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APPLICATION INFORMATION
The PORTAFLOW 216 is a Transit Time ultrasonic flow meter. It has been designed to work with Clamp On
transducers, thus enabling flowing liquid within a closed pipe to be measured accurately without the need for any
mechanical parts to be inserted either through the pipe wall or protrude into the flow system.
The meter is controlled by a micro-processor containing a wide range of data which enables the instrument to measure
flow in any pipe diameter from 50mm bore up to 400mm, made from any pipe material, over a wide range of operating
temperatures.
The system operates as follows:
Figure 6 :-
Reflex mode
Figure 7:-
Diagonal mode
When ultrasound is transmitted from Transducer ‘A’ to Transducer ‘B’ (REFLEX MODE-Figure 6) or Transducer ‘A’
to ‘B’ (DIAGONAL MODE- Figure 7) the speed at which the sound travels through the liquid is accelerated slightly by
the velocity of the liquid. If sound is transmitted in the opposite direction from ‘B’ to ‘A’, it is decelerated against the
flow of the liquid. The differences in time taken to travel the same distance in opposite directions are directly
proportional to the flow velocity of the liquid.
Having measured the flow velocity and knowing the pipe cross-sectional area, the volumetric flow can be easily
calculated. The Microprocessor will determine the correct alignment of each transducer.
To measure flow, it is first necessary to obtain detailed information about each application, which is then programmed
into the processor via the Key Pad. This information must be accurate otherwise flow measurement errors will occur.
Further, having calculated the precise position at which the transducers must be clamped onto the pipe wall, it is equally
important to align and separate the transducers accurately with respect to one another, as failing to do so will again
cause errors in measurement.
Finally, to ensure accurate flow measurement it is imperative that the liquid is flowing uniformly within the pipe and
that the flow profile has not been distorted by any upstream or downstream obstructions.
To obtain the best results from the Portaflow 216 it is absolutely necessary that the following rules for positioning the
transducers and that the condition of the liquid and the pipe wall are suitable to allow transmission of the sound along
its predetermined path.
‘A
‘B
FLOW
‘A’
‘B’
FLOW