Lochinvar SPS0250, SPS0500, PS1000 operation manual VFS flow sensor, VFS 1-12 output signal flow

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 6-1VFS 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 6-2VFS 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° F

SL-PS Installation & Operation Manual

Figure 6-4VFS 2-40 temperature output signal

VFS 2-40 output signal temperature

Assignment of measurement range: 32-212° F is equal to0.5-3.5V

Temperature rate calculation: T =32° F + [(U-0.5)V/3 V]*180° F

Figure 6-5VFS flow sensor

Item Pin Configuration

1Temperature signal (0.5 to 3.5 relative to pin 3)

2Flow pressure signal (0.5 to 3.5 relative to pin 3)

3	GND (UV)
4	Voltage Supply (+5 VDC) PELV

Figure 6-3VFS 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

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