Application Case Studies

CEMENT KILN SENSOR STANDS UP TO HIGHLY ABRASIVE,
HIGH VIBRATION ENVIRONMENT

Industry: Cement Kiln Manufacture
Application: Measurement of temperature inside a rotating kiln, operating temperature 330°C, and stressed by continuous high vibration. The material being processed is nickel laterite ore, an irregular crushed stone approximately 6" in diameter, with a high moisture content. This material is very abrasive.

Customer Requirement: This application needed a thermocouple assembly rugged enough to measure ore temperature in a very abrasive, high vibration kiln environment..

Conax Design Solution:
A Type K thermocouple made of 8 AWG wire and beaded with two-hole alumina insulators.The 8 AWG Type K thermocouple is placed in a 0.50" Schedule 40 446 SST pipewell to protect the sensing junction. A 3.00" OD x 1.50" ID heat resistant alloy grade HT outer protective pipewell, welded to a 5.25" OD 310 SST flange, houses the 0.50" Schedule 40 446 SST pipewell assembly.The outer grade HT pipewell is coated with a 0.05" thick Nickel/Chrome/Boron coating for the first 3" to provide extra abrasion resistance.

Benefits of Using Conax Sensor:
The Conax design allowed the customer to provide temperature monitoring of the product in an area that was previously thought to be too harsh for a thermocouple. To date, these sensors have been in service more than 36 months without failure.