Bulletin 836 Pressure Controls, General Industrial

Product Overview


Bulletin 836 Pressure Controls

Click to enlarge - 836-15_1-1a



Click to enlarge - 836-15_1-1


Description

Bulletin 836 Pressure Controls are designed for general industrial use to control and detect pressure. Allen-Bradley Bulletin 836 Pressure Controls can be used in pneumatic and hydraulic systems. Pressure controls use copper alloy or stainless steel bellows. The design and high-quality components provide long life operation with air, water, oil, non-corrosive liquids, vapors, gases, and some corrosive liquids and gases.

Pressure controls feature snap-action precision switches equipped with silver contacts. The straight in-line and relatively friction-free construction provides accurate and consistent operation regardless of the angle at which the controls are mounted. Pressure controls are designed for easy adjustment of both trip and reset pressures.

Allen-Bradley Bulletin 836 Pressure Controls are used in many types of industries and applications. They can be used to control pneumatic systems, maintaining preset pressures between two values. Pressure controls can be used to detect overpressures of gases or liquids to protect machines, processes, and personnel. They can also be used to detect low pressures to protect equipment from loss of coolants and lubrication.

Bulletin 836 Pressure Controls are offered in a variety of styles to meet a wide range of applications. The devices are available in Type 1, 4 & 13, 4X, 7 & 9, and 4 & 13 combined and open type without enclosure for panel mounting. Pressure controls have a wide variety of contact modifications to meet most control circuit requirements. The controls have adjustable pressure ranges from 30 in. Hg vacuum…900 psi with corresponding differentials. Accessories and modifications are available to tailor the device to meet most application requirements.


Applications


Style A — Small Size, Internal Copper Alloy Bellows

Click to enlarge - 836-15_2-1


Style A


Style C — Wider Ranges, External Bellows

Click to enlarge - 836-15_2-2


Style C


Copper Alloy Bellows


Type 316 Stainless Steel Bellows


Refrigeration Controls - See Refrigeration Controls

Click to enlarge - 836-15_1-4


Style H


Style L


Style P


Standards Compliance

UL 508
UL 698 (Haz. Loc.)
UL 1604 (Haz. Loc.)
CSA 22.2 No. 14
NEMA ICS-2
IEC 529/IP2X


Certifications

Click to enlarge - 803-13-1-2


File and Guide Numbers
Bulletin 836


UL CSA
File Number Guide Number File Number Class
E14842 NKPZ LR1234 3211-03
E53048 (Haz. Loc.) NOWT LR11924 (Haz. Loc.) 3218-05
Hazardous Location Enclosure not CE compliant. All other enclosed devices are CE compliant
  

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 changed 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 pressure difference between trip and reset.

Maximum differential — When the differential is set to the widest pressure difference between trip and reset.

Maximum occasional surge pressure — Maximum surge pressure that can be applied to the actuator. Surges or transients can occur during startup and shutdown 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 eight times in a 24-hour period are negligible.


Maximum line pressure — Maximum sustained pressure that can be applied to the bellows without permanent damage. The control should not be cycled at this pressure.

Positive pressure — Any pressure more than 0 psi. See Figure 2.

  • Trip setting — Increasing pressure setting when contacts change state.


  • Reset setting — Decreasing pressure setting when contacts return to their normal state.


  • Vacuum (negative pressure) — Any pressure less than 0 psi, inches of Hg vacuum. See Figure 2.

  • Trip setting — Decreasing vacuum setting when contacts change state.


  • Reset setting — Increasing vacuum setting when contacts return to their normal state.


  • psi — Pounds per square inch. 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.

    Operating range adjustment acrew — 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 are controlled. Examples include air, water, hydraulic fluids and other types of gases and liquids. The type of media and maximum system pressure will determine the type of actuator used for the pressure control application. See Pressure Control Selection.

    Pressure connection — Common types of pressure connections used in control systems are 1/4 in. and 3/8 in. internal pipe threads, and 7/16 in. — 20 SAE copper tubing.

    Contact configuration — There are many types of contact configurations available. Bulletin 836 Style A and C pressure controls offer a wide variety of contact configurations for both automatic operation and manual reset. See Modifications.


    Figure 1
    Graphics to illustrate technical terms


    Click to enlarge - 836-15_3-1


    Figure 2
    Positive pressure or vacuum


    Click to enlarge - 836-15_3-2


    Theory of Operation

    Bulletin 836 Pressure Controls are designed to open or close electrical circuits in response to changes in pneumatic (air or gas) or hydraulic (water or oil) pressure. Figure 3 is a simplified drawing of a pressure control.

    The system pressure is connected to the control at the pressure connection. The system pressure is applied directly to the bellows. As pressure rises, the bellows exerts force on the main spring. When the threshold force of the main spring is overcome, it transfers the motion to the contact block, causing the contacts to actuate — this is referred to as the trip setting. As pressure decreases, the main spring will retract, causing the secondary differential blade spring to activate
    and return the contacts to their normal state — this is referred to as reset setting.

    Varying the force of the main spring (by turning the operating range adjustment screw) determines where the contacts will trip. Varying the force of the secondary differential blade spring (by turning the differential adjustment screw) determines where the contacts will reset.


    Figure 3
    Basic mechanical structure


    Click to enlarge - 836-15_4-1


    Applications for Control

    Pressure controls can be used to either control or monitor a machine or process. Figure 4 shows a typical control application. Here, pressure is controlled within predetermined high and low values. Figure 5 shows a typical monitoring application. Here, pressure is monitored between a high and low value, signaling when a preset limit has been exceeded.

