2
1. Ensure that float connected to stem is properly tightened. If not, tighten it.
2. Ensure other fasteners / screws have not loosened in transit. Tighten them adequately, if found
loose.
3. Open the enclosure cover. Switch assembly are fitted on the seal pipe.
4. Select continuity range on multimeter and connect its probes to `P' and `NO' contact of level
switch
5. Move the float manually upwards from its `Normal condition' to `Alarm condition' and ensure
that `NO' contacts become `NC' by observing continuity on the multimeter.
6. Similarly check all the contacts.
1. Select suitable location on the tank where the
vibrations are minimum.
2. The switch is installed vertically from top & can
be mounted internally fig 3 or externally as
shown fig.4.
3. External mounting is resorted to, where space is
limited or mechanical devices like stirrers
operate within the tank. Besides, in applications
like boilers, reaction kettles etc. with external
mounting, switch can be isolated for regular
servicing.
4. Ensure that process connection of level switch
should match with those on tank.
5. Ensure in case of externally mounted version CC
distance of external cage match with those on
tank.
6. Provide separate Isolation valve on tank for safety
& removal of Level switch for repairs/maintenance.
7. Ensure mounting nozzle length & inside diameter
must be sized correctly to allow for switch
actuation at desired level.
8. Provide suitable gasket between the flanges and
appropriate thread sealant between threads
before bolting / tightening, to ensure zero leakage
through joints.
9. Ensure that stem does not get bend during
installation.
Fig3‐Internalmountingontan
Fig4‐ExternalmountingonChamber
Tank
Proces Conn.
Stillwell
(Customer's scope)
Pressure
OPEN
SHUT
Boiler/
Vessel
OPEN
SHUT
Isolation
Valves
External
Chamber
Installation:
Pre-Installation Check:
