Battery-powered dosing device

摘要

Dosing device (100) for dispensing a specified vol″ ume of liquid, comprising an electromagnet (1 11) and being adapted to hold a pump (1 12) with a magnetisable pumping member (1 10) displaceable under the action of the electromagnet when the pump is held by the dosing device. The dosing device further comprises a portable voltage source (1 13) adapted to energize the electromagnet by repeated current pulses and to measure the current intensity at least once per pulse, thereby estimating the charge amount in each pulse, until a total charge amount corresponding to the speci″ fied volume of liquid to be dispensed has been supplied. A method including pulse-wise activation of an electromagnet actuating a pump having a magnetisable pumping member is also disclosed.

主权项

1. A method of dispensing a specified volume (Vtot) of liquid using a pump comprising the steps of:
(i) defining a total charge amount (Qtot) corresponding to the specified volume of liquid; (ii) providing a pulse from a portable voltage source to an electromagnet, wherein the pulse energizes the electromagnet to displace a magnetisable pumping member of the pump; (iii) measuring at least one current value (Im,n) of the pulse; (iv) estimating a supplied charge amount (Qm) supplied to the electromagnet by the pulse, based on the at least one current value; (v) determining an accumulated charge amount (Q), based on the supplied charge amount (Qm); and (vi) repeating steps (ii), (iii), (iv), and (v) until the accumulated charge amount (Qm) is greater than or equal to the total charge amount (Qtot).