    Figure 4
    Typical control application


    Click to enlarge - 836-15_4-2


    Figure 5
    Typical monitoring application


    Click to enlarge - 836-15_4-3


    Control Settings

    Allen-Bradley controls are designed for ease of setting to help minimize installation time. Standard controls shipped from the factory are set at the maximum operating range and minimum differential. By following this simple two-step process, the control can be set to the specific requirements for each application. See Figure 6.

    Step 1 — Adjust trip setting
    The trip setting is achieved by turning the operating range adjustment screw. Turn the range screw counterclockwise to lower the trip setting, or clockwise to raise the trip setting. The approximate trip setting is shown on the indicating scale.
    Note: Turning the operating range adjustment screw will change both the trip and reset settings in virtually equal increments.

    Step 2 — Adjust reset setting
    The reset setting is achieved by turning the differential adjustment screw counterclockwise to increase the differential, or clockwise to decrease the differential.
    Note: Adjusting the differential has little or no affect upon the trip setting.


    Figure 6
    Trip and reset adjustment


    Click to enlarge - 836-15_5-1b


    Repeat Accuracy and Mechanical Life

    The design and construction of Bulletin 836 Styles A and C controls provide a typical repeat accuracy of + 0.5% or better. Repeat accuracy is based on percent of maximum range, evaluated from test data and calculated using the formula per ICS 2-225 standards.

    Repeat accuracy and mechanical life of bellows type controls is graphically illustrated in Figure 7. For general applications, controls selected where the contacts operate between 30…80% of the operating range and where the maximum line and surge pressures do not exceed the specified values will provide excellent life and repeat accuracy. For more specific applications, it is important to note that the controls are designed to operate below or above these values. However, there may be a small trade-off between the factors of repeat accuracy and mechanical life.


    Figure 7
    Repeat accuracy versus mechanical life graph


    Click to enlarge - 836-15_5-2


    Standard Contacts

    Snap-action contact operation
    Contact blocks are single-pole, double-throw and can be wired to open or close on increasing or decreasing pressures.

    Non-inductive ratings
    5 A, 240V
    3 A, 600V

    Control circuit ratings
    AC - 125 VA, 24…600V
    DC - 57.5 VA, 115…230V


    Standard Contact Wiring Configurations

    Single-pole double throw

    Click to enlarge - 836-15_6-1


    Note: NEMA does not rate contacts to switch low voltage and current.
    Bulletin 836 Styles A and C Pressure Controls are supplied with silver contacts. The devices are designed to deliver high-force snap action to the contacts. This provides exceptional contact fidelity at 24V DC I/O card current level entry when the control is protected in a suitable enclosure for the surrounding environment.


    Special Controls

    A large number of unlisted catalog modifications and complete devices are available for specific and OEM applications.

    Special controls and modification service is available to meet many applications unique to the OEM market.

    Please contact your local Rockwell Automation sales office or Allen-Bradley distributor for assistance with specific modified controls and accessories.


    Temperature Range

    Temperature range at +32 °F (0 °C) or below is based on the absence of freezing moisture, water, or other fluids that may solidify and impede operation of the control. Temperature ratings are as follows:

    Operating: –22… +150 °F
    (–30…+66 °C)
    Storage: –22…+200 °F
    (–30…+93 °C)

    Factory-Set Pressure Controls

    Rockwell Automation will factory set pressure control values to customer-specified values only if a Cat. No. 836-_C device is ordered. Catalog numbers ordered without the "C" suffix are set at
    the maximum operating range and minimum differential. See Factory Options.


    Pressure Control Selection

    The selection table below is an overview of the three types of Allen-Bradley Bulletin 836 Pressure Controls. Each type of control is suitable for use on many types of applications. Pressure ranges, pressure connections, enclosure types, and the compatibility of the actuator with different types of pressure media are given to assist in the selection of which type of control to use.

      836 Style A 836 Style C 836 Style C
    Actuator Type Internal Bellows,
    Copper Alloy
    External Bellows,
    Copper Alloy
    External Bellows,
    Stainless Steel Type 316
    Adjustable Operating Ranges 30 in. Hg Vacuum…375 psi 30 in. Hg Vacuum…900 psi 30 in. Hg Vacuum…375 psi
    Adjustable Differentials 2…95 psi 0.2…125 psi 0.4…80 psi
    Maximum Line Pressures up to 750 psi up to 1300 psi up to 650 psi
    Occasional Surge Pressures up to 850 psi up to 1600 psi up to 650 psi
    Pressure Media
    Air Ÿ Ÿ Ÿ
    Water Ÿ Ÿ Ÿ
    Hydraulic Fluids Ÿ Ÿ Ÿ
    Liquids:
    Corrosive⋆ 
        Ÿ

    Non-Corrosive
    Ÿ Ÿ Ÿ
    Gases:
    Corrosive⋆ 
        Ÿ
    Non-Corrosive Ÿ Ÿ Ÿ
    Enclosures
    Open Type Ÿ Ÿ Ÿ
    Type 1 Ÿ Ÿ Ÿ
    Type 4 & 13 Ÿ Ÿ Ÿ
    Type 4X   Ÿ Ÿ
    Type 7 & 9 and 4 & 13 Ÿ Ÿ Ÿ
    Pipe Connections
    Pressure Connection 7/16 in.-20 SAE Flare for 1/4 in. Copper
    Tubing
    1/4 in. N.P.T.F. Internal Pipe Thread or
    3/8 in. N.P.S.F. Internal Pipe connection
    (836-C1 and 836-C1A only)
    1/4 in. N.P.T.F.
    Internal Pipe Thread
      
    ⋆ Corrosive liquids and gases compatible with Type 316 Stainless Steel.

