1、MIL-I-2L20bB bb = 999990b 04b8227 5 i MIL - 1-2 120 6B (WEP) I5 November 2960 Super seing 15 July 1958 MILI-21 206A (Am 1 MILITARY SPECIFICATION INDICATOR RATE OF FLOW, FUEL; EFU-7/A 300-5000-15000 PPH) This specification has been approved by the Bureau of Naval Weapons, Department of the Navy. 1. S
2、COPE 1.1 Scope. - This specification covers the design and performance requirements for the procurement of one type of a remote, single indicating, integrally lighted, fuel, rate of flow indicator. 2. APPLICABLE DOCUMENTS 2.1 The following documents, of the issue in effect on date of invitation for
3、bids, form a part of this specification to the extent specified herein: SPECIFICATIONS Federal DD-G-451 - Glass, Flat and Corrugated, for Glazing, QQ-P-416 - Plating, Cadmium (Electrodeposited) Mirrors and other Uses Military MIL-P- m-5272 MIL-M-3171 MIL- C- 5541 MIL-S-6872 MIL-1-7566 MIL-P-7936 MIL
4、-A-8625 - Preservation, Method of - Magnesium Alloy, Processes for Corrosion Protection of - Environmental Testing, Aeronautical and Associated Equipment, General Specifi- cation for - Chemical Films for Aluminum and Aluminum Alloys - Soldering Process, Cieneral Specification - Indicator System, Fue
5、l Flowmeter, General - Parts and Equipment, Aeronautical, Prepara- - Anodic Coatings, for Aluminum and Aluminum for Specification for tion for Delivery Alloys Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-I-2L20bB 66 = 9999906 0468228 7 - Mu-I-
6、21206B (WEP ) MIL-(3-13335 - Coatings for Magnesium and Magnesium Alloys MIL-S-20708 - Synchros, 60 and 400 Cycle, General Specification for MU-T-21205 - Transmitter, Rate of Flow. Fuel: Tne m-L-25467 - Lighting, integral, instrument, eneral Specification for MU-c-26482 - Connectom, Electric, Circul
7、ar, Mlnia- ture, Quick Disconnect TRU-l2/A (3OO-5000-15,OOO PPH) STANDARDS Federal FED STD No. 595 - Colors Military MIL-STD-74 - Electric Power, Aircraft, Characteris- m3134 m33558 tics and Utilization of Mounted ment Dial, Standard Form of craft instrument craft = Connector, Electrical Receptacle,
8、 Solder - Numerals and Letters, Aircraft nstru- m33585 - Pointers, Dial, Standard Design of Air- I m33639 - Case, Instrument, Clamp-Mounted, Air- (When requesting specifications, standards, drawings, and publications refer to both title and number. specification and applicable specifications may be
9、obtained upon application to the Commanding Officer, Naval Supply Depot, 5801 Tabor Avenue, Philadelphia 20, Pennsylvania, Attention: Code CDS) Copies of this 3. REQUREMWi“T 3.1 Qualification. - The Indicator furnished under this specification shall b e a product which has been tested, and passed th
10、e qualification tests specified herein, and has been listed on or approved for listing on the applicable qualified products list. 3.2 General specification. - The requirements of Specifi- cation - 6 apply as requirements of this specification with th-ons and additions called out herein. When the two
11、 specifications conflict, this specificasion shall govern. 2 - Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-P HIL-I-2L206B 66 9799906 OLIb8229 9 _L7 3.3 Design and construction. - 3.3.1 eneral. - The indicator shall be designed to supply power and
12、-ated to operate satisfactorily with a 300-000-15000 pph transmitter in accordance with Specification 3.3.2 Calibration. - Each indicator dial shall be graduated in accordance with P igure 1. The calibration of fuel flow ver- sus angular degrees shall be linear within I015i of arc, excee protection.
