AW Gear Meters FEM-03 - Manual (Page 27)

FEM-03 Flow Monitor
Operation and Programming Manual
26

For ratio warning and alarm limits, assign LIMITS to the RATIO function (see LIMITS
Programming on page 28)
To program RATIO, use the MODE key UP to select either the RATIO A/B or RATIO B/A display. Press and
hold the ENT key. The display first shows a P in the lower left-hand corner and then displays the first
program variable for this mode. Four parameters are accessed in order as follows:
RATIO A/B RATIO B/A

IDEAL AB

IDEAL BA

WARNING AB

WARNING BA

ALARM AB

ALARM BA

TARGET NBR

TARGET NBR
IDEAL AB/IDEAL BA
Use these individual variables to set the ideal ratio you wish to achieve for either A/B or B/A ratios. The
allowable range for either ratio is from .001 to 65.534 (the factory recommends programming no
smaller than a 0.010 ratio). The initial value of both IDEAL Ratios is 1.000.
WARNING AB/WARNING BA
The FEM-03 uses these individual variables to set the percent ratio error at which the L1 WARNING limit
activates. The ratio error limits are 1% to 100%. The initial value for either WARNING limit is 5.0 %.
For the RATIO WARNING limit to function, you must assign the L1 LIMIT to the WARNING function. See
LIMITS Programming on page 2812.
ALARM AB/ALARM BA
The FEM-03 uses these individual variables to set the percent ratio error at which the L2 ALARM limit
activates. The ratio error limits are 1% to 100%. The initial value for either ALARM limit is 10.0 %.
For the ratio alarm limit to function, you must assign the L2 LIMIT to the ALARM function. See LIMITS
Programming on page 28.
TARGET NBR
The FEM-03 uses this variable to set the number of pulses it samples before making and programming a
ratio. The FEM-03 uses the TARGET NUMBER for both the RATIO A/B and RATIO B/A calculation. The
device performs a calculation whenever either channel accumulates the TARGET NUMBER since it
calculated the previous ratio. If the TARGET NBR is too small, the ratio calculation can consistently
Notice
Notice