Why does the first dose of a suspension never match the last one? A syringe pump with magnetic stirrer is a lab pump with a magnetic stirring system that turns a stirrer inside the syringe. The fluid stays mixed while the pump pushes it out. A plain pump moves liquid well. But it cannot stop solid bits from sinking during a slow run. Most teams learn this from a failed run, not from a datasheet.

This article explains the mixing problem and how the stirring works. It also covers the published figures for the DK INFUSETEK MIX60, its controls, and where this pump is used.

Why Do Suspensions Separate Inside a Syringe?

Suspensions separate inside a syringe because the solids never dissolve. Gravity pulls them down over time. A suspension is solid bits held in a liquid, not a true solution. Bigger particles sink faster. A wide density gap makes it faster too.

Slow delivery makes it worse. A 30-minute run gives the solids 30 minutes to sink. Studies on cell delivery in microfluidic work report the same problem. They point to added stirring as the usual fix.

What Settling Costs During a Long Run

Early and late doses carry different solid loads.

Repeat runs stop matching each other.

Thick deposits can build near the outlet.

Results get hard to defend in a report.

For transferring suspensions, this is the whole risk. A pump can hold flow perfectly and still send out an uneven sample.

What Does a Syringe Pump With Magnetic Stirrer Actually Do?

A syringe pump with magnetic stirrer mixes the fluid right where it leaves the barrel. No need to mix it in a beaker beforehand. The magnetic stirring system may swivel and travel in a straight line on the MIX60 Laboratory Syringe Pump from DK INFUSETEK. That motion makes the stirrer go around within the syringe. The stirrer spins back and forth so the fluid stays uniform.

Pushing and mixing take place concurrently. The stirrer is still operating, the plunger moves forward. Thus, during the whole stroke, uniform stirring within the syringe is maintained. The MIX60 is a laboratory syringe pump built on that single concept.

Core Function Summary

How Does the Stirring System Move?

Fixed Position Stirring and Reciprocating Stirring

The MIX60 features two modes of stirring. They are fixed position stirring and reciprocating stirring. In fixed position mode, the stirrer remains stationary and rotates within that fixed spot. In reciprocating stirring the stirrer also moves back and forth. It measures a stretch of the fluid, not a single zone.

One little thing makes a big difference. When the liquid level drops, the pump automatically changes the back-and-forth distance. The stirring route thus remains inside the fluid.

Why Is Adjustable Stirring Speed Useful?

The speed of stirring rotation runs from 25 to 460 rpm. Stirring pushing speed runs from 1.6 mm/s to 40 mm/s. That range arises because fluids are different. One can pump to fit a light mix or a heavy one that sinks quickly thanks to the adjustable stirring speed.

The maker does not publish a set speed for any named fluid. By trial and error, you discover it. The solids must remain spread before the speed can be increased, so start low and keep an eye on the barrel.

Why Uniform Stirring Inside Syringe Changes the Result

The MIX60 design's stated goal is even mixing at the point of delivery. Value goes up in time, not in a single pulse. Fluid that has never ceased moving produces a dosage at minute one and a dose at minute forty.

The delivery accuracy is given as Error <= ±0.3%. That applies at an instant of 30% or greater of full stroke. The figure covers volume, not mix. Never quote it as a mixing number. The fluid, mode, and speed you choose all affect the quality of mixing.

What Syringe Size and Flow Range Does the MIX60 Use?

The MIX60 uses a 10 mL syringe. A 10ml glass syringe is available for it. Flow rate runs from 0.66 μL/min to 22mL/min. Linear speed runs from 4 μm/min to 132 mm/min. Max stroke is 60 mm.

One point is often wrong online. The working mode of the MIX60 is infusion. The pump pushes fluid out. It is not listed for withdrawal. Plan the fluid path before you order.

Can the Syringe and the Stirrer Run Separately?

Yes. The syringe and the stirring system can start or stop on their own. This is a daily-use feature, not a line on a spec sheet.

You can stir without pushing. That helps while a fresh mix settles in the barrel. You can also push without stirring, which suits a clear fluid. Both jobs sit under one control panel.

Programmable Working Steps and On-Screen Control

Simple programming is built in. Up to 20 working steps can be set. Programmable working steps turn a multi-stage run into one saved routine. No manual restart between stages.

