ALS-200P1 Limit Switch Box


ALS-200P1 Valve Position Monitor, ALS-200P1 Limit Switch Box,

ALS-200P1 Limit Switch Box


ALS series limit switch boxes are a kind of field instrument for detecting valve status in automatic control system. It is used to output the open or closed position of the valve as a switch signal, and is received by the programmer or sampled by the computer. After confirming, the next step is executed. It is also used as an important valve interlock protection and remote alarm indication in the automatic control system.


  • Compact and beautiful design, polyester powder coated aluminum die-casting housing and hard anodized body of solenoid valve.
  • Higher level weather proof (IP67) and /or explosion proof (Exd IIBT6 or Exd IICT6) both for solenoid valve and limit switch box in same time.
  • Dual cable entries, 2XG1/2 (Standard ) and M20X1.5, NPT 1/2 ( Optional)
  • Multipoint terminal strip, standard 8 points and enough strips for connection ( 14 points for optional).
  • Multiview visual position indicator, secure waterproof, multi-angles visual valve positions involving top and side view.
  • “ Quick-set” Cam, spring loaded splined cam. No need to adjust again after initial setting and easy setting without tool.
  • Captive cover bolts, no worry to loose bolts while cover opens.
  • Easy mounting, NAMUR and ISO5211 adjustable bracket same as for 30*80 H20-30. Standard is steel plate and stainless steel ( optional).

Ordering Code


Model ALS-200 ALS-300 ALS-400 ALS-500
Weather Proof IP67
Exclusion Proof Exd II CT6 Exd II BT6
Temperature Range -20℃-85℃
Cable Entry 2X1/2 G (BSPP), NPT, BSPT, M20*1.5 2X3/4 G (BSPP), NPT, BSPT
Terminal Strips 8-12 8-14 8-12 8-10
Position Indicator 0-90° Open – Yellow; Close – Red
Mechanical Switches 5A125-250VAC 15A125-250VAC
Proximity Sensor DC24V (10-30VDC), ≤150mA
Magnet Sensor 5-240VAC/ DC, ≤300mA
Position Transmitter Feedback 4-20mA