Magnetic stirrer 1 L HI190M

Quick Answer: Magnetic stirrer 1 L HI190M is a compact, stirring-only magnetic stirrer for volumes up to one litre, carrying the model code Hanna Instruments uses for its small bench stirrer. The HI190M magnetic stirrer is sized to sit under a burette or beside a meter during titrations.

A Small Stirrer for Titration Benches

During a titration, each drop of titrant has to mix into the flask as soon as it lands; otherwise a local colour flash appears and fades, and the end point is overshot. Swirling by hand works, but it ties up one hand and varies from student to student. Standing the conical flask on the HI190M with a small stir bar keeps the solution moving steadily, so the student controls the burette tap with one hand and watches the colour with full attention.

The 1 L in the title is the largest volume the stirrer is meant to handle, which comfortably covers the 100 to 250 mL flasks and beakers used in most titrations. Its small footprint matters on benches already crowded with a burette stand, a wash bottle and a meter.

Hanna Instruments, which makes the HI190M, also makes pH and ion meters, and the stirrer is often used alongside them for potentiometric work. The title lists no heater and the model is a stirrer only; heated methods belong on one of the hotplate stirrers in the same range.

Specifications

Where the HI190M Is Used

• Acid-base, redox and complexometric titrations with an indicator, the flask stirred under the burette
• Potentiometric titrations, where a pH electrode reads the solution after each addition
• Keeping a sample moving while ion-selective or conductivity readings settle
• Dissolving a weighed solid in a small volume of water before it goes into a volumetric flask

Using and Caring for a Compact Stirrer

• Turn the speed control to zero before switching on, then raise it slowly so the bar picks up the field instead of jumping.
• Keep any electrode tip higher than the spinning bar and out of the vortex, so the bar cannot strike the glass bulb.
• Wipe drips off the top at once; titrants such as acids and permanganate stain or corrode if left.
• Keep bank cards, watches and balance pans away from the plate, as the drive magnet affects them.

Why Choose LabEquip

Teachers and technicians buy compact stirrers like this when every titration station needs its own stirring without giving up bench space. LabEquip supplies the HI190M within its General Lab Products range and alongside glassware such as the calibrated glass burette; share the number of stations through the contact page.

Frequently Asked Questions

Does the HI190M heat the sample?

No. It stirs only, so a titration or pH reading stays near room temperature. If warming is part of the method, use a heating magnetic stirrer instead and record the temperature.

What size stir bar should I use for titration?

Pick a bar a little shorter than the diameter of the flask base, usually 20 to 25 mm for a 250 mL conical flask. A bar that is too long knocks against the walls; one that is too short makes only a weak swirl.

Can I titrate in a conical flask on a stirrer?

Yes. A conical flask has a flat base that sits well on the plate, and its sloping walls reduce splashing as the vortex forms. Keep the speed moderate so the liquid does not climb the walls.

Can the HI190M be used for a potentiometric titration?

Yes. Stand the beaker on the stirrer, clamp the pH electrode above the bar and note the reading after each addition from the burette. Plotting pH against volume shows the equivalence point as the steepest part of the curve.

How close can the stirrer be to an analytical balance?

Keep it well away. The rotating drive magnet can disturb a sensitive balance and a magnetic stir bar attracts steel parts, so weigh the solid first and move to the stirrer afterwards.

Is the HI190M suitable for thick liquids?

It is intended for water-like solutions. Syrups, gels and suspensions with a lot of solid slow the bar or make it decouple, and they are better handled with an overhead stirrer or in smaller volumes.

Last Updated: September 2026