    Ordering Information

    Ordering Bulletin 836 Pressure Controls


    Build a Catalog Number

    How to Order

    Step 1:        Basic Device
    Select a catalog number for the basic device.
        See Product Selection.

    Step 2:        Modifications
    If required, add the appropriate modification suffix code(s) to the catalog number of the basic device.
        See Modifications.

    Step 3:        Accessories
    If required, select appropriate accessories.
        See
    Accessories.

    Step 4:        Factory Options
    Factory-set pressure controls.
        See Factory Options.


    Catalog Number Explanation

    Note: Catalog numbers must not include blank spaces.

    836 A    1    A    X9    C
         a    b    c    d    e

    a
    Style of Device
    Code Description
    A Internal Bellows
    C External Bellows

    b
    Pressure Specifications
    See "Pressure Specifications" Style H High Pressure—Copper Alloy Bellows⋆ .

    c
    Enclosure Type
    Code Description
    A Type 1
    E Type 7 & 9 and 4 & 13 Combined Metallic (Aluminum)
    J Type 4 & 13 Metallic (Aluminum)
    S Type 4X Non-Metallic
    None Without Enclosure

    d
    Modification
    Code Description
    X_ Add suffix codes in descending order whenever possible (see Modifications).

    e
    Customer Specified Trip and/or Reset Settings
    Code Description
    None Max. range/ min. differential
    C Customer specified trip/reset setting ⋆ 
    ⋆  The requested trip/reset setting must be within the adjustable operating and differential ranges for the pre-configured product, refer to Product Selection.

    Conversion Factors

    Conversion Factors (Rounded)
                          psi x 703.1 = mm/H2O
                          psi x 27.68 = in. H2O
                          psi x 51.71 = mm/Hg
                          psi x 2.036 = in. Hg
                          psi x 0.0703 = kg/cm2
                          psi x 0.0689 = bar
                          psi x 68.95 = mbar
                          psi x 6895 = Pa
                          psi x 6.895 = kPa
    Note:  psi — pounds per square inch (gauge)
     H2O at 39.2 °F/Hg at 32 °F
      

    Product Selection

    Build a Catalog Number


    Style A Internal Bellows —
    Copper Alloy Bellows⋆  With 7/16 in. — 20 SAE Flare for 1/4 in. Copper Tubing Connection


    Standard pressure controls shipped from the factory are set at the maximum operating range and minimum differential. For more information on standard pressure control settings and customer-specified pressure control settings, consult your local Rockwell Automation sales office or Allen-Bradley distributor.

    Click to enlarge - 836-15_2-1    Click to enlarge - 836-15_8-2
    Style A Internal Bellows —
    Copper Alloy, Type 1
       Style A Internal Bellows —
    Copper Alloy, Type 4 & 13

    Pressure Specifications Enclosure Type
    Adjustable Operating Range [in. Hg Vacuum…psi]‡  Adjustable Differential [psi] (Approximate Mid-Range Values) Maximum psi Open Type
    (Without Enclosure)
    Type 1
    Line Pressure Occasional Surge Pressure§  Cat. No. Cat. No.
    30 in. Vacuum…75 2…20♣  160 160 836-A1 836-A1A
    6…140 3…35 280 340 836-A2 836-A2A
    12…250 6…65 500 600 836-A3 836-A3A
    16…375 8…95 750 850 836-A4 836-A4A
      

    Style A Internal Bellows —
    Copper Alloy Bellows⋆  With 7/16 in. — 20 SAE Flare for 1/4 in. Copper Tubing Connection


    Standard pressure controls shipped from the factory are set at the maximum operating range and minimum differential. For more information on standard pressure control settings and customer-specified pressure control settings, consult your local Rockwell Automation sales office or Allen-Bradley distributor.

    Pressure Specifications Enclosure Type
    Adjustable Operating Range [in. Hg Vacuum…psi]‡  Adjustable Differential [psi] (Approximate Mid-Range Values) Maximum psi Type 4 & 13 Type 7 & 9 and 4 & 13∆ 
    Line Pressure Occasional Surge Pressure§  Cat. No. Cat. No.
    30 Vacuum…75 2…20♣  160 160 836-A1J 836-A1E
    6…140 3…35 280 340 836-A2J 836-A2E
    12…250 6…65 500 600 836-A3J 836-A3E
    16…375 8…95 750 850 836-A4J 836-A4E
      
    ⋆ Copper alloy bellows may be used on water or air, and other liquids or gases not corrosive to this alloy.
    ‡ For applications where settings approach 0 psi, select a control that has an adjustable range that goes into vacuum.
    § Transients (pulses) can occur in a system prior to reaching a steady-state condition. Surge pressures within published values generated during startup or shutdown of a machine or system, not exceeding eight times in a 24-hour period, are negligible.
    ♣ To determine differential in inches of mercury vacuum multiply value in table by 2.036 (or approximately 2).
    ∆ The combined Type 7 & 9 and 4 & 13 Hazardous Gas and Dust service enclosure is supplied with special gasket and O-ring seal to diminish/exclude moisture, fluids, and dust from entering the enclosure. Enclosures rated 7 & 9 only are not designed to restrict moisture from entering the enclosure, which is common to outdoor service. Enclosure is rated for the following environments:
    CLASS I Groups C,D
    CLASS II Groups E,F,G
    CLASS III

    Style C External Bellows —
    Copper Alloy Bellows⋆  With 1/4 in. N.P.T.F. Internal Pipe Connection


    Standard pressure controls shipped from the factory are set at the maximum operating range and minimum differential. For more information on standard pressure control settings and customer-specified pressure control settings, consult your local Rockwell Automation sales office or Allen-Bradley distributor.

