Bulletin 836 Pressure Controls, General Industrial

Product Overview

Bulletin 836 Pressure Controls

• Operating ranges from 30 in. Hg vacuum…900 psi
  
• Independently adjustable range and differential
  
• Copper alloy and stainless steel bellows
  
• 7/16-20 S.A.E. and 1/4 in. N.P.T.F. connections
  
• Variety of contact blocks available
  
• Open Type, Type 1, Type 4&13, Type 4X and Type 7&9 and 4&13 combination enclosures
  

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

• Air compressors
  
• Compressed air monitor systems
  
• Liquid level control
  
• Vacuum transfer systems
  
• High pressure alert
  
• Low pressure alert
  
• Monitor low and high Pressure
  

Style A — Small Size, Internal Copper Alloy Bellows



Style A

• Independently adjustable range and differential
  
• 7/16-20 SAE flare for 1/4 in. copper tubing connection
  
• Adjustable operating range — 30 in. Hg vacuum…375 psi
  
• Maximum line pressure — up to 750 psi
  
• Occasional surge pressure — up to 850 psi
  

Style C — Wider Ranges, External Bellows



Style C

• Independently adjustable range and differential
  
• 1/4 in N.P.T.F. internal pipe connection
  
• 3/8 in N.P.S.F. internal pipe connection (836-C1 and 836-C1A only)
  

Copper Alloy Bellows

• Adjustable operating range — 30 in. Hg vacuum…900 psi
  
• Maximum line pressure — up to 1300 psi
  
• Occasional surge pressure — up to 1600 psi
  

Type 316 Stainless Steel Bellows

• Adjustable operating range — 30 in. Hg vacuum…375 psi
  
• Maximum line pressure — up to 650 psi
  
• Occasional surge pressure — up to 650 psi
  

Refrigeration Controls - See Refrigeration Controls



Style H

• High-pressure refrigeration controls
  

Style L

• Low-pressure refrigeration controls
  

Style P

• High-pressure definite purpose controls
  

Standards Compliance

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

Certifications

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



Figure 2
Positive pressure or vacuum



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



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



Figure 5
Typical monitoring application



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



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



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



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 controls to customer-specified values. Unspecified pressure controls shipped from the factory 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

When ordering Bulletin 836 Pressure Controls, consider the following:
• Device style
  
• Occasional surge pressure
  
• Adjustable operating range
  
• Pressure media
  
• Adjustable differential
  
• Enclosure type
  
• Maximum line pressure
  
• Pressure connection
  

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
		a		b		c		d

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).

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

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.

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.

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.

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.

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		—
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		⋆ ‡	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		⋆ ‡	X221
Single-pole single-throw, normally closed — opens on rise.			⋆ ‡	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		⋆ ‡	X321
Single-pole single-throw, normally closed — opens on rise.			⋆ ‡	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		⋆ § ♣ ∆	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.			⋆ § ♣ ∆	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.			⋆ § ♣ ∆	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

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
	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


Factory Options

Ordering Factory-Set Pressure Controls

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).

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



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



Style H

• Copper alloy bellows with built-in pulsation snubber
  
• 7/16 in. — 20 SAE male thread for 45° flare fitting
  
• Adjustable operating range — 30…120 psi
  
• Maximum line pressure — 450 psi
  
• Occasional surge pressure — 800 psi
  
• With capillary and flare connection
  

Style L — Low Pressure Refrigeration Controls



Style L

• Copper alloy bellows with built-in pulsation snubber
  
• With capillary and tubing connection
  
• Adjustable operating range — 20 in. Hg vacuum…120 psi
  
• Maximum line pressure — 220 psi
  

Style P — High Pressure Definite-Purpose Refrigeration Controls



Style P

• Copper alloy bellows with built-in pulsation snubber
  
• 7/16 in. — 20 SAE male thread for 45° flare fitting
  
• Operating range — 30…700 psi
  
• Line and occasional surge pressure — 800 psi
  
• Fixed differential — 30 psi
  

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.		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.		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.
⋆ 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.

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

Open Type Approximate Shipping Weight 1 lb. (0.45 kg)		Type 7 & 9 and 4 & 13 Approximate Shipping Weight 9 lbs (4.1 kg)
Type 1 Approximate Shipping Weight 2 lbs (0.91 kg)		Type 4 & 13 Approximate Shipping Weight 3 lbs (1.4 kg)
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

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)

Type 1 Approximate Shipping Weight 2.0 (.9 kg) Type 7&9 and 4&13 Approximate Shipping Weight 10 lbs. (4.5 kg)
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