21000铝外壳和24701不锈钢外壳均可用于本质安全的应用场合。这两款外壳都被认证为CSA 4类外壳，并且都*符合美国石油学会 (API)外部安装电涡流探头外壳的API 670标准要求。 套管长度的确定取决于探头和外壳安装的位置。探头引线必须比套管长。

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