CONTROL DEVICE OF RECIPROCATING METERING PUMP, PUMP FACILITY, AND METHOD FOR CONTROLLING RECIPROCATING METERING PUMP

摘要

PROBLEM TO BE SOLVED: To achieve degassing from a metering pump while using the existing metering pump, and achieve a low cost of facility including the metering pump.SOLUTION: A control device 12 is used for a metering pump 11 in which a volume of a liquid chamber 25 is increased or decreased through a reciprocating motion of head 22. The control device of a reciprocating metering pump is provided with a first stroke control part 42 for instructing an amount of stroke to a stroke variable unit 24 for changing a head stroke amount so as to cause the first physical amount relating to liquid flowing in a pipe 7 connected to a discharging port 11B of the metering pump; a second stroke control part 43 for instructing the maximum stroke amount to the stroke variable unit; and a control changing-over part 44 for changing from a physical amount control mode by the first stroke control part to a degassing mode by the second stroke control part when a second physical amount relating to the liquid flowing in the pipe and varying in response to a presence/absence of gas in the metering pump becomes a state of presence of gas.