Teledyne 4220, Installation And Operation Manual, Page: 140 / 198

4220 Flow Meter
Section 6 Maintenance and Service
6-6
Again, any deformation of the stainless steel diaphragm will per-
manently disable the submerged probe. If you must remove the
nose of the probe, do it very carefully. A small warning disk is
located in front of the transducer.
Do not remove the warning
disk.
After cleaning, reinstall the nose section and tighten the screws.
The mounting hole must be aligned with the grounding
point.
Figure 6-3 Alignment of Grounding Point
6.3.4 Cable Inspection Periodically inspect the submerged probe cable for wear.
Damaged cables can affect the operation of the probe, particu-
larly if the reference port vent tube inside the cable is collapsed
or blocked. Damaged cables cannot be spliced or repaired suc-
cessfully and should be replaced.
If the submerged probe cable is damaged, you must replace the
probe assembly, as the probe, cable, amplifier, and connector are
a factory-sealed unit that cannot be repaired. Keep connectors
clean and dry. In permanent installations, such as treatment
plants, for example, install the cables so they are not at risk of
damage resulting from other activity taking place in the area.
In temporary installations, do not leave cables lying around
where they may be run over by heavy equipment. Do not leave
extra cable lying around in the flow stream where it can trap
debris.
In permanent installations, cables repeatedly subjected to rough
environments will fail and should be installed in conduit for pro-
tection. The conduit will have to be large enough to pass the M/S
connectors, as you cannot remove or replace them.
CAUTION
Avoid putting heavy pressure on the submerged probe cable
or making sharp bends in it when installing or servicing the
probe. Excessive pressure may collapse the cable, crushing
the reference vent tube. Sharp bends may cause the cable to
kink, also blocking the vent.
When securing the cable with plastic cable ties, tighten them
only enough to secure the cable; do not tighten them so much
that the cable jacket is visibly deformed.