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6 years ago

Startup Temperature Problem

Has anyone had problems getting the correct start temperature for your programs?

I have a Netzsch Jupiter 449 F3 DSC. I have been running experiments in the temperature range 150C to 600C. The DSC never reaches 150C at start-up. It usually starts ~120C and my final temperature is always ~550C.

I have played games such asstarting my program at RT then adding a a ramp step to 150C. The DSC "starts at RT".By this I mean it launches your tempprogrambut itneverreaches 150C before the ramp to 600C happens. I have alsoheated the oven to 150C stopped a program, then started my 150 to 600Cprogram. The 150C drops to about 120 before the ramp to 600C starts. In all cases I get to about 550C max temp.

I realizeI can just add an extra 100 degrees to my measurements but in my past experience DSC's usually start at the temperature you tell them to.

Is this normal? Has anyone else seen this? Am I doing something wrong?

6 years agoReply from LabWrenchEditor
NEU Joe Try to use the STC option when you set up the temperature program. Then the sample temperature will follow the programmed temperature regime much better. If there is any other issue or if you need other advice, call the Netzsch Applications Laboratories in Burlington, MA. They can always help on operation or application questions.

Best regards, Juergen

Thank you to Juergen Blumm for providing this response to LabWrench

Netzsch - TG 449 F3 Jupiter®
by Netzsch

Netzsch - TG 449 F3 Jupiter®
DESCRIPTION
The thermobalance for every application - robust and upgradeable

The TG 449 F3 Jupiter® is the workhorse for thermogravimetric analyses of a moderate to high sample weights from -150°C into the high temperature range of 2000°C. The vertical design with top-loaded samples ensures total protection of the balance, which is on the bottom, through accurate flow of the purge and protective gases in a natural vertical path to the top, with optimal conditions for coupling FTIR and MS gas analysis systems to the heated furnace outlet. The TG sample carriers are always equipped with a thermocouple for direct measurement of the temperature at the sample. The high capacity of the balance along with constant resolution over the entire weighing range provide the best conditions for using the wide variety of ceramic or metallic sample crucibles and pans in different shapes and sizes. Of course, vacuum-tight construction providing for pure atmospheres goes without saying. The TG 449 F3 Jupiter® is designed for upgrading to simultaneous TG-DSC or simultaneous TGA-DTA. The TGA sample carriers can be exchanged with TGA-DSC or TGA-DTA sample carriers in a matter of seconds so that a very cost-effective upgrade can be made at any time into a full-fledged, universal STA. The TG 449 F3 Jupiter® is one of the versatile TGA systems for routine use in material research and development as well as in quality assurance – primarily in the area of inorganics.

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