Planning Information; Areas Of Application; Measuring Principle; Figure 1: Presentation Of The Principle Of Ultrasonic Flow Measuring - MIB Flowmax 242i Operating Manual



Planning information

Flowmax 242i
1. Planning information

1.1 Areas of application

The flow measurement device in the Flowmax 242i designed to measure dynamic
flow in pipes and tubes. This flow meter is suitable for liquids only. The Flowmax
242i is used in
 Bio-processing applications
 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 242i 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
 Constant pipe cross-section over the entire measurement channel

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.

Figure 1: Presentation of the principle of ultrasonic flow measuring

6 M I B