1、UDC 389 : 531.717.35.085 DEUTSCHE NORM June 1986 d f 0.2 I n cl i nat i o n meas u ri ng systems Cylindrical spirit level vials Dimensions and requirements 6 12 DIN 2276 Part 1 NeigungsmeReinrichtungen; Rohrenlibellen; Mae, Anforderungen Supersedes September 1959 edition. In keeping with current pra
2、ctice in standards published by the International Organization for Standardization (ISO), a comma has been used throughout as the decimal marker. 1 Scope and field of application This standard applies to cylindrical spirit level vials with scales marked to give scale intervals from 0.01 to 5 mm/m or
3、 from 2“ to 20. 2 Concepts For basic metrological concepts and for concepts used in dimensional metrology, please refer to DIN 1319 Part 1, DIN 1319 Part 2, DIN 1319 Part 3, and DIN 2257 Part 1. 2.1 Cylindrical spirit level vial Cylindrical spirit level vials are measuring devices that are partially
4、 filled with liquid and utilize the force of gravity to indicate, via the movement of the enclosed air bubble, inclinations from the horizontal. They are mounted as the measuring component in, for example, inclination measuring instruments, balances, or processing equipment. 3 Dimensions, designatio
5、n Type B Interrupted scale with not less than 4 scale marks Type c Type A placed symmetrically Scale consists of 2 zero Continuous scale around each zero mark marks only 1 4 Figure 1. Types of cylindrical spirit level vials I I 25 I 8o I Other diameters and lengths Cylindrical spirit level vial DIN
6、2276 - A 20 M - 5 Numerical value of scale interval 1) Unit of scale interval (M = pm/m, S = second of arc) Number of scale marks lying outside the zero mark at either end (not applicable in the case of type C) In the case of type C spirit level vials, the maximum angle of tilt at which the bubble s
7、till lies within the zero marks at 20C shall be indicated here instead of the scale interval. Continued on page 2 DIN 2276 Part 1 Engi. Price group 5 Sales No. 0105 Beuth Verlag GmbH. Berlin. has the exclusive right of sale for German Standards (DIN-Normen) 05.87 Page 2 DIN 2276 Part 1 4 Metrologica
8、l requirements 4.1 Scale The scale shall be marked symmetrically in relation to the zero position. Scales of type A and type B vials shall have uniform scale divisions, the distance between two consecutive scale marks being 2 mm. The two zero marks shall be separated by a distance at least equal to,
9、 and not more than 2 mm greater than, the length of the bubble. All scale marks shall be at right angles to the longitudinal axis and of uniform length and thickness throughout. Their thickness shall not exceed 20% of the scale spacing. The zero marks shall be longer than the other marks, and all ma
10、rks shall be permanent, opaque, and have sharply defined edges. 4.2 Limits of error A limit of error of 5 pm/m shall apply for cylindrical spirit level vials with scale intervals up to 25 pm/m or 5“. A limit of error of 20% of the scale interval concerned shall apply for cylindrical spirit level via
11、ls with scale intervals greater than 25 pm/m or 5“. 4.3 Response time The response time shall not exceed the valueE, obtained from the following equation. 400 E, = +8 Scale interval E, is obtained in seconds of time; the scale interval is to be entered in the equation as pm/m. 4.4 Working temperatur
12、e range The requirements specified in subclauses 4.1 to 4.3 shall be met at the working temperature of (20 2 5) “C. 4.5 Storage temperature range Cylindrical spirit level vials shall not be destroyed by the effects of temperature in the range from - 40 to +70C. 5 Material 5.1 Vial The vial shall be
13、made of a transparent material that is free from stress and also free from striae, flaws, and any other impurities which might impair its function. The material shall not be reacted upon by the filling liquid. If glass is used, then this shall conform to a hydrolytic class not greater than 3 as spec
14、ified in DIN 12 11 1. 5.2 Filling liquid The filling liquid shall not decompose when used within the given parameters. It shall contain no water and be free from significant impurities. 6 Marking The scale interval of a cylindrical spirit level vial shall be marked on it. Where the indication refers
15、 to pm/m or mm/m, the unit may be omitted. 1) Standards referred to DIN 1319 Part 1 DIN 1319 Part 2 DIN 1319 Part 3 DIN 2257 Part 1 DIN 12111 Basic concepts in metrology; general basic concepts Basic concepts in metrology; terminology relating to the use of measuring instruments Basic concepts in me
16、trology; terminology relating to the uncertainty of measurement and the assessment of measuring instruments and measuring equipment Terminology used in dimensional metrology; units, activities, checking instruments, metrological concepts Testing of glass; grain method of determining the hydrolytic r
17、esistance of glass as a material at 98 OC and classification of glass into hydrolytic classes Previous editions DIN 2276: 09.59. Amendments The following amendments have been made in comparison with the September 1959 edition: a) the field of application has been altered with regard to the scale int
18、ervals by the inclusion of lower values and the b) a symmetrical arrangement of the scale marks around each of the two zero marks has been specified for type B spirit c) a maximum response time has been specified; d) the standard designation has been introduced; e) marking has been introduced; f) the text has been revised editorially. International Patent Classification G O1 C 9/24 G O1 C 9/34 specification of an upper limit; levels; 1) See page 1
