Tube Sample Loader with Integrated Vortex Mixer

What is the Tube Sample Loader with Integrated Vortex Mixer?

A tube sample loader with integrated vortex mixer vortexes each tube immediately before aspiration so that settled or clumped cells are fully resuspended. It is used for long unattended runs, dense cell suspensions and stem cell or whole blood assays where sedimentation would bias counts.

Overview

This loader combines a tube handling mechanism with a dedicated vortex station. Each tube is gripped by a robotic arm, lifted from a rack, vortexed at a programmable speed, typically 500 to 2,500 rpm for 1 to 10 seconds, and then presented to the sample probe. By mixing directly before sampling rather than at fixed intervals, the loader keeps cell concentration and composition consistent across a long run, which is critical for absolute counting and for samples such as whole blood, bone marrow or cultured cells that settle quickly. Racks of 20 to 60 tubes can be loaded, and the gripper accepts multiple tube diameters. Mixing parameters can be defined per tube type, and foaming is managed by speed and time limits. The mechanism is more complex than a carousel and has more moving parts to maintain.

How does it work?

A sample loader positions a container under or beside the cytometer's sample injection probe using a motorized carousel, rack or X-Y-Z robotic arm. The probe descends into the tube or well, often after a programmed mixing step by vortexing, pipette aspiration or orbital shaking, and aspirates a defined volume with a syringe pump or pneumatic metering system. The sample is delivered to the flow cell, and the probe exterior and interior are rinsed with sheath or wash solution in a wash station to limit carry-over. Liquid-level sensors and pressure monitoring detect empty wells or clogs. Software sequences the run order, synchronizes acquisition with the cytometer, and writes one FCS file per well with its plate position and metadata.

What are the key features?

• Dedicated vortex station mixes each tube immediately before aspiration
• Programmable vortex speed from about 500 to 2,500 rpm and duration up to 10 seconds
• Robotic gripper accepts several tube diameters from one rack
• Rack capacity of 20 to 60 tubes for long unattended runs
• Foam-limiting speed and time settings protect protein-rich and whole blood samples
• Per-tube-type mixing profiles stored in software methods

What are the technical specifications?

A typical tube sample loader with integrated vortex mixer configuration offers rack capacity of 20–60 tubes, vortex speed of 500–2,500 rpm, vortex duration of 1–10 s (programmable), tube diameters of 10–16 mm, carry-over of Below 0.5% and minimum sample volume of Approx. 200 µL. Values are indicative of the product class; the exact figures for each configuration are confirmed on the quotation and the calibration documents supplied with the instrument.

Which applications is it used for?

The Tube Sample Loader with Integrated Vortex Mixer is used in absolute CD34 and CD4 counting, whole blood and bone marrow assays, long overnight runs with settling cells, stem cell product testing and high-density culture monitoring. Across the wider Sample Loaders class, laboratories also deploy it for high-throughput drug screening, unattended clinical immunophenotyping runs and CAR-T and cell therapy in-process testing.

Which standards and certifications apply?

Relevant standards and methods include ISO 20391-1, CLSI H62, IEC 61010-1, IEC 61010-2-101, ISAC FCS 3.1 and ANSI SLAS microplate footprint (ANSI/SLAS 1-2004). Certification candidates for this model are CE, IEC 61010-1 compliance and ISO 13485 manufacturing; each is to be confirmed for the specific configuration before shipment, and certificates are supplied only where they have been issued.

Verify the loader is aligned with the cytometer probe and that the probe height and stroke are calibrated for each container type. Validate carry-over by running a high-concentration bead or cell sample followed by blanks, and confirm volume accuracy gravimetrically. Clean the wash station and replace probe tubing according to the manufacturer's schedule, using bleach or dedicated decontamination solution when biohazardous samples are run. Enable audit trail and user access control if data are used in regulated work. Plates should be sealed or covered during long runs to limit evaporation, and samples fixed or kept cold to maintain stability. Periodically check mechanical movement, and keep software and firmware versions under change control.

How do I select the right Tube Sample Loader with Integrated Vortex Mixer?

Choose a loader with integrated vortex when samples sediment quickly and long unattended runs or absolute counts demand uniform resuspension. For simple short runs a basic carousel is adequate. In an RFQ specify tube sizes, rack capacity, vortex speed range, foam handling requirements and barcode reading.

How does it compare with other Sample Loaders variants?

Select a loader by the container formats, throughput and sample type you handle. Tube carousels suit routine clinical panels with 12 to 40 tubes, while microplate samplers support 96 and 384-well screening. Check carry-over specification, typically below 0.5 percent, and the minimum sample volume and dead volume, which matter for precious samples. Confirm mixing capability, because sedimenting cells need resuspension before each draw. Consider temperature control when samples are labile, and barcode reading for chain-of-custody. Verify mechanical and software compatibility with your cytometer model and whether the loader supports walk-away operation, automatic cleaning and error recovery. Finally review the footprint and whether a biosafety cabinet placement is needed.