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ALS-400N Limit Switch
Design & Features
The ALS-400 Series Limit Switch Boxes have three models. One is ALS-410N (mechanical), second is ALS-420N (Proximity
Sensor), and third is ALP-430N (4-20mA Position Transmitter). The relation between models and function is as followings:
| Model |
Type of Switches |
Position Transmitter |
| ALS-410N |
Mechanical |
No |
| ALS-420N |
Proximity Sensor |
No |
| ALS-430N |
Mechanical or Proximity Sensor |
4-20mA Position Transmitter |
ALS 400 series are designed suitable for valve and actuators in hazardous area application, having compact but robust construction
conforms to EN50014 and 50018, also suitable in Zone 1 and 2, and ingress protection IP67. Standard aluminum housing provides
reliable explosion proof performance.
In the model of ALS-430N, Electronic Position Transmitter is designed and assembled for Industry Automation which senses
mechanical position change of stem being on the valve or similar device and converses to current signal of DC 4~20mA outputs for
computers or Industry Processing Control System. It is flame proof type attached internally.
The ALS-400 series Limit Switch Box is provided with following features:
1、Compact and beautiful design
Aluminum die-casting housing and powder coated
2、Bolts on visual position Indicator
Secure waterproof
3、"Quick-Set" cam
Spring loaded splinted cam. No need to adjust again after initial setting, Easy setting without tool
4、Multipoint terminal strip
Standard 8 points and enough strips for connection
5、Dual cable entries
2xG1/2 (Standard), M20x1.5, NPT1/2(Option)
6、Captive cover bolts
No worry to loose bolts while cover opens
7、Easy mounting
NAMUR standard stainless steel shaft and bracket
Structure and Material(ALS-210N)
| No. |
Part Name |
Qty. |
Material |
Picture |
| 1 |
Box Cover |
1 |
Aluminum Die Casting |
|
| 2 |
Box Body |
1 |
Aluminum Die Casting |
| 3 |
Shaft |
1 |
Stainless Steel |
| 4 |
Indicator Cover |
1 |
Polycarbonate |
| 5 |
Indicator |
1 |
ABS/Polycarbonate |
| 6 |
Limit Switch |
2 |
Mechanical |
| 7 |
Postion Transmitter |
1 |
PCB |
| 8 |
Potentiometer |
1 |
|
| 9 |
Gears |
2 |
Brass |
| 10 |
Terminal Strip |
8 |
Polycarbonate |
| Tin Plated Brass |
| Stainless Steel |
| 11 |
Cam |
2 |
Polycarbonate |
| 12 |
Spring |
1 |
Stainless Steel |
| 13 |
Cover Bolts |
4 |
Stainless Steel |
| 14 |
Shelf O-ring |
2 |
NBR |
| 15 |
Housing O-ring |
1 |
NBR |
| 16 |
Indicator O-ring |
1 |
NBR |
| 17 |
Bushing |
2 |
Bronze |
| 18 |
Earth Lug |
1 |
Stainless Steel |
| 19 |
E-ring |
1 |
Stainless Steel |
Specification
| Limit Switch Box (ALS-400N) |
Position Transmitter(PT) |
| Description |
Technical Data |
Description |
Technical Data |
| Weather Proof |
IP67 |
Input Type |
2Wire |
| Enclosure |
ExdII BT6 (ExdII CT6) |
Input Signal |
0˚~90˚ |
| Temperature Range |
-20℃~85℃ |
Output Signal |
4-20mA DC |
| Cable Entry |
2xG1/2 (2xM20-1.5, 2x1/2NPT) |
Load Resistance |
0~600 Ohm |
| Terminal Strips |
8 Points (9~12 Points) |
Noise Range |
50mVp.p |
| Position Indicator |
0-90˚(Open-Yellow Close-Red) |
Adjustable Range |
Zero :±10% Span : 60~110% |
| Switches |
Mechanical (Proximity Sensor) |
Protection |
IP66 |
| Potentiometer |
3600˚, 5K ohm |
Linearity |
±1% |
| |
Sensitivity |
±0.2% |
| Hysteresis |
0.002 |
| Supply Voltage |
15~30V DC |
| Explosion Proof |
Non-Explosion |
Dimension
Wiring
Bracket
| Model |
Picture |
Material |
Application |
| MB-4.0 |
 |
Steel Plate |
30x80 H:20 |
| Stainless Steel |
| Steel Plate |
30x80 H:30 |
| Stainless Steel |
| MB-4.1 |
|
Steel Plate |
30x130 H:30~50 |
| Stainless Steel |
|
