AW Gear Meters FEM-03 - Manual (Page 28)

FEM-03 Flow Monitor
Operation and Programming Manual
27
produce large errors. If the TARGET NBR is too large, the ratio will not be calculated frequently. The
allowable range for TARGET NBR is from 1 to 65534. The recommended typical range for values is from
200 to 2000. Initial value is 500.
ANALOG OUT Programming (FEM-03A, -03A2 and -03Ax only)
The FEM-03A, -03A2 and -03Ax have a 12-bit analog output with programmable span and scaling. The
output span can be configured between 0 to 20mA and 10 to 20mA using the MA OFFSET parameter.
The flow rate or total represented by the maximum output is programmable. When the output is
assigned to FLOW A DR, the mid-point of the output span represents zero flow, with maximum positive
or negative flow producing the maximum or minimum output. For example, with the MA OFFSET
programmed for 4 mA, the output ranges from 4 mA for maximum negative flow to 12 MA for zero flow,
to 20 mA for maximum positive flow. This result can be processed as positive and negative by using
offset compensation that can be accomplished with most data recording devices.
From the ANALOG OUT screen, program the signal assignment, offset, and scaling values for the mA
output. Use the MODE key UP to select the ANALOG OUT 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. The FEM-03 accesses these parameters in order:

MA OFFSET

ANALOG POINT

ENTER VALUE AT MAX Mas
MA OFFSET
The FEM-03 uses this variable to set the lowest value for the mA output span and as a fine offset
adjustment in the field, if necessary. The low range of the output span is between 0 and 10 mA. The
initial value is set to produce 4.00mA at the output for a zero value of the assigned variable.
ANALOG POINT
The FEM-03 uses this variable to “point” to an output assignment for the analog output. The output can
be assigned to represent one of eight possible functions depending on the FEM-03A model:
RATE A GT (#00) TOTAL A (#04)
RATE A PL (#01) TOTAL B (#05)*
RATE B GT (#02)* A B DIFF (#06)** (Rate A-B)
RATE B PL (#03)* RATE A DIR (#07)*
*FEM-03A2 or –03Ax only. **FEM-03A2 or –03Ax Rev. 122 and after only