Precision mixing and diluting

Paul Boughton

The STH and STQ Duplex Metering Pumps from Fluid Metering Inc are suitable for precision mixing, diluting, and proportional metering for OEM medical, analytical and industrial instrumentation.

FMI’s OEM Duplex Metering Pumps consist of two FMI valveless pump heads direct coupled to a single variable stepper motor drive.

The displacement of each pump head is independently adjustable, and a variety of pump head sizes can be used in combinations to achieve dispensing ratios from 1:1 up to 500:1 from microlitres to litres.

Fluid Metering’s OEM Duplex Metering Pumps feature FMI’s CeramPump valveless piston pumping technology and are the valveless-syringe alternative to conventional syringe pumps. The CeramPump has only one moving part in the fluid path, a sapphire-hard ceramic piston, which accomplishes both pumping and valving functions, without valves.

The result is a unique valveless pump design which eliminates multiple syringes, valves, actuators, and drivers required by conventional syringe pumps for continuous fluid dispensing and metering. By eliminating valves and utilising ceramic internals, FMI OEM Duplex Pumps will dispense millions of maintenance-free cycles at ±1% precision without recalibration.

In addition, the FMI pump has unidirectional continuous flow, utilising two separate ports for input and output. Throughput of the FMI CeramPump is increased over syringe designs which both fill and dispense through the same single port.