Volumetric liquid metering device

A volumetric liquid metering device for measurement of continuous flow liquids comprising first and second meter chambers wherein each meter chamber is arranged to receive up to and including a predetermined volume of liquid;

• each meter chamber being provided with:
• an inlet conduit for directing liquid into the meter chamber wherein the ingress of liquid through the inlet conduit and into the meter chamber is controlled by a first valve mechanism;
• a means to apply negative pressure to the meter chamber to draw liquid into the meter chamber via the inlet conduit;
• a volumetric metering means to indicate when the predetermined volume of liquid has entered the meter chamber;
• a discharge conduit for discharging liquid from the meter chamber wherein the discharge of liquid from the meter chamber through the discharge conduit is controlled by a second valve mechanism, the first and second valve mechanisms being actuated in response to a signal from the volumetric metering means;
• and
• a means to apply positive pressure to the meter chamber to encourage discharge of liquid from the meter chamber via the discharge conduit;
• wherein the first meter chamber is coupled to the second meter chamber via the first and second valve mechanisms, the first and second valve mechanisms being configured such that liquid is received in the second meter chamber when liquid is discharged from the first meter chamber, and vice versa.