DLA A-A-54520-1991 THERMOMETER SELF-INDICATING BIMETALLIC《双金属自动指示温度计》.pdf

1、A-A-54520 66 9999974 0062972 0 m z-=- A-A-54520 12 November 1991 COMMERCIAL ITEM DESCRIPTION THERMOMETER, SELF-INDICATING, BIMETALLIC %, The General Services Administration has authorized the use qf this Commercial Item Description in preference to Military Specification MIL-T-3462D which is cancell

2、ed. This Commercial Item Description covers a pocket size dial type thermometer, for use in liquid temperature measurements, inspection of food products, and in determining the temperature of shell eggs. Shall be a self-indicating dial type bimetallic thermometer with a O to 220 degrees Fahrenheit (

3、F) scale range and increments of 2 degrees (FI. The nominal overall length of the thermometer assembly shall be 5-1/2 inches. The thermometer shall be supplied with a carrying case that includes a pocket clip. Shall be designed to indicate temperatures by the rotation action of a bimetallic element

4、which turns a staff that is connected to a pointer. A calibration nut shall provide a means for recalibrating without disassembling the thermometer. Shall be supplied ready for use by being preset to provide thermometer readings that have a +/- 2 degree (FI accuracy. The thermometer shall be tested

5、for accuracy in accordance with the testing procedure indicated in the Quality Assurance Provisions of this document. Shall be designed to respond rapidly to temperature changes. The time for a thermometer reading to rise from 50 degrees to 180 degrees (FI shall not exceed 10 seconds, after the ther

6、mometer is immersed in a 212 degree (FI liquid bath after being transferred from a 32 degree (FI liquid bath. The thermometer shall be tested for speed of response in accordance with the testing procedure indicated in the Quality Assurance Provisions of this document. AMSC N/A FSC 6683 -_- DISTRIBUT

7、ION STATEMENT A: Approved for public release; distribution is unlimited. Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-A- A-54520 Shall consist of a pointed metal stem that is attached to a metal case with a calibration nut. The stem, case, and cal

8、ibration nut shall be fabricated from corrosion-resisting steel. The stem shall be positioned perpendicular to the center of the base of the case. The stem shall house a bimetallic heat-sensitive element. Shall be supplied with a pointed metal stem with an exposed length of 4-3/4 to 5-!/4 inches. Th

9、e out.side diameter of the stem shall be at least 115 inches when measured at - the midpoint. of its axial length. Shall be supplied with a metal case that encloses a graduated dial, a black pointer, and a plrotective window. The window shall be securely sealed to the case to provide a watertight th

10、eimoineter. The dimensions of the case shall aow for at least U 7,s inch diameter field view f the LS! ui-ide-, :hi- window. Shall be suyplied with an pt.ic*aly clear glass ur plastic window. The dial crystal material shall be capable of being subjecit,ed tcl a 225 degree (FI temperature for a one h

11、our period without exhibiting any evidence of discoloration 01% d e f or mat i nn . Shall be supplied with a circular dial with graduations and numerals that are black on a white or silver background. The 0 to 220 degree (FI temperature range shall extend around the circular face to cover at least a

12、 sector formed by a 300 degree arc. A minimum 20 degree arc sector shall separate the positions for the O and 2.20 degree (FI readings. The graduations shall be divided in 2 degree (FI increments with each 10 degree (FI increment longer than the other increments. At least every 20 degree (FI increme

13、nt shall include the appropriate Arabic number marking for a direct temperature reading. The graduation markings shall be permanent and clear. The dial shall also be marked to include the model number and name or registered trademark of the manufacturer or supplier. As an alternate the model number

14、may only be indicated on the printed instructions that are to be supplied with the thermometer. 2 Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-A-A-54520 66 m 9999974 O062973 4 m A-A-54520 Shall be provided with a pointer that is sufficiently dampe

15、ned to provide a temperature reading that does not change more than 2 degrees (FI when the thermometer is subjected to the stability testing pr3ocedure Indicated in the Quality Assurance Provisions of this document. Shall be fitted with a calibration nut that allows the dial adjustments to be made b

