Termogravimetria reprezintă o metodă standard pentru analiza materialelor organice, anorganice și sintetice. În general, analiza termogravimetrică presupune măsurarea pierderii în greutate în timpul prelucrării la o anumită temperatură sau proces de încălzire definite de utilizator.
ELTRA TGA analyzers are an ideal alternative to standard laboratory ovens and muffle furnaces for thermogravimetric analysis. Thanks to a programmable furnace that is connected to an integrated balance, heating and weighing are combined in one instrument. This saves time-consuming manual work and allows for high sample throughput. In addition, typical parameters such as moisture, ash and volatiles can be determined in one analysis run.
The TGA Thermostep processes up to 19 different samples, typically weighing between 500 mg and 5 g, in one analysis cycle. The surrounding atmosphere and temperature of up to 1,000 °C within the heating chamber can be freely defined by the user during analysis to create a standard operating procedure. The crucible lids, covering of the samples, can be raised or lowered at each stage of the analysis, thus allowing for safe and ASTM-compliant determination of volatiles in coal samples.
The TGA Thermostep is a powerful thermogravimetric analyzer characterized by robust design, high precision and flexibility. It is possible to apply different atmospheres and to use sample weights of up to 5 g. The Thermostep reliably and efficiently measures parameters such as moisture, ash and volatiles according to a user-defined SOP.
Operation of the TGA Thermostep is simple, convenient and safe. After selecting the Standard Operating Procedure (SOP) in the PC, the sample ID’s can be entered into the software. The samples are then weighed in the crucible at the position assigned to the sample ID in the carousel. After one sample has been weighed, the carousel automatically rotates to the next position and the next registered sample can then be weighed in the crucible. Alternatively, a carousel filled with samples which has been weighed externally, can be placed into the analyzer.
It is also possible to position a second carousel with crucible lids above the crucibles. Once the analysis is finished, a new cycle can be started after a short cool-down period.
Weighing the sample
Option: Crucible lids
Display of analysis results
The ELTRA TGA Thermostep software provides all necessary features for a fast, easy, safe and reliable thermogravimetric analysis.
The TGA software can provide different content of the TGA measurement
The results table displays the current available measurement data.
For a better overview on the current analysis status, the user can create an own layout of the screen
Due to the flexible application management the TGA Thermostep can measure TGA parameters in many samples like coal , cărbune bituminos, materiale de construcţii, alimente ...
The TGA Thermostep can determine the parameter moisture, volatile and ash in one analysis cycle due the automatic placing and removing of lids. The TGA is compliant to ASTM D 7582.
Building materials require the measurement of moisture and loss on ignition (LOI). The LOI can indicate the presence of organic matter or carbonates.
Some foods like pet foods, biscuits, or milk require the measurement of dry mass and ash content. Due to the encapsuled weighing cell even the ash content of fluor could be measured safe and precise.
| Elemente măsurate | conținut de cenușă, substanţe volatile, umiditate |
| Probe | anorganic, organic, sintetic |
| Domeniul de aplicare | agricultură, biologie, chimie / mase plastice, cărbune / centrale electrice, geologie / exploatare minieră, materiale de construcţii, medicină / farmacie, mediu / reciclare, produse alimentare, sticlă / ceramică |
| Cuptor | cuptor de rezistență cu încălzire ceramică, programabil în trepte de la 1º C la 50º C până la 1000º C |
| Metoda de detecție | balanță |
| Numărul maxim de probe | 19 creuzete + 1 creuzet de referință |
| Rezoluția cântarului | 0.0001 g |
| Precizia cântarului | 0.02 % RSD |
| Gaze necesare | în funcţie de de aplicaţie: oxigen pur 99,9% (2-4 bar) și, sau 99,9% azot pur (2-4 bar) şi aer 99,5% (5-6 bar) |
| Alimentare | 230 V, 50/60 Hz, max. 32 A |
| Dimensiuni (W x H x D) | 55 x 52 x 62 cm |
| Greutate | ~ 65 kg |
| Echipament necesar | PC, monitor, external exhaust (exhaust diameter: 100 mm / blower with 4m-3/min) |
Operarea analizorului TGA Thermostep este simplă și comodă. Procesul de măsurare trebuie definit o dată, în ceea ce privește temperaturile utilizate, atmosferele și intervalele de încălzire. Pentru a începe analiza, un proces predefinit trebuie ales în software, iar proba trebuie cântărită în creuzet. Toate etapele următoare sunt procesate automat. Prelucrarea tuturor datelor, controlul procesului de măsurare și calcularea rezultatului sunt realizate de un PC extern cu software Windows®. Procesul de determinare a umidității, conținutului de substanțe volatile și conţinutului de cenușă are nevoie de aproximativ 4 ore.
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