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Low Flow Cut-Off
Very small (insignificant) flow values can be suppressed by setting a shutdown threshold.
Measured values below the shutdown threshold have no effect on the output signal, display and
consumption meter.
The minimum shutdown value can be set in m
3.2.2.
Analogue Output
Current Output (OUT 1)
The analogue current output (factory setting 4 - 20 mA or 0 - 20 mA) is used for the actual flow or temperature
measured values. The analogue output is freely configurable and scalable via the display menu or the EE-PCS
Product Configurator Software.
PLEASE NOTE
The analogue output features an error message function according to NAMUR NE43. In the event of a faulty
sensing head, the output signal will freeze at 21 mA.
Switch (Alarm) Outputs (OUT 1 and OUT 2)
The switch outputs can be set via the display menu or via the EE-PCS Product Configurator Software. One can
select between "hysteresis mode" or "window mode" as well as between normally closed (NC) or normally open
(NO) contact.
Switch point
NO (normally
1
open contact)
0
NC (normally
1
closed contact)
0
Fig. 5
Hysteresis mode
Pulse Output (OUT 2) and Consumption Meter
The EE741 flow sensor features an integrated meter with pulse output, which totalizes the consumption of
compressed air or gas.
With the display menu or the EE-PCS Product Configurator Software, the user can set:
▪
Pulse duration: 0.02...2 s
▪
Pulse value: 0.1...1 000 m³
The pulse - pause ratio must be at least 1:2. This means that the time between pulses must be at least twice the
pulse duration.
The minimum time between two pulses is 2 s.
OUT 2
≥ 2 s
1/3
min. 2/3
Fig. 7
Pulse-pause ratio
Nm ³ /h
3
3
/h or ft
/min.
Set point high
Hysteresis
Set point low
t
NO (normally
open contact
NC (normally
closed contact)
Fig. 6
Window mode
t
User Manual EE741
Nm 3 /h
1
)
0
1
0
Inline Flow Sensor for Compressed Air and Gases | 9
Hysteresis
high
Hysteresis
low
t
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