13、 - The indicator shall not be damaged by voltages below the mlnirmun specified and shall automatically resume normal operation when the voltage returns within its correct range. 3.4.4 Electrical characteristics. - Sufficient electrical tests shall b e performed by the manufacturer on the Indicator a
14、nd its components to insure satisfactory perfomaance when connected ln a complete flowmeter system as specified in 3.3.3. 3.4.4.1 Frequency inverter voltage. - The voltage supplied bs the indill not exceed I.%$ * 30,%-400 cps I.25$ when subjected to normal; high and low tempeFatures . 3 Provided by
15、IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,- - MIL-I-21206B 66 9999906 0468230 5 MIL-1-21 206B (WEP) - The external wiring of the eystem ahdl be Wires shall be tied to the terminals prior to a8 3b4*5 shown W. gure 2. internal wiring shall be neat and accompl
16、ished in such a manner that indfvidual wires mag be easily traced. soldering, where practicable. The wiring shall be Insulated from the indicator case except for the lighting cj-rcuite 3.4.6 Electrical receptacle. - The irid%catsf aka11 be p%a- vided with an electrical receptacle conforming to Speci
17、fication MU-C-26482 and to Standard Ms3134-12P. receptacle shall be mounted on the rear surface of the ease with the polarizing keyway of the receptacle at the tog center of the receptacle shell . The electrical 3.5 Dial. - - 3.5.1 Dial diameter, - The dial shall have a mLnabmum diameter of 1 3/4 in
18、 ches as measured at the outa.i.de ends of the scale graduations. 3.5.2 Dial mark - Dial marking8 shP% be dusable and in accordance -7i U O t- f o D 7 - - I!? o P a O - r - a W k c- I- 12 a a m z 4- I I o a 0 z I I I P W z O i- (3 Ir. a - E W I- V) * V) J o Li: c o W -I W LL O W V) P w P z 3 O c9 W
19、O c a - n - m z U (3 a a Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-1-212066 66 m 9999906 0468233 O m MIL-I-21206B( WEP) 3.5.2.1 Electrical zero reference mark. - The dial shall be provided with an electrical zero reference mark equidistant
20、between the first and last graduations of the dial and shall be located on the outer edge of the dial so that it is visible through the window glass. shall be finished in durable dull white and shall be 1/32 Inch long and 0.010 Inch wide. defined as synchro zero as specified In Specification The ele
21、ctrical zero reference mark 3.5.2.1.1 Electrical zero. - Electrical zero shall be MI Gs-20708 3.5.2.2 Other mark . - The type designation EFU-7/A shall be permanen 4 y an legibly marked on the dial In 3/64 inch letters. This marking and all other rearkings not otherwise specified shall be finished I
22、n a lusterless black color. 306 Pointer. - The pointer shall conform to Standard MS3358$8 except that the pointer shall be suitable for integral lighting the pointer which are shown as shaded on Standard MS33585; shall be finished in a lusterless white color. Portions which are shown as unshaded on
23、Standard MS3358S shall be finished in a lusterless black Portions of color. 3.7 Visibility of pointer and dial. - The pointer, numerals, at least l/l6 i nch of th e shortest graduations, and all other specifled markings on the dial with the exception of the electrical zero reference mark shall be vi
24、sible frob any point within the frustum of a cone whose sides make an angle of 150 with a perpendicular to the dial and whose small diameter is the aperture of the case. be Integrally li Specification 1. - The case shall provLde a hermetically sealed enclosure for al$ of the mechmbsm. The case shall
25、 be so constructed that it my be opened, the mechanism removed and replaced and the case reclosed ad resealed, at least three times. This shall be possible w$%hout the use of any special tool, jig or fixture, unless such device 1s specifically approved by the procuring activity, The sealing of the c
26、ase shall not be dependent upon any material whish will be adversely affected by any atmosphere to wh%ch the %ndicator may be subJected in normal use in military airPcraft, 3.10.2 Filling medium. - The filling mediaaria shall be at least 98 percent purity, free of dust particles and containing not m
27、ore than 0.006 milligram of water vapor per %iter (dew point -65C) at the filling pressure. The f%l%ng medliun shall be either 100 percent helium or a mixture 0% 88 to 92 percent nitrogen and the remainder helium. The absolute pressure of the filling medium in the case shall be approximately l atmos
28、phere or 1/2 atmosphere as required. 100 percent helium filling medium shall be u$il%zed. Where practical, the 3.11 Performance. - The indicator shall perfom satbsfee- torily when subjected to the tests specified in SeetBon 4, 3.12 Wei ht. - The weight of the complete indlcats shall not exce-I-21206
29、B(WEP) Specification MIL-A-8625 except that the dial, if of alumlnuai alloy, small holes, pipe threads and case Inserts need not be anodized. Alutninum alloys which do not anodize satisfactorily shall be coated with chemical film in accordance with Specification MIL-C-5541. 3.13.3 Steel arts, - Stee
30、l parts shall be cadmium plated, where prac use PPH 25 12Oc 70“ 12Oc -55“ i2OC 300 500 i500 2500 2;: 6000 goo0 12000 i5000 Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL- I-21206B( WEP ) Table III INDICATOR TEST TOLERANCES Requirement8 Tolerance
31、 IPPH 300-4900 0001000 Position Error at 3500 PPH Voltage and frequency variation effects tested on a system basis Friction Room temperature High temperature Low temperature Vibration Pointer oscillation (double Pointer variation amplitude) Response Time 300-15000 PPH The pointer shall not overshoot
