Used Fluid Metering FMI QG-20 Lab Pump with RH00 Low-Flow Head (1/4" Shaft)

Precision Low-Flow CeramPump Metering System for Laboratory & OEM Applications

Achieve exceptional micro-dosing precision in your laboratory or analytical systems without overextending your equipment budget. The pre-owned Fluid Metering (FMI) QG-20 Low-Flow Valveless Piston Pump, paired with the miniature RH00 RH-Series Pump Head, is designed to deliver precise, drift-free fluid dosing for demanding laboratory, analytical, and OEM process systems.

By sourcing this fully tested, used FMI metering system through HiTechTrader, research facilities and system integrators can secure high-resolution micro-dosing and extreme metering accuracy at a fraction of the cost of buying new.

Condition & Unit Details

• Condition: Fully inspected, used low-speed metering pump in excellent working condition.

• Testing: Powered on, drive mechanism and stroke adjustment scale fully tested for smooth, bidirectional operation by our technicians.

• Included Components: FMI QG-20 Low-Speed Drive module (1/4" Shaft) and RH00 RH-Series Low-Flow Pump Head.

• The HiTechTrader Guarantee: Backed by our standard 30-day limited warranty. We have been a trusted provider of high-quality used laboratory and scientific equipment since 1982.

CeramPump Valveless Piston Technology

Traditional metering pumps rely on check valves that can easily clog or fail, making them notoriously unreliable for low-flow applications. Built on FMI’s proprietary CeramPump® technology, this system uses a single precision ceramic piston rotating inside a matched ceramic cylinder to achieve positive displacement metering without check valves or bypass systems.

This elegant architecture provides drift-free volumetric metering, extremely low pulsation during fluid transfer, and minimal maintenance. Because only one component moves within the fluid path, the pump maintains highly stable flow even during continuous 24/7 operation.

RH00 Pump Head for High-Resolution Low Flow

The RH00 pump head is part of FMI’s RH-series miniature pump head family, engineered specifically for low-flow, high-precision dosing. The wetted materials—including the ceramic (or zirconia) piston, ceramic cylinder liner, and PVDF or ETFE casing—provide excellent chemical resistance and high wear durability. This makes the RH00 head ideal for micro-scale reagent delivery of aggressive or high-purity fluids at pressures up to 50 psig and temperatures up to 100 °C (212 °F).

Stable Low Flow Operation & "10-0-10" Control

The QG-20 belongs to FMI’s low-speed QG pump family, providing stable low-speed operation for precision metering. When paired with the RH00 head, it delivers a maximum flow rate of approximately 6.40 mL/min.

Flow is infinitely adjustable from zero to the maximum using FMI’s “10-0-10” stroke control scale. This allows precise micro-flow tuning. Because the design is fully reversible, operators can seamlessly change the flow direction by simply adjusting the stroke control across the zero point on the scale. Furthermore, the compact 1/4-inch shaft configuration allows the QG-20 to integrate easily into laboratory equipment, chemical feed skids, and automated instrumentation.

Technical Specifications

Nationwide Shipping & Availability

Waiting on long OEM lead times for highly specific micro-dosing pumps can stall your analytical method development. Operating out of our primary facility in Coatesville, Pennsylvania, HiTechTrader provides rapid, secure shipping to research institutions, pharmaceutical labs, and industrial OEM builders nationwide.

Whether your facility is located locally on the East Coast, in major tech and biotech hubs like Seattle, or anywhere across the globe, we ensure your used fluid processing equipment arrives safely and ready for immediate deployment.

Frequently Asked Questions (FAQ)

What is the maximum flow rate of the FMI QG-20 with an RH00 head?

This specific low-flow configuration provides a maximum flow rate of approximately 6.40 mL/min, making it ideal for micro-dosing, continuous low-flow metering, and critical analytical instrumentation.

What does the FMI "10-0-10" scale do?

The "10-0-10" linear flow control scale allows operators to infinitely adjust the piston's stroke length. Setting the scale to "10" delivers maximum flow (approx. 6.40 mL/min), while setting it closer to "0" delivers micro-liter flows. Moving the indicator past the "0" mark to the other side of the scale seamlessly reverses the fluid direction without having to stop the pump or swap tubing.

What fluids can the FMI RH00 pump head handle?

The RH00 pump head features a completely nonmetallic fluid path, typically utilizing a PVDF or ETFE body paired with a ceramic or zirconia piston and cylinder liner. This construction provides exceptional chemical resistance, allowing it to safely dose aggressive industrial solvents, harsh acids, and high-purity analytical reagents at pressures up to 50 psig.

Buy the Used FMI QG-20 Lab Pump with RH00 Head

HiTechTrader offers the pre-owned Fluid Metering Inc. QG-20 Low-Flow Valveless Piston Pump with the RH00 RH-Series Pump Head, providing laboratories and OEM system integrators with a reliable solution for precision micro-dosing and analytical fluid control.

Contact HiTechTrader today to:

• Request pricing

• Confirm exact port connections, casing materials, and tubing compatibility

• Discuss expedited shipping options to minimize your lab's downtime