P2.6 - Evaluation of Heater Temperature to Detect Gases in a Flowing Fluid
- AMA Conferences 2013
2013-05-14 - 2013-05-16
- Proceedings SENSOR 2013
- P2 - Gas Sensors
- C. Hepp, F. Krogmann - Innovative Sensor Technology IST AG, Ebnat-Kappel (Switzerland), G. Urban - University of Freiburg (Germany)
- 728 - 731
In this contribution the behavior of a calorimetric flow sensor was investigated, at which only the temperature of the heater is evaluated. A time-dependent excitation (f = 1 Hz) was applied to the heating element with a constant power amplitude. The influence of different gases and flow velocities on the heater temperature were observed. Measurements and simulations were carried out in no-flow condition and in flowing fluids in order to obtain the restrictions regarding to a simultaneous detection of flow speed and gas type. A simultaneous measurement of flow velocity and gas type was possible, however certain conditions had to be respected, e.g. a high difference in thermal conductivity which is predetermined by the flow speed range.