1. Set the steps, then open View Steps to check every parameter in the current setup.

2. Use calibration and online fine-tuning for tighter control of liquid volume.

3. Trust power-off memory. Settings stay after the power comes back.

Control runs through an industrial grade 4.3" LCD color display. It works by touch screen and by mechanical keypad. The keypad helps a lot when you wear gloves.

What Protection Is Built Into the Drive?

Published Protection Features

Block protection - the pump stalls and alarms if the drive gets blocked.

Sensor limit protection - the pump stops and alarms if the syringe or stirring system passes its limit point.

Linear force - rated at ≤25kgf, with online adjusting.

Input voltage - DC24V/2.5A.

These guards protect the drive and the syringe. A blocked line on a glass barrel can cost you a run and a piece of glassware.

Which Fields Use This Pump Type?

In pharmacy, biology, chemistry, and energy, the MIX60 is mentioned for transferring a variety of suspensions. Additionally, DK INFUSETEK groups their work into four areas. The four categories are life science, microfluidic, university laboratory, and electrospinning.

Those lists share a common trait. Each implies tiny volumes, extended runs, samples that lose their value as solids sink. The same corners also contribute published work on in-syringe stirring such as automated sample prep and lab-on-chip cell handling.

Plain Pump or Stirring Pump: What Really Differs?

A stirring pump earns its place when the fluid holds solids and the run is slow. For a clear solution, the extra system adds work and little else.

MIX60 Technical Parameters at a Glance

Who Builds the MIX60?

Factory Introduction

Syringe pump supplier DK INFUSETEK. Headquartered and has its R&D center in Shanghai. Its production base is located in northern China.

Focusing on One Area

The firm works on microfluid handling device design, custom builds and production. That is one field, not a whole catalogue. The portfolio includes laboratory, continuous-flow, modular, and industrial pumps, as well as accessories.

Factory Scale

The scale covers Shanghai's main office and R&D facility. It also covers the production base in northern China. The firm says it has extensive R&D expertise and is interested in serving researchers and producers.

Frequently Asked Questions

What is a syringe pump with magnetic stirrer used for?

A syringe pump with magnetic stirrer is used for transferring suspensions. The solids must stay spread out while the fluid leaves the syringe. The MIX60 is listed for pharmacy, biology, chemistry, and energy work.

Suits slow, long runs

Keeps late doses like the early ones

How does the MIX60 stir liquid inside the syringe?

With a magnetic stirring system, the MIX60 liquid stirs. The system rotates and moves in a straight line. To ensure that the fluid mixes uniformly, it causes the stirrer within the syringe to rotate and move back and forth.

Mixing in the barrel

Stirring during delivery

What stirring modes does the MIX60 support?

The MIX60 supports two modes: fixed position stirring and reciprocating stirring. As the liquid level drops the pump also reduces the back-and-forth distance by itself.

Fixed position mode spins on its axis

Reciprocating mode moves down the barrel

Can the stirrer and the syringe run separately?

Yes. The syringe and stirring system can start and stop autonomously. So you may mix before or deliver with the stirrer off.

Stir a new load before you run it

For clear fluids, avoid stirring

What syringe size does the MIX60 use?

The MIX60 uses a 10 mL syringe, and a 10 mL glass syringe is available. Flow rate covers 0.66 μL/min to 22mL/min. Max stroke is 60 mm.

Working mode is infusion

Linear speed runs 4μm/min to 132mm/min

How many working steps can be programmed?

Up to 20 working steps can be set on the MIX60. Calibration and online fine-tuning give tighter volume control. Power-off memory holds the settings after a power cut.

View Steps shows current parameters

Adjustable stirring speed is set per routine

Conclusion

Suspensions fail quietly. The pump holds its flow, the run ends, and the sample still comes out uneven. Mixing inside the barrel removes that risk.

If you move particle-loaded fluids on slow transfers, look at the MIX60 from Duko Industrial Technology (Shanghai) Co., Ltd., known as DK INFUSETEK. The fit is clear. You get two stirring modes, a 25 rpm–460 rpm range, separate control of pump and stirrer, and 20 steps in a 10 mL format. Full specs and the datasheet sit on the MIX60 product page. The sales team answers application questions through the contact page.