Wednesday, March 23, 2016

Choose Thermal Dispersion Flow and Level Technology for Your Next Application

thermal dispersion flow and level
Thermal Dispersion flow and level
switches (courtesy of FCI)
Thermal Dispersion flow and level switches are found in continuous operation in the most demanding and critical process and plant applications. This technology is the most preferred solution in oil and gas upstream and downstream applications; wastewater treatment; chemical operations; power plants, including nuclear power; food and beverage; refineries; mining; metals; manufacturing and more. Whether your application is for flow, level, flow + temperature or level + temperature, there is an thermal dispersion flow and level switches are available to meet your needs.

The reasons for their popularity are clear. They were developed from more than 40 years of flow and level switch engineering and application experience to deliver the most reliable, repeatable, rugged and longest life industrial grade switch products found anywhere.

Thermal Dispersion technology uses the principle of measuring the heat loss, or cooling effect, of a fluid flowing across a heated cylinder. A typical flow element configuration uses two RTDs, sheathed in thermowells, separated by a gap. Heat is applied internally to one RTD relative to the other, creating a differential temperature between the two. This differential temperature is greatest at no flow conditions and decreases as flow increases, cooling the heated RTD.

Changes in flow velocity or immersion of the flow element into a liquid directly affect the extent to which heat is dissipated and, in turn the magnitude of the temperature differential between the RTDs. This differential is electronically converted into an electrical signal that can be used to trip a relay in flow or interface switch applications.

Since the relationship between flow rate and cooling effect is directly related to mass in gas applications, Thermal Dispersion technology, combined with advanced signal linearizing circuitry, is used to provide a highly repeatable and accurate measurement of gas or air mass flow rates.

Advantages to Using Thermal Dispersion

  • Precise performance accuracy
  • No moving parts
  • All welded design
  • All 316L stainless steel, Hastelloy, or exotic materials
  • Designed for heavy industrial environments
  • High liquid flow rate sensitivity
  • High temperature service
  • All liquids and gases

Additionally, models are available with 316L stainless steel wetted parts that are electro-polished to 20 Ra, with a sanitary flange process connection meet the sanitary requirements of the food, beverage, pharmaceutical and chemical industries. The instrument’s "no moving parts" design makes it ideal for monitoring the flow of syrups, fillings and other viscous media and product slurries. This design is suitable for both clean-in-place and steam-in-place applications.

For more information about Thermal Dispersion flow and level products, contact:

Flow-Tech, Inc.
10940 Beaver Dam Rd
Hunt Valley, MD 21030
Ph: 410-666-3200

Central VA Office
10993 Richardson Rd#13
Ashland, VA 23005
Ph: 804-752-3450