Operation Modes - GF U3000 V2 Betriebsanleitung

Design and function
In addition to the flow rate, a flowmeter with heat meter option measures the temperature difference between the flow and return
of the system via two PT100 temperature sensors.
The difference in temperature between the flow and the return, in combination with the volume of water that has passed through
the system, is used to calculate the energy difference in the medium.
3.5

Operation modes

The flowmeter can be set up to operate in one of four modes determined mainly by the pipe diameter and the type of transducer
set in use. The diagram below illustrates the importance of applying the correct separation distance between the transducers to
obtain the strongest signal.
3.5.1 Reflex mode
Upstream
Transducer
U
Fluid Flow
This is the mode most commonly used. The two transducers (U & D) are attached to the pipe in line with each other and the signals
passing between them are reflected by the opposite pipe wall.
The separation distance is calculated by the instrument in response to entered data concerning the pipe and fluid characteristics.
3.5.2 Reflex mode (double bounce)
U
Fluid Flow
In this mode the separation distance is calculated to give a double bounce*. This is most likely to occur if the pipe diameter is so
small that the calculated reflex mode separation distance would be impractical for the transducers in use.
3.5.3 Reflex mode (triple bounce)
U
Fluid Flow
This mode goes one step further to show a triple bounce situation. This would normally apply when working with very small pipes
relative to the transducer range in use.
14
Separation
Distance
D
Separation
Distance
D
Separation
Distance
D
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