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Pressure Switch 836T – Allen Bradley
Technical Data
Technical Terms
Adjustable operating range — Total span
within which the contacts can be adjusted to
trip and reset.
Trip setting — Higher pressure setting at
which value the contacts transfer from their
normal state to a change state.
Reset setting — Lower pressure setting at
which value the contacts return to their
normal state.
Adjustable differential — Difference between the trip and reset values
Minimum differential — When the differential is set to the lowest possible difference between trip and
reset.
Maximum differential — When the differential is set to the highest possible difference between trip
and reset.
Max. occasional surge pressure — Maximum surge pressure that can be applied to the actuator. Surges
or transients can occur during start-up and shut-down of a machine or system. Expressed in
milliseconds, complex electronic instrumentation is required to measure the varying amplitude,
frequency, and duration of this wave form. Extreme surges that occur approximately 8 times in a 24-
hour period are negligible.
Maximum line pressure — Maximum sustained pressure that can be applied to the actuator without
permanent damage. The control should not be cycled at this pressure. Note: Does not apply to piston
type controls.
psi — Pounds per square inch gauge (positive pressure). Devices listed are in gauge pressure units which
use atmospheric pressure as a reference. Atmospheric pressure at sea level is approximately 14.7 psi or
30 in. Hg.
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Table of Contents
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Summary of Contents for Allen-Bradley 836T
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Page 1: Technical Data
Pressure Switch 836T – Allen Bradley Technical Data Technical Terms Adjustable operating range — Total span within which the contacts can be adjusted to trip and reset. Trip setting — Higher pressure setting at which value the contacts transfer from their normal state to a change state. - Page 2 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.
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Page 3: Theory Of Operation
Graphics to Illustrate Technical Terms Theory of Operation Bulletin 836T Pressure Controls are designed to open or close electrical circuits in response to changes in pneumatic (air or gas) or hydraulic (oil or non-corrosive liquids) pressure. Piston controls are not intended for use with air or water. - Page 4 Pressure Switch 836T – Allen Bradley The lever assembly also includes a virtually friction-free over-center toggle arrangement, providing positive snap action to the contact block for long contact life. As pressure falls, force on the differential spring increases and contacts return to their normal state — this is referred to as reset setting.
- Page 5 Pressure Switch 836T – Allen Bradley Applications for Control Pressure controls can be used to either control or monitor a machine or process. (Figure 3) shows a typical control application. Here, pressure is controlled within predetermined high and low values.
- Page 6 Pressure Switch 836T – Allen Bradley Control Setting — Style T Pressure Controls Allen-Bradley controls are designed for ease of setting to help minimize installation time. Standard pressure controls shipped from the factory are set at the maximum operating range and minimum differential.
- Page 7 Trip and reset adjustment for pressure controls Mounting without Removing Cover Bulletin 836T controls can be mounted without removing the front cover. This helps prevent foreign materials from entering the opened enclosure during the interval between mounting and wiring of the...
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