Principle Of Operation; Functional Blocks; Preamplifier - Hoffer Flow Controls CAT1 Series User Manual

3. Principle of Operation

The CAT1 consists of two printed circuit boards and four main
functional blocks: the Preamplifier, Microcontroller, Loop Driver, and
Communications Interface.
FLOWMETER INPUT
4-20 mA
3-1

Functional Blocks

3-1-1

Preamplifier

The Preamplifier, located on PCA180, accepts the input from the
flowmeter.
filtering, and wave-shaping to the input signal. The wave shaping
function converts the signal into a square-wave before sending it
to the Microcontroller.
PCA180
CONDITIONED SIGNAL
PREAMP
The Preamplifier applies amplification, low-pass
Principle of Operation
LOOP
4-20 mA
DRIVER
7
PCA183
MICROCONTROLLER
COMMUNICATIONS
INTERFACE
RS232
HP-310