KROHNE UFM 500 EN User Manual

Page 49

12.

Block diagrams

12.1

Signal converter UFC 400 ...

Signal converter UFC 400
The UFC 400 consists of four functional groups.

Functional group 1 generates the ultrasonic waves, controls
the sensors and carries out high-precision measurement of the
propagation time.

In functional group 2 the digitized data supplied by

P 01

are evaluated by microprocessor

P 02 in accordance with the

functions, operating and primary head data which are factory
set. With the aid of the KROHNE-developed LSI circuit
(KSA), microprocessor

P 02 controls the outputs that are

galvanically isolated by opto-couplers (functional groups 3
and 4).

The KSA module is also used to feed last counts to the
EEPROM. In the event of a power failure, last counts are
saved in EEPROM 2. In the same way as operating and
functional check data are permanently stored in EEPROM 1,
both are retained for 10 years without auxiliary power.

Functional group 3 converts an output signal into a
proportional current. This group is galvanically isolated from
the other groups.

Functional group 4 consists of power drivers to allow control
of electronic (EMC) or electromechanical (EC) totalizers and
indicators. The group is galvanically isolated from the other
groups. Note that the pulse output and the status output share
the same common.

12.2

Signal converter UFC 500 ...

Signal converter UFC 500
The UFC 500 consists of four functional groups.

Functional group 1 generates the ultrasonic waves, controls
the sensors and carries out high-precision measurement of the
propagation time.

In functional group 2 the digitized data supplied by

P 01

are evaluated by microprocessor

P 02 in accordance with the

functions, operating and primary head data set by way of the
3 keys. With the aid of the KROHNE-developed LSI circuit
(KSA), microprocessor

P 02 controls the outputs that are

galvanically isolated by opto-couplers (functional groups 3
and 4). The last measured value and other information are
forwarded via this circuit to the alphanumeric LCD for
indication.

The KSA module is also used to feed last counts to the
EEPROM. In the event of a power failure, last counts are
saved in EEPROM. In the same way as operating and
functional data are permanently stored in EEPROM 1, both
are retained for 10 years without auxiliary power.

Functional group 3 converts an output signal into a
proportional current. This group is galvanically isolated from
the other groups.

Block diagram UFC 400...

Serial data

Count

Multiplex

and

Transmitt

Sensor

1
2
3
4

KSA

EEPROM

Current
output
0 (4) TO 20
mA

Pulse output

≤

1 kHz

EC/EMC

I+
I
I

Power

Block diagram UFC 500...