Using Extension Actuators (See Figure 3)
Each tilt switch has a threaded bore on the assembly’s bottom
where an extension actuator can be attached. The extension
actuator can be fabricated from pipe and steel sheet and then
screwed into the tilt switch. ength and vane size can be deter-
mined by the user as required by the application. (Optional 20”
extension actuators for TC-3 are available through Monitor - See
back page for details.) The extension actuators can improve tilt
switch operation in two ways:
1) Improve repeatability of detection angle: Material can cre-
ate a more consistent physical deflection when contacting
the vanes of an extension actuator than when contacting the
enclosure wall of the tilt switch.
2) Protection against physical wear: Extending the tilt switch
away from the initial contact with the “sensed” material will
prevent potential damage to the tilt switch.
Choosing a Location (See Figure 1)
1) Free movement: Select a location where any movement of
the tilt switch is not impeded by structural components such
as vessel braces or side walls. Insure the electrical connec-
tion does not impede the the tilting action of the tilt switch
when sensing material.
2) Material contact: Do not locate the tilt switch in the direct
flow of material as this may cause false signals or physical
damage to the enclosure or the electrical connections. Select
a hanging location where the application permits the tilt
switch to “tilt” at least 17ofrom vertical when “sensing” is to
be indicated. Consider whether extension actuators are
required. If the anticipated angle of deflection approximates
17˚ (hence very repeatable sensing is required), or if materi-
al is very coarse, thereby potentially causing physical dam-
age, attach an extension actuator to protect the tilt switch
(See Mechanical Installation).
MECH A N I C AL INS TALL ATION
P E-INS TALL ATION CONSIDE ATIONS
2
ELEC T I C A L I N STALL ATIO N
Figure 1
Figure 2
Figure 3
Suspension of Tilt Switch (See Figure 2)
ocate or fabricate a structural brace to support the full weight of
a suspended tilt switch (and extension actuator if used).
Interconnect the structural brace and the tilt switch with a rigid or
flexible hanger (e.g. wire rope, chain). Never hang tilt switch by
its electrical cable. Ensure installation permits the switch to “tilt”
at least 17˚ from vertical when “sensing” is to be indicated in a
360˚ circle. (Do not use a bolt through the eyebolt as a means of
attachment.) Shorter teathers will permit a 17˚ tilt where as long
flexible teathers may not allow the sensor to “tilt” 17˚ before the
sensor becomes buried in the material being sensed or detected.
Output Contacts (See Figure 4)
Each tilt switch has a cord connector sized to accept an electrical
cord with a diameter of 0.25-0.38in (6.4-9.6mm). Select a cord
rated for “extra hard usage” (e.g. SO or STO ratings). Guide cord
through the cord connector and tighten to insure dust-tight and
water-tight protection. If it is desirable to use conduit, remove
cord connector to expose threaded conduit entry in enclosure
body. Use at least two feet of flexible conduit. Never connect
rigid conduit directly to the tilt switch. Verify tilting action is not
impeded under normal sensing conditions. No power is required
to operate the tilt switches. Electrical installation is done directly
to the terminals of the output switch within the enclosure. The
terminals are designated with COM-common, N.C.-normally
closed, and N.O.-normally open. When the switch is “not tilted,”
the switch is opposite from normal condition (i.e. N.C. contact is
open to COM, and N.O. contact is closed to COM). However,
when the tilt switch is “tilted” the switch is in the normal condition
(i.e. N.C. contact is closed to COM, and N.O. contact is open to
COM). Connect earth ground to the terminal located on the
lower enclosure half. Be sure to comply with all electrical speci-
fications.
