Technical Data Sheet: MX8462-MRI (K5.6) and MX8464-MRI (K8.0) Quick Response Concealed
Pendent Sprinklers
1. DESCRIPTION
Quick Response Concealed MRI Sprinklers are intended for use inside an MRI
environment, such as the MR system room. They are not intended to be used within
the bore of the MR scanner itself. This sprinkler has been independently tested
for use with a 3-Tesla MR system in accordance with ASTM F2502-15 criteria.
The results of this test demonstrate that this product is acceptable for use in an
environment with a static magnetic field of 3-Tesla or less and the highest spatial
gradient magnetic field of 330-Gauss/cm or less.
The sprinkler is pre-assembled with a threaded adapter for installation with a lowprofile cover assembly that provides up to ½” (13 mm) of vertical adjustment. The
two-piece design allows installation and testing of the sprinkler prior to installation
of the cover plate. The “push-on”, “thread-off” design of the concealed cover plate
assembly allows easy installation of the cover plate after the system has been tested
and the ceiling finish has been applied. The cover assembly can be removed and
reinstalled, allowing temporary removal of ceiling panels without taking the sprinkler
system out of service or removing the sprinkler.
2. LISTINGS AND APPROVALS
cULus Listed: Category VNIV
* Refer the Approval Chart and Design Criteria for cULus Listing requirements that must be
followed.
3. TECHNICAL DATA
Specifications:
Minimum Operating Pressure: 7 psi (0.5 bar)
Maximum Working Pressure: 175 psi (12 bar) wwp
Factory tested hydrostatically to 500 psi (34.5 bar)
Thread size: 1/2” (15 mm) NPT or 3/4” (20 mm) NPT
Nominal K-Factor: 5.6 U.S. (80.6 metric**) or 8.0 U.S. (115.2 metric*)
Glass-bulb fluid temperature rated to -65 °F (-55 °C)
Overall Length: 2-1/4” (58 mm)
** Metric K-factor measurement shown is when pressure is measured in Bar. When pressure is measured in kPa, divide the metric K-factor shown by 10.0.
Material Standards - Sprinkler:
Sprinkler Body: Brass UNS-C84400
Deflector: Phosphor Bronze UNS-C51000
Deflector Pins: Stainless Steel Alloy
Bulb: Glass, nominal 3 mm diameter
Pip Cap and Insert Assembly: Copper UNS-C11000 and Stainless Steel UNS-S30400
Button: Brass UNS-C36000
Screws: 18-8 Stainless Steel
Belleville Spring Sealing Assembly: Nickel Alloy, coated on both sides with Teflon Tape
Yoke: Phosphor Bronze UNS-C51000
Cover Adapter: Brass UNS-C26800
Material Standards - Cover
Cover: Copper UNS-C11000
Base: Brass UNS-C26800 or UNS-C26000
Springs: Nickel Alloy
Solder: Eutectic
Available Temperature Ratings:
Temperature 155 °F (68 °C) 175 °F (79 °C) 200 °F (93 °C)
Suffix B D E
Ordering Information: Sprinkler Assembly and Cover Plate must be ordered separately. Refer to Tables 1 and 2.
4. INSTALLATION
Refer to appropriate NFPA Installation Standards.
5. OPERATION
During fire conditions, the heat-sensitive liquid in the glass bulb expands, causing the glass to shatter, releasing the pip cap and
sealing spring assembly. Water flowing through the sprinkler orifice strikes the sprinkler deflector, forming a uniform spray pattern
Form No. FX_062098 18.12.04 Rev 18.1
to extinguish or control the fire.
®
© 2018 | Minimax Fire Protection | 321 Industrial Park Dr. | Hastings, MI 49058 | www.minimax-re.com
Page 1/4
6. INSPECTIONS, TESTS, AND MAINTENANCE
Refer to NFPA 25 for Inspection, Testing and Maintenance requirements.
7. AVAILABILITY
The Model MX8462-MRI and MX8464-MRI Sprinklers are available through a network of domestic and international distributors.
See the web site for the closest distributor or contact us.
8. GUARANTEE
For details of warranty, refer to the current list price schedule or contact us directly.
TABLE 1: SPRINKLER ORDERING INFORMATION
Instructions: Using the sprinkler base part number,
(1) add the suffix for the desired Temperature Rating.
The cover plate must be ordered separately - see Table 2.
Size
NPT
Inch
Temperature
Classification
Nominal Rating Bulb Color
SIN
Sprinkler
Base Part
No.
