AW Gear Meters EMO-1005 - Manual (Page 18)

AW-Lake Company 8809 Industrial Drive, Franksville, WI 53126  web: www.awgearmeters.com
 Tel: 262-884-9800  Fax: 262-884-9810  Email: [email protected]
REV. 1a 05/98 EMO-1005 Manual.DOC
17
ANALOG GAIN - KFA (Display 4)
The Analog Gain (KFA) is the scaling between the frequency input and the analog output. This is only
valid in Monitor Mode -- in PID Mode, KFA controls the closed loop reaction time (P21).
This should not be confused with the KFR factor
ANALOG GAIN (KFA)
CURRENT=XXXXXXXX
The formula that describes the relation is as follows :
Frequency when Eng. Unit =Gallons
V * 33400 Imp/gal X GPM
KFA = f =
f 60 sec
where,
V is the desired Output Voltage at frequency f: If 5V - use the GPM realistically achievable by
your system to find f.
- 33400 is a constant
Once the right number is entered press ENT
The default value for KFA=00000167 (1000Hz = 5Volt)
The maximum KFA is 00065000
After the formula has been calculated and the correct number has been programmed in to the KFA, the
Analog Output can be seen by going into the Status Display Mode. The Status Display shows a number
from 0 to 1023 for the Analog Output. This number is the D/A converter input from the
microprocessor. When the EMO-1005 is set for a maximum of 5 Volt DC on the Analog Output (Pin
10) then each step of the converter is equal to:
One step = 5Volt/1024steps = 4.8828mV
Therefore, if 1 Volt is measured on the Analog Output then the Status Display should be showing a
count of 205 in the Analog Out (AO0205) position. (1 Volt = 205steps * 4.8828mV)