Pressure, Mechanical

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Bulletin 836 Pressure Controls, General Industrial

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.