Planning Information; Areas Of Application; Measuring Principle; Fig. 1: Presentation Of The Principle Of Ultrasonic Flow Measuring - MIB Flowmax 44i Operating Manual

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Flowmax 44i

1. Planning information

1. Planning information

1.1 Areas of application

The flow measurement device Flowmax 44i is designed to measure dynamic
flow in pipes and tubes. This flowmeter is suitable for liquids only. The Flowmax
44i is used in
 Chemicals supply for controlling, logistics, monitoring
 Cooling systems, logistics, monitoring
 Process equipment for control and monitoring of formulas
 Valve control for continuous release of liquid volumes
 Supply with de-ionized water
 Very dynamic liquid processes with dosing times of below 1 second
Flowmax 44i has the following features and benefits:
 No movable parts, therefore no wear
 High repeatability
 Easy to clean
 Safe operation
 Compact design
 Integrated detection of empty conduits
 Integrated dosing function with pre-set and adjustable amounts
 Chemical resistant

1.2 Measuring principle

It usually takes more energy to swim against the flow than with the flow. The
ultrasonic flow measurement is based on the phase-difference approach:
Two ultrasonic-sensors located opposite from each other alternatively
transmitting and receiving ultrasonic signals. If there is no liquid flow both
sensors receive the transmitted ultrasonic signals in the same phase, i.e.
without phase difference. If liquid is flowing there is a phase shift. It differs when
measured in direction of the flow than when measured against the direction of
the flow. This phase difference is directly proportional to the flow rate.

Fig. 1: Presentation of the principle of ultrasonic flow measuring

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