1、 Beneficial comments, recommendations, additions, deletions, clarifications,etc., and any other data which may improve this document should be sent to:Commander, Naval Sea Systems Command, ATTN: SEA 05Q, 1333 Isaac Hull Avenue,SE, Stop 5160, Washington Navy Yard DC 20376-5160.FSC 6680A-A-597349 Augu
2、st 2002SUPERSEDINGMIL-T-16049C10 January 1980COMMERCIAL ITEM DESCRIPTIONTACHOMETER, VIBRATING REEDThe General Services Administration has authorized the use of this commercialitem description, for all federal agencies.1. SCOPE1.1 Scope. This commercial item description (CID) covers single range fixe
3、dand portable resonant tachometers capable of indicating rotational speed forNaval shipboard use.2. CLASSIFICATION2.1 Types. Tachometers shall be of the following types, as specified:FR Resonant, fixed, single rangePR Resonant, portable, single range2.2 Range. The types FR and PR tachometers shall c
4、onform to the applicableranges and normal reed intervals shown in table I.TABLE I. Ranges and normal reed intervals.Range Nominal operatingspeed (RPM)Scale range(RPM)Normal intervalbetween reeds (RPM)A 1,000 900 1,200 10B 1,200 900 1,500 20C 1,500 1,200 - 1,800 20D 1,800 1,425 - 2,175 25E 2,000 1,62
5、5 - 2,375 25F 2,500 2,175 - 2,875 25G 3,000 2,250 - 3,750 50H 3,600 2,850 - 4,350 50I 4,000 3,250 - 4,750 50J 5,000 4,250 - 5,750 50K 6,000 5,250 - 6,750 50L 7,000 5,500 - 8,500 100M 8,000 6,500 - 9,500 100N 10,000 9,000 - 12,000 100O 12,000 9,000 - 15,000 200P 15,000 12,000 18,000 200Q 18,000 15,00
6、0 21,000 200R 20,000 18,000 24,000 200METRICProvided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-A-A-5973423. SALIENT CHARACTERISTICS3.1 Design and construction. The fixed and portable tachometers shall be ofthe vibrating resonant reed type and shall indi
7、cate continuously instantaneousvalues of RPM instantly adjusting indications to conform to changes of speed.The tachometer enclosure shall be of splash-proof construction. The exteriorsurface shall be of a durable gray or black finish. Means shall beincorporated in the mechanism to prevent damage to
8、 the reed assembly resultingfrom violent vibration of the instrument. Type PR tachometer shall be aportable type for hand use. Type FR tachometer shall be of the fixed orpermanent mounting type for panel or bracket mounting as specified.3.2 Materials.3.2.1 Metals. Unless otherwise specified herein,
9、all metals used in theconstruction of the tachometer shall be corrosion-resistant. Dissimilar metalsshall not be used in close physical contact with each other unless suitablyfinished to prevent electrolytic corrosion.3.2.2 Flammable materials. Materials used in the construction of thetachometer sha
10、ll, in the end configuration, be noncombustible or retardant inthe most hazardous conditions of atmosphere, pressure, and temperature to beexpected in the application. Fire retardant additives may be used providedthey do not adversely effect the specified performance requirements of thebasic materia
11、ls. Fire retardant properties shall not be achieved by use ofnonpermanent additives in the basic material.3.2.3 Fungus resistant materials. Materials used in the construction of thetachometer shall be fungus inert materials.3.3 Physical requirements. The tachometers shall instantaneously andcontinuo
12、usly indicate the speed of rotation in RPM of the rotating part towhich it is connected. The tachometers shall indicate, without change oradjustment, regardless of the direction of rotation of the driving part. Meansshall be incorporated in the mechanism so that compensation for errors to aminimum o
13、f 5 percent may be made without remarking the scale.3.3.1 Windows. The reed assembly shall be protected by a window that is freefrom flaws and defects and does not cause parallax error.3.3.2 Carrying case. Portable tachometers shall be furnished in a carryingcase, arranged to contain the tachometer
14、and all attendant accessories. Thecase shall contain a durable instruction card, permanently secured therein,which shall include all necessary instructions and information for properoperation.3.3.3 Dimensions and weight. Dimensions and weight shall not exceed thefollowing:Type FR Type PRLength 230 m
15、m 180 mmWidth 155 mm 80 mmDepth 130 mm 130 mmWeight (excludingcarrying case)2268 grams 1360 grams3.3.4 Label plates. The unit shall be provided with a data nameplate and aninstruction plate. They shall be attached to the unit, readily visible duringnormal operating use and shall not adversely affect
16、 the life and utility ofthe unit.Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-A-A-5973433.3.4.1 Data nameplate. The data nameplate shall contain the manufacturersname, model, serial number, date manufactured, National Stock Number (ifavailable), a
