Series LS Cylinders
  Product Detail
• Originators of Magno Reed Limit Switches
• UL Listed Models
• Indicator Light Feat

As an industry pioneer, Advance Automation was the first company to utilize reed switch technology in conjunction with a cylinder. Today, the company offers six different magno reed switch models:

LS10A - Original model; low profile; light duty applications
LS10 - Light duty applications
LS20 - Triac; A.C. only; heavy duty applications
LS30 - Utilize as NO and NC; light duty applications
LS11 - Green L.E.D. indicator light; light duty applications
LS21 - Triac; A.C. only; orange neon indicator light; heavy duty applications
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:

  1. Close (NO - normally open switch)
  2. 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.

LS20 switches include a triac and will not operate on D.C. Switch will appear to malfunction if tested with a D.C. device such as a V.O.M. or continuity tester. For proper switch actuation, .05 AMP minimum current load required.

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.

Specifications for LS11 & LS21 Note: To find power in watts, simply multiply current times voltage (i.e.: Power = Volts x Amps)

LS11 LS21
D.C. A.C. A.C. only
Maximum Voltage 100 120 135
Maximum Current (Amps) .300 .200 1.00
Minimum Voltage 10 12 90
Minimum Current (Amps) .005 .050 .050
Maximum Power (Watts) 10 10 100