    Click to enlarge - 836-15_2-2    Click to enlarge - 836-15_9-2
    Style C External Bellows —
    Copper Alloy, Type 1 With Pilot Light Option
       Style C External Bellows —
    Copper Alloy, Type 4 & 13

    Pressure Specifications Enclosure Type
    Adjustable Operating Range [in. Hg Vacuum…psi]‡  Adjustable Differential [psi] (Approximate Mid-Range Values) Maximum psi Open Type
    (Without Enclosure)
    Type 1 Type 4 & 13
    Line Pressure Occasional Surge Pressure§  Cat. No. Cat. No. Cat. No.
    12 in. Vacuum…8♦  0.2…2.5♣  25 30 836-C1 836-C1A
    30 in. Vacuum…10 0.4…6♣  65 75 836-C2 836-C2A 836-C2J
    0.8…30 0.5...6 80 80 836-C3 836-C3A 836-C3J
    30 in. Vacuum…45 1…12♣  175 190 836-C4 836-C4A 836-C4J
    2…80 1…12 190 210 836-C5 836-C5A 836-C5J
    30 in. Vacuum…100 2…25♣  300 375 836-C6 836-C6A 836-C6J
    4…150 2.5…25 300 375 836-C7 836-C7A 836-C7J
    6…250 4…45 500 650 836-C8 836-C8A 836-C8J
    35…375 6…80 900 1200 836-C9 836-C9A 836-C9J
    50…500 12…115 1300 1600 836-C10 836-C10A 836-C10J
    50…650 16…115 1300 1600 836-C11 836-C11A 836-C11J
    200…900 25…115 1300 1600 836-C12 836-C12A 836-C12J
      

    Style C External Bellows —
    Copper Alloy Bellows⋆  With 1/4 in. N.P.T.F. Internal Pipe Connection


    Standard pressure controls shipped from the factory are set at the maximum operating range and minimum differential.

    Pressure Specifications Enclosure Type
    Adjustable Operating Range [in. Hg Vacuum…psi]‡  Adjustable Differential [psi] (Approximate Mid-Range Values) Maximum psi Type 4X Type 7 & 9 and 4 & 13∆ 
    Line Pressure Occasional Surge Pressure§  Cat. No. Cat. No.
    12 in. Vacuum…8♦  0.2…2.5♣  25 30
    30 in. Vacuum…10 0.4…6♣  65 75 836-C2S 836-C2E
    0.8…30 0.5…6 80 80 836-C3S 836-C3E
    30 in. Vacuum…45 1…12♣  175 190 836-C4S 836-C4E
    2…80 1…12 190 210 836-C5S 836-C5E
    30 in. Vacuum…100 2…25♣  300 375 836-C6S 836-C6E
    4…150 2.5…25 300 375 836-C7S 836-C7E
    6…250 4…45 500 650 836-C8S 836-C8E
    35…375 6…80 900 1200 836-C9S 836-C9E
    50…500 12…115 1300 1600 836-C10S 836-C10E
    50…650 16…115 1300 1600 836-C11S 836-C11E
    200…900 25…115 1300 1600 836-C12S 836-C12E
      
    ⋆ Copper alloy bellows may be used on water or air, and other liquids or gases not corrosive to this alloy.
    ‡ For applications where settings approach 0 psi, select a control that has an adjustable range that goes into vacuum.
    § Transients (pulses) can occur in a system prior to reaching a steady-state condition. Surge pressures within published values generated during startup or shutdown of a machine or system, not exceeding eight times in a 24-hour period, are negligible.
    ♣ To determine differential in. Hg vacuum, multiply value in table by 2.036 (or approximately 2).
    ∆ The combined Type 7 & 9 and 4 & 13 Hazardous Gas and Dust service enclosure is supplied with special gasket and O-ring seal to diminish/exclude moisture, fluids, and dust from entering the enclosure. Enclosures rated 7 & 9 only are not designed to restrict moisture from entering the enclosure, which is common to outdoor service. Enclosure is rated for the following environments:
    CLASS I Groups C,D
    CLASS II Groups E,F,G
    CLASS III
    ♦ With 3/8 in. N.P.S.F. internal pipe connection.

    Style C External Bellows —
    Type 316 Stainless Steel Bellows⋆  With 1/4 in. N.P.T.F. Internal Pipe Connection


    Standard pressure controls shipped from the factory are set at the maximum operating range and minimum differential. For more information on standard pressure control settings and customer-specified pressure control settings, consult your local Rockwell Automation sales office or Allen-Bradley distributor.

    Click to enlarge - 836-15_10-1    Click to enlarge - 836-15_10-2
    Style C External Bellows —
    Type 4X Glass Reinforced Polyester Enclosure
       Style C External Bellows —
    Stainless Steel, Type 7 & 9 and 4 & 13 Combined

    Pressure Specifications Enclosure Type
    Adjustable Operating Range [in. Hg Vacuum…psi]‡  Adjustable Differential [psi] (Approximate Mid-Range Values) Maximum psi Open Type
    (Without
    Enclosure)
    Type 1 Type 4 & 13 Type 4X Type 7 & 9 and
    4 & 13∆ 
    Line Pressure Occasional Surge Pressure§  Cat. No. Cat. No. Cat. No. Cat. No. Cat. No.
    30 in. Vacuum…10 0.4…6♣  65 65 836-C60 836-C60A 836-C60J 836-C60S 836-C60E
    0.8…30 0.4…6 65 65 836-C61 836-C61A 836-C61J 836-C61S 836-C61E
    30 in. Vacuum…100 2…25♣  270 270 836-C62 836-C62A 836-C62J 836-C62S 836-C62E
    4…150 2.5…25 270 270 836-C63 836-C63A 836-C63J 836-C63S 836-C63E
    6…250 4…45 450 450 836-C64 836-C64A 836-C64J 836-C64S 836-C64E
    35…375 8…80 650 650 836-C65 836-C65A 836-C65J 836-C65S 836-C65E
      
