ProMinent DulcoFlow DFMa, Operating Instructions Manual, Page: 34 / 80

The ‘pulse width’ menu lets you set whether the DulcoFlow ® allows ‘Pulse width’ - ‘variable’ or
works with ‘Pulse width’ - ‘constant’ (frequency signal) - with a pre-set value. That may be required
if the pulses emitted are too short for your connected device (PLC, ...).
Moreover, f = 10 Hz plays a role:
A
-
‘Pulse width’ - ‘variable’
A.1 - f greater than 10 Hz
A.2 - f less than 10 Hz
B
-
‘Pulse width’ - ‘constant’
B.1 - “Normal mode”
B.2 - “Operation with fault behaviour”
A
‘Pulse width’ - ‘variable’
A.1 - f greater than 10 Hz:
The following applies:
f = K * Q
with
Frequency f in Hz
K factor K in 1/ml or pulse/ml
Flow Q in ml/s
P_DFI_0019_SW
Q
0
1
t [s]
1 s 1 s 1 s 1 s
V
1
f
2
f
3
f
1
V
2
V
3
Fig. 15: Appearance of the pulse sequence depending on the flow Q
Set up
34