Tube Carousel Sample Loader

What is the Tube Carousel Sample Loader?

A tube carousel sample loader holds 12 to 40 standard cytometry tubes on a rotating turntable and feeds them sequentially to the cytometer probe. It is the usual choice for routine clinical and research panels where samples are prepared in tubes and moderate walk-away capacity is enough.

Overview

The tube carousel loader uses a motorized turntable with numbered positions for 12 x 75 millimeter tubes, and sometimes microcentrifuge tubes via adapters. A pneumatic or motorized arm raises each tube onto the sample probe or moves the probe into the tube, and a short vortex or agitation step can be applied to resuspend cells before acquisition. Capacity is typically 12, 24 or 40 tubes, and a full carousel can run for several hours depending on acquisition time per tube. The design is mechanically simple, robust and inexpensive, and it fits many benchtop cytometers without modification. It does not automate plate-based screening and offers limited mixing compared with dedicated plate systems. Tube identification is commonly by position, with optional barcode reading to link each tube to the sample record in a laboratory information system.

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?

• Motorized turntable with 12, 24 or 40 numbered tube positions
• Automatic vortex or agitation step resuspends cells before each draw
• Probe wash station rinses inside and outside between tubes
• Optional barcode reader links tubes to sample records
• Fits standard 12 x 75 mm tubes, with adapters for microcentrifuge tubes
• Simple mechanical design with low maintenance requirements

What are the technical specifications?

A typical tube carousel sample loader configuration offers tube capacity of 12, 24 or 40 tubes, tube format of 12 × 75 mm (5 mL); adapters for 1.5 mL, mixing method of Vortex / agitation, carry-over of Below 0.5%, minimum sample volume of Approx. 100 µL per tube and sample identification of Position or barcode (optional). 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 Carousel Sample Loader is used in routine clinical immunophenotyping panels, overnight research run batches, cell cycle and viability screening, CD34 and lymphocyte subset counting and teaching laboratories. 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 9001 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 Carousel Sample Loader?

Choose a tube carousel when workflows remain tube-based with moderate numbers of samples per day and a simple integration is preferred. For 96 or 384-well screening, select a plate sampler. In an RFQ specify carousel capacity, compatible tube sizes, cytometer model, mixing step and barcode reading requirements.

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.