    ⋆ Type 316 stainless steel bellows are available for more corrosive liquids or gases.
    ‡ For applications where settings approach 0 psi, select a control that has an adjustable range that goes into vacuum.
    § Transients (pulses) can occur in a system prior to reaching a steady-state condition. Surge pressures within published values generated during startup or shutdown of a machine or system, not exceeding eight times in a 24-hour period, are negligible.
    ♣ To determine differential in. Hg vacuum, multiply value in table by 2.036 (or approximately 2).
    ∆ The combined Type 7 & 9 and 4 & 13 Hazardous Gas and Dust service enclosure is supplied with special gasket and O-ring seal to diminish/exclude moisture, fluids, and dust from entering the enclosure. Enclosures rated 7 & 9 only are not designed to restrict moisture from entering the enclosure, which is common to outdoor service. Enclosure is rated for the following environments:
    CLASS I Groups C,D
    CLASS II Groups E,F,G
    CLASS III

    Ordering Modifications

    Modifications are ordered by adding the appropriate modification suffix code to the catalog number of the basic device. Add suffix codes to the catalog number in descending order (highest number first).

    Modifications

    Contact Blocks — Trip pressure-indicating scales are supplied on controls with standard contact block.

    Description Rating Symbol Suffix
    Code
    Automatic Operation
    Standard Contact Block — Single-pole, double-throw, snap-action. Supplied when a contact block suffix is not added to the catalog number. Control Circuit Rating:
    See Specifications
    on Standard Contacts
    Click to enlarge - 836-15_11-1
    Single-pole double-throw — slow-acting contact with no snap action. Contacts close on rise and close on fall with an open circuit between contact closures. Control Circuit Rating:
    AC-125VA, 24…250V
    Click to enlarge - 836-15_11-2 ⋆ ‡  X171
    Single-pole single-throw, normally open — closes on rise. 0.5 Hp, 115V AC
    1 HP, 230V AC
    Control Circuit Rating:
    AC-125 VA, 24…110V
    AC-345 VA, 110…600V
    DC-57.5 VA, 110…250V
    Click to enlarge - 836-15_11-3 ⋆ ‡  X221
    Single-pole single-throw, normally closed — opens on rise. Click to enlarge - 836-15_11-4 ⋆ ‡  X231
    Single-pole single-throw, normally open — closes on rise. 1 Hp, 115V AC
    1.5 Hp, 230V AC
    Control Circuit Rating:
    AC-600 VA, 110…600V
    DC-57.5 VA, 110…250V
    Click to enlarge - 836-15_11-3 ⋆ ‡  X321
    Single-pole single-throw, normally closed — opens on rise. Click to enlarge - 836-15_11-4 ⋆ ‡  X331
    External Manual Reset (Not available in Type 4X Enclosures)§ ♣ 
    Single-pole single-throw, normally open — contacts open at a predetermined setting on fall and remain open until system is restored to normal run conditions, at which time contacts can be manually reset. Non-inductive:
    5 A, 240V
    3 A, 600V
    Control Circuit Rating:
    AC-125 VA, 24…600V
    DC-57.5 VA, 115…230V
    Click to enlarge - 836-15_11-3 ⋆ § ♣ ∆  X140
    Single-pole single-throw, normally closed — contacts open on rise and remain open until system is restored to normal run conditions, at which time contacts can be manually reset. Click to enlarge - 836-15_11-4 ⋆ § ♣ ∆  X150
    Single-pole double-throw, one contact normally closed — contact opens on rise and remains open until system is restored to normal run conditions, at which time contact can be manually reset. A second contact closes when the first contact opens. Click to enlarge - 836-15_11-1 ⋆ § ♣ ∆  X15A
      
    ⋆ Contact blocks not available for field conversion or replacement.
    ‡ Minimum specified differential value approximately doubles.
    § Manual reset devices cannot be supplied with an adjustable differential. Inherent differential is approximately three times the differential of the corresponding adjustable differential control.
    ♣ Available only for replacement of complete open type control in an existing Type 1 or 4 & 13 enclosure. Replacement in a Type 7 & 9 enclosure is not available because it would void UL and CSA.
    ∆ Type 7 & 9 enclosures for manual reset devices are not also rated Type 4 & 13.

    Note: NEMA does not rate contacts to switch low voltage and current. Bulletin 836 Styles A and C Pressure Controls are supplied with silver contacts. The devices are designed to deliver high force snap action to the contacts. This provides exceptional contact fidelity at 24V DC I/O card current level entry when the control is protected in a suitable enclosure for the surrounding environment.

    Modifications are ordered by adding the appropriate modification suffix code to the catalog number of the basic device. Add suffix codes to the catalog number in descending order (highest number first).

    Modification Description Suffix Code
    Oxygen/Nitrous Oxide Service Bellows and fittings are specially prepared for oxygen and nitrous oxide service. The devices are tested with pure oxygen, bellows are plugged for protection from contamination, and a tag warning against contamination is applied. X2
    Tamper-Resistant Adjustment Range and differential adjustment screws are designed so that after a setting has been applied to the control, the adjustment screws can be broken off with a pliers. Note: The “break-off” adjustment screw(s) will not be broken off unless a factory setting is given and the order specifies “Break-off Adjustment Screw(s)”. See Ordering Factory-Set Pressure Controls. X4
    Neon Pilot Light, 120V AC A high intensity neon pilot light is available for 120V AC, 60 Hz applications and can be wired for ON or OFF operation. The current rating is 1.0 m A.⋆  X9
    Red LED Pilot Light, 24V DC A high intensity LED 24V DC pilot light is available to meet the requirements of the automotive, machine tool builders and other industries. The current rating is 22 mA and can be wired for ON or OFF operation.⋆  X15
    Green LED Pilot Light, 24V DC A high intensity LED 24V DC pilot light is available to meet the requirements of the automotive, machine tool builders and other industries. The current rating is 22 mA and can be wired for ON or OFF operation.⋆  X18
      
    ⋆ Not available on combined Type 7 & 9 and 4 & 13, Type 4X, and manual reset devices.

