By Gary Freeman, ABB Measurement Products
Non-contacting temperature measurement techniques for the processing industries complement thermocouple and RTD sensors. Innovations in infrared technology are reducing their cost and size while increasing reliability. Non-contacting temperature measurements offer several advantages. Read more to find out what they are.
In late 1988 and early 1989, two of the four high-pressure feed water heaters at each of the three generating units at the Tennessee Valley Authority's (TVA) Thomas H. Allen Fossil Plant were replaced. In the Fall of 1997, after 8 1/2 years of service, a significant number of tubes failed suddenly in the two Allen Unit 3 replacement heaters. Within a 14-month period, one of the Unit 3 replacement heaters had 97 tube failures and the other had 171 failures. The mode of these tube failures was determined to be stress corrosion cracking (SCC) initiated at a tube roll transition located within the tube sheet.
Only two liters of reagent are required for the analyzer to perform unattended for up to 90 days, twice as long as the Series 5000. The industry's only pressurized reagent delivery system eliminates the frequent maintenance associated with pumps. Predictive diagnostic tools, including Hach's proprietary Prognosys technology, warning LEDs, and high-visibility notification screens let you avoid unplanned downtime.