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Top worx 81-20516-A3 - Explosion-Proof Position Sensing - Industrial ATEX Stainless Steel - Limit Switch
| MOQ: | 1 |
| Price: | USD 100-10000/Piece |
| Standard Packaging: | 50*50*50mm |
| Delivery Period: | 3-7 |
| Payment Method: | T/T |
| Supply Capacity: | 1/piece in stock |
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The Topworx 81-20516-A3 is a rugged, non-contact valve position indicator designed for industrial automation applications requiring precise valve status monitoring in harsh environments. Built with a 316 stainless steel housing (IP66/IP67-rated), this device operates reliably in extreme conditions, including exposure to moisture, dust, vibration, and temperatures ranging from -40°C to +85°C. Utilizing magnetic Hall Effect sensing technology, it detects valve positions (open/closed) without mechanical wear, ensuring long-term accuracy and reduced maintenance. Compatible with ball, butterfly, and gate valves, the 81-20516-A3 is ideal for oil and gas, chemical processing, water treatment, and power generation industries.
- 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
The 81-20516-A3 is widely used in oil and gas pipelines to monitor valve positions in remote or hazardous locations, ensuring safe flow control. In chemical plants, it provides critical feedback on valve status for corrosive fluid handling systems. Water treatment facilities deploy it to track gate valve positions in pumping stations, while power 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 cleanroom environments.
- Non-Contact Sensing: Magnetic Hall Effect technology eliminates mechanical wear, ensuring maintenance-free operation
- Corrosion Resistance: 316 stainless steel construction withstands harsh chemicals, saltwater, and abrasive environments
- Universal Compatibility: Operates on 24-240V AC/DC power and integrates with PLCs, DCS, and SCADA systems
- Safety Compliance: ATEX/IECEx and SIL 2 certifications for use in hazardous areas (Zone 1/21)
- Field Adjustability: Tool-free cam settings enable quick calibration for different valve types
| Parameter | Specification |
|---|---|
| Product Type | Valve Position Limit Switch (Mechanical Actuation) |
| Model Number | 81-20516-A3 |
| Actuation Type | Cam-operated mechanical switch |
| Number of Switches | 3 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) |
Xiamen ZhiCheng Automation Technology Co., Ltd is a leading global supplier of control system components. We specialize in control systems and drives.
With many years of experience in the industrial sector, we consistently deliver the highest quality of spare parts which make sure that all jobs are perfectly executed.
We are major in PLC, Sensors, HIM, Transmitters.
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