Principle - The Kurz Mass Flow Meters uses the well proven Kurz thermal convection mass flow measurement method by detecting the heat transfer from the heated RTD sensor (Rp) referenced to the temperature of the ambient gas stream RTD sensor (Rt). A constant temperature difference between the heated sensor and the temperature sensor is maintained by a modified. Wheatstone Bridge circuit in which the heated sensor is the controlled element.
This provides unexcelled speed of response and the many other advantages of constant temperature thermal anemometry. The microprocessor-based electronics measures the heat transfer, computes the standard velocity and ambient gas temperature, and allows the user to configure and set-up and the flow meter to fit all flow requirements. Display screens are east-to-use and provide all the flow, temperature and diagnostic information.
Kurz was the first to develop all-welded dual-sting sensors that have the following important features :
Kurz offers three types of thermal mass flow elements :
These are generally used for small pipes and situations in which a higher accuracy required. These are designed to include the proper upstream and down stream dimensions, screens and nozzles as appropriate, so that the mass velocity profile within the in-line flow element is flat and invariant.
The velocity at the point in a duct or stack in which they are inserted. Therefore, the user's duct serves as the flow body and the output is dependent on the relationship between the average velocity and the measurement location velocity. For pipes larger than about 2-1/2 inches, a single point insertion mass flow element is generally used because of its simplicity and lower cost. These units are very attractive as they can easily be inserted under flowing conditions.
Are used in larger ducts in which each sensor is placed at an equal area location in the duct, pipe or stack.
The Kurz Series 155 Mass Flow Computers operate most Kurz products. The microprocessor serves as a flow computer incorporating the sensor calibration, duct area, sensor diagnostics, display, outputs, variable velocity correction factors, redundancy, etc.