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6
VFS flow sensor
■ Vortex flow sensor for liquid media.
■ Measures flow rate and temperature for BTU metering
(energy balance, etc.)
■ Zero wear (no moving parts).
Figure 6-1 VFS 1-12 flow ouput signal
VFS 1-12 output signal flow
Assignment of measurement range: 0.26-3.17 gpm is equal to 0.5-3.5V
Flow rate calculation: Q = 0.26gpm +[(U-0.5)V/3V]*2.91gpm
Figure 6-2 VFS 1-12 temperature output signal
VFS 1-12 output signal temperature
Assignment of measurement range: 32-212° F is equal to 0.5-3.5V
Temperature rate calculation: T =32° F + [(U-0.5)V/3V]*180°
Figure 6-3 VFS 2-40 flow output signal
VFS 2-40 output signal flow
Assignment of measurement range: 0.53-10.6gpm is equal to 0.5-3.5V
Flow rate calculation: Q = 0.53gpm +[(U-0.5)V/3V]*10gpm
Figure 6-4 VFS 2-40 temperature output signal
Figure 6-5 VFS flow sensor
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SL-PS Installation & Operation Manual
VFS 2-40 output signal temperature
Assignment of measurement range: 32-212° F is equal to 0.5-3.5V
Temperature rate calculation: T =32° F + [(U-0.5)V/3 V]*180° F
Pin Configuration
Temperature signal (0.5 to 3.5 relative to pin 3)
Flow pressure signal (0.5 to 3.5 relative to pin 3)
GND (UV)
Voltage Supply (+5 VDC) PELV
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