1、 Comments, suggestions, or questions on this document should be addressed to U.S. Army RDECOM, Tank Automotive Research, Development and Engineering Center, ATTN: RDTA-EN/STND/TRANS MS#268, 6501 E. 11 Mile Road, Warren, MI 48397-5000 or emailed to DAMI_STANDARDIZATIONconus.army.mil. Since contact in
2、formation 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 6665 METRIC MIL-PRF-62546C 26 January 2010 SUPERSEDING MIL-PRF-62546B(AT) 5 January 1998 PERFORMANCE SPECIFICATION SENSOR, FIRE, OPTICAL T
3、his specification is approved for use by the U.S. Army Tank Automotive Research, Development and Engineering Center (TARDEC), Research, Development and Engineering Command (RDECOM), Department of the Army, and is available for use by all Departments and Agencies of the Department of Defense. 1. SCOP
4、E 1.1 Scope. This specification covers two types of optical fire sensor assemblies (OFSAs), components of the Halon 1301 automatic fire extinguishing systems used in military vehicles. The OFSA detects and signals the presence of a hydrocarbon fire requiring a system response (see 6.1). 1.2 Classifi
5、cation. OFSAs will be of the following types, as specified (see 6.2): Type I - Discriminatory Type II - Non-discriminatory 2. APPLICABLE DOCUMENTS 2.1 General. The documents listed in this section are specified in sections 3, 4, or 5 of this specification. This section does not include documents cit
6、ed 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 documents cited in sections 3, 4, or 5 of this
7、 specification, whether or not they are listed. Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-PRF-62546C 2 2.2 Government documents. 2.2.1 Specifications, standards, and handbooks. The following specifications, standards, and handbooks form a p
8、art of this document to the extent specified herein. Unless otherwise specified, the issues of these documents are those cited in the solicitation or contract (see 6.2). DEPARTMENT OF DEFENSE STANDARDS MIL-STD-461 - Requirements for the Control of Electromagnetic Interference Characteristics of Subs
9、ystems and Equipment (See 4.3.1) MIL-STD-810 - Environmental Test Methods and Engineering Guidelines (Copies of these documents are available online at https:/assist.daps.dla.mil/quicksearch/ or from the Standardization Document Order Desk, 700 Robbins Avenue, Building 4D, Philadelphia, PA 19111-509
10、4.) 2.2.2 Other Government documents, drawings, and publications. The following other Government documents, drawings, and publications form a part of this document to the extent specified herein. Unless otherwise specified, the issues of these documents are those cited in the solicitation or contrac
11、t (see 6.2). U.S. ARMY TACOM DRAWINGS 12343265 - Connector, Electrical Receptacle (Interface) 12370458 - Optical Fire Sensor Assembly (Interface) TEST PROCEDURES Nuclear Survivability Criteria - Nuclear Survivability Criteria for the Automatic Fire Extinguishing System (AFES) (U). Document is classi
12、fied “Confidential”. (see 6.9) (Copies of these documents are available from DAMI_STANDARDIZATIONconus.army.mil or U.S. Army RDECOM, Tank Automotive Research, Development and Engineering Center, ATTN: RDTA-EN/STND/TRANS MS #268, 6501 E. 11 Mile Road, Warren, MI 48397-5000.) 2.3 Non-Government public
13、ations. The following documents form a part of this document to the extent specified herein. Unless otherwise specified, the issues of these documents are those cited in the solicitation or contract (see 6.2). Provided by IHSNot for ResaleNo reproduction or networking permitted without license from
14、IHS-,-,-MIL-PRF-62546C 3 ASTM INTERNATIONAL ASTM G21 - Determining Resistance of Synthetic Polymeric Materials to Fungi, Standard Practice for (Copies of these documents are available from www.astm.org or ASTM International, P.O. Box C700, West Conshohocken, PA 19428-2959.) 2.4 Order of precedence.
