Analog Output - Hoffer Flow Controls CAT3 User Manual

14 Installation and Operation

Analog Output

3.4
CAT3 provides an Analog Output option that will output an analog
current or voltage that is proportional to the flow rate.
Analog Output
DC
-
POWER
SUPPLY
-
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-312
+
DC+
DC-
SIG+
SIG-
ANLG
PULSE+
PULSE-
+
N/C
N/C
N/C
frequency

Kfactor
1
PCA183
SW1
1-5 V Output
FM
x 60 xCF
CAT3