AB 836-C7 Electromechanical Pressure Switch

Product Detailed Description

• Functionality: The 836-C7 operates by converting a hydraulic or pneumatic pressure input into an electrical contact output. When the pressure in the monitored system reaches a user-adjustable setpoint, a mechanical diaphragm or piston within the switch actuates a snap-action electrical contact. This contact can then be used to initiate or stop a process, trigger an alarm, or control another device.

• Adjustable Operating Range: Key feature of this switch is its adjustable operating pressure range, allowing users to set the precise pressure at which the switch will activate or deactivate.

• Differential (Hysteresis) Adjustment: It typically includes an adjustable differential, meaning the pressure difference between the switch's actuation (make) point and de-actuation (break) point can be controlled. This prevents rapid cycling of the switch around the setpoint.

• Robust Construction: Designed for industrial applications, it features a sturdy construction, often with cast enclosures, making it resistant to vibration, shock, and contaminants commonly found in manufacturing environments.

• Mechanical Operation: Being electromechanical, it relies on physical movement and contacts, offering a simple and reliable operation that is less susceptible to electrical noise than some electronic sensors.

• Electrical Contacts: It provides electrical contacts (typically single-pole double-throw, SPDT, or similar configurations) for integration into control circuits.

Product Parameters

(Note: Specific parameters may vary slightly based on the exact manufacturing variant or revision. Always refer to the official Allen-Bradley/Rockwell Automation documentation for definitive specifications.)

• Switch Type: Electromechanical Pressure Switch, Style C.

• Adjustable Operating Pressure Range: Typically 4 to 150 PSI (Pounds per Square Inch) or approximately 0.28 to 10.3 bar.

• Maximum Line Pressure (Occasional): Up to 300 PSI (20.7 bar) occasionally, 375 PSI (25.85 bar) burst pressure.

• Differential (Adjustable): Typically 2 to 18 PSI (0.14 to 1.24 bar).

• Electrical Ratings (Control Circuit):

• AC: Up to 125 VA (e.g., 24V to 600V AC).

• DC: Up to 57.5 VA (e.g., 125V to 250V DC).

• Specific current ratings (e.g., 3A at 240V AC) are often specified.

• Conduit Connection: Common sizes like 1/4 inch FNPT (Female National Pipe Taper) for connecting to the pressure line.

• Environmental Conditions:

• Storage Temperature: Typically -22 to 200 °F (-30 to 93 °C).

• Operating Temperature: Varies, but designed for industrial conditions.

• Enclosure Type: Often available without a specific enclosure (open type for integration into panels/boxes) or with various NEMA/IP rated enclosures.

• Sensor Type: Diaphragm or piston based (electromechanical).

Product Advantages

• Rugged Durability: Built to withstand harsh industrial environments, including shock, vibration, and temperature fluctuations.

• Reliable Operation: Electromechanical design provides a robust and dependable switching action.

• Adjustability: Easily adjustable setpoint and differential pressure allow for precise control tailored to specific application needs.

• Versatility: Suitable for a wide range of fluid pressures (liquids and gases) within its specified range.

• Cost-Effective: Often a more economical solution for simple pressure switching applications compared to electronic transducers with complex outputs.

• Simple Wiring: Straightforward electrical connections for easy integration into control circuits.

• Established Product Line: Part of the long-standing Bulletin 836 series, indicating a proven design and track record.

Precautions

• Correct Pressure Range Selection: Ensure the operating and maximum system pressures fall within the switch's specified ranges to prevent damage to the switch.

• Media Compatibility: Verify that the wetted materials of the pressure switch (the parts exposed to the fluid) are compatible with the media being monitored to prevent corrosion or degradation.

• Proper Installation: Install the switch securely in the correct orientation as specified by the manufacturer. Ensure all pressure connections are properly sealed to prevent leaks.

• Electrical Wiring: Follow all local and national electrical codes. Ensure correct wiring of the electrical contacts according to the control circuit diagram. Disconnect power before wiring or maintenance.

• Vibration and Pulsation: While robust, excessive vibration or severe pressure pulsations can affect switch life or accuracy. Consider using snubbers or remote mounting if necessary.

• Calibration/Adjustment: Perform initial setup and any necessary adjustments of the setpoint and differential carefully, following the manufacturer's instructions. Verify the settings with a calibrated pressure gauge.

• Environmental Protection: If the specific 836-C7 variant does not include an integral enclosure (e.g., "no enclosure" type), ensure it is installed within a suitable NEMA/IP rated enclosure to protect it from dust, moisture, and other contaminants.

Product Applications

The Allen-Bradley 836-C7 pressure switch is widely used in various industrial and commercial applications for pressure monitoring and control:

• Hydraulic Systems: Monitoring hydraulic cylinder pressure, pump discharge pressure, or accumulator pressure to control system operations.

• Pneumatic Systems: Controlling air compressors, monitoring air line pressure, or activating pneumatic actuators at specific pressure levels.

• Lubrication Systems: Monitoring lubricant pressure to ensure adequate supply to critical machinery.

• Pump Control: Starting or stopping pumps based on system pressure (e.g., maintaining pressure in a water supply system).

• Compressor Control: Unloading compressors or cycling them based on tank pressure.

• Filtering Systems: Monitoring differential pressure across filters to indicate when they need cleaning or replacement.

• Process Industry: General pressure alarming and control in various manufacturing and processing plants.

• HVAC Systems: Monitoring refrigerant pressure in chillers or air pressure in ductwork.

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