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One type of proximity switch is an enclosed reed switch that is activated by a permanent magnet mounted to the piston. As the piston approaches, the magnetic field closes the switch, completing an electric circuit and producing an electric signal. Others prefer to use Hall-effect (Solid-State) sensors in combination with a piston-mounted magnet. The main difference between these two devices is that a reed switch is a mechanical device, while a Hall-effect (Solid-State) switch is electronic, with no moving parts to wear out. Reed switches have the advantage of operating on AC or DC current; Hall-effect (Solid-State) switches are limited to DC only. Also, reed switches are about half the price of their electronic counterpart, although the price differential is decreasing. On the other hand, Hall-effect (Solid-State) devices react much faster than reed switches, on the order of 100,000 versus 500 Hz. It is a waste of money to install microprocessor-based logic, and then be hampered by a slow switch. Overall, the trend seems to be towards these solid-state devices. Both switches have a repeatability of 0.005" or less. But often rod velocity, not switch accuracy, determines the overall repeatability of rod position. Because air is a compressible fluid, precise positioning of the cylinder rod -- especially in midstroke -- is difficult, regardless of the switch used. In many applications, even if the switch is very fast and accurate, getting the valves to react fast enough may be the real problem. In such cases, mounting fast-acting valves as close to the cylinder as possible is important. This eliminates excess compressible air in the lines between cylinder and flow control, giving more precise control. Note: Switch mounting hardware sold separately.

Body Style	Rectangular
Brand/Series	D-A Series
Connector Type	Grommet
For Use With	CQ2, MX, NCQ2, NCQ8
Mounting Type	Direct
Primary Type	Proximity
Technology	Reed
Voltage Rating	100 VAC/24 VDC
Wire Entry	Vertical
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• SMC Corporation
  SWITCH, REED, PNEUMATIC, NCA1 CYLINDER, CIRCUIT PROTECTION, IND. LIGHT, 3M CABLE
  
  型号：D-A54L
  仓库库存编号：70070572
  
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• SMC Corporation
  SWITCH, REED, PNEUMATIC, NCM CYLINDER, IND. LIGHT, 3M CABLE
  
  型号：D-C73L
  仓库库存编号：70070609
  
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• SMC Corporation
  Sensor, reed switch, tie rod mount, grommet connection, for NCA1 cylinder
  
  型号：D-A53
  仓库库存编号：70070871
  
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• SMC Corporation
  Sensor, reed switch, rail mount, grommet connection, for CQ2, NCQ2, MH cylinders
  
  型号：D-A73
  仓库库存编号：70070872
  
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• SMC Corporation
  Sensor, reed switch, rail mount, connector, for CQ2/NCQ2 cylinders
  
  型号：D-A73C
  仓库库存编号：70070873
  
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• SMC Corporation
  Sensor, reed switch, rail mount, grommet connection, for CQ2/NCQ2 cylinders
  
  型号：D-A73H
  仓库库存编号：70070874
  
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• SMC Corporation
  Sensor, reed switch, direct mount, grommet connection, for CQ2/NCQ2/MX/NCQ8
  
  型号：D-A93
  仓库库存编号：70070875
  
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• SMC Corporation
  Sensor, reed switch, band mount, grommet connection, for NCM cylinders
  
  型号：D-B54
  仓库库存编号：70070876
  
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• SMC Corporation
  Autosswitch, Reed, VAC/VDC, 2 Wire, LED, 0.5M
  
  型号：D-Z73
  仓库库存编号：70070877
  
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• SMC Corporation
  Sensor, reed switch, band mount, connector, for NCM cylinders
  
  型号：D-C73C
  仓库库存编号：70070919
  
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• SMC Corporation
  Autosswitch, Reed, VAC/VDC, 2 Wire, LED, 3M
  
  型号：D-Z73L
  仓库库存编号：70070925
  
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• SMC Corporation
  Sensor, reed switch, direct mount, grommet connector, for MX cylinders
  
  型号：D-A90L
  仓库库存编号：70070929
  
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• SMC Corporation
  Sensor, reed switch, direct mount, grommet connector, for MX cylinders
  
  型号：D-A90L
  仓库库存编号：70070929
  
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• 操作

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• Twin Industries
  BREADBOARD WITH 140 PIECE WIRE KIT AND POWER/GROUND POSTS
  
  型号：TW-E41-1060
  仓库库存编号：70012450
  
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• SMC Corporation
  Sensor, reed switch, direct mount, grommet connection, for CQ2/NCQ2/MX/NCQ8
  
  型号：D-A93
  仓库库存编号：70070875
  
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• SMC Corporation
  Sensor, reed switch, direct mount, grommet connection
  
  型号：D-97
  仓库库存编号：70071193
  
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• Souriau
  connector, plastic circular, metal coupling ring, wall recept, size 24, for 48 socket
  
  型号：UTG024-48S
  仓库库存编号：70129849
  
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• Keystone Electronics
  Washer; Flat; .098 ID; .187 OD; .047 Thick; Nylon
  
  型号：3151
  仓库库存编号：70181749
  
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• Panduit
  Green PP Locking Cable Tie Cable Tie, 188mm x 4.8 mm, PLT
  
  型号：PLT2S-M109
  仓库库存编号：70231484
  
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Body Style Rectangular  SMC Corporation Body Style Rectangular  Proximity Body Style Rectangular  SMC Corporation Proximity Body Style Rectangular   Brand/Series D-A Series  SMC Corporation Brand/Series D-A Series  Proximity Brand/Series D-A Series  SMC Corporation Proximity Brand/Series D-A Series   Connector Type Grommet  SMC Corporation Connector Type Grommet  Proximity Connector Type Grommet  SMC Corporation Proximity Connector Type Grommet   For Use With CQ2, MX, NCQ2, NCQ8  SMC Corporation For Use With CQ2, MX, NCQ2, NCQ8  Proximity For Use With CQ2, MX, NCQ2, NCQ8  SMC Corporation Proximity For Use With CQ2, MX, NCQ2, NCQ8   Mounting Type Direct  SMC Corporation Mounting Type Direct  Proximity Mounting Type Direct  SMC Corporation Proximity Mounting Type Direct   Primary Type Proximity  SMC Corporation Primary Type Proximity  Proximity Primary Type Proximity  SMC Corporation Proximity Primary Type Proximity   Technology Reed  SMC Corporation Technology Reed  Proximity Technology Reed  SMC Corporation Proximity Technology Reed   Voltage Rating 100 VAC/24 VDC  SMC Corporation Voltage Rating 100 VAC/24 VDC  Proximity Voltage Rating 100 VAC/24 VDC  SMC Corporation Proximity Voltage Rating 100 VAC/24 VDC   Wire Entry Vertical  SMC Corporation Wire Entry Vertical  Proximity Wire Entry Vertical  SMC Corporation Proximity Wire Entry Vertical