1、Comments, suggestions, or questions on this document should be addressed to: Commander, Naval Sea Systems Command, ATTN: SEA 05Q, 1333 Isaac Hull Avenue, SE, Stop 5160, Washington Navy Yard DC 20376-5160 or emailed to CommandStandardsnavy.mil, with the subject line “Document Comment”. Since contact
2、information can change, you may want to verify the currency of this address information using the ASSIST Online database at http:/assist.daps.dla.mil. AMSC N/A FSC 6320 INCH-POUND MIL-PRF-32224 25 October 2006 PERFORMANCE SPECIFICATION SMOKE SENSORS, IONIZATION AND PHOTOELECTRIC, ADVANCED FIRE AND S
3、MOKE SENSOR SYSTEM (AFSSS) This specification is approved for use by all Departments and Agencies of the Department of Defense. 1. SCOPE 1.1 Scope. This specification covers the performance requirements for both ionization and photoelectric smoke sensors (see 6.8.10 and 6.8.12, respectively) and the
4、ir universal bases and junction boxes, which are components of an overall Advanced Fire and Smoke Sensor System (AFSSS) for use on naval ships. These ionization and photoelectric smoke sensors, universal bases, and junction boxes may be of commercial-off-the-shelf (COTS) design, but must be rugged (
5、see 6.8.15) enough to meet all of the requirements of this performance specification and the rigors of Navy shipboard service. Performance requirements for the other associated AFSSS components (e.g., heat sensors (see 6.8.9), flame detectors (see 6.8.7), Flame Detector Zone Modules (FDZM) (see 6.8.
6、8), Switch Closure Zone Modules (SCZM) (see 6.8.20), isolators (see 6.8.11), and alarm panel (see 6.8.2) are contained in their respective AFSSS specifications. 2. APPLICABLE DOCUMENTS 2.1 General. The documents listed in this section are specified in sections 3, 4, or 5 of this specification. This
7、section does not include documents cited in other sections of this specification or recommended for additional information or as examples. While every effort has been made to ensure the completeness of this list, document users are cautioned that they must meet all specified requirements of document
8、s cited in sections 3, 4, or 5 of this specification, whether or not they are listed. 2.2 Government documents. 2.2.1 Specifications, standards, and handbooks. The following specifications, standards, and handbooks form a part of this document to the extent specified herein. Unless otherwise specifi
9、ed, the issues of these documents are those cited in the solicitation or contract. DEPARTMENT OF DEFENSE SPECIFICATIONS MIL-S-901 - Shock Tests, H.I. (High Impact); Shipboard Machinery, Equipment and Systems, Requirements for MIL-E-2036 - Enclosures for Electric and Electronic Equipment, Naval Shipb
10、oard MIL-DTL-24643 - Cables and Cords, Electric, Low Smoke, for Shipboard Use, General Specifications for Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-PRF-32224 DEPARTMENT OF DEFENSE STANDARDS MIL-STD-167-1 - Mechanical Vibrations of Shipboard
11、 Equipment (Type I - Environmental and Type II - Internally Excited) MIL-STD-461 - Requirements for the Control of Electromagnetic Interference Characteristics of Subsystems and Equipment (Copies of these documents are available online at http:/assist.daps.dla.mil/quicksearch/ or http:/assist.daps.d
12、la.mil or from the Standardization Document Order Desk, 700 Robbins Avenue, Building 4D, Philadelphia, PA 19111-5094.) 2.3 Non-Government publications. The following documents form a part of this document to the extent specified herein. Unless otherwise specified, the issues of these documents are t
13、hose cited in the solicitation or contract. NATIONAL FIRE PROTECTION ASSOCIATION (NFPA) NFPA 72 - National Fire Alarm Code (Copies of this document are available from National Fire Protection Association, One Batterymarch Park, Quincy, MA 02269 or online at http:/www.nfpa.org/.) UNDERWRITERS LABORAT
14、ORIES INC. (UL) UL 268 - Smoke Detectors for Fire Protective Signaling Systems (Copies of this document are available from Underwriters Laboratories, Inc., 333 Pfingsten Road, Northbrook, IL 60062-2096 or online at .) 2.4 Order of precedence. In the event of a conflict between the text of this docum
15、ent and the references cited herein, the text of this document takes precedence. Nothing in this document, however, supersedes applicable laws and regulations unless a specific exemption has been obtained. 3. REQUIREMENTS 3.1 First article. When specified (see 6.2 and 6.3), a sample shall be subject
16、ed to first article inspection in accordance with 4.2. 3.2 Design requirements. 3.2.1 Design, materials, and manufacturing processes. The contractor shall select the materials, but the materials shall meet all interface, operational, and performance requirements specified herein. 3.2.2 Recycled, rec
17、overed, or environmentally preferable materials. Recycled, recovered, or environmentally preferable materials should be used to the maximum extent possible, provided that the material meets or exceeds the operational and maintenance requirements, and promotes economically advantageous life cycle cos
