Attaching The Transducers - GF PF220 V2 Betriebsanleitung

Installation
4.2

Attaching the transducers

Type 'A' & 'B' transducers connect to adjustable guide rails secured to the pipe using wrap-around chains and mechanically con-
nected together by the aluminum separation bar. The separation bar also acts as a ruler to allow the distance between the trans-
ducers to be accurately set to the value indicated by the flowmeter unit.
When fitting the guide rails it is easiest to assemble them onto the separation bar and adjust to the required separation distance
before attaching them to the pipe.
NOTICE
The use of chains to fix the guide rail to the pipe can be eliminated on steel pipes by using the optional magnetic guide rails. In all
other respects the setting up of the sensors is the same as for standard guide rails.
4.2.1 Cleaning the contact area
Prepare the pipe by degreasing it and removing any loose material or flaking paint in order to obtain the best possible surface.
A smooth contact between pipe surface and the face of the sensors is an important factor in achieving a good ultrasound signal
strength and therefore maximum accuracy.
4.2.2 Assembling the guide rails on the separation bar
1. Slide the separation bar into the front of the left-hand guide rail, align the front edge of the guide rail with '0' on the ruler scale
and secure it in place by tightening the thumbscrew.
2. Slide the other end of the separation bar into the front of the right hand guide rail, align the front edge of the guide rail to the
required separation distance (obtained from the flowmeter) on the ruler, then secure it in place by tightening the thumbscrew.
NOTICE
If magnetic guide rails are used on mild steel or iron pipes then only the location at 45° on the pipe apply on the next two sections.
2.2.1 Fixing the guide rail assembly to the pipe
1. On each guide rail, attach one end of a securing chain to a hook on the tensioning bar, wrap the chain around the pipe and then
attach it to the hook on the other end of the tensioning bar whilst keeping the chain as tight as possible.
2. Rotate the complete guide rail assembly so that it is approximately 45° with respect to the top of the pipe. Then tighten the
chain by turning the tensioning thumb-wheel on each guide block until the assembly is securely attached to the pipe.
NOTICE
If you are unable to get sufficient tension on the chain to hold the assembly in place, fully slacken the tensioning thumb-wheel and
shorten the effective length of the chain wrapped around the pipe by connecting the tensioning bar to the next link in the chain,
then re-tension.
A
B
C
D
E
F
G
20
Operating Instructions