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Limit Switch Box 310N Series Manufacturer

Limit Switch Box 310N Series

Limit Switch Box is a field instrument to detect the valve status in the automatic control system, which is used to switch the opening or closing position of the valve (the signal output of the contact is accepted by the program controller or the computer search sample, and then execute the next procedure after confirmation. The product can also be used as an important valve interlock protection and remote alarm indication in the automatic control system.


The HyM.3 Series Valve Position Monitor is a compact weatherproof enclosure featuring internal adjustable position switches and an external visual indicator. It adheres to the NAMUR standard for mounting and drive, making it ideal for installation on quarter-turn actuators and valves.

dimension of APL 310N Limit Switch Box 1


The HyM.3 Series Valve Position Monitor utilizes a compact design to provide a miniature weatherproof protection, housed in an aluminum die-cast enclosure with O-ring sealing. Its bracket conforms to ISO 5211 and the NAMUR standard

Main Parameters

  • Solid and compact design with aluminum die-cast housing and polyester powder-coated finish.
  • Features a bolt-on Visual Position Indicator and “Quick-set” spring-loaded splined cam.
  • No need for readjustment after initial setup; easy to set without tools.
  • Equipped with dual cable entries and captive cover bolts to prevent loss during removal.
  • Utilizes NAMUR standard stainless steel shafts and brackets for durability.
  • Includes Omron switches for seamless operation.

Key Features and Characteristics:

  • Sturdy and compact aluminum die-cast housing with polyester powder-coated finish.
  • Bolt-on Visual Position Indicator for easy installation.
  • “Quick-Set” spring-loaded splined cam ensures no need for readjustment after initial setup, enabling tool-free adjustments.
  • Dual cable entries provided for convenience.
  • Captive cover bolts prevent loss when cover is removed.
  • NAMUR standard stainless steel shaft and bracket enhance durability.
  • Equipped with Omron switches for reliable performance.

We provide a variety of Limit Switch Boxes, if you have special needs, please get in touch with us directly!

Standard Specification


Model HVM-3 Series
Enclosure Weatherproof IP67/NEMA4&4X
Cable entries Two NPT1/2″
Ambient temperature -20°C~80°C
Terminal strips 8 points (0.05-2.5mm²)
Position indicator 0~90° (90° turn free join) close: red open: yellow
Switches Mechanical switch x2 proximity sensor x2
Painting Chromate Polyester powder coating(black)

Material of Parts

Housing Cover & Body A luminum die casting O-ring NBR
Shaft Stainless steel Bushing Bronze
Indicator cover Polycarbonate E-ring (Shaft) Stainless steel
Cam Polycarbonate Earth Lug Stainless steel
Spring Stainless steel Indicator ABS/Polycarbonate
Housing cover bolt Stainless steel Bracket Stainless steel

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