Installation, Operation, & Maintenance Instructions
IOM JS500.03
2016.04
Vertical Float Switches
General Installation Instructions – Part 2: Spare Enclosure & Pressure Tube
Installation shall be carried out by suitably trained personnel in accordance with all local and national codes.
For hazardous area installations, also see ‘Installation Instructions Specific to Hazardous Areas’ section, page 10.
1. Remove all packaging and inspect each unit upon receipt and prior to installation. Careful handling is required at all times
to ensure that any and all electrical enclosure(s), connection(s) (flange facing, threading, etc.) are not dirty, damaged, or
bent.
2. Check the tag of the spare unit to ensure that any operating conditions and/or electrical requirements of the application
are within the ratings of the switch.
3. De-energize the unit by cutting all power to the electrical components of the unit.
4. Remove the original units’ enclosure cover to reveal the terminal block(s) to which electrical connections are made.
Explosion-proof models:
Locate and loosen M5 socket head safety grub screw on side of enclosure cover
adjacent to base joint. Place a bar across the top of the cover, locating in the castellations. The cover can now be
unscrewed from the base using the bar as a lever.
Weatherproof models:
Loosen and remove the hexagon bolt and fiber sealing washer at the top of the cover.
5. Remove all terminal and conduit connections. Do not remove switch(es) or change its position on the pressure tube.
6. Take the switch out of service following the instructions on page 11.
7. Remove original units’ pressure tube, with electrical enclosure base still attached, by loosening its threaded connection
atop chamber/vessel. Carefully raise pressure tube, taking care not to bend the float rod, until the stop clip, located below
the pressure tube, is visible.
8. Separate float assembly from pressure tube by removing stop clip. Pinch stop clip to remove, and do not let stop clip/float
assembly to fall into chamber. (Note: The stop tube, which sits on the stop clip, may prevent you from pinching the stop clip
sufficiently to remove it. Stop tube may have to be lifted up into the pressure tube in order to remove.)
9. On the original units’ pressure tube, mark the location of each switch, then remove each switch. Each switch mechanism
is mounted on the pressure tube by a locking screw and nut. These can be loosened, allowing the switch to be removed by
sliding it up and off the pressure tube.
10. Remove new enclosures’ electrical cover according to step 4.
11. Attach the stop clip to the bottom of the new pressure tube. (Note: Pinch stop clip in the absence of the stop tube in
order to sufficiently install.)
12. Fit new pressure tube, with new electrical enclosure, into top threaded connection of chamber and tighten the pressure
tube hex nut.
13. Transfer the switch locations from the original units’ pressure tube onto the new pressure tube, and mount the
switch(es) onto the pressure tube.
14. Connect electrical wiring via the conduit entry using a suitable cable gland. Note that the base of the enclosure is
rotatable on the pressure tube to allow the most convenient orientation of the conduit entry.
Refer to wiring notes on page 6 (all locations), & if applicable, page 7 (hazardous locations) .
15. The lugs of the tab washer directly underneath the base must now be bent over to locate on the most appropriate flats
of the hexagon union. This prevents further rotation of the enclosure base, and is particularly important as it will prevent
rotation when the enclosure cover is removed or re-fitted.
16. Check that cover seals in the enclosure base are present and in good condition, and then replace the cover.
Explosion-proof models:
Before energizing
, ensure the cover locking safety grub screw is replaced and
tightened. Do not energize if the cover locking safety grub screw is missing.
Weatherproof models:
Before energizing,
ensure that the fiber sealing washer and hexagon bolt were reinstalled
at the top of the cover.
17. Put switch back into service following steps on page 11.
18. Switch point adjustments may now be made if necessary, see page 13.
General Installation Instructions – Part 3: Conversion Kits
Installation shall be carried out by suitably trained personnel in accordance with applicable codes of practice.
For hazardous area installations, also see ‘Installation Instructions Specific to Hazardous Areas’ section, page 10.
1. Refer to Document JS500.06 for complete conversion instructions.
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