Thermal gradients

Thermal gradients between the AM16/32B measurement terminals and COM terminals can cause errors in thermocouple readings. For example, with type T thermocouples, a one-degree gradient between the input terminals and the COM terminals will result in an approximate one-degree measurement error. Installing the aluminum cover plate (AM16/32B aluminum cover plate) helps to minimize gradients. For best results, the AM16/32B should be shielded and insulated from all radiant- and conducted-thermal sources. When an enclosure is used, gradients resulting from heat conducted along the thermocouple wire can be minimized by coiling some wire inside the enclosure. This technique allows heat to largely dissipate before it reaches the terminals. If the AM16/32B is housed in a field enclosure, the enclosure should be shielded from solar radiation.