15、Unless otherwise noted herein or in the contract, in the event of a conflict between the text of this document 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 be
16、en obtained. 3. REQUIREMENTS 3.1 First article. When specified (see 6.2 and 6.3), a sample shall be subjected to first article inspection in accordance with 4.1.1. 3.2 Design, materials, and manufacturing processes. Unless otherwise specified (see 6.2), the design, materials, and manufacturing proce
17、ss selection is the prerogative of the contractor as long as all items fully meet the operating, interface, ownership and support, and operating environment requirements specified. 3.2.1 Recycled, recovered, or environmentally preferable materials. Recycled, recovered, or environmentally preferable
18、materials shall 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 costs. 3.3 Operating requirements. The OFSA shall be designed to function in a military vehicle automatic
19、 fire extinguishing system. The OFSA shall optically detect and signal the presence of a hydrocarbon fire. The OFSA shall provide signals in response to the built-in-test-equipment (BITE), indicating its functional condition. Each OFSA shall provide the following functional, operational, and perform
20、ance capabilities. 3.3.1 BITE. The OFSA shall conduct a total electronic check (see 3.3.3.1.3) when it receives a BITE activation signal on pin E (see table III). Each OFSA shall generate optical stimuli causing the OFSA to generate both a small fire and a large fire signal. The stimuli source may b
21、e external to the OFSA protective window(s). A check for dirty sensor windows shall be included (see 4.3.3.1). 3.3.2 Voltage characteristics. The OFSA shall conform to appendix A without loss of effectiveness and without causing damage or malfunction to interfacing components. The OFSA shall not fal
22、se alarm before, during, or after testing (see 4.3.3.1 and 6.6.3). Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-PRF-62546C 4 3.3.3 Performance. The OFSA shall be capable of detecting hydrocarbon mist or surface fires, differentiating between l
23、arge and small fires and providing an appropriate output response. Response to a large or small fire shall be an output signal “A” at connector pin C and/or D (see table III). Signal “A” is defined as 10 to 30 volts direct current (Vdc), source output impedance less than or equal to 2000 ohms, load
24、output impedance less than or equal to 20,000 ohms; Quiescent conditions: 1 Vdc maximum, input impedance ( source and load) greater than or equal to 20,000 ohms. Specific response requirements are given in subsequent paragraphs. 3.3.3.1 Response characteristics. The OFSA shall respond to radiation s
25、timuli as indicated in the following paragraphs. 3.3.3.1.1 Field of view (FOV). The FOV of the OFSA shall be, as a minimum, a 90 degree () solid cone. Anywhere within the FOV the OFSA shall meet the response characteristic requirements specified herein. (see 4.3.3.2) 3.3.3.1.2 Thresholds. The OFSA s
26、hall respond to two discrete energy threshold levels: A lower energy threshold, small fire, and a higher energy threshold, large fire. 3.3.3.1.2.1 Small fire. The OFSA shall generate a SMALL FIRE SIGNAL on pin D (see table III) within 5 seconds (s) and as long as fire exceeds threshold (see 4.3.3.3)
27、. 3.3.3.1.2.2 Large fire. The OFSA shall generate a LARGE FIRE SIGNAL on pins C and D (see table III) within 5 s and for as long as fire exceeds threshold (see 4.3.3.4). 3.3.3.1.3 BITE characteristics. Upon receipt of a BITE signal on pin E (see table III), the OFSA shall generate optical stimuli to
28、 perform a complete functional self test (see 3.3.1). If the OFSA is functioning properly and the optical window(s) does not require cleaning, the OFSA shall generate FIRE signals for less than 5 millisecond (ms) on pins C and D within 5 s after start of BITE signal. If the OFSA is not functioning p
29、roperly or requires window cleaning, it shall not generate output FIRE signals from a BITE signal (see 4.3.3.5). 3.3.3.1.4 Response time. At all temperatures between -17 and 71 C (1 and 160 F), the OFSA shall respond to radiation and provide the appropriate signal(s) within the following times (see
30、4.3.3.6): Time (ms) a. Type I OFSA 4 b. Type II OFSA 3 3.3.3.1.5 Penetration response time. The OFSA shall respond within the time specified in 3.3.3.1.4, to a hydrocarbon fire ignited subsequent to and resulting from penetration of steel and aluminum armor by threat munitions (see 4.3.3.8). Provide
31、d by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-PRF-62546C 5 3.3.3.2 False alarm susceptibility. The OFSA shall respond to radiation stimuli as indicated in the following paragraphs. 3.3.3.2.1 Radiation stimuli. The OFSA shall not respond at distances e
32、qual to or greater than the immunity distance when exposed to the radiation sources of table I throughout the FOV of the OFSA (except for chopped light requirements) (see 4.3.3.7 through 4.3.3.7.15). 3.3.3.2.2 Penetrating munitions. Type I OFSAs shall not respond to the high intensity, short duratio
