PURGEABLE ENCLOSURE INSTRUMENT ACCESS DOORS Model Number Matrix

Model Number Matrix

The Model Number Segments below specify standard features and options for our Purgeable Instrument Access Doors. Please note limitations to various selections apply as indicated by an asterisk and note number in red text.

Click question symbols below for more information on any particular item.

Typical Model Number:

Model Number

PIAD

A

XG

1

XT

L

4X

Segments1234567

Model Number

PIAD

A

Segments12

XG

1

XT

345

L

4X

67
1 – Product Series 
PIADPurgeable Instrument Access Doors
2 – Window Size Range 
A000 to 144 square inches
B145 to 288 square inches
C289 to 432 square inches
D433 to 576 square inches
E577 to 2304 square inches
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Window Size equates to the viewing area of your Purgeable Instrument Access Door, which is based upon your device bezel or total area you wish to cover.   To determine your Window Size, measure the height and width of the device bezel or total square area you wish to protect and add one (1) inch to the overall height and width.   You may then multiple those two numbers to determine the square inches you require and select the appropriate PIAD Window Size range.

FREE SPACE FOR PIAD MOUNTING:
We recommend adding ten inches (10″) to your device bezel  height and width to determine how much free space will be required to ensure you have adequate clearance on all sides of your device or protected area to mount the Purgeable Instrument Access Door.   If you have any questions, please see our Sizing Guides & Specifications Page for more information or contact a Best Purging Systems Corporation Sales Associate for assistance!

INTERIOR CLEARANCE OR DEPTH
As another critical element of proper sizing, please note the standard depth of Best Purging Systems Instrument Access Doors, as measured from the surface of your protected enclosure to the rear side of the window is two inches (2″).   This is adequate for most panel mounted devices, but if you need additional depth, please contact us to express your special interior clearance requirement!

3 – 1st Digit: Mounting Frame & Door Material
C14 Gauge Carbon Steel   *1
A3/32* 5052 Aluminum  *1
S14 Gauge 304 Grade Stainless Steel
X14 Gauge 316 Grade Stainless Steel
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As one of the most significant advantages of purchasing a Purgeable Instrument Access Door from Best Purging Systems Corporation, we offer a wide variety of materials to best match the material and finish of your protected enclosure!   Consider the material of your protected enclosure when making this Segment selection, and note the only limitations are selection of carbon steel or aluminum materials in combination with a NEMA 4X rating in Segment 7.   By requesting matching materials, you ensure that the corrosion resistance integrity of the protected enclosure is equalled in all respects by the Purgeable Instrument Access Door.

3- 2nd Digit: Window Material 
G1/4″ Laminated Safety Glass  *2
L1/4″ Lexan™ Margard™ MR-10
W1/4″ Wire Reinforced Safety Glass  *2 & *3
CCustom Material   *4
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When choosing your window material please consider the following factors in relation to the requirements for your particular application:   Lexan™ Margard™ MR-10 has the highest degree of impact resistance, at a ratio of nearly 10:1 when compared to laminated or wire reinforced safety glass across a broad spectrum of various conditions.   Laminated safety glass has the maximum degree of transparency and resistance to UV rays, and along with wire reinforced safety glass is extremely scratch resistant.

However, Laminated and Wire Reinforced Safety Glass are not available in our two largest Window Size Ranges, due to a tendency to crack when flexed or twisted along the axis of any unhinged side.   Temperature resistance of all three materials is similar, but Lexan™ Margard™ MR-10 is far less likely to crack upon impact at extreme temperatures, and does not shatter upon impact like laminated or wire reinforced safety glass.   For more information about each window material and assistance in selecting the right material for your application, please contact a Sales Associate.

4 – Mounting Frame & Door Finish
1Black Epoxy Powder Coated
2Black Anodized (Aluminum only)
3Horizontal Brush (Stainless Steel only)
4Vertical Brush (Stainless Steel only
5Custom Finish  *4
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As one of the most significant advantages of purchasing a Purgeable Instrument Access Door from Best Purging Systems Corporation, we offer a variety of finishes to complement your protected enclosure!   But when details matter, we can offer virtually any finish you desire, including custom paint colors, along with anodized, nickel plated, powder coated, or passivated finishes!  Simply select Custom Finish for this segment of your PIAD Model Number, and supply your special requirements to us in writting to get the process started.

