Boosted heated filament

Figure 4,3.1. Circuit diagram of a pyroiyser with boosted heated filament and with feedback controlled temperature.

Figure 4 Advanced boosted heated-filament pyrolyzer with thermocouple feedback. The chromel-alumel thermocouple wires d, 25 pm) attached to the nichrome ribbon have a small thermal capacity with a fast response time. When mounted on the GC, the chamber Is surrounded by a heater jacket. (Reproduced with permission from Lehrle RS, Robb JC, and Suggate R (1982) European Polymer Journals 443-461 Elsevier.)...

Some MS systems have, besides a temperature controlled probe, a heated-filament probe. This type of probe allows a more direct heating of the sample when it is deposited directly on the filament [48]. However, most of these probes still operate within common values for the current intensity and voltage and have a TRT that is longer than those used for flash pyrolysis. True flash pyrolysis using a resistively heated filament requires boosted current or boosted voltage for achieving a rapid heating (see Section 4.3), and such systems are commercially available. 

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