Description: In the article parameters and characteristics for thermal convertors type ТВБ, ДТПТ and ДТПС were described. Investigation of the time instability took place, in particular the 5 minutes instability. The model of transient process for differential thermal convertors was proposed. Experimental research data is given. The comparison of instability errors for different convertors was made.
Keywords: thermal convertor, instability, thermal transfer coefficient