Liquid Controls SCAMP - Manual (Page 19)

19
APPENDIX C: CALCULATING THE K-FACTOR FOR YOUR METER (Cont.)
2. An M5 dispenser meter is to be set to output 250 whole pulses per channel per
gallon in order to count into a dispenser head that requires 1000 edges per gallon.
Initial k-Factor = 4894.8 edges / gallon (nominal) = 19.5792
250 pulses per gallon
Switch setting is dialed to 19582 (1958 with 2 decimal places).
Put function switch in function 0 and enter the value by pressing the Data
Entry pushbutton. The display will scroll “F19.58“.
Once the initial k-Factor is set, a proving run can be made to fine tune the calibration.
Fill the prover to a known level at the desired flow rate (usually the highest flow rate of
the meter/system). Read the pulse count and compare it to the prover volume. If the
two are not equal make the following calculation to adjust the function 0 k-Factor:
New k-Factor = Current k-Factor x Meter volume
Prover volume
Example: A 100 gallon proving is done on the M7 meter in example 1
above. The prover level is read out at 100.15 gallons. The pulse counter
on the SCAMP reads 9987 pulses or 99.87 gallons when the decimal
point is properly positioned.
New k-Factor =
22.22 x 99.87 gallons = 22.1579
100.15 gallons
Switch setting is dialed to 22162 (2216 with 2 decimal places)
Put function switch in function 0 and enter the value by pressing the Data
Entry pushbutton. The display will scroll “F22.16”.
A verification run can be made to check the results of the fine tuning procedure. In the
example above, there may be some small residue error due to rounding the calculated
new k-Factor to a four digit number. This should be less than 0.1% in all cases and can
be reduced by using one or more settings of the multi-point capabilities of the SCAMP.
Using the verification run data, the first of the multi-points can be obtained.
APPENDIX D: NOMINAL RAW PULSER RESOLUTION (100 ppr encoder)
LC Meter
Size
Max Flow
Rate Revs/Gallon Pulse Edges/
Gallon
Pulse Edges/
Litre
P 60 12.237 4894.8 1293.11
M/MA5 60 4.079 1631.6 431.04
M/MA7/10 150 5.555 2222.0 587.01
M/MA15/25 300 2.058 823.2 217.47
M30/40 450 0.742 296.8 78.41
M60/80 800 0.398 159.2 42.06
MS-75 700 0.255 102.0 26.95
MS-120 1200 0.158 63.2 16.70