1、I MIL-C-26028 66 9 9999906 0134122 7 9 1, SCOPE 1.1 This specification covers an item to fill a need for a self-contained aboratory prniary standard for the calibration of fluid flow measuring system, or sensrs. systems ara employed at the Yright Air Development Center, for test- ing of developent a
2、nd pcoituction type aircraft engines and compon- ents, and at various Air Materiel Areas for production testing air- craft engines and aircraft comporients. These systems are used in the precise measurement of the rate of flow of fluids, of various densities an viscosities, to the teat article, and
3、under varying conditione of temperature and pressure. method of obtaining a satisfactory calibration of these flou system and sensora. Tha intended use dictates a calibrator thut will min- tain a high degree of accuracy for extended periods; cover a wide range of flows; and be extremely easy to main
4、tain and operate. precludes compliance with United States Air Force climatic and environmental requirements. Fluid flow measuring The calibrator provides a Also, Specific flow ranges shall be covered by tyges. b2 CLASSIFICATION.- Calibrators shall be one of the following types as specified: Type Mi3
5、-2 Tme IvB-3 Type MB- these requirements being detailed only to the extent consiered necessary to obtain the desired mechanical and electrical characteristics, performme, and permanence in accuracy of indications. its component parts shall be such as to facilitate ease of niaintenance and simplicity
6、 of operation. . The design layout and assembly of the calibrator and 3.4.3 C0NS“RCTION.- Components and controls of the stand shall It shall be designed and constructed so that the operating procedure will be simple and direct, and can be.handled by a single operator, be built to withstand conditio
7、ns incident to shipping, storage, in- stallation, and prolonged service. Adhesives shall be in er that does not require an external source of frequency control. employing a deciml type readout for automtic display of the measured time period. The tianr heving a self-contained frequency standard, and
8、 also 3.4.6 COW123.- Two electronic couitsrs shall be provided one for tot-al pulse ccunt and one fcr CPS count during the run. t.:i13. have preaiplifiers, if necessary, to count from 10 mv at 10 CkS as a ir.inj.mum valve. The counters 3.4.7 C0“RUS.- All controls and switches necessary for stand ope
9、ration shall Se located on a recessed front panel. 3.11.7.1 STOPPING.- Synchronous switches end .controls, for startinc and stopping all tirrdng and messuring devices simultaneously, shall be provided. 3.4.7.2 T33PIBATRES.- Autoritic contrd shall be prcvided to maintain the te3t fluid tscrpersture t
10、o within +2OF. at the inlet to $hc Vest item, over en mbient tenperature ranee of +?O0 to +150F, and the retsd flow rence. 3.4.7.3 RUG3 SELECTiTBJ.- In +,he event the rated range requires two flcw circ1lif.s, selection of flow rani:es shall be aCcnpliShcd maniielly by means of R single switch. 3.4.8
11、 fi3PS.- Pups shall he of ths centrifugal type cecpable of deliwring the rated flow with a minimum pressure of 20 psig at %he inlet to the test article. 3.4.9 FILTERS.- Filters for retad flow renge of 500 pounds per hour End up and the fact that the Government may have forrriulated, furnished, or in
12、 any way supplied the said drawings, specifications, or other data, is not to be regarcled by inqlication or otherwise as in any manner licensing the holder or any other person or corporation, or conveying any rights or permission to mufacture, use, or sell any patented ifivention that my in any way be related thereto. WCLPD-1 HwL/b ja r. I Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-
