尤其适用于气冷石墨慢化反应堆的仪表，类型1:具有镁合金包覆的金属天然铀燃料的反应堆，以及类型2:具有不锈钢包覆的浓缩铀氧化物燃料的反应堆。 IEC 60231系列标准不再是最新的，IEC不会对其进行修订。目前保留这些标准是为了参考书目，因为它们过去曾用于仍在运行的核电厂的设计。

Applicable more particularly to instrumentation for gas-cooled graphite-moderated reactors, Type 1: reactors having metallic natural uranium fuel clad with magnesium alloy, and Type 2: reactors having enriched uranium oxide fuel clad with stainless steel. The IEC 60231 series of standards is no longer up-to-date and will not be revised by IEC. The standards are maintained for the time being for bibliographical purposes and because they were used in the past for the design of nuclear power plants which are still in operation.