Sierra FLAT-TRAKTM 780S - Manual (Page 32)

Chapter 3 Operation Series 780S Instruction Manual
3-6 IM-78S-B
K-Factor Adjustment
Entering a K-factor adjusts the meter’s output signal without affect-
ing the factory calibration curve. Use the K-factor calibration offset
for additional flow profile compensation (the factory includes an ini-
tial flow profile correction in the calibration curve of the unit).
Entering a K-factor using 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. Select FUNCTION, enter the password.
Select FUNCTION again until K-factor appears on the display.
2. Use UP or DOWN to enter the desired K-factor value in engi-
neering units.
3. Select 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 K-factor using the Single-Digit LED
A K-factor value of 1.000 VDC means the output value is not af-
fected 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 de-
sired 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.