Thermal Differential Flow Switch

General Instructions
-100° to 392°F, -70° to 200°C
1 Year
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The model T21 point flow switch uses a thermal differential technique to measure liquid or gas flow, level or interface by sensing changes in the thermal heat transfer characteristics of the media where it is located. The sensor consists of a pair of matched Resistance Temperature Detectors (RTDs) encased in twin 316 series stainless steel tubes. One RTD is self-heated by a constant DC current while the other is unheated, in contact with the liquid and provides an accurate ambient process temperature. It is adjustable to a specific flow rate.

The T21 is a popular choice for low-flow alarm switching, monitoring lube oil on bearings and gears in rolling mills and monitoring the flow of cooling water on pump seals.

  • Wide operating process flow ranges of -100°F to 392°F
  • Removable, plug-in electronics board
  • Self-heating sensor design
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SOR offers many special services in support of our Original Equipment Manufacturers and other large volume customers. Examples include special naming, exclusive nameplates, discriminative labels and even distinctive model numbers or designators. SOR will support and accept orders for the Representative’s special M3Y promoted products. If the customers select this program, SOR will provide M3Y labeled units so that the Representative will know who purchased the products and the Representative can provide exceptional after sales service.