Hoffer Flow Controls CAT1 Series, Руководство пользователя

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Principle of Operation 7
HP-310
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.
4-20 mA 4-20 mA
RS232
PCA180
FLOWMETER INPUT PREAMP
MICROCONTROLLER
LOOP
DRIVER
CONDITIONED SIGNAL
COMMUNICATIONS
INTERFACE
PCA183
3-1 Functional Blocks
3-1-1 Preamplifier
The Preamplifier, located on PCA180, accepts the input from the
flowmeter. The Preamplifier applies amplification, low-pass
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.