FastFlo™ 620S Instruction Manual
Chapter 3 Operation
IM-62S
3-5
K-Factor Adjustment
Entering a K-factor adjusts the meter’s output signal without affecting the
factory calibration curve. Use the K-factor calibration offset for
additional
flow profile compensation (the factory includes an initial flow profile cor-
rection in the calibration curve of the unit).
Entering a K-factor with the LCD Display
A K-factor value of 1.000 means the output value is not affected and is
the factory default setting. You may enter any number from 0.500 to
5.000.
1. Select the desired range. Press FUNCTION, enter the password.
Press FUNCTION until
K-factor
appears on the display.
2. Use the UP or DOWN arrow keys to enter the desired K-factor value
in engineering units.
3. Press FUNCTION to advance to the next option, or after 12 seconds
of non-activity the meter returns to the Run Mode and the new K-
factor is in effect.
Entering a K-factor without the LCD Display
A K-factor value of 1.000 VDC means the output value is not affected
and is the factory default setting. You may enter any value from 0.500 to
5.000 VDC in Step 3 below. If the device indicated output is 3.0 VDC
and you know it should be 3.8 VDC then you could “force” the output to
the desired 3.8 VDC by adjusting the K-factor to indicate 1.27 VDC (1.27
= 3.8/3.0). Use this formula to determine the desired K-factor voltage:
VOLTS = DESIRED/ INDICATED
1. Set the DVM to voltage mode and connect between Vout+ and
Vout– on the flow meter terminal block.
2. Select the desired range. Press the FUNCTION button until a solid
“7” appears on the LED.
3. Adjust the UP or DOWN button until the DVM indicates the desired
K-factor value as described above.
4. Press FUNCTION to advance to the next option, or after 12 seconds
of non-activity the meter returns to the Run Mode and the new K-
factor is in effect.
Caution!
The flow meter must
not be reporting or
measuring gas flow
during adjustments.
