Superior Explosion-Proof Certification
Unlike standard enclosures, the APL-510N is built with a certified flameproof enclosure (Ex d IIC T6) . This heavy-duty, precision die-cast aluminum alloy housing is designed to contain any internal spark or explosion, preventing ignition of flammable gases or vapors in the surrounding atmosphere. The IIC gas group certification makes it suitable for environments containing the most volatile gases, including hydrogen, acetylene, and carbon disulfide. It meets strict international standards (EN50014 & EN50018) for use in hazardous locations (Zone 1 & 2) where the highest level of safety is paramount.

Clear Visual and Electrical Feedback
The unit features a durable, transparent polycarbonate dome with a highly visible mechanical indicator. The indicator shows a clear Yellow flag for the “Open” position and Red for “Closed” , allowing operators to instantly verify valve status from a distance . Internally, the APL-510N is equipped with 2 x SPDT (Single Pole Double Throw) mechanical switches as standard, which provide separate electrical signals for the open and closed positions to a PLC, DCS, or remote monitoring system. Each switch includes a common (COM), normally open (NO), and normally closed (NC) contact, offering maximum wiring flexibility.

Tool-Free Adjustment and Easy Installation
One of the key features of the APL-510N is its “Quick-Set” cam mechanism. The cams are spring-loaded and mounted on splined shafts, allowing for fast and precise adjustment without any tools. Once set, they maintain their position, ensuring stable signal settings even under high-vibration conditions. The box includes a mounting bracket that complies with the NAMUR VDI/VDE 3845 standard, guaranteeing a perfect fit on most commercially available pneumatic actuators. Captive cover bolts with a unique spring-loaded design prevent loss during maintenance and ensure proper closure.

Rugged Construction for Harsh Environments
Built to withstand the most demanding industrial and marine environments, the APL-510N features a die-cast aluminum alloy enclosure with a corrosion-resistant polyester powder coating . It boasts an IP67 protection rating, making it dust-tight and protected against temporary immersion in water, suitable for harsh offshore or chemical plant installations. Dual cable entries (standard 3/4″ NPT) provide flexibility for wiring, and an internal 8-point terminal strip simplifies electrical connections. The shaft, springs, and mounting bracket are constructed from stainless steel for maximum corrosion resistance.

Versatile Options
The APL-510N series offers extensive flexibility to meet various application needs:

• Switch Options: Up to 4 mechanical switches or 4 proximity sensors (inductive or magnetic).

• Analog Feedback: Potentiometer (1k, 5k, 10k ohm) or 4-20mA current position transmitter.

• Enhancements: IP68 enclosure, three-position indicator (Green/Red), and extended temperature ranges

APL-5N Series

1. Degree of protection: IP67 / NEMA4, 4X, 7,9 (standard) IP68 (option)
2. Explosion-proof grade: EEx d IIB T6, EEx d IIC T6, EEx ia IIC T6
3. Sturdy and beautiful housing, the housing is equipped with a spindle (biaxial)
4. Easy installation of visual position indicator
5. Unique design fixes the cap by bolting the cap
6. Dual cable entry: 2 / 4PF (standard) / M20, M25, NPT3 / 4 “, PT3 / 4”
7. Terminals: 8 points (0.08-2.5mm2)
8. Anti-off bolts, spring reinforcement
9. The unique design holds the bolt in the housing, and the bolt does not fall off when the housing is opened
10. Easy to install bracket
11. Stainless steel spindles and stainless steel or steel brackets are NAMUR compliant

Clear Visual and Electrical Feedback
The unit features a durable, transparent polycarbonate dome with a highly visible mechanical indicator. The indicator shows a clear Yellow flag for the “Open” position and Red for “Closed” , allowing operators to instantly verify valve status from a distance. Internally, the APL-310N is equipped with 2 x SPDT (Single Pole Double Throw) mechanical switches as standard, which provide separate electrical signals for the open and closed positions to a PLC, DCS, or remote monitoring system. Each switch includes a common (COM), normally open (NO), and normally closed (NC) contact, offering maximum wiring flexibility.

Tool-Free Adjustment and Easy Installation
One of the key features of the APL-310N is its “Quick-Set” cam mechanism. The cams are spring-loaded and mounted on splined shafts, allowing for fast and precise adjustment without any tools. Once set, they maintain their position, ensuring reliable long-term operation even under vibration. The box includes a mounting bracket that complies with the NAMUR VDI/VDE 3845 standard, guaranteeing a perfect fit on most commercially available pneumatic actuators. Captive cover bolts prevent loss during maintenance .

Rugged Construction for Harsh Environments
Built to withstand demanding industrial and marine environments, the APL-310N features a die-cast aluminum alloy enclosure with a corrosion-resistant polyester powder coating . It boasts an IP67 protection rating, making it dust-tight and protected against temporary immersion in water, suitable for outdoor or below-deck installations. Dual cable entries (standard 1/2″ NPT) provide flexibility for wiring, and an internal 8-point terminal strip simplifies electrical connections .

Versatile Options
The APL-310N series offers flexibility to meet various application needs. Options include up to 4 switches (mechanical or proximity sensors), potentiometers for analog feedback, 4-20mA current output units, and extended temperature ranges (-40°C to +80°C or -20°C to +150°C).

