Thermal Dispersion
Differential Pressure
Transmitters & Controllers
Thermal Dispersion
Thermal Dispersion technology is based on the principle that the amount of heat absorbed by a fluid is proportional to its mass flow. Thermal dispersion (mass) flow measurements are achieved by using two temperature sensors and a heat source located in a flow stream. By measuring the energy (heat) added to the flow stream and measuring the corresponding temperature change, mass flow can be derived.
Thermal dispersion is a highly reliable and robust method for accurately measuring airflow velocities in today’s HVAC applications.
Product InfoDifferential Pressure
Differential Pressure technology is commonly used to measure fluid velocity due to their well-defined relationship. The square root of the differential pressure is proportional to the flow rate velocity of the fluid. In ducted systems the total pressure consists of the velocity pressure and static pressure. Velocity pressure cannot be measured directly; it must be derived. By measuring the total and static pressures in a duct, the velocity pressure can be obtained by subtracting static pressure from total pressure. This is achieved in practice by directly measuring the differential pressure between the two.
Product InfoTransmitters & Controllers
The job of a transmitter is to receive a signal and transmit it to a recipient. If the recipient is lucky, the signal will arrive exactly as it was transmitted allowing the controller, if there is one, to do its job properly. Depending on your application, high accuracy may or may not be important to you. In the HVAC world transmitter accuracy is of the upmost importance, not only because you are dealing with the air people breathe, but also because you are responsible for maintaining building health. Make sure you choose the right transmitter and/or controller for your application.
Product Info