THERMOWELL. ITS FUNCTION IS TO BECOME PART OF A THERMOMETER ASSEMBLY. THE UNIT CONSISTS OF A METAL TUBE INSIDE ANOTHER METAL TUBE AND MAY BE STRAIGHT OR ELBOW SHAPED. THE TEMPERATURE SENSOR IS PLACED IN THE THERMOWELL WHILE IT IS ATTACHED TO A PROCESS OR TAKEN OUT FROM A MANUFACTURING PROCESS WITHOUT DISRUPTION TO THE PROCESS. THE THEROMWELL HAS NO OTHER FUNCTION THAN TO ALLOW THE THERMOMETER TO BE PLACED IN IT AND TO MAINTAIN THE INTERGRITY OF A MANUFACTUIRING PROCESS. IT IS USUALLY USED ON PIPES SMALLER THAN 4 INCHES IN DIAMETER. IT IS NORMALLY MADE FROM STAINLESS STEEL 316 IN VARIOUS GRADES AND SIZES WITH A VARIETY OF PROCESS CONNECTIONS - WELD THREAD OR CLAMP.

GIR 1&6 NOTE 2(b) TO CHAPTER 90 CN 9025 90 00 90