Section 2 - INSTALLATION
9
The cable should be routed inside conduit connected to the enclosure which contains the Proximitor.
Where the cable is installed in a conduit, care must be taken not to rub or cut the cable on sharp or
rough surfaces. Protect the connector from contamination by covering or taping prior to pushing
through the conduit.
If it is undesirable or not possible to route the cable inside conduit, armored cable should be used.
Use clips or similar devices to secure the armored cable to supporting surfaces. Route the cable
through protected areas to reduce the chance of physical abuse. The armor should be terminated at
the Proximitor enclosure.
If the connector on the cable ever needs replacement, check with Bently Nevada Corporation for
installation procedures, connector part numbers, and the required tools.
2.5 PROXIMITOR INSTALLATION
The Proximitor should be mounted in an enclosure that provides protection from mechanical damage
and contamination. Weatherproof sheet metal or explosion-proof cast-aluminum housings provide
optimum protection from mechanical damage and undesirable climatic conditions. In corrosive or
solvent environments, the enclosure should be purged with clean, dry compressed air or inert gas to
protect the Proximitor. The protective enclosure should be free of material such as loose metal parts
that could short-circuit Proximitor terminals. Excess cable and uninsulated armor must be secured
away from Proximitor terminals. The excess cable, for example, can be secured with clamps to the
enclosure lid or housing wall.
Bently Nevada Corporation recommends placing as many Proximitors as possible in the same
protective enclosure, provided that all can be installed without altering the electrical length of the
probe-to-Proximitor cabling. Enclosing multiple Proximitors decreases installation costs and
simplifies the routing of cables from the Proximitors to the monitors. Check with the nearest Bently
Nevada Corporation office for information on available Proximitor housings.
Before installing power and signal connections, make sure the Proximitor supply voltage is within a
range of -17.5 Vdc to -26 Vdc, referenced to supply common. The exact voltage depends on the
requirements of the monitor being used with the system. When used with a -24 Vdc power source,
the 14 Millimetre Proximity Transducer System offers a linear range of approximately 160 mils
(4.06 mm). As the power source decreases (-18 Vdc for instance) there is a decrease in the linear
range. See Appendix C.
Field wiring from the Proximitor to the monitor is generally provided by the user unless a specific
request is made to have Bently Nevada Corporation do the fabrication. Shielded three-wire cable
should be used.
Proper isolation and shield grounding ensures that a minimum amount of noise will be induced in
the signal conductor. Bently Nevada Corporation recommends electrically isolating all Proximitors.
The Proximitor protective housings manufactured by Bently Nevada Corporation can be ordered to
Summary of Contents for Bently Nevada 7200 Series
Page 22: ...APPENDIX A 17 Figure A 1 14 mm Probe Ordering Information ...
Page 24: ...APPENDIX B 19 Figure A 3 14mm Extension Cable Ordering Information ...
Page 34: ...APPENDIX C 29 6 APPENDIX C SCALE FACTORS AND SENSITIVITY CURVES ...
Page 36: ...APPENDIX C 31 Figure C 2 Probe and One Foot Cable at Temperature ...
Page 38: ...APPENDIX C 33 Figure C 4 9 Metres Cable at Temperature ...
Page 42: ...APPENDIX C 37 Figure C 8 Effects of Flat Surface Side Clearance ...
