Pressure Switch 836T – Allen Bradley
Vacuum — Inches of mercury (in. Hg) vacuum (negative pressure).
Operating range adjustment screw — This screw is used to adjust the trip setting by varying the force
of the main spring.
Differential adjustment screw — This screw is used to adjust reset setting by varying the force of the
differential blade spring.
Pressure media — There are many types of pressure media that can be controlled. Examples include
air, water, hydraulic fluids, and other types of gases and liquids. The type of media and the maximum
system pressure will determine the type of actuator used for the pressure control application. See
Pressure Control Selection.
Pressure connection — Common standard types of pressure connections used in control systems are
1/4 in. and 3/8 in. N.P.T. female pipe threads. SAE 7/16 and SAE 9/16 O-ring boss seals are also
available (piston versions only).
Contact configuration — Bulletin 836T controls are available with either a 2-circuit or 4-circuit contact
block. See Contacts.
Style D
Style D — pressure difference controls adjustable system difference range — The adjustable
operating range for a pressure difference control.
System difference pressure bushing — This bushing is used to adjust the trip setting by varying the
force on the main spring.
Trip setting — Desired difference in pressure between the two bellows at which value the contacts
transfer from their normal state to a changed state. This occurs in one of the following conditions:
The pressure in the bottom bellows is higher than the pressure in the top bellows by a value equal to
the trip setting.
The pressure in the bottom bellows remains constant and the pressure in the top bellows decreases
by a value equal to the trip setting.
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