Flameproof Valve Limit Switch
The MSL400 flameproof valve limit switch is specially developed for quarter-turn rotary actuators to provide reliable valve position feedback signal. It adopts flameproof explosion protection type, ideal for hazardous gas industrial environments.
This limit switch supports mechanical and inductive two switch types. It is equipped with dual electrical connection ports, available in G1/2, 1/2NPT and M20*1.5 cable entry options. The working ambient temperature ranges from -40℃ to +80℃.
Housing material can be aluminum alloy or stainless steel, achieving IP66 / IP67 ingress protection to resist dust and water ingress. It is widely used in chemical, petrochemical and pharmaceutical automation systems to monitor open and closed status of rotary valves.
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Product Principle
1、German production process and technology
2、NAMUR standard interface
3、Built-in brand-name switch (switch type optional)
4、IP67 ingress protection rating
5、Temperature range: -40°C ~ +80°C
6、Rugged die-cast aluminum housing
7、Stainless steel housing available upon request
8、Optional continuous position feedback
Key parameters
| parameter catalog | Value |
| Explosion Protection Type | Flameproof |
| Switch Type | Mechanical / Inductive |
| Electrical Connection | 2x (G1/2, 1/2NPT, M20*1.5) |
| 2x (1/2NPT, M20*1.5) | |
| Suitable Actuator Type | Quarter-turn (rotary) actuator |
| Ambient Temperature | -40°C ~ +80°C |
| Housing Material | Aluminum alloy / Stainless steel |
| Ingress Protection Rating | IP66/IP67 |
FAQ
We are a manufacturer with our own factory and independent R&D team. Our NAMUR limit switch boxes are produced under strict quality control with German production technology.
Yes, we offer customizable housing materials (aluminum die-cast or stainless steel), switch types (mechanical or inductive), and optional continuous feedback. Explosion-proof configurations are also available.
The limit switch box features IP67 protection and operates reliably from -40°C to 80°C, suitable for various industrial environments.
The NAMUR standard interface ensures direct mounting on actuators and valves, providing a standardized connection for position feedback in automation systems.
Both mechanical and inductive switch types are available, with optional continuous feedback to meet different control requirements.
It is widely used in angle stroke cylinder position feedback, valve automation, and industrial process control systems requiring reliable position sensing.
