means by measuring a weight of the decontamination liquid by the measuring means, wherein a gas supply passage for supplying: a gas is connected to the decontamination liquid supply passage at a side of the tail end portion from the delivery means, an on-off valve which opens and closes the gas supply passage is provided, control means which receives a signal from the measuring means and controls opening and closing of the on-off valve is provided, the control means stores a housed weight of the decontamination liquid which is housed in the decontamination liquid supply passage between a connection point at which the gas supply passage is connected to the decontamination liquid supply passage and the tail end portion, and when a weight of the decontamination liquid is reduced by a total value of the predetermined weight and the housed weight as a result of starting supply of the decontamination liquid to the downstream side equipment, the control means opens the on-off valve to introduce the gas to the decontamination liquid supply passage, supplies the decontamination liquid at a downstream side from the connection point to the downstream side equipment, and returns the decontamination liquid at an upstream side from the connection point to the decontamination liquid storing means.