5 – 1st Digit: Latch Finish & Material
ABlack Polyester Powder Coated Die Cast Zinc  *5
XElectro-Polished 316 Grade Stainless Steel
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Best Purging Systems provides hand, tool or key operated vice-action compression latches with two material options to meet your particular needs for durability and corrosion resistance.   The black powder coated die cast zinc latch is best suited for our painted carbon steel and aluminum mounting frame and door material option.   It is our most popular latch, economical and salt spray tested, but may not survive extremely corrosive environments.   The electro-polished 316 stainless steel latches are best suited for 304 or 316 grade stainless steel mounting frame and door material options, and offer the highest level of durability against extremely corrosive environments.   However, you are encouraged to select the latch material of your choice, and due to their outstanding durability, no restriction is placed on their selection, with exception only to the use of black powder coated die cast zinc compression latches with the NEMA 4X Rating below!

5 - 2nd Digit: Operator Style 
HHand Operated Compression Latch
KKey Operated Compression Latch  *6
TTool Operated Compression Latch  *7
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Best Purging Systems provides hand, tool or key operated vice-action compression latches to secure your Purgeable Instrument Access Door, which are all acceptable for Type Y & Z purging and pressurization applications.   In regard to the use of Hand Operated Latches for Type X applications, it is important to determine if an exception to NFPA 496 Section 5.5.2 is permissible by your Safety Management Team or Authority Having Jurisdiction or critical to proper operation of the devices protected by the Purgeable Instrument Access Door.   Otherwise, in accordance with this NFPA 496 requirement, all devices within the protected enclosure that are not suitable for the Hazardous (classified) Area in the absence of Type X pressurization must be de-energized prior to opening the Purgeable Instrument Access Door.   However, if you select Key or Tool Operated Latches, they are totally compliant with this important NFPA 496 requirement!

6 – Hinge Position 
LLeft Side
RRight Side
TTop Side
BBottom Side
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There are several factors to consider when selecting your hinge position. First, the hinge side of a PIAD requires additional clearance to permit the door to open fully.   In addition, Best Purging Systems limits the ratio of unhinged to hinged sides to a maximum of 3:1 under most circumstances, to prevent door sagging and undue stress on the door hinges.   Elevation and orientation of your devices or obstructions to PIAD door hinging such as adjacent obstacles to protected device access or proper door operation also factor into selecting a hinge position, and if a top or bottom hinge location is selected, or if the protected enclosure will be subjected to high winds, the addition of Hydraulic Lifts or Positioners may be warranted.   If you have any questions, please feel free to contact a Best Purging Systems Corporation Sales Associate for assistance!

7 – PIAD NEMA Rating 
12NEMA 12
4NEMA 4
4XNEMA 4X  *8
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Best Purging Systems offers NEMA 12, 4 and 4X ratings to meet the specific parameters of your particular application.   A NEMA 12 rating provides protection against dust and non-corrosive dripping liquids, and is intended for indoor applications that will not be subjected to wash-down.   A NEMA 4 rating provides protection against extreme rain and washdown, and is intended for outdoor applications.   When addressing severely corrosive outdoor environments, we recommend 316 Stainless Steel Material and the NEMA 4X rating, but regardless of the NEMA rating you select, the options of 304 or 316 Stainless Steel material are recommended if the surrounding atmosphere contains any level of corrosive gases, dusts or vapors whether your PIAD is located in an indoor or outdoor location.

Selecting the correct NEMA rating is an extremely critical decision that will greatly impact the overall performance and life span of your Purgeable Instrument Access Door.   Please therefore review our NEMA Ratings information on our Optional Features page for more information and contact a Best Purging Systems Sales Associate or Technical Advisor if you have any questions or concerns regarding the selection of an appropriate NEMA rating.

 * MODEL NUMBER SELECTION NOTES:

  1. Carbon Steel and Aluminum Material may not be selected in combination with a NEMA 4X Rating in Segment 7.
  2. Laminated and Wire Reinforced Safety Glass are only available in Window Size Ranges A-C.
  3. Wire Reinforced Safety Glass should only be selected when impact hazards are immanent, due to viewing obstructions created by wire.
  4. Please provide custom window material and case finish specifications in writing at time of order.
  5. Die Cast Zinc Compression Latch Material may not be selected in combination with a NEMA 4X Rating in Segment 7.
  6. Key Operated Compression Latch Operators require a special key to operate. One (1) key is supplied with each unit, but extra keys are available on request.
  7. Tool Operated Compression Latch Operator requires a 5/32″ hex (allen) head tool to operate (not supplied).
  8. Selection of NEMA 4X requires selection of 304 or 316 Grade Stainless Steel Material in Segment 3 and selection of Electro-Polished 316 Grade Stainless Steel Latch Material in Segment 5.

Please consult a Best Purging Systems Corporation Sales Associate for more information and PIAD customization.