APL-3N Series

1. Degree of protection: IP67 / NEMA4 & 4X (standard) IP68 (option)
2. Sturby beautiful shell design addiniotal limit
3. Switch: 3~4 mechanical switch addiniotal wiring
4. Terminal: 8~16 points
5. The switch position can be cleared by the indicator
6. Two-wire interface: Dual 1 / 2NPT pipe interface (standard) /M20,PG13.5,PF1/2 “, PT1 / 2” (option)
7. Terminal: 8 points (0.08-2.5mm2)
8. Anti-off bolts
9. Easy installation, stainless steel spindle connection part and mounting bracket are in line with NAMUR standard

Certified Explosion-Proof Safety
Unlike standard enclosures, the APL-410N is built with a certified flameproof enclosure (Ex d IIB T6). This heavy-duty, precision die-cast aluminum alloy housing is designed to contain any internal spark or explosion, preventing ignition of flammable gases or vapors in the surrounding atmosphere. It meets strict international standards for use in hazardous locations (Zone 1 & 2), making it ideal for Oil & Gas, petrochemical, and marine applications where safety is paramount.

Clear Visual and Electrical Feedback
The unit features a durable, transparent polycarbonate dome with a highly visible mechanical indicator. The indicator shows a clear Yellow flag for the “Open” position and Red for “Closed” , allowing operators to instantly verify valve status from a distance . Internally, the APL-410N is equipped with 2 x SPDT (Single Pole Double Throw) mechanical switches (standard configuration), which provide separate electrical signals for the open and closed positions to a PLC, DCS, or remote monitoring system. Each switch includes a common (COM), normally open (NO), and normally closed (NC) contact, offering maximum wiring flexibility .

Tool-Free Adjustment and Easy Installation
One of the key features of the APL-410N is its “Quick-Set” cam mechanism. The cams are spring-loaded and mounted on splined shafts, allowing for fast and precise adjustment without any tools. Once set, they maintain their position, ensuring stable signal settings even under high-vibration conditions typical of high-pressure pipelines. The box includes a mounting bracket that complies with the NAMUR VDI/VDE 3845 standard, guaranteeing a perfect fit on most commercially available pneumatic actuators. Captive cover bolts prevent loss during maintenance .

Rugged Construction for Harsh Environments
Built to withstand demanding industrial and marine environments, the APL-410N features a die-cast aluminum alloy enclosure with a corrosion-resistant polyester powder coating. It boasts an IP67 protection rating, making it dust-tight and protected against temporary immersion in water, suitable for harsh outdoor or deck installations. Dual cable entries (standard 3/4″ NPT) provide flexibility for wiring, and an internal 8-point terminal strip simplifies electrical connections. The shaft, springs, and hardware are constructed from stainless steel for maximum corrosion resistance.

APL-4N Series

1. Degree of protection: IP67 / NEMA4, 4X 7, 9 (standard) IP68 (option)
2. Explosion-proof grade: EEx dIIB T6, certified by China NEPSI
3. Rugged and beautifil Additional limit switch: 3~4 mechanical switches
4. Additional terminals: 8 to 20 points
5. A variety of optional switches
6. Cable access: 2×3 / 4 NPT (standard) / M20, M25, PF3/4″, PT3/4″ 4 Cable entries
7. 0 Wire port: 8 points (0.08-2.5mm2)
8. Easy installation, stainless steel spindle connection part and mounting bracket are in line with NAMUR standard

Clear Visual and Electrical Feedback
The unit features a durable, transparent polycarbonate dome with a highly visible mechanical indicator. The indicator shows a clear Yellow flag for the “Open” position and Red for “Closed” , allowing operators to instantly verify valve status from a distance. Internally, the APL-210N is equipped with two SPDT (Single Pole Double Throw) mechanical switches, which provide separate electrical signals for the open and closed positions to a PLC, DCS, or remote monitoring system. Each switch includes a common (COM), normally open (NO), and normally closed (NC) contact, offering maximum wiring flexibility.

Tool-Free Adjustment and Easy Installation
One of the key features of the APL-210N is its “Quick-Set” cam mechanism. The cams are spring-loaded and mounted on splined shafts, allowing for fast and precise adjustment without any tools. Once set, they maintain their position, ensuring reliable long-term operation. The box includes a mounting bracket that complies with the NAMUR VDI/VDE 3845 standard, guaranteeing a perfect fit on most commercially available pneumatic actuators . Captive cover bolts prevent loss during maintenance.

Rugged Construction for Harsh Environments
Built to withstand demanding industrial and marine environments, the APL-210N features a die-cast aluminum alloy enclosure with a corrosion-resistant polyester powder coating . It boasts an IP67 protection rating, making it dust-tight and protected against temporary immersion in water, suitable for deck or outdoor installations. Dual cable entries (standard 1/2″ NPT) provide flexibility for wiring, and an internal 8-point terminal strip simplifies electrical connections.

APL-2N Series

1. Degree of protection: IP67 / NEMA4 & 4X (standard) IP68 (option)
2. Rugged and compact case design
3. The switch position can be cleared by the indicator
4. Two-wire interface: Dual 1 / 2NPT pipe interface (standard) /M20,PG13.5,PF1/2 “, PT1 / 2” (option)
5. Terminal: 8 points (0.08-2.5mm2)
6. Anti-off bolts
7. Easy installation, stainless steel spindle connection part and mounting bracket are in line with NAMUR standard