Flow Measurement; Differential Measurements - Festo DIDACTIC Manual De Instrucciones

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6.7 Flow measurement

For flow measurement, the hydraulic motor is
used in conjunction with a low speed measure-
ment system (flow sensor). By means of the
changeover switch on the flow sensor, it is
possible to change the direction of rotation of
the motor (clockwise and anti-clockwise rota-
tion).
Connect the flow sensor to the measuring de-
vice as shown in the corresponding diagrams:
Key: ON/OFF S
Reading: ---
Battery operated measuring device
Measuring device with external voltage supply

6.8 Differential measurements

By calling up the sensor characteristic line
SE12 or SE14, the two inputs SP1 – SP2 are
formed and displayed. The characteristics of
the inputs can be adapted to the sensors in
programming mode, whereby one sensor must
be connected to the voltage output and one
sensor to the current output.
> > E
SE1 SE2 SE3
Example:
You wish to carry out a differential pressure
measurement using the following pressure sen-
sors:
Pressure range
Output signal
→ characteristic St
→ Offset OFF
(calculation see 6.6)
0.00
Programming of characteristic line for sensor A
(SE12):
Key ON/OFF
Display
Key E
Display
Programming of characteristic line for sensor B
(SE14):
Key ON/OFF
Display
Key <
Display
The programmed characteristic lines can now
be called up in sensor mode (SE12= SP1-SP2,
or SE14= SP2-SP1);
Key ON/OFF
Display -----
Sensor A must be connected to socket SP1+
(10) and SP1- (11) and sensor B to sockets
SP2+ (12) and SP2- (13).
- 18 -
Sensor A Sensor B
0...10 bar 0...10 bar
0...10 V 0...20 mA
= 1 bar/V 0,5 bar/mA
= 0 bar = 0 bar
P > E
--- PRO SE11 SE12 St1.00
Stor----
P > ... >
--- PRO SE11 SE12 SE14
... < E E
0.90 0.50 Off0.00
S > ... >
SE1 SE2
E
Off0.00
E
St1.00
Stor----
E
SE12 Stor---