Burkert Type 8012 - Manual (Page 10)

10
Generalinformation
Type 8012
5.2.3. Version with pulse output and
current output
pulse output
The characteristics of the pulse output are identical to those on a
version with pulse output only. See chap. 5.2.2.
current output
The current output on the basic versions is connected in sink mode
and delivers a current I, an image of the rotation frequency f of the
paddle-wheel:
I = 8f/125 + 4
As f = KQ, the flow Q is therefore proportional to this current:
mA
0
20
4
Q
Q = (I - 4)
125
8K
Flow rate
Q: flow rate [litre/s]
K: K factor [pulse/litre]
l: current [mA]
current attenuation variations
When the flow varies quickly, the current output signal from your
device can be stabilised. On the basic versions, the current variations
are slightly attenuated.
Generation of an alarm current (versions with optical sensor
only)
On the basic versions, an "alarm" current of 22 mA is generated when
the circulation direction of the fluid is the opposite of the direction of
the arrow on the side of the housing.
Table 2 : Current output data
characteristic possible configurations (on
request) configuration
on a basic
version
Wiring • source
• or sink sink
Current output
range and asso-
ciated measuring
range • 4-20 mA, corresponding to
the rotation frequency range
0-250 Hz of the paddle-wheel
(see above)
• or 4-20 mA, corresponding to a
flow range, in the unit specific to
the application (see chap. 9.3.1)
• or 4-21.6 mA, corresponding
to the rotation frequency range
0-275 Hz of the paddle-wheel
(see chap. 9.3.1)
• or 4-21,6 mA, corresponding
to a flow range, in the unit
specific to the application (see
chap. 9.3.2)
4-20 mA, cor-
responding to
the 0-250 Hz
rotation
frequency
range of the
paddle-wheel
Current atte-
nuation variations Ten possible attenuation levels:
ranging from "no attenuation" to
"maximum attenuation" (see chap.
9.3.3) Slight atte-
nuation of
the current
variations
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