18、ts. 3.3 Configuration. The overall ionization smoke sensor shall consist of an ionization smoke sensor head, a universal sensor base, and a junction box. The overall photoelectric smoke sensor shall consist of a photoelectric smoke sensor head, a universal sensor base, and a junction box. Alternatel
19、y, the universal sensor base and junction box may be combined into one unit, provided this one unit meets all of the combined requirements of both the universal sensor base and the junction box. The terms, “ionization smoke sensor” and “photoelectric smoke sensor,” as used in this specification, ref
20、er to the overall smoke sensors consisting of the appropriate smoke sensor head, the universal sensor base, and the junction box or, alternately, the appropriate smoke sensor head and a combined universal sensor base and junction box. 2 Provided by IHSNot for ResaleNo reproduction or networking perm
21、itted without license from IHS-,-,-MIL-PRF-32224 3.3.1 Sensor head. The sensor head shall contain the actual smoke sensing element of the ionization or photoelectric smoke sensor. The sensor head shall be compatible with the universal sensor base and shall securely attach to it but be easily attache
22、d and removed without the need for special tools. Sensor heads shall be easily disassembled for cleaning without the need for special tools. Sensor heads shall operate properly in both overhead (vertical) and bulkhead (horizontal) mounted positions. 3.3.1.1 Interchangeability. The AFSSS ionization s
23、moke sensor head shall have a unique model number and shall be physically identical and interchangeable with all other AFSSS ionization smoke sensor heads from the same manufacturer. The AFSSS photoelectric smoke sensor head shall have a unique model number, different than that of the ionization smo
24、ke sensor head, and shall be physically identical and interchangeable with all other AFSSS photoelectric smoke sensor heads from the same manufacturer. 3.3.1.2 Ionization smoke sensor heads. Ionization smoke sensor heads shall consist of a single radioactive Americium 241 source of 1 microcurie (uCi
25、) or less that ionizes two chambers, which causes a small DC current to flow between the electrodes in each chamber. Smoke shall freely enter one chamber while the second chamber shall be virtually sealed to smoke. Smoke entering the first chamber shall cause a reduction in the DC current, and the i
26、mbalance between the two chambers shall be proportional to the smoke density. When the sensed input value exceeds a predetermined threshold, an alarm shall be indicated. Ionization smoke sensors shall be restorable (see 6.8.14) after a reset (see 6.8.13) of the alarm at the alarm panel is manually e
27、xecuted and the sensor is free of smoke (i.e., ionization smoke sensor alarms shall latch at the alarm panel). 3.3.1.3 Photoelectric smoke sensor heads. Photoelectric smoke sensor heads shall consist of a light emitting diode (LED) and photodiode arrangement. The chamber shall be designed such that
28、light emitted by the LED cannot normally reach the photodiode. In the event of fire, particles of smoke enter the chamber and scatter the light. As the smoke level increases, the scattering effect increases, causing more light to hit the photo diode until an alarm is indicated at a predetermined thr
29、eshold. Photoelectric smoke sensors shall be restorable after a reset of the alarm at the alarm panel is manually executed and the sensor is free of smoke (i.e., photoelectric smoke sensor alarms shall latch at the alarm panel). 3.3.2 Universal sensor base. The universal sensor base shall securely a
30、ccept attachment of ionization smoke sensor heads, photoelectric smoke sensor heads, and AFSSS heat sensor heads. The base shall be universal, permitting direct interchange between and compatibility with the ionization smoke sensor head, the photoelectric smoke sensor head, and the AFSSS heat sensor
31、 head from the same manufacturer. Universal sensor bases shall operate properly in both overhead (vertical) and bulkhead (horizontal) mounted positions. The universal sensor base and junction box may be combined into one unit, provided this one unit meets all of the combined requirements of both the
32、 universal sensor base and the junction box. 3.3.2.1 Interchangeability. The AFSSS universal sensor base from the same manufacturer shall have a unique model number assigned to it, and shall be physically identical and interchangeable with all other AFSSS universal sensor bases from the same manufac
33、turer. 3.3.3 Individual addressability and LED. Either the sensor head or the universal sensor base shall have an adjustable mechanical device or dipswitch that can be easily set to allow each sensor to be individually identifiable and addressable (see 6.8.1) by the alarm panel once installed in a s