17、nd any other information needed to uniquely identify the unit.3.3.4.2 Instruction plate. The instruction plate shall provide instructionsfor operation.3.3.5 Mounting bracket. Type FR tachometers shall be furnished with amounting bracket for permanently installing the instrument when specified.3.4 Pe
18、rformance requirements.3.4.1 Accuracy. Accuracy tests shall be conducted on the types FR and PRtachometers at 5C, 25C, and 65C. The accuracy shall be checked at a minimumof five equally spaced operating speeds over the range of the tachometer. Thetachometer shall conform to the following requirement
19、s. (Shipboardrequirement, see 7.3)3.4.1.1 Reed frequency. The peak resonant frequency for each reed shall notvary in excess of the following (Shipboard requirement, see 7.2):a. Plus or minus 0.5 percent from the frequency indicated on thescale at an ambient temperature of 25C, and for the applicable
20、position of operation specified hereinafter.b. Plus or minus 1.0 percent from the frequency indicated on thescale for any ambient temperature over the range of 5C to 65C,for the applicable position of operation as specified hereinafter:(1)Type FR - Within 60 degrees of the normal operating position(
21、2)Type PR - Any position of operation3.4.1.2 Reed frequency interval. At an ambient temperature of 25C, theactual interval between adjacent reeds shall not exceed the normal intervalbetween reeds, plus 0.5 percent of the scale indicated value of either reed.As the speed is varied, reeds shall vibrat
22、e in proper sequence over an ambienttemperature range of 5C to 65C. (Shipboard requirement, see 7.2)3.4.2 Enclosure. The tachometer enclosure shall be splash-proof inaccordance with NEMA 250. (Shipboard requirement, see 7.2)4. REGULATORY REQUIREMENTS4.1 Recovered material. The offeror/contractor is
23、encouraged to userecovered materials to the maximum extent practicable, in accordance withparagraph 23.403 of the Federal Acquisition Regulation (FAR).5. PRODUCT CONFORMANCE PROVISIONS5.1 Product conformance. The products provided shall meet the salientcharacteristics of this Commercial Item Descrip
24、tion, conform to the producersown drawings, specifications, standards, and quality assurance practices, andbe the same product offered for sale in the commercial marketplace, or thesame product that has been delivered to the Government for shipboard use on aprevious procurement. The Government reser
25、ves the right to require proof ofsuch conformance.5.2 Warranty. Special warranty requirements shall be specified in theordering data. Otherwise, the standard commercial warranty applies.Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-A-A-5973446. PAC
26、KAGINGPreservation, packing, and marking shall be as specified in the contract ororder.7. NOTES7.1 Part or identification number (PIN). The following part oridentification numbering procedure is for government purposes and does notconstitute a requirement for the contractor.Example: AA59734-FR-GSpec
27、ification Type RangeAA59734 FR (see 2.1) G (see 2.2)7.2 Ordering data.a. Title, number, and date of this CIDb. Type and quantity requiredc. Range requiredd. Mounting bracket when requirede. Unique packaging and marking requirementsf. Special warranty requirements7.3 Shipboard requirement. Whenever a
28、 “(Shipboard requirement)” is includedin a paragraph under SALIENT CHARACTERISTICS, it is meant that the requirementis something that is not normally offered to the commercial market by themanufacturer.7.4 Sources of documents.7.4.1 ASTM D3951 Standard Practice for Commercial Packaging is availablef
29、rom the American Society for Testing and Materials, 100 Barr Harbor Drive,West Conshohoken, PA 19428-2959.7.4.2 NEMA 250 - Enclosures for Electrical Equipment (1000 Volts Maximum) isavailable from The National Electrical Manufacturers Association, 1300 North17th Street, Suite 1847, Rosslyn, VA 22209
30、.7.5 Potential sources. Based on information available at the time thisdocument was developed, the following companies manufacture products that arebelieved to comply with the salient characteristics of this Commercial ItemDescription.Manufacturers:Avo Biddle Instruments510 Township Line RoadBlue Be
31、ll PA 19422-2701Herman H. Sticht Co. Inc.57 Front StreetBrooklyn, NY 112017.6 Key words.Resonant ReedShipboard UseProvided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-A-A-597345MILITARY INTERESTS: CIVIL AGENCY COORDINATING ACTIVITY:GSA FSSCustodians: Preparing Activity:Navy SH Navy - SHAir Force 99 (Project 6680-0281)Review Activities:Navy ASAir Force 03, 33, 71DLA GS, GS1CIV - NIHProvided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-
