Home | Sitemap


Valve Actuators: Pneumatic Actuators, Hydraulic Actuators, Electric Actuators, ...

Valves: Ball Valves, Butterfly Valves, Gate Valves, Check Valves, Globe Valves, Control Valves, ...

Accessories: limit switch, manual override, solenoid valves, air units (air filter, regulator, air set), ...

E-mail: vtovalve@hotmail.com

Current Location: vtovalve >> Products >> Accessories >> Limit Switch >> ALS300AS2 Limit Switch Box, ALS300AS2 Series Valve Monitor

ALS300AS2 Limit Switch Box, ALS300AS2 Series Valve Monitor

ALS300AS2 Limit Switch Box, ALS300AS2 Series Valve Monitor

Product Name

Limit Switch Box, Valve Monitor

Model No.



AS-i Limit Switch Box (Valve Monitor) is a rotary position indication device which can directly comunicated with AS-i master. Armed with ACHEM I/O+Sensor Module, the device can sensor the valve position (On/Off), communicate with ASI master and output voltage (24VDC-1.5W) to operate the solenoid valves or relays based on the command from Master and PC.


Certificate of ALS300AS2 Series Limit Switch Box

Specifications And Technical Data

Enclosure Die-casting aluminum: O-ring sealed
Coating Dichromate conversion with polyester powder coating
O-rings Buna N
Environment Type 4, 4X, IP67
Area Classification Standard
Fasteners Stainless steel
Shaft Stainless steel Namur
 Conduit Entries Two 1/2" BSPP
Also available with two 1/2" NPT, M20-1.5
 Terminal Strip Contacts 8~14
 Mounting Bracket MB - 3.4: 30 x 80, 130 H : 20, 30 (Carbon steel) 
 Temperature Rating -20℃ ~ 85℃
AS-i I/O Modules+Sensors
 Model No. AS2
Address 1A-31A, 1B-31B(62)
Outputs (2) 28VDC (3 Watts total power available)
Inputs (4)

2-internal inputs, 11.6mA, 28VDC, Hall effect sensors
2-additional inputs, 16.6mA, 28VDC, mechanical switch, low power reed, or proximity sensor

Current Consumption <10.6mA (with no outputs energized)
Operating Voltage 29.5~31.6VDC AS-INTERFACE
Indication 4 Inputs, 2outputs and network, power LEDs
 Operating Temp.  -40℃ ~ +85℃

Wiring Diagram

Wiring Diagram of ALS300AS2 Series Limit Switch Box

DIP Switch Setting for Exchangeability

Manufacturer 1 2 3 4 5 6 7 8
Achem ON ON     ON ON ON  
Westlock, Alga ON ON     ON ON ON  
Sense ON       ON      
Pepperl+fuchs ON              
Stonel     ON   ON ON    
Topworx ON   ON   ON ON   ON

Note: By setting a DIP switch above which buit-in ACHEM Asi card brings the benefit of exchanged between products already installed, or in the case of an expansion of networks already installed without requiring any changes to PLC/DCS. 

Drawing and Dimension

Drawing Dimension of ALS300AS2 Series Limit Switch Box