English (GB)
51
The assignment between the current signal and
flow rate is linear.
•
With 0-20 mA current signal control, the curve for
current input and current output passes through
Q = 0 at 0 mA and the value pair Q
max.
(Q
cal
) at
20 mA (curve 1a).
•
With 4-20 mA current signal control, the curve for
current input and current output passes through
Q = 0 at 4 mA and the value pair Q
max.
(Q
cal
) at
20 mA (curve 2a).
•
With manual or contact control, the curve for
current output passes through Q = 0 at 4 mA and
the value pair Q
max.
(Q
cal
) at 20 mA (curve 2a).
The default setting for Q
max.
is the maximum dosing
flow at default calibration at 3 bar.
Fig. 50
Current input and current output with default setting
TM
03
6
606
45
06
0 mA
4 mA
8 mA
12 mA
16 mA
20 mA
0
I
in
[mA]
Q [l/h]
I
in
/ I
out
0-20 mA
I
in
4-20 mA
I
out
4-20 mA, manual,
kontakt
1a
2a
1..
2..
Q
max
default (Q
kal
)
10 l/h
4 l/h
8 l/h
2 l/h
6 l/h
Q
max.
default (Q
cal
)
I
in
/ I
out
0-20 mA
I
in
4-20 mA
I
out
4-20 mA, manual,
contact
I
in
[mA]
Содержание DDI 209
Страница 1: ...GRUNDFOS INSTRUCTIONS DDI 209 Dosing pump Installation and operating instructions ...
Страница 73: ...73 ...
