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Top worx 81-20526-A4 - Explosion-Proof Valve Position - 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 81-20526-A4 is a rugged, non-contact valve position indicator designed for industrial automation applications requiring precise and reliable valve status monitoring in extreme environments. Constructed with corrosion-resistant 316 stainless steel housing (IP66/IP67-rated), this device operates flawlessly in harsh conditions, including exposure to moisture, dust, vibration, and temperatures ranging from -40°C to +85°C.
Utilizing advanced magnetic Hall Effect sensing technology, it detects valve positions (open/closed or intermediate states) without mechanical contact, ensuring long-term accuracy and minimal maintenance. Compatible with ball, butterfly, and gate valves, the 81-20526-A4 is ideal for oil and gas, chemical processing, water treatment, and power generation industries.
- Output Signals: Dual SPDT mechanical switches (5 A @ 250V AC) or configurable proximity sensors (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 3 compliance
- Mechanical Life: >2 million cycles
| Parameter | Specification |
|---|---|
| Product Type | Valve Position Limit Switch (Mechanical Actuation) |
| Model Number | 81-20526-A4 |
| Actuation Type | Cam-operated mechanical switch |
| Number of Switches | 4 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) |
The 81-20526-A4 is extensively used in oil and gas pipelines to monitor valve positions in remote or hazardous locations, ensuring safe fluid flow control and leak prevention. In chemical plants, it provides critical feedback for valves handling corrosive or high-purity media. Water treatment facilities deploy it to track gate and butterfly valve positions in pumping stations, while power plants rely on it for steam valve monitoring in turbines and boilers.
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, where precise valve control in sterile environments is essential.
- Non-Contact Sensing: Magnetic Hall Effect technology eliminates mechanical wear, enabling maintenance-free operation
- Enhanced Durability: 316 stainless steel construction resists corrosion, high-pressure washdowns, and abrasive conditions
- Universal Compatibility: Operates on 24-240V AC/DC power and integrates seamlessly with PLCs, DCS, and SCADA systems
- Safety Compliance: ATEX/IECEx and SIL 3 certifications for use in Zone 1/21 hazardous areas
- Field Adjustability: Tool-free cam settings and modular design allow quick calibration for diverse valve configurations
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.
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