    Ordering Accessories

    Accessories are ordered as separate catalog numbers. Select the required accessories from the tables below.

    Accessories

    Pipe Adapter

    Description Cat. No.
    1/4 in. male pipe adapter with copper seating washer for Style A only. 836-N1
      

    Contact Block Replacement Kit

    Description Cat. No.
    Kit consists of a standard contact block and instructions. 836-N2
      

    Finger Safe Contact Block Cover

    Description Cat. No.
    Clear contact block cover provides IP2X Finger-Safe protection. 41162-908-01
      

    Hardware Kits for Mounting Open Type Controls in Special Enclosures

    Description Type Material Cat. No.
    Hardware kits for mounting open type controls in special enclosures allow ease of connecting pressure lines to the enclosure. For use with Type 1 and Type 4 & 13 enclosures with wall thickness up to 0.25 in. (6.35 mm). Style A Controls
    Open type controls Plated steel 836-N5
    Style C Controls
    Open type controls Brass 836-N8
    Stainless steel 836-N10
      

    Angle Mounting Brackets

    Description Bracket Type Cat. No.
    For mounting one or two open type Bulletin 836 Style A Pressure Controls or Bulletin 837 Temperature Controls on an enclosure mounting plate. Single bracket 836-N11
    Dual mounting bracket 836-N12
      

    Steam and/or Corrosive Media Applications — Isolation Traps

    Description Type Cat. No.
    An isolation trap is available for high-temperature media applications from 150…600 °F or corrosive applications compatible with Type 316 stainless steel tubing and fittings. The isolation coil is inserted between the bellows of the pressure control and the elevated temperature line of the system. The isolation trap will fill with condensed water or can be filled with water or suitable fluid when installed. A silicone buffer fluid is available in a convenient dispenser. Copper alloy lower and higher pressure range bellows can be applied to many applications using the isolation trap. The silicone buffer fluid is used to isolate many corrosive substances from coming in contact with the bellows. The isolation trap is rated at 3000 psi working pressure. Not available for piston-type controls. Isolation trap with two 1/4 in. male pipe fittings 836-N25
    Isolation trap with one 1/4 in. male and one 1/4 in. female pipe fitting 836-N26
    2 oz. of buffer fluid to fill bellows and tubing 836-N27
      

    Click to enlarge - 836-15_13-1
    Isolation Trap and Silicone Buffer Fluid


    Accessories are ordered as separate catalog numbers. Select the required accessories from the tables below.

    External Fixed Pulsation Snubbers

    Description Type Cat. No.
    Controls are supplied as standard with an internal pulsation snubber. However, a control properly selected and used within the adjustable range values yet having a short bellows life is a good indication of the presence of extreme surge pressures. External fixed pulsation snubbers are available to provide additional dampening when extreme pulsations or surges are present. Recommended if more than eight line surges occur in a 24 hr. time period. Snubber for Style A Controls 836-N6
    Snubber for Style C Controls 836-N7
      

    Selectable Element Pulsation Snubbers

    Description Type Cat. No.
    Controls are supplied as standard with an internal pulsation snubber. However, a control properly selected and used within the adjustable range values, yet having a short bellows life, is a good indication of the presence of extreme surge pressures. Selectable element pulsation snubbers are supplied with five different elements to provide a selectable balance between maximizing pressure control life and minimizing control response time. Pulsation snubbers are supplied with the mid-range element already mounted and four other color-coded porosity elements included in the package. Snubber for Style C Controls 836-N40
      

    Selectable Pulsation Snubber Porosity Elements

    Description Recommended Type of Service Color Code Porosity
    Elements are color-coded for easy identification. Elements are available in five different porosities for a wide range of applications. Viscous fluids (over 500 SSU)⋆  None Coarser
    Medium type oils (225…500 SSU)⋆  Black Click to enlarge - 836-14-1
    Water and light oils (30… 225 SSU)⋆  Brown
    Low viscosity fluids (under 30 SSU)⋆  Green
    Air and other gases Red Finer
    One of each of the above Assorted
      
    ⋆ SSU Saybolt Seconds Universal — units of viscosity measurement.
    Note:Color code is located on end of element.

    Pulsation Snubbers

    Click to enlarge - 836-15_14-1

    Factory Options

    Ordering Factory-Set Pressure Controls

    Standard Product Offering

    Standard pressure controls shipped from the factory are set at the maximum operating range and minimum differential. These settings vary for each pressure switch family depending on the combination of Style, Operator Type, and Pressure Specification configuration options. These pressure switches do not require a custom trip / reset setting characteristic. Customers still have the ability to set the operating range and differential in the field as long as they are within the limitation of switch.



