16
There is a different engraving on the top of each transducer. The transducers
are mounted correctly if the engravings on the two transducers form an ar-
row. The transducer cables should point in opposite directions.
Later, the arrow, in conjunction with the indicated measured value, will help
to determine the direction of flow.
The sensor separation distance is automatically calculated by the flowmeter
based on the parameter entries for pipe outside diameter, wall thickness, lin-
ing material and thickness, medium, process temperature, the sensor type
and the selected number of signal passes. The sensor positioning screen
(above, and Section 3.3) allows fine adjustment of the sensor location.
3.7.4
Sensor mounting with fixtures and chains
●
Insert the retaining clip into the groove on the top of the transducer
and secure it using the screw knob.
●
Apply some acoustic coupling component to the contact surface of
the transducer.
●
Place the transducer on the side of the pipe or alternatively up to 45
degrees from the horizontal plane through the pipe.
This is advisable to establish the best acoustic contact since on top
of the pipe air pockets could develop and deposits could accumulate
at the bottom of the pipe.
●
Take the spring end of the chain in one hand and insert the last ball
element in the vertical slot of the retaining clip. Mount the chain
around the pipe.
●
Pull the chain firmly around the pipe and fasten it in the lateral slot of
the retaining clip. There should be no air pockets between the trans-
ducer surface and the pipe wall.
●
Mount the second transducer the same way.
●
Using a measuring tape, adjust the sensor separation distance as
suggested by the flowmeter. When the sensor positioning screen
(Section 3.3) is displayed, the middle bar allows fine adjustment of
the sensor location.
Illustration 5: Sensor mounting with fixtures and chains