34、pecific location in a shipboard compartment. Once set, this device or dipswitch shall be easily capable of later being set to a different address, without the use of special tools or equipment, to support sensor head or base interchangeability. Either the sensor head or the universal sensor base sha
35、ll also contain one or more LEDs. Failure of any LED shall not interfere with the operation of the head or base or the transmission of sensor information or alarm or trouble signals (see 6.8.21) to the alarm panel. The LED(s) shall be capable of visually showing the condition of the sensor head and
36、universal base. The LED(s) shall distinctly identify the three possible sensor states: State 1: Power is not being supplied to the sensor or the sensor is not properly operating (darkened LED). State 2: Power is being supplied to the sensor and the sensor is operating but is not in an alarm state. S
37、tate 3: Power is being supplied to the sensor and the sensor is in an alarm state. 3 Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-PRF-32224 3.3.4 Junction box. A junction box shall securely accept attachment of the universal sensor base. The j
38、unction box and universal sensor base may be combined into one unit, provided this one unit meets all of the combined requirements of both the universal sensor base and the junction box. All junction boxes from the same manufacturer used for ionization and photoelectric smoke sensors shall be identi
39、cal, and shall also be identical to those used for AFSSS heat sensors. The junction box shall possess two flat areas to allow two separate LS2SWU-1 cables (see MIL-DTL-24643) with appropriate watertight stuffing tubes (see MIL-E-2036) to penetrate the junction box. The conductors of the LS2SWU-1 cab
40、les shall provide sensor power and supervision from the alarm panel and shall be wired to the universal sensor base. The junction box shall provide a conductive path for the shields of the LS2SWU-1 cables to connect to ships hull to provide shield termination. The junction box shall possess mounting
41、 tabs or brackets with clearance holes for bolts that will secure the junction box to 1-inch long threaded-female metal standoffs welded to the overhead or bulkhead of the compartment. When installed on the overhead of a compartment, the junction box shall be drip-proof such that water falling from
42、above shall not enter the junction box. Therefore, standard 4-inch electrical boxes with holes or knockout plugs (which are commonly used for mounting commercial grade smoke sensors and bases, but are not drip-proof) are not permitted as junction boxes. 3.4 Drip-proof. When installed on the overhead
43、 of a compartment, the overall smoke sensor shall be drip-proof (15 degrees) in accordance with MIL-E-2036 such that water falling from above shall not enter the junction box, universal sensor base, or sensor head. 3.5 Weight. The total weight of the ionization smoke sensor (consisting of the sensor
44、 head, the universal sensor base, and the junction box) shall not exceed 3 pounds. The total weight of the photoelectric smoke sensor (consisting of the sensor head, the universal sensor base, and the junction box) shall not exceed 3 pounds. 3.6 Size. Ionization and photoelectric smoke sensors (cons
45、isting of the sensor head, the universal sensor base, and the junction box) shall have a low profile. The maximum height of the overall ionization smoke sensor, assembled with sensor head mounted on the universal base and the junction box, shall not exceed 7 inches. The maximum height of the overall
46、 photoelectric smoke sensor, assembled with sensor head mounted on the universal base and the junction box, shall not exceed 7 inches. The maximum diameter of the overall ionization or photoelectric smoke sensor shall not exceed 8 inches. 3.7 Interface requirements. 3.7.1 Electrical interface. Ioniz
47、ation and photoelectric smoke sensor heads and their universal sensor bases shall obtain power from and be compatible with the UL listed AFSSS alarm panel. The universal bases of ionization and photoelectric smoke sensors shall be two-conductor devices, whose power supply terminals are the same as t
48、heir signaling terminals. The cable used to interface the alarm panel with the ionization and photoelectric smoke sensors (via their universal bases and junction boxes) shall be LS2SWU-1. The LS2SWU-1 cabling shall be routed from the alarm panel to the various sensors throughout the ships compartmen
49、ts and then return to the alarm panel in a looped NFPA 72, Style 6, Class A signaling line circuit (see 6.8.17) arrangement so that single opens on the loop will not result in the loss of any sensors. 3.7.2 Ship interface. The ionization and photoelectric smoke sensors shall attach to their universal bases, which, in turn, shall attach to their junction boxes. These junction boxes shall be mounted with bolts to 1-inch long threaded-female metal standoffs welded onto the overheads and bulkhe
