Sentry AutoVREL Flow Controller

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The Sentry AutoVREL Flow Controller allows users to automate new or existing sample panels through a well-appointed device that controls sample panel flow based on feedback from a non-contact flow meter. With the AutoVREL “smart” function, the operator only needs to set the desired sample flow and the system automatically adjusts to changes in the sample pressure.

Power plants that frequently cycle or have sliding pressures require technicians to manually adjust the variable pressure-reducing element (Sentry VREL) in their sample panels to maintain flow and EPRI-recommended sample velocity. With reduced staff resources, there is increased interest in automating these tasks.

The Sentry AutoVREL flow controller has been developed to meet this need as an entry-level flow controller used in new or retrofit installations within the United States. A Sentry Sample II is recommended for international customers.

The Sentry AutoVREL flow controller is a sister product to the full-featured Sentry Sample Sentry II which offers advanced control and monitoring features.


  • Provides quick response time during system startup
  • Can be field installed on existing sample panels
  • Simple to set and maintain desired flow
  • Displays current valve position
  • Provides feedback to plant DCS via relay
  • Can be set to display actual flow and set flow
  • Allows for manual operation through simple override
More Information
Enclosure Rating IP 65
Input Power 24V DC
Flow Range 200-1500cc/min ± 100cc/min
Inputs Flow, Sentry TSV Trip
Sample Temperature 60°F to 95°F (15°C to 35°C)
Ambient Temperature -4°F to 140°F (-20°C to 60°C)
Wetted Materials 316 SS
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