16、y using a wrench (not required to be supplied with the thermometer) to grip and turn the nut. Turning the nut shall result in the case and dial being turned and repositioned under the pointer. The calibration nut fitting shall have sufficient friction to require a torque in the range of 15 to 68 inc

17、h-oz to be applied in order to turn the calibration nut. The thermometer shall be tested to determine the tightness of the calibration nut in accordance with the testing procedure in the Quality Assurance Provisions of this document. Shall be supplied with a pocket size carrying case that includes a

18、 pocket clip which is suitably protected against corrosion. The carrying case shall be fabricated from a hard rubber or a rigid plastic. The thermometer, after insertion in the carrying case shall be held in place by a frictional spring clip type support located within the.cavity of the case. The po

19、cket clip-on case shall be designed for alternate use as a handle for the thermometer by allowing the thermometer stem to be inserted into a loop or gap in the pocket clip. Shall be provided with printed instructions, on either a product box or separate enclosure, that indicate the proper use and ca

20、re of the thermometer. A cautionary statement shall be included that indicates that the thermometer is being supplied to be accurate within 2 degrees (FI, unless damaged by shock or temperature extremes, but can be adjusted to a 1 degree (FI accuracy at any point on the dial scale by carefully recal

21、ibrating at that specific temperature. The cautionary statement may be supplied on an insert that is separate from the other instructions. _-_- WorkmanshiE, The thermometer and carrying case shall be free from defects which detract from their appearance or impair their serviceability. Unit. - Each (

22、EA). One thermometer, as specified, constitutes one unit. 3 Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-g ci- A-A-54520 bb - 9999974 0062974 b - A-A-54520 - Responsibilitx _-_-_ _- for inspection. Unless otherwise specified in the contract or pur

23、chase order, the contractor is responsible for the performance of all inspection requirements as specified herein. Except as otherwise specified in the contract or purchase order, the contractor may use his own or any facilities suitable for the performance of the inspection requirements specified h

24、erein, unless disapproved by the Government. The Government reserves the right to perform any of the inspections set forth in the specification where such inspections are deemed necessary to assure supplies and services conform to prescribed requirements. Rg!gygg, Records of examinations and tests p

25、erformed by or for the contractor shall be maintained by the contractor and made available to the Government upon the Governments request, at any time, or from time to time, during the performance of the contract and for a period of three years after delivery of the supplies to which such records re

26、late. - InsEection. - Inspection, as used herein, is defined as both examination (such as visual or auditory investigation without the use of special laboratory appliances or procedures) and testing (determination by technical means of physical and chemical properties) of the item. Tints. Tests shal

27、l be conducted in accordance with commercial practice to determine compliance with the specification requirements. Sampling for the tests shall be in accordance with commercial practice. Additional testing shall be conducted in accordance with procedures hereinafter indicated, to determine complianc

28、e with the specification requirements. Where feasible, the same sample may be used for the determination of two or more test characteristics. The unit of product for sampling shall be the individual thermometer. - Accuracx - testing-, The thermometer shall be tested against a standard thermometer at

29、 32 degrees (FI and at two additional temperature points. The calibration of the standard thermometer shall be traceable to the National Institute of Standards and Technology (NIST). There shall be at least a 50 degree (FI difference between the middle temperature and each of the other two temperatu

30、re points. Sampling for the accuracy testing shall be in accordance with MIL-STD-105 and an 5-3 inspection level. The rejection number shall be two (2). Any thermometer that does not provide all temperature readings within +i- 2 degrees of the standard thermometer readings shall be cause for re j ec

31、t ion. 4 , Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-A-A-54520 66 9999974 O062975 2. A-A-54520 speed -_-_-_ of thermometer resgonse. _- The stem of the thermometer at room temperature shall be immersed in a liquid bath having a 32 degree (FI te

32、mperature. After the thermometer dial registers 32 degrees (FI, the thermometer shall be removed from the liquid bath and immediately immersed in a liquid bath having a 212 degree (F) temperature. The time for the dial to reach 1-80 degrees (F) from the 50 degree (FI reading shall be determined and

