High-Temperature Hotplate Stirrer

What is the High-Temperature Hotplate Stirrer?

A high-temperature hotplate stirrer reaches plate temperatures of around 500–550 °C with a strong heater and a ceramic plate while still stirring magnetically. It is used for high-boiling solvents, melt reactions, sample digestion and evaporation of difficult matrices.

Overview

High-temperature models raise heating power to 1,000 to 2,000 W and use a glass-ceramic or special ceramic plate with insulation around the electronics to cope with plate temperatures up to 550 °C. The magnetic drive is thermally isolated, using a large air gap and strong neodymium or samarium-cobalt magnets, since ordinary magnets lose strength at high temperature. Stirring speeds are typically 100 to 1,500 rpm for volumes up to 5 to 10 L. Models include over-temperature limit circuits, dual sensors, residual-heat warning lights and a cool-down fan. Stirring at very high plate temperatures needs care with bar material, since PTFE degrades above roughly 260 °C. Users often pair the plate with glass or metal bars and heating blocks or oil and sand baths.

How does it work?

A hotplate stirrer has an electrical heating element, typically a resistive coil or film, bonded to a plate of aluminum, ceramic or glass-ceramic, with a magnet drive below it for stirring. A temperature sensor in the plate, or an external PT1000 probe placed in the liquid, feeds a controller that regulates power by PID or on-off control. External probe control is more accurate because the liquid temperature, not the plate, is held at the set point, which avoids overshoot and overheating. A separate safety circuit, typically a bimetal switch or independent electronic limit, cuts power if plate temperature exceeds a fixed value. Plate material affects heat distribution and chemical resistance: aluminum heats evenly and quickly, ceramic resists corrosion, and glass-ceramic is easy to clean. Residual-heat indicators warn users that the plate remains hot after switching off.

What are the key features?

• Plate temperature up to 550 °C with 1,000–2,000 W heater
• Thermally isolated magnetic drive with high-temperature magnets
• Dual temperature sensors and independent over-temperature limit
• Cool-down fan and residual-heat warning light
• Insulated electronics housing for continuous high-temperature operation
• Compatible with heating blocks, oil baths and sand baths

What are the technical specifications?

A typical high-temperature hotplate stirrer configuration offers max plate temperature of 550 °C, heating power of 1,000–2,000 W, plate diameter of 135–180 mm, plate material of Glass-ceramic or special ceramic, stirring speed of 100–1,500 rpm and max stirring volume (water) of 5–10 L. 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 High-Temperature Hotplate Stirrer is used in heating high-boiling solvents, melt and fusion reactions, wet digestion of samples, evaporation of difficult matrices and sand-bath and oil-bath heating. Across the wider Hotplate Stirrers class, laboratories also deploy it for heated dissolution of solids, synthesis under controlled temperature and solvent evaporation in beakers.

Which standards and certifications apply?

Relevant standards and methods include IEC 61010-1, IEC 61010-2-010, IEC 61326-1, GB 4793.1, GB 4793.9 and ISO 9001. Certification candidates for this model are CE, RoHS 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.

Use the unit on a heat-resistant, level surface and keep flammable materials away from the plate. Never heat a sealed vessel. Avoid spills on hot plates, since thermal shock can crack glass-ceramic and corrosive spills damage coatings. Place the external probe in the liquid, not touching the vessel wall, and use a probe clamp or holder. Do not exceed the rated temperature and confirm that the independent safety cut-out works during periodic inspection. Allow plates to cool fully before cleaning. Verify temperature with a calibrated thermometer periodically and record the result. For electrical safety refer to IEC 61010-1 and IEC 61010-2-010, and for hazardous solvents consider the fume-hood airflow and ignition sources.

How do I select the right High-Temperature Hotplate Stirrer?

Select the high-temperature model when work regularly exceeds 300 °C or needs rapid heat-up for high-boiling media. Standard models suit temperatures below 300 °C at lower cost. Specify maximum temperature, heater power, bar material, baths to be used and safety features in your RFQ. Confirm that stirring bars and vessels tolerate the temperature you plan to use.

How does it compare with other Hotplate Stirrers variants?

Choose the plate material and maximum temperature first: aluminum for even heating up to about 380 °C, ceramic or glass-ceramic for corrosion resistance and up to 500 to 550 °C, and stainless steel where mechanical strength is needed. Decide whether plate-only control is sufficient or an external PT1000 probe with PID is needed for accurate liquid temperature. Check the independent safety circuit and its cut-out value, which matters when working with flammable solvents. Match plate diameter to vessel size, typically 135 to 200 mm for beakers and flasks, and confirm maximum stirring volume and speed range. Consider digital display, interface, hood compatibility and whether the housing is spark-free or has sealed controls. For temperature-sensitive samples choose a model with low overshoot and tested accuracy. Specify voltage and plug type.