Technical Specifications
| Model Number | MA-OSY-1 |
| Product Name | Supervisory Switch |
| Category | Valve Monitoring Device |
| Certification | UL Listed (UL353) |
| Manufacturer | Maple Armor / Tongfang |
| Warranty | 2-Year Standard |
| Switch Type | Mechanical Position Switch |
| Contact Configuration | SPDT (Single Pole Double Throw) |
| Contact Rating | 1A @ 30VDC, 0.5A @ 125VAC |
| Contact Material | Silver Alloy |
| Operating Force | 2-5 oz (57-142 g) |
| Travel Distance | 0.125" (3.2mm) |
| Operating Temperature | -40°C to +85°C (-40°F to 185°F) |
| Storage Temperature | -50°C to +100°C (-58°F to 212°F) |
| Humidity | 0% to 95% RH (Non-condensing) |
| Weatherproof Rating | IP66 (Dust tight, Water jet protected) |
| Enclosure Material | Stainless Steel (304) |
| Mounting Type | Valve Stem or Post Indicator Mount |
| Dimensions (HxWxD) | 2.5" x 1.5" x 1.0" (64mm x 38mm x 25mm) |
| Weight | 0.5 lbs (0.23 kg) |
| Wire Gauge | 14-22 AWG |
| Terminal Type | Screw Terminals |
| Connection Type | Normally Open or Normally Closed |
| Valve Compatibility | Post Indicator Valves (PIV), Wall Post Valves |
| Tamper Detection | Yes (valve position change detection) |
| NFPA 13 Compliance | Yes (2019 Edition) |
| NFPA 72 Compliance | Yes (2019 Edition) |
| Expected Life | 1,000,000 mechanical cycles |
Switch Configuration Types
Normally Open
Closed when valve is open, open when valve is closed
Normally Closed
Open when valve is open, closed when valve is closed
SPDT
Single Pole Double Throw for flexible wiring
Valve Position Monitoring
Monitors valve position and detects unauthorized closure
Product Overview
The MA-OSY-1 Supervisory Switch is a critical component in fire protection systems, designed to monitor the position of sprinkler system control valves. It ensures that valves remain in the proper open position and immediately alerts the fire alarm system if a valve is closed or tampered with, preventing potentially catastrophic failures in fire protection systems.
Valve Position Monitoring
Continuous monitoring of sprinkler system control valve positions.
Tamper Detection
Immediate detection of unauthorized valve closure or tampering.
Weather Resistant
IP66 rating for reliable operation in harsh outdoor environments.
Key Characteristics
Reliable Switching: SPDT contacts with silver alloy for long life
Durable Construction: Stainless steel enclosure (304 grade)
Weatherproof: IP66 rating for outdoor valve applications
Flexible Configuration: Normally open or normally closed operation
Electrical Rating: 1A @ 30VDC contact rating
Wide Temperature Range: -40°C to +85°C operation
Valve Monitoring Applications
Sprinkler Valves
Post indicator valves and wall post valves
Water Supply
Main water supply control valves
Zone Valves
Floor or zone control valves
Test/Drain Valves
Test and drain valve supervision
Supervisory Importance: According to NFPA statistics, a significant percentage of sprinkler system failures occur due to closed valves. Supervisory switches like the MA-OSY-1 provide early warning of valve closures, allowing for timely corrective action before a fire occurs. They are required by NFPA 13 and NFPA 72 for all sprinkler system control valves.
Product Features
Mechanical Features
- Mechanical position switch with SPDT contacts
- Silver alloy contacts for long electrical life
- 1A @ 30VDC, 0.5A @ 125VAC contact rating
- 2-5 oz operating force for reliable actuation
- 0.125" travel distance for precise operation
- 1,000,000 mechanical cycle life expectancy
- Adjustable actuation point for precise positioning
Construction Features
- Stainless steel enclosure (304 grade)
- IP66 weatherproof rating
- Corrosion-resistant construction
- UV resistant for outdoor applications
- Screw terminal connections
- Conduit entry with sealing grommet
- Tamper-resistant mounting
Electrical Features
- SPDT (Single Pole Double Throw) configuration
- Normally open or normally closed operation
- 14-22 AWG wire compatibility
- Low current draw (supervisory circuit only)
- Compatible with Class A or Class B wiring
- End-of-line resistor compatible
Installation Features
- Valve stem or post indicator mounting
- Adjustable mounting bracket included
- Installation hardware provided
- Clear installation instructions
- Visual position indicator
- Test function for verification
Valve Supervision Requirements: NFPA 13 requires that all control valves in sprinkler systems be supervised. This includes post indicator valves, wall post indicator valves, and other types of control valves. The MA-OSY-1 must be installed so that any movement of the valve from its normal position will be detected and reported to the fire alarm system.
Installation & Configuration
Post Indicator Valve
PIV mounting on valve stem
Wall Post Valve
WPV mounting on wall valves
Butterfly Valve
Butterfly valve supervision
Installation Guidelines
- Mount on valve stem or operating mechanism
- Ensure proper alignment with valve movement
- Adjust actuation point for proper valve position
- Follow NEC and NFPA requirements
- Use proper conduit and sealing methods
- Ensure weatherproof installation for outdoor valves
- Test switch operation after installation
Wiring & Configuration
Circuit Type
Supervisory circuit (Class A or Class B).
Contact Configuration
Set as normally open or normally closed.
Wiring Considerations
Include end-of-line resistor if required.
Testing
Verify switch operation with valve movement.
Installation Steps
- Verify valve is in normal (open) operating position
- Mount switch on valve stem or operating mechanism
- Adjust switch position for proper actuation
- Route wiring in approved conduit to switch location
- Connect wires to screw terminals (observe polarity if required)
- Seal conduit entry with provided grommet
- Test switch operation by moving valve slightly
- Verify fire alarm system receives supervisory signal
- Return valve to normal operating position
- Verify fire alarm system shows normal status
- Document installation and testing results
- Label valve with appropriate identification
Valve Types Requiring Supervision
Main Control Valves
All sprinkler system control valves.
Water Supply Valves
Main water supply control valves.
Zone Control Valves
Floor or section control valves.
Compatibility & Applications
Compatible Systems
- Maple Armor FW2000 Series FACP
- Maple Armor FW2100 Series
- Maple Armor FW2200 Series
- Most fire alarm control panels
- Addressable and conventional systems
Typical Applications
- Commercial office buildings
- Industrial facilities
- Healthcare facilities
- Educational institutions
- Retail complexes
- High-rise residential buildings
Application Scenarios
Commercial Buildings
Main sprinkler control valve supervision.
Industrial Facilities
Zone valve monitoring in manufacturing plants.
Healthcare
Critical valve supervision in hospitals.
Benefits
Continuous Monitoring: 24/7 valve position supervision
Code Compliance: UL353, NFPA 13, NFPA 72 compliant
Reliable: Stainless steel construction for harsh environments
Weatherproof: IP66 rating for outdoor applications
Long Life: 1,000,000 mechanical cycles
Easy Installation: Simple mounting and wiring
Insurance Requirements: Many insurance companies require supervisory switches on sprinkler system valves as a condition of coverage. Properly installed and maintained supervisory switches like the MA-OSY-1 can lead to insurance premium reductions by demonstrating proactive fire protection system maintenance and monitoring.