MX8462 61286A 1/2 Ordinary 155 °F (68 °C) Red 100 °F (38 °C) B
MX8464 61288A 3/4
Intermediate 175 °F (79 °C) Yellow 150 °F (65 °C) D
Intermediate 200 °F (93 °C) Green 150 °F (65 °C) E
Example: 61286AE =
MX8462-MRI, 200 °F (93 °C) Temperature Rated Sprinkler.
Accessories
1: Temperature Ratings
Max. Ambient Ceiling
Temperature
2
Suffix
Sprinkler Wrenches (see Figure 1):
A. Heavy Duty Wrench Part Number: 14047WB
3
B. Head Cabinet Wrench Part Number: 14031
Sprinkler Cabinet:
Part number 61414.
Footnotes
1.
Where a dash (-) is shown in the Finish suffix designation, insert the desired Temperature Rating suffix. See example above.
2.
Based on NFPA 13, NFPA 13R, and NFPA 13D. Other limits may apply, depending on fire loading, sprinkler location, and other requirements of the Authority Having
Jurisdiction. Refer to specific installation standards.
3.
Requires a 1/2” ratchet which is not available from us.
TABLE 2: COVER PLATE ORDERING INFORMATION
Instructions: Using the cover plate base part number,
(1) add the suffix for the desired Finish
(2) add the suffix for the required Cover Plate Nominal Rating.
Cover Plate
Base Part
Number
4
Size
Inch (mm)
Style
1: Finishes Temperature Rating Matrix
Description Suffix
Cover Plate
5
Nominal Rating
(Required)
Sprinkler
Nominal Rating
Ambient Ceiling
61365 2-3/4 (70) Round Polished Chrome F 135 °F (57 °C) 155 °F (68 °C) 100 °F (38 °C) A
61366 3-5/16 (84) Round Painted White M-W 165 °F (74 °C) 175 °F (79 °C) 150 °F (65 °C) C
Painted Ivory M-I 165 °F (74 °C) 200 °F (93 °C) 150 °F (65 °C) C
Painted Black M-B
Example: 61365FC = 165 °F (74 °C) Temperature Rated
2-3/4” (70 mm) Diameter Round Cover Plate
with a Polished Chrome Finish.
Footnotes
1.
The sprinkler temperature rating is stamped on the deflector.
2.
Based on NFPA-13, NFPA 13R, and NFPA 13D. Other limits may apply, depending on fire loading, sprinkler location, and other requirements of the Authority Having
Jurisdiction. Refer to specific installation standards.
3.
Maximum ambient temperature for cover assembly is 150 °F (65 °C).
4.
Part number shown is the base part number. For complete part number, refer to current our price list schedule.
5.
Where a dash (-) is shown in the Finish suffix designation, insert the desired Temperature Rating suffix. See example above.
Form No. FX_062098 18.12.04 Rev 18.1
1,2
Sprinkler Max.
Temperature
2,3
Suffix
© 2018 | Minimax Fire Protection | 321 Industrial Park Dr. | Hastings, MI 49058 | www.minimax-re.com
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Approval Chart
Quick Response Concealed Pendent MRI Sprinklers
Sprinkler
Base Part
Number
1
SIN
Thread Size
NPT Inch U.S. metric
Nominal
K-Factor
Maximum Water
Working Pressure
2
61286A MX8462 1/2 5.6 80.6 175 psi (12 bar) AW1, BX1
61288A MX8464 3/4 8.0 115.2 175 psi (12 bar) AW1, BX1
Sprinkler Temperature Ratings
A - 155°F (68°C)
B - 175°F (79°C) and 200°F (93°C)
Cover Plate Assembly Temperature Ratings
W - 135°F (57°C) cover 613651 or 613661 (large diameter)
X - 165°F (74°C) cover 613651 or 613661 (large diameter)
5
Listings and Approvals
(Refer also to Design Criteria)
Cover Plate Assembly Finishes
1 - Polished Chrome, Brushed Chrome, Bright
Brass, Antique Brass, Brushed Brass,
Brushed Copper, Painted White, Painted
Ivory, or Painted Black
cULus
3
4
6
1
Part number shown is the base part number. For complete part number, refer to current price list schedule.
2
Metric K-factor measurement shown is when pressure is measured in Bar. When pressure is measured in kPa, divide the metric K-factor shown by 10.0.
3
This chart shows the listings and approvals available at the time of printing. Other approvals may be in process. Check with the manufacturer for any
additional approvals.