33、n emissions (in relation to hydrocarbon fires) caused by munition penetration of aluminum and steel armors. The OFSA shall demonstrate a minimum discrimination level (not generate large fire signals on pin C) as shown in table II (see 4.3.3.8). 3.3.3.2.3 Nuclear hardening. Requirements for nuclear s
34、urvivability shall be as specified in a separate classified (confidential) document entitled “Nuclear Survivability Criteria for the Automatic Fire Extinguishing System (AFES)” (U) (see 4.3.3.9 and 6.9). 3.3.3.2.4 Slow growth pan-fire. The OFSA shall generate output signal “A” on pins C and D when e
35、xposed to a slow growth pan-fire (4.3.3.10 and 4.3.3.10.1). 3.3.3.3 Start-up. The OFSA shall not false alarm upon the application of 15 to 30 Vdc step inputs across pins A and B (initial power-on condition) (see 4.3.3.11). 3.3.3.4 Power. The OFSA shall be effective over an input voltage range of 15
36、to 30 Vdc, in accordance with appendix A, and shall not require more than 150 milliamperes (mA) when active. The OFSA shall not draw more than 15 mA nor less than 7.5 mA during quiescent operation (see 4.3.3.12). 3.3.3.4.1 Input voltage decay. The OFSA shall not false alarm (produce small or large f
37、ire output signals) when undergoing input voltage decays resulting from prolonged operation without recharging of the battery (see 4.3.3.13). 3.3.3.4.2 Steady state voltage extremes. The OFSA shall sustain no damage from the application of any steady state voltage up to 40 Vdc. Subsequently, the OFS
38、A shall meet the requirements of 3.3.3.1 and 3.3.3.2 (see 4.3.3.14). 3.3.3.5 Electromagnetic interference (EMI). The OFSA shall meet the requirements specified below (see 4.3.3.15). 3.3.3.5.1 Conducted emissions (30 Hz to 50 kilohertz (kHz). Electromagnetic emissions shall not appear on dc power lea
39、d (primary or secondary) in excess of the values shown in figure 1. 3.3.3.5.2 Conducted emissions (10 kHz to 50 megahertz (MHz). Electromagnetic emissions shall not appear on ac or dc power leads in excess of the values shown in figures 1 through 4. Provided by IHSNot for ResaleNo reproduction or ne
40、tworking permitted without license from IHS-,-,-MIL-PRF-62546C 6 TABLE I. False alarm susceptibility. Radiation source description Immunity distance mm 1/ (in. 1/) Small fire Large fire Sunlight IAD 2/ IAD Incandescent frosted glass light, 100 Watt (W) 150 (6) 25 (1) Incandescent clear glass light,
41、rough service, 100 W 225 (9) 50 (2) Fluorescent light with white enamel reflector, standard office or shop, 40 W (or two 20 W) 150 (6) IAD Electrical arc 12 mm (15/32 in.) gap at 4000 V 1/ alternating current, 60 Hz 1/ 25 (1) 25 (1) Ambient light extremes (vehicle darkness to bright light with snow,
42、 water, rain, desert glare and fog) IAD IAD Bright color clothing, including red and safety orange at 1500 mm (60 in.) and to near zero IAD IAD Electronic flash (180 watt-seconds minimum output) 450 (18) 225 (9) Movie light, 625 W quartz DWY lamp (Sylvania S.G.-55 or equivalent) 1200 (48) 600 (24) R
43、ed vehicular dome light IAD IAD Blue-green vehicular dome light 24 V of direct current (dc) IAD IAD Flashlight IAD IAD Indirect or reflected sunlight IAD IAD Chopped light - individual sources 3/ 3/ Chopped light - combination of sources 4/ 4/ Radiation heater, 1500 W 900 (36) 450 (18) Radiation hea
44、ter, 1000 W with fan 600 (24) 300 (12) Arc welding 4 mm (5/32 in.) rod; 300 A 1/ 1500 (60) 300 (12) Acetylene welding 00 tip, 16 x 150 mm (5/8 by 6 in.) flame 1500 (60) 300 (12) Rifle flash from M16 rifle 250 (10) 50 (2) Muzzle flash from 105 mm gun 5/ 5/ Lit cigar 100 (4) 25 (1) Lit cigarette 100 (
45、4) 25 (1) Match, wood, including flare up 300 (12) 100 (4) Match, paper, including flare up 200 (8) 100 (4) 1/ Abbreviations as follows: mm millimeters in. inches V volts A amperes Hz hertz Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-PRF-6254
46、6C 7 2/ Immune at Any Distance (IAD). Includes the case when stimuli is physically as near the sensor as possible. 3/ To be the same immunity distance as when not chopped. 4/ The immunity distance of the combination indicated when not chopped, for instance, 300 and 50 mm (12 and 2 in.), the immunity
47、 distance is 300 mm (12 in.) for combination. 5/ Distances to be observed. TABLE II. Discrimination performance. Armor Munition Discrimination requirement 32 mm (1.25 in.) aluminum 25 mm (1 in.) kinetic energy 90% 51 mm (2 in.) steel 38 mm (1.5 in.) chemical energy 90% 32 mm (1.25 in.) steel appliqu
48、e over 25 mm (1 in.) aluminum with spall liners 89 mm (3.5 in.) chemical energy 90% 3.3.3.5.3 Conducted susceptibility (30 Hz to 50 kHz). Performance characteristics shall not degrade beyond the tolerances given herein when subjected to electromagnetic energy injected on its dc power leads equal to
49、or less than the values shown in figure 5. 3.3.3.5.4 Conducted susceptibility (50 kHz to 400 MHz). Performance characteristics shall not degrade beyond the tolerances given herein when subjected to the specified power levels on figure 6 are applied to the equipment power input terminals. 3.3.3.5.5 Conducted susceptibility. There shall be no degradation of performance or malfunction when the spike shown in figure
