AW Gear Meters FEM-03 - Manual (Page 29)

FEM-03 Flow Monitor
Operation and Programming Manual
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The number displayed indicates the current function of the analog output. The initial assignment for the
ANALOG POINT is RATE A
GT (#00). RATE or TOTAL produces an output ranging from the MA OFFSET
value (0-10 mA) for a zero value, to 20 mA for the maximum programmed flow rate or total.
RATE A DIR is only for bi-directional flow-rate and will split the output span in half producing an output
between 10 and 15mA (depending on MA OFFSET) for zero flow. The output increases up to 20mA for
positive flow, and decreases to the MA OFFSET value (0-10 mA) for negative flow based on the
programmed VALUE AT MAX MA’S.
ENTER VALUE AT MAX MA’S
FEM-03 uses this scaling variable to set the maximum mA output (20mA.) to a corresponding rate or
total value, which the user has selected above with ANALOG POINT. If RATE A DIR is selected, this VALUE
represents the flow rate at the maximum and minimum of the mA output span with the mid-span
indicating zero flow. The entries correspond to the KFT or KFR, decimal location, and engineering units
for the source selected with ANALOG POINT. The initial value is 10 HZ.
LIMITS Programming
Program Limits from the LIMIT screen. Assign L1 and L2 to any of the following functions (note
exceptions). Initial assignment is TOTAL A for L1 and L2.
RATE A GT RATE B PL* CYCLE OUT
RATE A PL TOTAL A WARNING/ALARM AB**
RATE B GT* TOTAL B* WARNING/ALARM BA**
*Model FEM–03A2 only. **Model FEM–03Ax only.
Do not assign to these functions unless the FEM-03 model supports the feature, or the limit will not
function properly.
RATE Limits/Limit MARGIN
To operate a limit based on RATE, select a RATE A or RATE B function based on pulse length or gate time
measurement. The MARGIN variable is programmed in engineering units and determines whether the
limit functions as an absolute limit or activates within a margin or “window” around the programmed
RATE limit. When the user programs the MARGIN as zero, the limit activates whenever the selected
RATE equals or exceeds the programmed value. When the user enters a MARGIN value other than zero,
the limit is active whenever the selected RATE is within the “window” of the programmed RATE limit
value plus or minus the MARGIN value.
Caution