Footnotes
4
Listed by Underwriter’s Laboratories for use in the U.S. and Canada.
5
The 135°F cover has an orange label. The 165°F cover has a white label.
6
Painted finish consists of Polyester Baked Enamel. Other paint colors are available on request with the same listings as the standard paint colors.
Listings and approvals apply for any paint manufacturer. Contact Minimax Fire Protection for additional information.
NOTE: Custom colors are indicated on a label inside the cover assembly. Refer to Figure 1.
Design Criteria
(Also refer to the Approval Chart.)
cULus Listing Requirements:
Concealed Pendent MRI Sprinklers were subjected to magnetic field interaction testing and determined to be MRI conditional according to the terminology specified in ASTM International, Designation F2502-15. These sprinklers are intended for use in a high magnetic field environment according
to the following conditions:
1. Static magnetic field of 3-Tesla or less
2. Highest spatial gradient magnetic field of 330-Gauss/cm or less
Sprinklers MX8462 and MX8464 are cULus Listed for installation in accordance with the latest edition of NFPA 13 for standard coverage pendent spray
sprinklers as indicated below.
• For hazard occupancies up to and including Ordinary Hazard, Group II.
• Protection areas and maximum spacing shall be in accordance with the tables provided in NFPA 13. Maximum spacing allowed is 15 ft. (4.6 m).
• Minimum spacing allowed is 6 ft. (1.8 m) unless baffles are installed in accordance with NFPA 13.
• Minimum distance from walls is 4 in. (102 mm).
• Maximum distance from walls shall be no more than one-half of the allowable distance between sprinklers. The distance shall be measured
perpendicular to the wall.
• The sprinkler obstruction rules contained in NFPA 13 for standard coverage pendent spray sprinklers must be followed.
NOTE: Concealed sprinklers must be installed in neutral or negative pressure plenums only.
IMPORTANT: Always refer to Form No. FX_091699 - Care and Handling of Sprinklers. Also refer to Form No. FX_080614 for
general care, installation, and maintenance information. Minimax Fire Protection sprinklers are to be installed in accordance
with the latest edition of Minimax Fire Protection technical data, the appropriate standards of NFPA or other similar organizations, and also with the provisions of governmental codes, ordinances, and standards, whenever applicable.
All custom color painted cover plates will have
an identifying label affixed to the inside of the
cover that indicates the custom color and will
have a representative sample (a paint dot) of
the paint on the label.
Form No. FX_062098 18.12.04 Rev 18.1
© 2018 | Minimax Fire Protection | 321 Industrial Park Dr. | Hastings, MI 49058 | www.minimax-re.com
Figure 1: Identification of Custom Paint for Concealed Covers
Page 3/4
Sprinkler and Adapter Assembly
• Protective cap removed
• Use wrench 14031**
2-1/4” (57 mm)
diameter opening
required in the
ceiling.
Sprinkler Wrench
Part No. 14047WB**
Step 1:
Carefully slide the
wrench sideways around
the deector and pins
• NEVER install the sprinkler by applying the
installation wrench across the frame arms.
• DO NOT overtighten.
• Use only the designated sprinkler wrenches,
Minimax Fire Protection Part Numbers 14047WB or
14031**.
• A leak tight seal should be achieved by turning the
sprinkler clockwise 1 to 1-1/2 turns beyond nger
tight.
Figure 2: Sprinkler Installation and Proper Wrench Usage (Sprinkler MX8462 Shown)
A 1/2” ratchet is required (Not available from us.)
**
1/2” (15mm) NPT (MX8462)
or
3/4” (20mm) NPT (MX8464)
2-1/8” (54 mm)
Minimum
Step 2:
Carefully press the wrench upward and
turn slightly to ensure engagement with
the sprinkler wrench ats.
Sprinkler
wrench at
Sprinkler
frame arms
2-5/8” (67 mm)
Maximum
2-3/16”
(56 mm)
NOTE: Upon sprinkler activation, the deector descends
to approximately 13/16” (21 mm) below the sprinkler body.
Form No. FX_062098 18.12.04 Rev 18.1
© 2018 | Minimax Fire Protection | 321 Industrial Park Dr. | Hastings, MI 49058 | www.minimax-re.com
Figure 3: Sprinkler Dimensions and Cover Installation (Sprinkler MX8462 Shown)
2-3/4” (70 mm) or
3-5/16” (84 mm)
Page 4/4
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