Siemens SITRANS FUS1020, Manual, Page: 89 / 251

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1020NFM-1D
Section 3
11. Reinstall the Mounting 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 frame and place it against the edge of the guide with its
tapered roller centered on the center mark on the guide. Temporarily position the frame (in the 3
o’clock position opposite the mounted frame - see below) where it will be mounted. Ensure that
this is a smooth area without any raised spots (seams, etc.). Mark a generous area around the
mounting frames (1/2-inch on either side and half again the length front and back) with a pencil or
chalk. Remove the frame and the mylar guide.
12. 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.
Clean the pipe of any debris and abrasive particles.
13. Replace the mylar guide back in the same position it was in and retape it to the pipe.
14. Put a mounting strap around the pipe and engage an end into adjusting screw (screw should be
pointing up). Position frame in the middle of area you have cleaned and centered on the pipe with
its angled end facing away from where the other frame will sit; and aligned with the edge and center
marks on the guide. Slide the mounting strap over it (and under the clip if there is one) and tighten
with a screwdriver. While tightening, check to ensure that the center of the tapered roller is cen-
tered on the pipe.
15. Apply a 1/8-inch continuous bead of couplant compound down the center (the long way) of the
contact surface of one of the transducers. Place the transducer into one of the frames so that the
couplant compound does not smear until it contacts the pipe. Slide it in until it butts against the stop
and, while holding in-place, tighten the transducer clamping screw tight enough to hold firmly in-
place. Do the same with the other transducer.
16. 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.
17. Return to the menu, and press <ENTER> to finish the transducer install routine.
ALIGNING THE TRANSDUCERS FOR DIRECT MODE OPERATION
3 o’clock
Transducer
9 o’clock
Transducer
9 o’clock
Transducer
3 o’clock
Transducer