Unit INSTALLATION

Best Purging Systems Corporation Pressurization Units feature 3 compression fittings to speed and simplify Unit installation procedures.

We identify the connections to our Pressurization Units as the enclosure pressure reference connection, the unit supply connection and the enclosure supply connection, as fully described below.

Installation Technicians therefore only require a protective gas source in the immediate vicinity of your protected enclosure and instrument grade tubing along with fittings we offer for your protected enclosure.

For more information, please review our
Installation and Operation Manuals below.

Rely on Best Purging Systems Corporation to provide sensibly designed products that include compression fittings for all unit connections
to simplify the installation process!

Enclosure Pressure Reference Connection

This connection point is a 1/4″ compression tube fitting, and must be connected directly to the protected enclosure with no valves, restrictions or other devices between the unit and protected enclosure.  It originates from the high side of the enclosure pressure gauge and pressure switch if included, and measures pressure within the enclosure as compared to the surrounding atmosphere.

When a Universal Configuration Unit is panel mounted, this connection will not be necessary, but the low side of the enclosure pressure gauge will need to be connected by tubing to a bulkhead fitting that penetrates the protected enclosure to reference the surrounding atmospheric pressure.

For more information about Universal Unit panel mounting, please contact a Sales Associate, click the Product Accessories Link above, or visit our PDF Library to review our highly detailed Panel Mount Gasket Kit Technical Bulletin.

Unit Supply Connection

This connection point is a 1/4″, 3/8″ or 1/2″ compression tube fitting for Model 101A, 101B and 101C Pressurization Units, respectively.  It must be connected directly to a source of clean, dry instrument air or inert gas containing no more than trace amounts of any flammable gases or vapors, with no valves, restrictions or other devices between the unit and the protective gas supply.  Pressure must be limited to a maximum of 125 PSI, and the minimum required flow rate will depend upon the unit size selected.

Regardless of the Area Classification or Unit selected, Best Purging Systems strongly recommends the use of a redundant regulator to limit the protective gas supply pressure or a purge vent to protect against excessive supply pressure and other sources of pressure within the protected enclosures.

For more information about the required flow rate, please contact a Sales Associate, click the Specifications and Certifications Link above, or visit our PDF Library to review our highly detailed Pressurization Unit Technical Bulletins.

For more information about our redundant regulators and purge vents, please contact a Sales Associate, click the Product Accessories Link above, or visit our PDF Library to review our highly detailed Redundant Regulator and Purge Vent Technical Bulletins.

Enclosure Supply Connection

This connection point is a 1/4″, 3/8″ or 1/2″ compression tube fitting for Model 101A, 101B and 101C Pressurization Units, respectively. It must be connected directly to the protected enclosure with no valves, restrictions or other devices between the unit and the protected enclosure.

When Model 101A is utilized for a Class I application, it is critical to consider the specific gravity of the potential flammable gases or vapors that may be contained within the protected enclosure. If the gas or vapor is lighter than air and will rise in the enclosure, this connection should enter near a bottom corner of the protected enclosure, and the required purge vent should be located near the opposite top corner to most easily remove any potential flammable gases or vapors. For gas or vapors heavier than air, the opposite technique should be exercised.

In Class II Areas, the location of the enclosure supply connection is not critical, but removal of all combustible dust prior to start-up is essential.

Universal Unit Connection Points