Leomi 586
Insertion Thermal Mass Flow Meter
LEOMI-586 Thermal Mass (Calorimetric) Flow
Meter works on the physical principle of thermal dispersion from a heated
element to the ambient medium (example: air or gases). This is affected by the
velocity, density (temperature and pressure) and by the characteristic of the
medium. The amount of needed energy is a function of the temperature difference
?T and
the mass flow.
Gas flowing through two RTD PT-100 one
reference (T ref) and other Heater (Th). The temperature difference
(over-temperature) ?t between the reference sensor (medium
temperature) and the heater sensor is controlled constantly. As per King?s
Law, higher the mass flow rate, higher the cooling effect of the heater
sensor, thus higher the power required to maintain the differential temperature
constant. Therefore the heater power is proportional to the has mass flow rate.