    Custom Product Offering (Customer-Specified Settings)

    Pressure controls shipped from the factory can be set to customer-requested values as long as they are within the limitation of the switch. See Product Selection, and reference Adjustable Operating Range and Adjustable Differential values in the tables. These trip and reset ranges vary depending on the Style, Operator Type, and Pressure Specification configuration. These switches require a custom trip / reset setting characteristic. To request a pressure switch with customer specified trip and/or reset settings, order a pressure control catalog number ending with the “C” Custom Trip Reset Setting characteristic and include one of the following factory-set pressure control statements when the order is placed (within the Customer Review Request Notes field):



  • When a specific factory setting is requested, the specific terminal connections must be specified — e.g., N.O. or N.C. It must also be specified whether the contact operation is occurring on either increasing or decreasing pressure. For example:


  • Normally Closed (N.C.) contacts to open at⋆  psi increasing pressure and close at⋆  psi decreasing pressure.

    —OR—

    Normally Open (N.O.) contacts to close at⋆  psi increasing pressure and open at⋆  psi decreasing pressure.

  • If minimum differential is not critical and the inherent minimum differential satisfies the application, specify the factory setting as follows:


  • Normally Closed (N.C.) contacts to open at⋆  psi increasing pressure. Minimum differential.

    —OR—

    Normally Open (N.O.) contacts to close at⋆  psi increasing pressure. Minimum differential.


    ⋆ Specify psi (pounds per square inch) or, in. Hg vacuum (inches of mercury vacuum)
    ‡ Per ANSI B40.1 Grade 2A (0.5% accuracy full scale), Grade 3A (0.25% accuracy full scale).


    For further information on placing an order for a pressure switch with customer specified trip and reset settings, please contact the Global Product Support team or reference the Distributor Order Entry Process given on the Rockwell Automation website.

    If not specified, settings tolerances will be as shown in table below.

    Pressure Range Tolerance
    30 in. Hg Vac.…0 psi +/- 1 in. Hg Vac.
    > 0…100 psi +/- 1 psi
    > 100…300 psi +/- 2 psi
    > 300…500 psi +/- 5 psi
    > 500…1000 psi +/- 10 psi
    > 1000…5000 psi +/- 50 psi
     

    Quality analog “Test”‡  gauges are used when applying requested factory settings to these rugged industrial-grade pressure controls. (Gauges are calibrated and the accuracy is traceable to National Bureau of Standards.)

    The actual requested setting is applied to the control by reading the set point directly from the test gauge being used. However, traceable gauge tolerance variance between source and user, and possible severe shock during shipping and installation, may contribute to the factory settings deviating slightly from the specified values. Slight recalibration can easily be accomplished upon final installation to meet specific requirements for the more demanding applications. When installed, the controls will perform with a repeat accuracy as established in the paragraph on Repeat Accuracy and Mechanical Life entitled “Repeat Accuracy and Mechanical Life”.

    Special service is available to factory set controls on Digital Laboratory Instruments, up to 600 psi, when required for the more critical applications. An additional charge may be added for this service contingent upon setting tolerance and quantity.

    Consult your local Rockwell Automation sales office or Allen-Bradley distributor.


    Two Style A Controls In One Enclosure Bulletin 836 Style pressure controls which function independently may be mounted side by side in a single Type 1 enclosure. This design is ideal for installations where two controls would ordinarily be mounted. Each dual unit can be a combination of a Style A pressure control and a bulb and capillary type temperature control. See respective product tables.

    To order this arrangement, specify the two desired catalog numbers in their mounted position within the dual enclosure to form a single catalog number. The list price is the sum of the two Type 1 enclosed devices.

    For more information on special controls, please contact your local Rockwell Automation sales office or Allen-Bradley distributor.


    Refrigeration Controls

    Click to enlarge - 836-15_16-1


    Description

    Bulletin 836 Refrigeration Controls are similar to Bulletin 836 Style A Pressure Controls. However, refrigeration controls are constructed with additional pulsation dampening to filter out the severe pulsations generated by reciprocating refrigeration compressors. Pressure controls not supplied with the added snubber function may result in reduced bellows life. The reduced life results from pulsations severe enough to cause the bellows to "squeal" at the pump frequency or at the harmonic wave generated at specific pump loading demands. Refrigeration controls are supplied as standard with the pulsation snubber built into the stem of the bellows.

    Allen-Bradley heavy-duty refrigeration controls have copper alloy bellows for use with noncorrosive refrigerants. The devices can be supplied as single Open Type devices or mounted in a Type 1 enclosure. Standard controls have 7/16 in. – 20 SAE male threads for a 45° flare fuel and lubricant fitting. Optionally, the refrigeration controls can be supplied with capillary tubing. The capillary terminates with 1/4 in. tubing, which is flared and supplied with a 7/16 in. – 20 female nut. To modify the standard pressure connection, add suffix “-36” (denotes 36 in.) to the catalog number. There is no price addition for changing to a capillary-type pressure connection. Example: Cat. No. 836-H11-XHC, modified for a 36 in. capillary connection, is Cat. No. 836-H11-XHC-36.


    Style H — High Pressure Refrigeration Controls

    Click to enlarge - 836-15_16-2


    Style H


    Style L — Low Pressure Refrigeration Controls

    Click to enlarge - 836-15_16-4


    Style L


    Style P — High Pressure Definite-Purpose Refrigeration Controls

    Click to enlarge - 836-15_16-3


    Style P


    Click to enlarge - 836-15_16-2    Click to enlarge - 836-15_16-4    Click to enlarge - 836-15_16-3
    Style H High Pressure —
    Copper Alloy, Open Type With Capillary
    Adjustable Differential
       Style L Low Pressure —
    Copper Alloy, Open Type with capillary
    Adjustable Differential
       Style P High Pressure —
    Copper Alloy, Open Type
    Fixed Differential

