DigiMelt employs an integral cell phone vibrator motor to let students pack their sample without tapping them on the bench or dropping them through a long glass tube. This can lead to lots of capillaries on the floor and many broken capillaries. White LEDs are used to provide high-contrast illumination.įor many students, the melting point lab is the first time they have touched a capillary. The user can see all three capillaries easily at a comfortable distance from the instrument. Rather than forcing the student to peer through a tiny lens with poor illumination, the DigiMelt uses a large magnifier that allows plenty of eye relief. Furthermore, the microprocessor can deliver variable amounts of power to the oven, so it can quickly ramp to the starting temperature, then perform the ramp as slowly as 0.5 ☌/min. This means the students can enter a start temperature, a ramp rate, and a stop temperature and the microprocessor takes care of the rest. DigiMelt uses an RTD for feedback, so it "knows" the oven temperature.
Some student instruments use a large knob that simply throttles power to the oven without any sense of what the target temperature is. The RTD is encased inside the oven block making it virtually unbreakable. This means better accuracy on the readings, and no more mercury cleanup from broken thermometers. The student carefully observes the samples and records the melting points with a touch of a button.ĭigiMelt incorporates a platinum resistance temperature detector (RTD) instead of the usual mercury thermometer. DigiMelt rapidly heats the oven to the programmed start temperature, then ramps at the specified rate. Students learn the visual detection capillary method of melting point determination without the frustration of trying to control the oven temperature. Once the approximate melting point is known, a more appropriate plateau can be set, and a slower ramp rate used.DigiMelt is a modern, low cost, digital melting point apparatus designed specifically for the student lab. During this whole process it is important to: ensure that there is no sample on the outside of the tube before inserting it into the melting point apparatus use a sample only once as some substances chemically decompose on heating heat the sample slowly at 1-2✬/minute and perform a rapid melt with a ramp of up to 20✬/minute if the melting point is unknown. The average of the results from the three capillaries can then be reported as the melting point of the sample. For accurate melting point determinations, it is recommended that three samples of the same material are prepared in the same way and analyzed at the same time. When using the Stuart® SMP50 Automatic Digital Melting Point Apparatus it is important to prepare samples correctly. Furthermore, there is a storage compartment for unused capillaries, which includes a glass cutter to open capillaries that are closed on both ends, and an area to hold three prepared sample capillaries safely away from the heat source.”
You can take measurements, view results, save programs, set up user sign-ins, and download time-stamped videos and reports to a USB flash drive. Set-up is easy and intuitive due to the Android™ menu system. If you are unsure of the melt temperature, use the rapid ramp mode to take a fast scan of the full temperature range. Renaud Foret, Category Manager, explained some of the key attributes of this device: “The SMP50, conforms to US Pharmacopeia (USP) and GLP requirements, and can accurately identify the melting point with its’ advanced digital image processing capability. The Stuart® SMP50 Automatic Digital Melting Point Apparatus can analyze three samples simultaneously, which can be captured and displayed as a video image of the melt on a large 7” touchscreen display, either straight away or at a more convenient time. These tests are undertaken in capillary tubes. It is usual to carry out a melting point determination and check for consistency with at least a further two tests. They are often used to determine the temperature of the melting point of a substance.
Melting point apparatus are used to determine sample melt and are used for applications in pharmaceutical labs, quality control, academia, chemistry and industrial labs, particularly for the purity checking of raw materials received and compounds produced.
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