In this study, the static calibration of different heat flux sensors in radiation- and convection-based procedures are compared. First, three heat flux sensors based on different principles: ALTP (based on the Transverse Seebeck Effect), HFM8E (differential-layer device) and a TG-2000 (circular-foil gage) are calibrated in a laser-based radiation setup and compared to the manufacturers calibration. In a second step, all three heat flux sensors are compared with standard temperature-based, robust heat flux measurement techniques (coaxial thermocouple and slug-calorimeter) within a newly built convection-dominated facility based on stagnation-point measurments of an impinging hot air jet. The obtained results show measurement principle depending divergences indicating that a sensitivity transfer between a radiative calibrated sensor used in a mainly convective environment is not always possible and can lead to significant, systematic errors. By comparing the time signal behavior of temperature based heat flux measurement techniques, benefits for direct heat flux measurement techniques are detected.