32、 the final position more than 1 time Scale Error After Endurance 15 - I1/2$. of point above i500 PPH except break point and 7.5 PPF below 1500 PPH 200 200 25 25 5 seconds max. 2 seconds min. Room Temp. Tolerance - 10 - 4- 30 11 Provided by IHSNot for ResaleNo reproduction or networking permitted wit
33、hout license from IHS-,-,-MIL-I-ZL20bB bb 9999906 04b23 T MIL-I-21206B( WEP ) 4.2 Test methods. - 4.3 individual tests. - 4.3.1 Sealinq. - The indicator shall be tested for leaks by means of a mass spectrometer type of helium leak detector. Where a nitrogen-helium mixture is utilized as the filling
34、medium, the detected leak rate shall not exceed 0.010 micron cubic foot per hour at a pressure differential of 1 atmosphere or 1/2 atmosphere dependent upon the filling pressure. Where 100 percent helium is utilized as the filling medium, the leak rate shall not exceed 0.10 micron cubic foot per hou
35、r. This test shall be conducted In lieu of the sealing test specified in Specification MIL-I-7566. 4.4 Sampling p 1a.n A, - 4.4.1 motor load shall b e connected to the indi cator and a test Frequency inverter voltage variation. - A transmitter voltage of iiw, 400 cps supplied to the indicator. The v
36、oltage supplied to the motor of the transmitter shall be measured and the voltage shall not exceed 119 *i. quency of the voltage shall then be measured with an electronic counter similar to Hewlett Packard Model 522B. variation shall not exceed 400 cps I.25 percent, placed in a test chamber and prop
37、erly connected except that no power shall be applied. The instrument shall then be sub- jected to an ambient temperature of -54“(-65“) for a period of 4 hours. ower shall be applied to the indicator. At the end of the z -hour period and with the temperature maintained at -54“C(-65“F) the indicator s
38、hall be subjected to and shall meet the requirements specified in the following tests: 1. Scale error and friction. The tolerances shall be The fre- The frequency 4.4.2 Low temperature operation. - The indicator shall be During the last 5 minutes of the 4-hour period, as specified in Table III. 2. H
39、igh temperature operation. - The Indicator shall be Frequency inverter voltage variation (see 4.4.1). placed in a test chamber and properly connected except that no power shall be applied. The indicator shall then be subjected to an ambient temperature of 71C(1600F) for a period of 4 hours. shall be
40、 applied to the indicator. 4.4.3 During the last 5 minutes of the +-hour period, power At the end of the 4-hour Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-I-21206B( WEP ) period and with the temperature maintained at 71C(1600F), the indicato
41、r shall be subjected to and shall meet the requirements specified in the following tests: 1. Scale error and friction. The tolerances shall 2. be as specified in Table III. Frequency inverter voltage variation (see 4.4.1) . 4.4.4 Vibration. - 4.4.4.1 Indicator. - This test shall be conducted in acco
42、rdance with vibration test procedure IV of Specification MU-E-5272 at an amplitude of 0.009 to 0.011 inch diameter. Test conditions shall be applied to the system to provide an indication of approximately half-scale. Pointer oscillation and variation shall not exceed the tolerances specified in Tabl
43、e III. After vibration the indicator shall be subjected to the scale error test. The scale errors shall not exceed those specified in Table III. 4.4.4.2 Frequency inverter voltage variation. - This test shall be conducted in accordance with vibration test procedure N of Specification MIL-E-5272 at a
44、n amplitude of 0.009 to 0.011 inch diameter. While being vibrated, the indicator shall meet the frequency inverter voltage variation test (see 4.4.1). 4.4.5 Voltae and frequency variation effect. - This test shall be run with th e transmitter load on the indicator and . _. tested on a system basis.
45、for the test shall be set at the following point: The applied voltages and frequencies 115V 400 cps 138V 480 cps 92V 320 CPS The voltage and frequency variation effect shall not exceed the tolerance specified in Table III. 5. PREPARATION POR DELIVERY 5.1 Packaging. - 5.l.l Level A. - The indicator s
46、hall be packaged in accord- ance with-ication MIL-P-7936. The method of preservation shall be in accordance with Specification MIL-P-116, Method lA5, omitting preservation compound, using metal reusable containers (see 6.2). Provided by IHSNot for ResaleNo reproduction or networking permitted withou
47、t license from IHS-,-,-MU- I-21206B (WEP ) 5.1.2 Level C. - When this level is required, packaging shall be inrdance with standard comercial practices. 5.2 Packinq. 5.2.1 Levels A and B. - The indicator shall be packed In accordance with Specification Mu-P-7936. required shall be as specified in the
48、 Invitation for bid or contract (see 6.2). The level or levels 5.2.2 Level C. - The indicator shall be packed to insure that the shipment arrives in a satisfactory condition at destination. The shipment shall conform to thre applicable carriers rules and regulation in effect at the time of shipment.
49、 marked as specified in Specification 1-7936. 5.3 Markinq. - The Interior and exterior containers shall be 5.3.1 Precautionary marking. - The following precautionary marking shall appear on two opposite sides of each interior package and shipping; container- whenever pract icable depending on the size of the carton: FRAG= DELICATE INSTRUMENTS HANDLE WITH
