Ovens, Furnaces & Heating Equipment


IR Hotplate/Stirrer Saves Time and Energy


The latest infrared heating technology has been used in the design of the WH260-NH hotplate-stirrer from Wiggens. Thanks to this radiation heating technology, the Wiggens WH260-NH can be used for rapid heating up of various shaped vessels, including round-bottom flasks, and the solution inside can be heated up to a maximum of 450°C in a very short time.


The new Wiggens hotplate stirrer enjoys the benefits of a Schott glass ceramic surface with exceptional chemical resistance, a high surface quality, and a resistance to temperature shocks of more than 700°C, providing the users with optimal solution compared to conventional heating surface materials. The poreless smooth surface enables even the most stubborn dirt to be easily cleaned. The high infrared permeability ensures that the heating energy is transferred quickly and with very limited loss, therefore, it heats liquids fast and saves time and energy. Intelligent Cascade Control enables self-optimising to reach perfect temperature stability. If the Pt-100 sensor is connected, temperature-controlled work with stability of +/- 2°C can be reached in most applications.


In addition to rapid heating capability and superior temperature control, the WH260-NH also offers well controlled gentle to intense mixing of liquids, and is also suitable for large volume viscous media.


The stirring and heating can be controlled separately by convenient turning knobs. All functions can be viewed and monitored on a bright touch screen, including most frequently used parameters, such as, working temperature, stirring speed, working time, and safety temperature. Memory function for stirring speed and temperature setting makes it convenient to start the experiments with fixed conditions. A residual-heat display protects the users from burning their hands.


With the aforementioned benefits, and many other features, the Wiggens hotplate stirrer is the optimal solution for heating and mixing of liquids in labs, for gentle to intense applications. More information online: ilmt.co/PL/ZkwV


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Specialised Ashing Furnaces for Laboratory Applications


Are you involved in executing the ashing process where prepared samples are heated in air until they react with the oxygen present and combust leaving residual ash of inorganic, non-combustible compounds?


Whether you are ashing to an international ISO, EN or ASTM standard or with a specific objective such as Loss on Ignition (LOI), a specialised Ashing Furnace from Carbolite Gero is the most appropriate piece of equipment in which to carry out this process.


The difference between a standard laboratory chamber furnace and an ashing furnace is primarily the supply of preheated air to promote burning. Typically, an ashing furnace is designed to promote a high level of airflow through the chamber to aid sample combustion and remove the smoke created during processing. Incomplete combustion can lead to issues as highlighted in the video.


The air is guided through the furnace insulation assembly to ensure that it is pre-heated before entering the chamber; this reduces the risk of inadvertently lowering the temperature during processing. The increased airflow also serves to carry any smoke and volatiles from the chamber out of the exhaust. An optional afterburner or thermal catalytic oxidise fitted to the exhaust can further reduce the emissions escaping into the surrounding atmosphere.


Because of the risk that exhaust fumes and volatiles emitted from samples could damage the heating elements, an ashing furnace is often fitted with silicon carbide (SiC) protection tiles that sit within the furnace chamber and provide a barrier between the samples and the heating elements.


In a smaller ashing furnace, the heating elements are wrapped around the outside of a ceramic muffle, into which samples are placed. The muffle contains the smoke and volatiles produced by the ashing process, whilst protecting the heating elements from contamination.


For tests or processes where alumina/silica dust could contaminate results, or react with the sample to produce corrosive vapours, a fused quartz chamber ashing furnace may be necessary to protect both the furnace and the process.


More information online: ilmt.co/PL/Lyad 57804pr@reply-direct.com


New Corrosion Resistant Analogue Hot Plates and Stirrers


Torrey Pines Scientific, Inc announces its new line of corrosion resistant multi-position stirring analogue hot plates and stirrers featuring 5 or 9 stirring positions making them ideal for acid digestions and working with most any corrosive solutions.


The large 12” (305 mm) square ceramic heater tops have a temperature range to 450°C. A purge port on the rear on the units is provided for purging with a positive pressure of any inert gas. Most chassis openings have been closed. This keeps corrosive vapours from getting inside the units and protects the electronics and stirrer motors.


The 5-position stirring units can stir 5-800ml beakers, and the 9-position units can stir 9-500ml beakers of corrosive aqueous solutions from 100 to 1500 rpm. Each stirring position is individually controlled.


The units measure 19” (432 mm) deep by 12.5” (318 mm) wide by 5.25” (134 mm) tall. They can support more than 50 pounds (22.6kg) on the plate surface. All controls are mounted well in forward of the heater surface to protect against accidental burns, and the units are designed to keep spills out of the chassis.


The units are available in 115VAC/60Hz, 220VAC/60Hz, and 230VAC/50Hz. They have a main AC on/off switch and are fused for safety. They are supplied with user’s manual and detachable line cord for the country of use. All units are UL, CSA and CE or equivalent rated.


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