FS10 Series
OPERATION
Fluid Components International LLC
41
Using the K Factors Calculation Window
The K Factors Calculation window provides the means to automatically linearize the FS10’s output signal by entering a reference meter nor-
malized readings corresponding to the same flow rate as the FS10. The interface software computes three sets (1st, 2nd and 3rd order) of K
Factors (linearization coefficients). Choose the set that provides the smallest error and send it to the instrument. This provides the most ideal
FS10 output signal linearization for optimum flow measurement accuracy.
1. After establishing a zero and span using the Customer Flow Range
Setup window, click Calculate K FACTORS.
2. Heed the cautions in the next screen. Click
NEXT
when ready.
3. Enter normalized data in order. Enter 0 and 100% into 1
st
and 5
th
blocks respectively. Values are always in percent of flow.
• FS10 (%)
data are recorded values from HOME window.
• Actual (%)
data are entered values from reference meter at
same flow rate.
Click
Calculate
after all percentage data is entered.
Note:
The FS10 must have the default K Factors loaded before
K Factor calculation can be carried out successfully. An
error dialog will display (
K Factors are not set to their
default values.
) when a calculation is attempted with
existing calculated K Factors in place. After dismissing
the error dialog (twice) the program asks,
Do you want to
set the Kfactors to their default values now?
Click
Yes
to
set the defaults. Alternatively, go to the K Factors screen
(Utilities) and click
RESET DEFAULTS
.
Tip:
Creating a zero offset during initial setup (
Customer Flow
Range Setup
window or through use of buttons) can
significantly improve the linearization of the output range.
For example, instead of scaling between 0 and 10 SCFH (0
to 5000 cc/min), set the zero at 1 or 1.5 SCFH (500 or 750
cc/min). This removes the steepest portion of the output
curve, which improves linearization over the usable range.