Hoffer Flow Controls CAT3-AC-MIL User Manual page 22

14 Operation
5.4 Analog Output
CAT3-AC-MIL provides an Analog Output option that will output an
analog current or voltage that is proportional to the flow rate.
Analog Output – AC Power
-
LOAD
1
PCA183
SW1
4–20 mA Output
The Microcontroller, located on PCA183, accepts the square-
wave output of the preamplifier and performs all of the
calculations that are required to control the Loop Driver. After
measuring the frequency of the square-wave, the Microcontroller
uses the following equations to compute the flow rate and current.
flowrate
HP-325
DC+
DC-
SIG+
SIG-
ANLG
PULSE+
PULSE-
+
N/C
N/C
N/C
frequency
=
Kfactor
L1
L2
PLUG AC MALE
NEUTRAL
FM
x 60
HOT
xCF