AW Gear Meters FEM-03 - Manual (Page 16)

FEM-03 Flow Monitor
Operation and Programming Manual
15
Pulse Width Method
This method calculates rate based on the time from pulse edge to pulse edge. It updates more
frequently at high-input frequencies and less frequently with lower-input frequencies, producing stable
display response especially at frequencies below 100 Hz.
Gate Time Method
This method calculates rate based on the number of pulses counted during a prescribed time period.
The Gate Time Method updates at the same rate regardless of the input frequency, and produces the
most stable displays at frequencies above 100 Hz.
The initial mode (PL or GT) is always the default at power up. While in either RATE A or B GT or RATE A
or B PL display mode, use SEL to view or program the other method. Either or both methods can be
displayed as shown below:
RATE A or B
GT
(RATE A or B Gate Time)
The FEM-03 calculates the rate by the gate time method based on the programmed GATE AB variable; it
is displayed based on the corresponding KFR factors, decimal locations and engineering units. To show
RATE A or B PL, press SEL while in the RATE A or B GT display.
RATE A or B
PL
(RATE A or B Pulse Length)
The FEM-03 calculates the rate using the pulse length method and based on the SAMPLE A and SAMPLE
B variables; rate is based on KFR factors, decimal locations and engineering units. Press SEL to show
RATE A or B GT while in the RATE A or B PL display.
(FEM-03A2 and -03Ax only) (FEM-03A2 and -03Ax only)
(FEM-03A2 and -03Ax only) (FEM-03A2 and -03Ax only)