Page 301 - Bürkert

Main features

8012 with optical (standard) or magnetic (on request) principle

Version with Transistor output
8012 Transistor output: NPN (standard) or PNP (on request) operation

With one configured transistor output mode (4 possibilities)
Raw frequency (standard) - (2 pulses per paddle wheel rotation) Raw frequency Pulses
Pulse length:
- 50% ON Paddle-wheel
- 50% OFF 1 2 3 4 rotation
Proportional frequency (on request) - (e.g. 5 pulses per litre) Proportional Pulses
frequency
Pulse length:
- 50% ON Dose
- 50% OFF 1 2 quantity
Switching mode Hysteresis operation Contact Hysteresis, Contact Hysteresis,
- 2 switching modes for the output, either hysteresis or window, NPN On not inverted On inverted
inverted or not, depending on transistor output version wiring
Off Off
Low High Low High
- Configurable delay before switching
Contact Hysteresis, Contact Hysteresis,
not inverted
inverted
PNP On On
wiring
Off Off
Low High Low High
Window operation Contact Window, Contact Window,
NPN On not inverted On inverted
wiring
Off Off
Low High Low High
Window,
Contact not inverted Contact Window,
inverted
PNP On On
wiring
Off Off
Low High Low High
Detection of flow direction - only with optical principle

Version with Transistor and current outputs
Transistor output:
Same features described as above

Current output:
with sinking (standard) or sourcing (on request) wiring
8012 with configurable current output Paddle-wheel frequency mA
and Q = f/K
4 - 20 mA current corresponding to paddle wheel frequency where Q: flow rate [l/s] 20
f: frequency [Hz]
(0 - 250 Hz) - (standard) K: K-factor [pulse/litre] 4
0 250 f (Hz)
4 - 20 mA current corresponding to a flow range - (on request) Flow range mA
20
4 Flow
0 10 800 (l/min.,
for example)
Damping of fluctuation of current output through filter function
Generation of an alarm current (22 mA) - when fluid circulation is opposite to the direction indicated by the arrow on the side of the housing
(only versions with optical principle) or when full scale has been exceeded (versions with optical or magnetic principle)

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