Light duty applications include programmable logic controllers
and computers. Heavy duty applications include devices such as
solenoid valves, contactors, and lamp loads exceeding 10 watts.
The LS10, LS20 and LS30 are UL listed for hazardous duty locations
as detailed in the charts in this section.
Reed Switch
Switch Description
The aluminum switch housing contains a reed device, which consists
of two overlapping reed blades of a ferromagnetic material. These
blades are supported in a hermetically sealed glass tube and encased
in epoxy resin in the housing. Each reed blade connects to its
own exterior wire lead.
Switch Actuation
All the reed switches that Advance Automation offers operate
in the same manner. The groove on the piston is machined deeper
to accept a magnet strip. The switch actuates when the magnet
on the piston passes under the reed device. Because the reeds
are ferromagnetic, the opposite ends assume opposite magnetic
polarity when brought within the influence of a magnetic field.
The reed blades will then do one of two things:
- Close (NO - normally open switch)
- Open (NC - normally closed switch)
Switch Applications
Use it for automatic cylinder cycling, light indication, cylinder
programming and sequencing, trip timers and counters, multi-position
signaling, and many other applications. A switch may be connected
to a programmable logic controller, a PC, or a relay. The operation
of the switch can be repeated millions of times at extremely high
speeds. The mechanical life of a switch is 10 to 100 million cycles.
The electrical life of a switch, when used within the recommended
guidelines, exceeds 2 million operations.
Switch Ratings
Do Not Exceed Switch Rating.
If you are not sure of your circuitry current ratings,we recommend
you use the LS20.
Caution
Limit switches can be destroyed by a very brief contact across
line voltage, such as brushing a wire against conduit. DO NOT
CONNECT WITH A LIVE CIRCUIT. Turn on power only after you are
certain that the switch is connected in series with a properly
rated load.
Switch Testing
All switches have been factory tested. If field testing is
desired, the testing device must coincide with all switch data
to prevent switch failures due to testing.
Facts
LS10A & 10 -- These switches have reeds
only. To protect against contact deterioration, a contact protection
circuit may be required.
LS20 -- This switch has the necessary electrical
components built in to allow direct wiring into the majority of
circuits without the aid of additional resistors and capacitors.
LS30 -- This switch contains a reed only with 3 leads. They
are green (NO - Normally Open), red (NC - Normally Closed) and
black (common). To protect against contact deterioration, a contact
protection circuit may be required.
LS11 & LS21 Indicator Light Reed Switch
In addition to all the industry leading features and benefits
of the popular LS10 and LS20 switches, these models incorporate
lights to show the on/off status of the switch.
LS11 -- A two (2) wire device intended for
lower level D.C. voltages. The LS11 is excellent for use with
solid state logic systems and programmable controllers that require
12 to 30V D.C. inputs. A green L.E.D. provides the illumination
(see specifications and wiring).
LS21 -- A three (3) wire device intended for
110-120 A.C. operation at up to 1.00 AMP. An orange neon bulb
provides the illumination (see specifications and wiring).
Models Available: These are not UL listed.