33、recorded. Sampling for the testing shall be in accordance with MIL-STD-105 and an S-1 inspection level. The rejection number shall be two(2). Any thermometer whose time response exceeds 10 seconds shall be cause for rejection. e Stability of temgerature readl-g, The thermometer stem shall be immerse

34、d in a liquid bath having a temperature within a range of 2 to 200 degrees (FI. The thermometer dial reading of the bath shall be recorded after the dial setting has stabilized for at least two minutes. The thermometer shall be removed from the bath and then subjected to vibration in accordance with

35、 the f o1 lowing: The thermometer is mounted so that its dial is either normal or parallel to the direction of vibration. The thermometer is subjected to two one hour vibration cycles (two hours total vibration time). Each cycle shall consist of the vibration frequency being progressively increased

36、from 500 to 3000 cycles per minute during the first half hour and then progressively decreased back to 500 cycles per minute during the next half hour. -0 After the thermometer has completed its two cycles of vibration, it shall again be immersed in a liquid bath having the same temperature as that

37、obtained for the initial reading. The thermometer dial reading of the water bath shall be recorded after the dial setting has stabilized for at least two minutes. Sampling for the testing shall be in accordance with MIL-STD-105 and an S-1 inspection level. The rejection number shall be two (2) . Any

38、 thermometer whose temperature reading changes from its original reading by more than 2 degrees shall be cause for rejection - Tightness of calibration nut: The thermometer calibration nut shall be subjected to a torque test to determine the externally applied force that is necessary to turn the cal

39、ibration nut that controls the dial setting. The thermometer shall be held in a rigid position with the dial housing prevented from turning. The torque necessary to turn the calibration nut shall be determined by one of the following methods: 5 Provided by IHSNot for ResaleNo reproduction or network

40、ing permitted without license from IHS-,-,-4. -. A-A-54520 66 W 9999974 0062976 T = A-A- 54520 Using a calibrated torque wrench. Applying a series of weights to the free end of a wrench that is attached to the calibration nut of the thermometer while both the thermometer stem and wrench are in horiz

41、ontal positions. Weights are increased until the calibration nut turns. The torque that is necessary to turn the calibration nut shall be determined by calculation as being the product of the total of the applied weights and perpendicular distance between the line of force and the axis of rotation.

42、Sampling for the testing shall be in accordance with MIL-STD-105 and an S-4 inspection level. The rejection number shall be two(2). Any thermometer whose turning torque is not within a 15.0 to 68.0 inch-oz range shall be cause for rejection. Metric-productgl Products manufactured to metric dimension

43、s will be considered on an equal basis with those manufactured using inch-pound units, providing they fall within the tolerances specified using conversion tables contained in the latest revision of Federal Standard 376, and all other requirements of this document are met. If a product is manufactur

44、ed to metric dimensions and those dimensions exceed the tolerances specified in the inch/pound units, a requet should be made to the contracting officer to determine if the product is acceptable. The contracting officer has the option of accepting or rejecting the product. _- Contractor certificatio

45、n. The contractor shall certify that the product offered meets the salient characteristics of this description and conforms to the producers own drawings, specifications, standards, and quality assurance practices. The Government reserves the right to require proof of such conformance prior to first

46、 delivery and thereafter as may be otherwise provided for under the provisions of the contract. _-_-_- Federal Food,-gryg and-Cgsgg4ic AC If the product covered by this document has been determined by the U.S. Food and Drug Administration to be under its jurisdiction, the offeror/contractor shall co

47、mply, and be responsible for compliance by its subcontractors/suppliers, with the requirements of the Federal Food, Drug and Cosmetic Act, as amended, and regulations promulgated thereunder. In addition, the offeror/contractor shall comply, and be responsible for compliance by its subcontractors/sup

48、pliers, with the requirements of all other applicable Federal, State, and local statutes, ordinances and regulations. 6 Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-A-A-54520 bb 9999974 0062977 I A-A-54520 Recovereg materials. The offeror/contract

49、or is encouraged to use recovered material in accordance with Federal Acquisition Regulation Subpart 23.4 to the maximum extent practical. Y e Preieraton,_Eankag,-ak,-aeng,-a-akn, Unless otherwise specified, preservation, packaging, and packing shall be to a degree of protection to preclude damage to containers and/or co