其原理是在储存的大量谷物中放置一系列测温探头，探头由刚性管或柔性电缆组成，带有一个或多个温度传感装置，用于检测或监测温度变化。在较大的商店中，可以使用自动温度控制，将各种测量值打印在纸上。第二版取消并取代第一版ISO 4112:1979，其范围已扩大到包括所有散装商店。

The principle is based on placing a series of thermometric probes consisting of a rigid tube or flexible cable with one or more temperature-sensing devices throughout the mass of stored grain to detect or monitor changes in temperature. In larger stores, an automated temperature control may be used, the various measuring values being printed on paper. This second edition cancels and replaces the first edition ISO 4112:1979, of which the scope has been expanded to include all bulk stores.