1. Product Overview: Topworx 81-20516-A2 Valve Position Indicator
The Topworx 81-20516-A2 is a robust, non-contact valve position indicator designed for industrial automation applications requiring reliable monitoring of valve status in harsh operating environments. Built with a durable 316 stainless steel housing (IP66/IP67-rated), this device withstands extreme conditions such as moisture, dust, vibration, and temperature fluctuations (-40°C to +85°C). It employs magnetic Hall Effect sensing technology to detect valve positions (open/closed) without mechanical contact, ensuring long-term accuracy and minimal maintenance. Compatible with various valve types, including ball, butterfly, and gate valves, the 81-20516-A2 is ideal for use in oil and gas, chemical processing, water treatment, and power generation industries.
2. Key Technical Specifications
- Output Signals: SPDT mechanical switch (5 A @ 250V AC) or proximity sensor (NPN/PNP).
- Supply Voltage: 24–240V AC/DC (universal input).
- Enclosure Rating: IP66/IP67, NEMA 4X.
- Housing Material: 316 stainless steel.
- Operating Temperature: -40°C to +85°C.
- Connection Type: 1/2" NPT conduit entry.
- Certifications: ATEX/IECEx (Zone 1/21), SIL 2 compliance.
- Mechanical Life: >1 million cycles.
3. Industrial Applications and Use Cases
The 81-20516-A2 is widely used in oil and gas pipelines to monitor valve positions in remote or hazardous locations, ensuring safe fluid flow control. In chemical plants, it provides critical feedback on valve status for handling corrosive or abrasive media. Water treatment facilities deploy it to track gate and butterfly valve positions in pumping stations, while power generation plants rely on it for steam valve monitoring in turbines. Its ATEX/IECEx certification makes it suitable for explosive atmospheres, such as LNG terminals and fuel storage areas. Additionally, it supports HVAC systems and pharmaceutical manufacturing for precise valve control in sterile environments.
4. Competitive Advantages and Unique Features
- Non-Contact Sensing: Magnetic Hall Effect technology eliminates mechanical wear, enabling maintenance-free operation.
- Corrosion Resistance: 316 stainless steel construction resists harsh chemicals, saltwater, and high-pressure washdowns.
- Universal Compatibility: Operates on 24–240V AC/DC power and integrates seamlessly with PLCs, DCS, and SCADA systems.
- Safety Compliance: ATEX/IECEx and SIL 2 certifications for hazardous area deployments (Zone 1/21).
- Field Adjustability: Tool-free cam settings allow quick calibration for diverse valve configurations.
5. Functional Capabilities and Operational Benefits
The 81-20516-A2 delivers precise valve position feedback, triggering alarms or automated shutdowns during system malfunctions. Its dual SPDT switch outputs support redundant control loops, enhancing operational safety in critical processes. The IP66/IP67 rating ensures reliable performance in flooded or dusty environments, reducing unplanned downtime. By replacing mechanical limit switches, it lowers lifecycle costs and improves system uptime. The integrated LED status indicator simplifies troubleshooting, while universal voltage compatibility streamlines integration into both legacy and modern control systems. These features make it a cost-effective, future-proof solution for Industry 4.0 automation upgrades.
| Parameter | Specification |
| Product Type | Valve Position Limit Switch (Mechanical Actuation) |
| Model Number | 81-20516-A2 |
| Actuation Type | Cam-operated mechanical switch |
| Number of Switches | 2 SPDT (Single Pole Double Throw) switches |
| Electrical Rating | 10 A @ 120–240 V AC/DC; 5 A @ 480 V AC |
| Contact Material | Silver alloy (high durability for frequent switching) |
| Housing Material | Aluminum enclosure with epoxy coating (corrosion-resistant) |
| Protection Rating | IP66/IP67 (dustproof and waterproof) |
| Ambient Temperature | –40°C to +85°C (–40°F to +185°F) |
| Connection Type | 1/2" NPT conduit entry or M20 × 1.5 cable gland |
| Switch Adjustment | Adjustable cam settings for precise valve position feedback |
| Mechanical Life | ≥ 1 million cycles |
| Electrical Life | ≥ 100,000 cycles (at rated load) |
| Certifications | CE, ATEX/IECEx (optional, check suffix), RoHS, UL Listed |
| Mounting | Direct mounting to valve stem or actuator (NEMA 4X/7/9 compliant) |
| Enclosure Rating | Explosion-proof (ATEX/IECEx variants available) |
| Special Features | - Dual-sealed contacts for harsh environments
- Field-adjustable cams
- Visual position indicator |
Packaging & Shipping
Company Information
Xiamen ZhiCheng Automation Technology Co., Ltdit is a leading global supplier of control system components. We specialize in control systems and drives.
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With many years of experience in the industrial sector, we consistently deliver the highest quality of spare parts.which make sure that all this jobs are
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