Siemens SITRANS F Operating Instructions Manual page 170

Section 3
Trim material from Trim material from
inner edge if
3" Overlapping
3" Overlapping
WRAPPING THE MYLAR SPACING GUIDE AROUND THE PIPE
10. Realign the left edge of the guide with the transducer edge mark. Line up both vertical edges of the
guide and ensuring that it is snug around the pipe, mark along the overlapping edge.
11. Remove the Mylar spacing guide and lay it out on a flat surface. Either, measure the exact distance
halfway between the overlap edge and the mark at the overlap or fold the guide from the overlap
edge to the overlap mark and draw a line at the fold or half way point.
12. Reinstall the spacing guide; its left edge abutting the transducers edge mark on the pipe and the
overlapping edge in line with the dot (now a line) on the pipe (see "C" on previous page). Tape it in
this position on the pipe. Take the second transducer and place it against the edge of the guide with
its white dot centered on the center mark on the guide. Temporarily position the transducer (in the
3 o'clock position opposite the mounted transducer) where it will be mounted. Ensure that this is a
smooth area without any raised spots (seams, etc.). While holding, mark a generous area around
the transducer (with a pencil or chalk) where it contacts the pipe. Remove the transducer and the
mylar guide.
13. Prepare the area you marked by de-greasing the surface if needed and removing any grit, corro-
sion, rust, loose paint or surface irregularities with the abrasive pipe conditioning material provided.
14. Replace the mylar guide back in the same position it was in and retape it to the pipe. Attach the EZ
clamp to the transducer under the spring clip. Unscrew the knob until it's at the stop.
15. Apply a 1/8-inch continuous bead of couplant compound along the center (the long way) of the
contact surface of the transducer. Position this transducer on the center of the pipe and aligned
with the edge and center marks on the guide; with the cable connector facing away from the other
transducer.
16. While holding this transducer in-place, bring the chain around the pipe and attach the closest
cross-link onto the hook of the EZ clamp. Tighten the adjusting nut until the chain is just snug
around the pipe. Check to ensure that the chain is straight around the pipe and that the transducer
is contacting the pipe at the white dot which is just under the front label. Ensure that there is equal
space on either side of the dot between the edges of the transducer and the pipe. Adjust if neces-
sary. Tighten the chain but do not overtighten. Ensure that the transducer did not move while tight-
ening.
17. Connect the transducer cable, ensuring that you have observed the upstream/downstream orien-
tation in respect to the cable and the input jack on the flow computer. If this is a dual-channel unit,
make sure you are connecting the cables to the correct channel's input jacks. Repeat this proce-
dure for the number index transducer.
inner edge if
necessary
necessary
Edge
Edge
END VIEW
End View
3-8
1010PFM-3G
Mylar
Mylar
Spacing Guide
Spacing Guide