836-C64E Allen‑Bradley Electromechanical pressure control switch

Product Detailed Description

The Allen-Bradley 836-C64E is an electromechanical pressure control switch from the Bulletin 836 series, manufactured by Rockwell Automation. It is a Style C device featuring an external Type 316 stainless-steel bellows actuator, designed for precise pressure sensing in demanding industrial environments. This model includes a combined Type 7 & 9 (hazardous locations, dust-ignition proof) and Type 4 & 13 (watertight, oil-tight, and corrosion-resistant) enclosure made of aluminum with specialized gaskets and O-rings for superior moisture and dust protection. It is rated for Class I Groups C and D, Class II Groups E, F, and G, and Class III hazardous locations.

The control operates using snap-action silver contacts for reliable switching, with independently adjustable operating range and differential settings via external screws. It senses pressure changes in pneumatic and hydraulic systems, triggering electrical contacts to open or close circuits. Compatible media include air, water, hydraulic fluids, vapors, noncorrosive gases, and corrosive liquids/gases suitable for Type 316 stainless steel. The device features straight in-line, friction-free construction for consistent performance regardless of mounting orientation, and complies with standards such as UL 508, UL 698 (Haz. Loc.), UL 1604 (Haz. Loc.), CSA 22.2 No. 14, NEMA ICS-2, and IEC 529/IP2X.

Product Parameters

The following table summarizes the key specifications for the 836-C64E:

Factory settings are at maximum range and minimum differential; custom settings available on 836-_C models with ±1% tolerance.

Product Advantages

• Precision and Reliability: Independently adjustable range and differential allow exact trip/reset settings, with ±1% repeat accuracy and high-force snap-action contacts for dependable operation even at low voltages (e.g., 24V DC I/O).
• Durability in Harsh Environments: Type 316 stainless-steel bellows resists corrosion from aggressive media; hazardous-location enclosure (Type 7 & 9 + 4 & 13) ensures safety in explosive/dusty areas without needing additional modifications.
• Versatile Design: Friction-free bellows construction performs consistently at any mounting angle; supports a wide media range (corrosive/noncorrosive fluids/gases) and includes accessories like pulsation snubbers and isolation traps for extended life.
• Ease of Use and Maintenance: External adjustment screws for simple field calibration; clear inspection cover and finger-safe shield (IP2X); long mechanical life when operated in optimal range (30–80%).
• Compliance and Flexibility: Meets rigorous UL/CSA standards; options for manual reset, pilot lights (LED/neon), and tamper-resistant features enhance customization for specific needs.

Precautions

• Pressure Limits: Do not exceed 450 psi maximum line or surge pressure; limit surges to 8 per 24 hours to avoid damage—use external snubbers for high-vibration applications.
• Temperature Considerations: Below 32 °F (0 °C), prevent freezing of moisture or fluids in the bellows, as solidification can impair operation; avoid exceeding 150 °F (66 °C) operating temperature.
• Installation and Adjustment: Ensure compatibility of media with stainless steel; adjusting differential minimally affects trip point, but range screw shifts both equally—test post-adjustment. For low-energy circuits, protect in enclosures to maintain contact fidelity.
• Hazardous Locations: Type 7 & 9 enclosures are not CE compliant and not fully moisture-proof for outdoor use; follow local codes for wiring and grounding.
• General Safety: Cycle only in recommended range to maximize life; for factory-customized units, specify terminal polarity, pressure direction, and values accurately. Not suitable for oxygen/nitrous oxide without modifications. Consult Rockwell Automation for modified controls.

Product Applications

The 836-C64E is ideal for heavy-duty industrial settings requiring robust pressure monitoring in hazardous or corrosive conditions. Typical uses include:

• Pneumatic and Hydraulic Systems: Monitoring and controlling air compressors, hydraulic presses, and fluid transfer lines to prevent overpressure or low-pressure failures.
• Process Protection: High/low-pressure alarms in manufacturing equipment, protecting machinery, personnel, and processes from coolant/lubricant loss or surges.
• Hazardous Environments: Oil & gas, chemical processing, and mining operations for safe detection in explosive atmospheres (e.g., Class I/II locations).
• Liquid Level and Vacuum Control: Water treatment plants, vacuum pumps, and level sensing in tanks using compatible media like water or corrosive vapors.
• General Industrial Automation: Integration into control panels for machine tools, transportation systems, and heavy equipment where precise, reliable switching is essential for pneumatic/hydraulic circuits.