Product Description
The MMTC ASX-1 is an explosion-proof pneumatic switch rated NEMA 7 and NEMA 9 for Class I and Class II hazardous locations. Unlike electrical switches, the ASX-1 uses air pressure delivered through a pneumatic tubing line from a remote sensor to mechanically actuate the internal switch mechanism - there are NO electrical contacts in the pneumatic air-line path. This design eliminates the risk of electrical arcing or sparking in the hazardous zone, making the ASX-1 inherently safe for explosive, flammable, and combustible-dust environments where electrical activation would be prohibited. The rugged cast metal (cast steel) enclosure measures H: 5-3/4" x W: 4-1/2" x D: 4-1/2" and is specifically designed for integration with pneumatic safety edge systems and air-line gate operator control circuits.
Key Features
- NEMA 7 & 9 explosion-proof rated for Class I & II Division 1 & 2 hazardous locations
- Purely pneumatic actuation via air-pressure tubing - NO electrical contacts in the pneumatic air-line path, eliminating spark and ignition risk
- Rugged cast metal (cast steel) enclosure withstands explosive pressure without flame propagation
- Mechanically toggles internal switch mechanism via remote air pressure from pneumatic sensors or safety edges
- Ideal for gate operator and door control in flammable gas, vapor, and combustible dust environments
- Compact sealed design: 5-3/4" H x 4-1/2" W x 4-1/2" D
Compatibility Guide
- Pneumatic safety edge systems
- Air-line gate operator control systems
- Pneumatic door edge sensors
- Hazardous location access control systems
- Class I Division 1 & 2 installations
- Class II Division 1 & 2 installations
Professional Specs
| Feature | Specification |
|---|
| Model | MMTC ASX-1 |
| Item Type | Pneumatic Switch |
| Contact Configuration | Pneumatic actuation only - air pressure through tubing mechanically toggles the internal switch mechanism; NO electrical contacts in the pneumatic air-line path, eliminating spark risk in hazardous atmospheres |
| Enclosure Rating | NEMA 7 & 9 (Explosion-Proof; Class I Division 1 & 2, Class II Division 1 & 2 hazardous locations) |
| Materials | Cast metal (cast steel) explosion-proof enclosure |
| Dimensions | H: 5-3/4" x W: 4-1/2" x D: 4-1/2" |
| Mounting | Surface mount (cast metal enclosure with threaded conduit entry points standard for explosion-proof installations) |
Frequently Asked Questions
Q: How does the ASX-1 differ from a standard electrical switch?
A: Unlike a conventional electrical switch, the ASX-1 is actuated entirely by air pressure delivered through a pneumatic tubing line connected to a remote sensor such as a door edge or pneumatic safety edge. There are NO electrical contacts in the pneumatic air path - the air pressure mechanically toggles the internal mechanism inside the sealed cast metal enclosure. This means no electrical arcing or sparking occurs in the hazardous zone, making it safe for explosive or flammable atmospheres.
Q: What hazardous location classifications does the ASX-1 cover?
A: The ASX-1 carries NEMA 7 and NEMA 9 ratings, which cover explosion-proof enclosures for Class I (flammable gases and vapors) Division 1 & 2 and Class II (combustible dusts) Division 1 & 2 hazardous locations. This makes it suitable for environments such as petroleum facilities, chemical plants, grain elevators, paint booths, and other areas where ignition sources must be strictly eliminated.
Q: What types of systems is the ASX-1 compatible with?
A: The ASX-1 is designed to integrate with pneumatic safety edge systems and air-line gate or door operator control circuits. A pneumatic sensor or safety edge detects an obstruction and sends an air pressure pulse through tubing to the ASX-1, which then mechanically signals the gate or door operator to stop or reverse - all without introducing electrical energy into the hazardous zone.
Q: Why is the ASX-1 enclosure made of cast metal?
A: The ASX-1 enclosure is constructed of cast metal (cast steel), which provides the structural integrity required to contain any internal ignition without allowing flame or explosive pressure to propagate to the surrounding hazardous atmosphere. This robust construction is a core requirement for NEMA 7 & 9 explosion-proof certification and distinguishes it from standard plastic or light-gauge metal enclosures.
Q: Does the ASX-1 have voltage or current ratings?
A: No. The ASX-1 is a purely pneumatic device. There are no electrical contacts, voltage ratings, or current ratings associated with the pneumatic air-line path. Electrical connections may exist on the output side of the switch mechanism to signal a gate operator, but the actuation method itself is entirely air-pressure-driven, ensuring that no electrical energy is present in the hazardous sensing path where ignition risk is greatest.
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