Allen-Bradley 836T - User Manual

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.

Allen-Bradley 836T Specifications

General

Brand	Allen-Bradley
Model	836T
Category	Switch
Language	English

Summary

Technical Data

Technical Terms

Definitions of key operational and specification terms for the pressure switch.

Style D

Style D Pressure Difference Controls

Description of Style D pressure difference controls and their adjustable system difference range.

System difference pressure bushing

Bushing used to adjust the trip setting by varying force on the main spring in Style D controls.

Trip setting (Style D)

Desired pressure difference between two bellows for contacts to change state in Style D controls.

Theory of Operation

Bulletin 836 T Pressure Controls

Explanation of how 836T pressure controls open/close circuits based on pneumatic or hydraulic pressure changes.

Applications for Control

Typical Control Application

Pressure controlled within predetermined high and low values for machine or process operation.

Typical Monitoring Application

Pressure monitored between high/low values, signaling when a preset limit is exceeded.

Control Setting - Style T Pressure Controls

Step 1 Adjust trip setting

Procedure to adjust the trip setting using the operating range adjustment screw on Style T controls.

Step 2 Adjust reset setting

Procedure to adjust the reset setting using the differential adjustment screw on Style T controls.

Mounting without Removing Cover