Patent ID: 8862272

Claim:
A reagent preparation apparatus for supplying a reagent, prepared by mixing a concentrated reagent and purified water produced from water by a purified water production device including a valve configured to stop/start a supply of water into the purified water production device, to a sample measurement device for measuring a sample using the prepared reagent, the reagent preparation apparatus comprising: a reagent preparation unit comprising a purified water storage unit and a chamber, wherein the purified water storage unit is configured to store a predetermined amount of the purified water supplied from the purified water production device, and wherein the chamber is configured to mix the concentrated reagent and the purified water supplied from the purified water storage unit for preparing the reagent; and a processor, communicably connected to the purified water production device, and programmed to: transmit a start instruction for starting production of purified water to the purified water production device; and transmit a stop instruction for stopping the production of purified water to the purified water production device, wherein the processor is further programmed to control the purified water production device to continue producing the purified water until a predetermined time has elapsed from when the purified water production device starts the production of the purified water, by not transmitting the stop instruction to the purified water production device until the predetermined time has elapsed from the transmission of the start instruction, even if amount of purified water in the purified water storage unit reaches the predetermined amount, and wherein the purified water production device starts the production of purified water in response to a start instruction transmitted from the reagent preparation apparatus by opening the valve and stops the production of purified water in response to a stop instruction transmitted from the reagent preparation apparatus by closing the valve.