Allen-Bradley 836-C9 Style C Pressure Control Switch

Allen-Bradley 836-C9 Style C Pressure Control Switch

Configured for pressure-actuated pilot circuit switching, the Allen-Bradley 836-C9 (836-C9 pressure control switch) monitors pneumatic or hydraulic pressure through a copper alloy bellows and SPDT snap-action contacts. The device provides an adjustable operating range of 35 to 375 psi with a maximum line pressure of 900 psi.

Hardware Specifications

Electromechanical Pressure Switching Characteristics

The 836-C9 uses an external copper alloy bellows to convert applied pressure into mechanical contact movement. The pressure element operates the SPDT snap-action contact block when the configured pressure threshold is reached.

The operating range is specified from 35 to 375 psi, while the maximum line pressure is rated at 900 psi. Differential adjustment is performed through the calibration wheel identified as 836C9 in the supplied documentation.

The 1/4 inch NPT female pressure port provides the mechanical interface between the monitored pressure circuit and the bellows assembly. Contact output is provided through an SPDT arrangement for pilot-duty control circuits.

Frequently Asked Questions (FAQ)

Q: Is the 836-C9 a solid-state pressure transmitter?

A: No. The 836-C9 is an electromechanical pressure control switch using a copper alloy bellows and snap-action contacts.

Q: What electrical load can the contact block switch?

A: The supplied specification lists 5 A at 240 VAC and 3 A at 600 VAC for pilot-duty operation.

Q: Can the pressure differential be adjusted?

A: Yes. The supplied data identifies an adjustable differential setting using the calibration wheel.

Field Installation Guidelines

• Verify that the pressure source remains within the specified 35 to 375 psi operating range during normal operation.
• Confirm that the connected pressure circuit cannot exceed the stated 900 psi maximum line pressure.
• Match the installed pressure fitting to the 1/4 inch NPT female port without applying excessive mechanical torque.
• Use compatible sealing practices for the monitored medium and maintain a leak-free pressure connection.
• Keep pressure tubing mechanically supported to prevent vibration or external loading from reaching the bellows assembly.
• Route control wiring separately from high-energy conductors where practical to reduce electrical interference.
• Connect the SPDT contacts according to the required normally open or normally closed control logic.
• Verify the connected load against the specified pilot-duty contact ratings before energizing the circuit.
• Confirm the enclosure configuration and environmental suitability before installation in the intended panel or machinery location.
• Perform pressure switching verification after installation by gradually changing applied pressure and observing the contact transition.
• Adjust the differential only through the designated calibration mechanism and verify the resulting switching points against the required control sequence.
• Do not apply electrical power to the switch as a substitute for mechanical pressure verification.