標準號：IS 8945-1987
發布日期：1988/6/1 12:00:00
實施日期：1999/12/31 12:00:00
適用范圍：1.1 This standard covers requirements and tests for the following direct acting electrical indicating instruments (including multirange instruments ) for use in hazardous atmospheres:a) Ammeters,b) Voltmeters,c) Wattmeters ( single and polyphase ),d) Varmeters,e) Power factor indicators,f) Frequency meters ( pointer and vibratingreed type ), andg) Ohmmeters ( non-ratio type ).1.2 This also applies to electrically measuring equipments provided that electrically measuring indicating instrument (receiver) only is considered, and that the law for translation from non-electri-cal quantity to the electrical one is known.1.3 This standard is applicable to electrical appa-ratus for explosive gas atmospheres where atmos-pheric conditions for the explosion characteristics of the explosive gas atmosphere are considered as having pressures in the range 80 ( 0·8 bar ) to 110 kPa (1·1 bar ) at a temperature in the range - 20 °G to +40oG. Atmospheric conditions outside this range may need special consideration.