    Style H High Pressure—Copper Alloy Bellows⋆ 

    Pressure Specifications Enclosure Type Contact Reference Number (See table below)
    Adjustable Operating Range [psi] Adjustable Differential [psi]
    (Approximate Mid-Range Values)
    Maximum Line Pressure [psi] Limited Maximum Stop [psi] Open Type Without Enclosure Type 1
    Cat. No. Cat. No.
    30…270 30…80 600 836-H11-XHCS 836-H11-XHC 1
    50…450 40…100 800 836-H11-BLCS 836-H11-BLC 1
    100…285 40…90 600 285 836-H33-XKKS 836-H33-XKK 3
    200…425 40…90 800 425 836-H33-BLKS 836-H33-BLK 3
    125…280 60…120 800 280 836-H33-BKKS 836-H33-BKK 3
    Customer Specified, Factory Locked Operating Range With Fixed Differential of 30 psi
    75…350 35 800 836-H33-XNAS 836-H33-XNA 3
      

    Style L Low Pressure—Copper Alloy Bellows⋆ 

    Pressure Specifications Enclosure Type Contact Reference Number (See table below)
    Adjustable Operating Range [in. Hg Vacuum…psi] Adjustable Differential [psi]
    (Approximate Mid-Range Values)
    Maximum Line Pressure [psi] Open Type (Without Enclosure) Type 1
    Cat. No. Cat. No.
    20 in. Hg Vacuum…120 psi 5…30‡  220 836-AL11-NKCS 836-AL11-NKC 1
    20 in. Hg Vacuum…120 psi 9…50‡  220 836-AL32-NKCHS 836-AL32-NKCH 2
      

    Style P High Pressure Definite Purpose—Copper Alloy Bellows⋆ 

    Pressure Specifications Enclosure Type Contact Reference Number (See table below)
    Adjustable Operating Range [psi] Fixed Differential [psi] Maximum Line Pressure [psi] Limited Maximum Stop [psi] Open Type (Without Enclosure) Type 1
    Cat. No. Cat. No.
    30…700 30 800 836-P11-ARBS 836-P11-ARB 1
      

    Contact Reference Number Table

    Reference Number Description Symbol Rating
    1 Single pole double throw — automatically opens or closes on
    rise or fall.
    Click to enlarge - 836-15_11-1 Non-inductive:
    5 A, 240V … 3 A, 600V
    Control Circuit Rating:
    AC-125VA, 24…600V
    DC-57.5VA, 115…230V
    2 Single pole single throw, normally open — closes on rise. Click to enlarge - 836-15_11-3 1 Hp, 115V AC
    1.5 Hp, 230V AC
    Control Circuit Rating:
    AC-600VA, 110…600V
    DC-57.5VA, 110…250V
    3 Single pole single throw, normally closed — opens on rise. Click to enlarge - 836-15_11-4
      
    ⋆ Copper alloy bellows may be used on water or air, and other liquids not corrosive to this alloy.
    ‡ To determine differential in in. Hg vacuum, multiply the value in the table by 2.036 (or approximately 2).

    Factory Options for Refrigeration Controls

    Two Controls In One Enclosure

    It is common in the industry to supply a low-pressure Style L and a high-pressure Style H mounted in a common, dual Type 1 enclosure. This factory option can be supplied with the low-pressure control on the left and the high-pressure control on the right. To order, combine the two desired Type 1 catalog numbers into a single number. Example: Low-pressure control 836-AL11-NKC-36, plus high-pressure control 836-H11-BLC-36, becomes an 836-AL11-NKC-36/836-H11-BLC-36.

    Click to enlarge - 836-15_18-1
    Two Style A Pressure Controls in One Type 1 Enclosure

    Approximate Dimensions and Shipping Weights

    Dimensions in inches (millimeters). Dimensions are not intended to be used for manufacturing purposes.

    Style A

    Click to enlarge - 836_a1_a2    Click to enlarge - 836-15_19-2
    Open Type
    Approximate Shipping Weight 1 lb. (0.45 kg)
       Type 7 & 9 and 4 & 13
    Approximate Shipping Weight 9 lbs (4.1 kg)
      
    Click to enlarge - 836-15_19-3    Click to enlarge - 836-15_19-4
    Type 1
    Approximate Shipping Weight 2 lbs (0.91 kg)
       Type 4 & 13
    Approximate Shipping Weight 3 lbs (1.4 kg)
      
    Click to enlarge - 836-15_19-5    Click to enlarge - 836-15_19-6
    Cat. No. 836-N1
    Approximate Shipping Weight 1/4 lb (0.1 kg)
       Cat. No. 836-N40
    Approximate Shipping Weight 1/4 lb (0.1 kg)

    Style C

    Click to enlarge - 836_c7
    Open TypeApproximate Shipping Weight 1.3 lbs. (.60 kg)⋆ 


    Cat. No. Dimension A
    C2, C3, C60, C61 6.11
    (155)
    C4 5.99
    (152)
    C5, C64 5.94
    (151)
    C6, C62 6.29
    (160)
    C7, C63 6.24
    (158)
    C8, C9 5.56
    (141)
    C10, C11, C12, C65 5.78
    (147)
      

    Click to enlarge - 836_dia22
    Type 1
    Approximate Shipping Weight 2.0 (.9 kg)
    Type 7&9 and 4&13
    Approximate Shipping Weight 10 lbs. (4.5 kg)
      
    Click to enlarge - 836-15_20-2    Click to enlarge - 836-15_20-3
    Type 4 & 13
    Approximate Shipping Weight 5 lbs (2.3 kg)
       Type 4X
    Approximate Shipping Weight 6 lbs (2.7 kg)

    ⋆ Cat. No.s 836-C1 and 836-C1A:
    Require a 2 in. swing radius from centerline of pressure connection. Mount control on 7/8 in. minimum spacers
    Have a 3/8-18 N.P.S.F. internal pipe connection