Description
Product Name: 849A-ZOB Allen Bradley Output module
Product details:
The 849A-ZOB is a series of industrial control components known as Pneumatic Timing Relays. These electro-pneumatic devices are designed to provide a time delay function in control circuits.
Product Description
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Type: Pneumatic Timing Relay
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Delay Type: Typically On-Delay (Timing begins when the coil is energized, and the contacts change state after the preset time).
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Mechanism: It uses an internal pneumatic bellows system to control the switching of electrical contacts. The time delay is determined by controlling the release of air from the bellows using an adjustable needle valve.
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Adjustability: The time delay is user-configurable via a screw-type adjustment knob.
📊 Product Parameters (Typical/Example Specifications)
| Parameter | Value Range (Example) |
| Type of Delay | On-Delay |
| Time Range | $0.05$ to $180$ Seconds |
| Maximum Voltage | Up to $600\text{V AC}$ (Pilot Duty) |
| Contact Rating | Up to $10\text{A}$ (Pilot Duty) |
| Nominal Frequency | $50$ to $60\text{ Hz}$ |
| Type of Electrical Contact | Normally Open (NO) or Normally Closed (NC) – Varies by exact model |
| Coil Voltage | Varies by full part number (e.g., $120\text{V AC}, 480\text{V AC}$) |
✨ Product Advantages (Product Strengths)
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Immunity to Electrical Interference: A primary advantage is that the pneumatic timing mechanism is inherently immune to high levels of electrical noise and interference, which can cause electronic timing relays to malfunction.
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Suitability for Hazardous Environments: They are commonly employed in hazardous or explosive applications (like oil, natural gas, or chemical processing) where the use of a standard electrical or electronic timer might be unsafe. They are often used as a spark suppression or fire/explosion prevention device.
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Robust and Reliable: The design is generally robust, contributing to long-lasting performance and reliability in harsh industrial conditions.
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Temperature and Humidity Resistance: The relay’s accuracy is often not compromised by typical temperature variations or high levels of humidity.
⚠️ Important Considerations (Notes/Precautions)
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Legacy System: This product line is often associated with legacy systems and applications, and some specific part numbers may be discontinued by the manufacturer. Availability may rely on surplus or aftermarket suppliers.
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Adjustment Accuracy: The time delay is set mechanically, and while reliable, it may require careful adjustment to achieve precise timing.
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Application Environment: Ensure the relay’s specific coil voltage matches your control circuit requirements.
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Installation: Installation should be performed by qualified personnel, following all local electrical codes and safety regulations, particularly in hazardous locations.
🛠️ Product Applications
The Allen-Bradley 849A-ZOB Pneumatic Timing Relay is an essential component in industrial automation and control, particularly where safety and reliability are paramount.
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Oil & Gas Industry: Used in installations involving flammable materials for control and safety systems.
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Chemical Processing: Employed in timed operations and safety interlocks within chemical plants.
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Manufacturing Automation: Suitable for controlling timed sequences in assembly lines and machine start-up/shut-down processes.
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Process Control: Used in applications that require timed delays, such as operating valves or initiating sequential steps in a process.
Advantages: Foxboro, OVATION, TRICONEX, Allen-Bradley, ABB, Motorola, Siemens Moore, Ge Fanuc, Woodward, Bently Nevada and other major import brands!
We have the same series of models in stock. If you don’t find the model you need, please contact us and we will provide you with an official quotation！
Colour：new Warranty: 12 months
Lead Time：3-day working day Country of origin: Sweden
Price: Please contact us Product weight：0.515kg
Shipping Port: Xiamen, China
Payment: Bank of Chicago, Bank of Singapore
Express cooperation: fedex, DHL, UPS and your express account
Service: Professional Sales provides 24 hours /7 days online service
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