IS 2419-1979

标准号：IS 2419-1979
发布日期：1979/8/1 12:00:00
实施日期：1999/12/31 12:00:00
适用范围：1.1 This standard lays down a system of dimensions for electrical and electrically operated indicating measuring instruments of the panel type.Note 1 — Dimensions of recording instruments are under consideration.Note 2 —This system of standardization is intended to limit number of sizes, but not to restrict future technical change. Therefore in the future, some sizes may be deleted, if it is found that they are not used in current practice. On the other hand, other sizes may be added provided that they are in accordance with this modular system.1.1.1 It applies to the following types of instruments with protruding flanges:a) Square indicating instruments with round housing,b) Rectangular indicating instruments with round housing,c) Square indicating instruments with square housing,d) Rectangular indicating instruments with rectangular housing, ande) Round indicating instruments with round housing.1.1.2 It also applies to rectangular indicating instruments with rectangular housing without continuous flange.1.2 For the present, forward and backward projections of instruments are not within the scope of this standard.Note 1 — The depth behind the panel is particularly important when constructing instruments, racks and cabinets.Note 2 — Instruments may be mounted in different ways: either individually on the panel using bolts or other fixing devices, the housing of the instrument fitting into the cut-out; or collectively in a common cut-out ( for example, ' shelf mounting' ).