The calorimetric principle

Unlike other methods of operation the calorimetric principle of FlowVision flow monitoring systems, which relies upon heat dissipation measured between two sensors, can be used to monitor the rate of flow of almost all media capable of moving through a pipeline, irrespective of their electrical conductivity, density, viscosity and contamination, and within a wide range of temperatures and pressures.

 

For accuracy of operation, calorimetric flow monitoring systems must convert a specific flow rate into a consistently equivalent voltage. To meet this requirement, FlowVision monitoring heads are equipped with two sensors, one of which is used as a temperature reference.

 

FlowVision monitoring heads are sophisticated high-precision sensors. Approximately parallel temperature response curves of the sensors are ensured by keeping the thermal contact resistances as small and constant as possible: The more parallel the temperature curves of the two sensors, the lower the temperature drift.

 

Two alternative calorimetric methods are employed in FlowVision designs:

 

CP (Constant Power) method:

The calorific power of the body is kept constant. The volume flow is determined by measuring the temperature difference between the two sensors. All FlowVision Flow Monitors are based on this method.

 

CTD (Constant Temperature Difference) method:

The temperature difference between the two sensors is kept constant. The volume flow is determined by measuring the calorific power. This principle is mostly used by the Flow Meters.

 

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