Thermal Dispersion Flow Switches

FSW-7112 Thermal Dispersion Flow Switches

The Omega FSW-6000/7000 Series line of Thermal Dispersion Flow Switches is based on the principle of thermal dispersion. A typical configuration uses two platinum Resistance Temperature Detectors (RTD’s) set within the tip of the sensor. One RTD is heated a few degrees above the temperature of the medium and the other RTD is used as a reference, sensing the actual process temperature. The second RTD also monitors the temperature of the medium, as any changes in temperature must be compensated for in the first RTD. As the process medium flows over the tip of the sensor it disperses some of theheat from the first RTD. The temperature change between the two RTD’s signals the probe’s electronics and the switch changes state once the set point has reached.

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 Features

  • Simple to Install and Low Cost
  • No Moving Parts-Maintenance Free Reliability
  • Optimal Temperature Compensation — Unaffected by Temperature Gradient
  • Can Operate in Temperatures up to 120°C (248°F) with Sanitary Option

Applications

  • Hot Water Heating Systems
  • Domestic Water Boosters
  • Process Work
  • Hydronic Heating & Cooling
  • Chillers
  • Low Mass Boilers

Specification

  • Accuracy: ±10% of setpoint
  • Repeatability: ±1% of setpoint
  • Power Supply:
  •     FSW-6000: 85 to 240 Vac (50/60 Hz)
  •     FSW-7000: 24 Vdc ±10%
  • Temperature Range:
  •     Process: -20 to 80°C (-4 to 176°F) [sanitary option to 120°C (248°F) for CIP]
  •     Operating: -20 to 60°C (-4 to 140°F)
  • Max Pressure: 300 bar (4351 psi)
  • Protection Class: NEMA 4 (IP65)
  • Wetted Materials: 316 SS
  • Enclosure Material: Glass filled nylon standard or aluminum die cast option
  • Process Connection: ½ to 1½ NPT, Tri-Grip™, or flange (others available, consult Flow Engineering Department)
  • Output: 250 Vac SPDT 5 A relay
  • Switch Point Adjustment: Potentiometer
  • Bargraph:
  •     Green LED: Flow rate above setpoint
  •     Yellow LED: Flow is at above setpoint
  •     Red LED: Flow is below setpoint
  • Switch Point Status:
  •     Red LED: No flow
  •     Green LED: Flow
  • Response Time: 1 to 10 seconds
  • Max Start up Delay: 12 seconds
  • Switching Range: 3 cm/s to 3 m/s (0.09 to 9.84 ft/sec) (liquid), 5 cm/sec to 15 m/sec (0.16 to 49 ft/sec) (gas)
  • Dimensions:
  •     Nylon Head: 88 Dia x 80 mm H (3.5 x 2.5′ H)
  •     Aluminum Head: 88 Dia x 108 mm H (3.5 x 4.25′)
  •     Insertion Length: 13⁄8, 2 and 3′ standard, for other lengths consult Flow Engineering
  •      Maximum insertion Length is 36′
  •     Weight: Approx 680 g (1.5 lb)

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