4220 Flow Meter
Section 6 Maintenance and Service
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 |
| 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.
