19
5.2 Controlled operation (closed loop)
T
M
0
3 847
5 1607
T
M
0
3 880
4 2507
Proportional
differential
pressure.
The differential
pressure is reduced
at falling flow rate
and increased at
rising flow rate.
T
M
03 8476 1607
T
M
03 8804 2507
Constant
differential
pressure, pump.
The differential
pressure is kept
constant,
independently of
the flow rate.
T
M
03 84
76 16
07
T
M
03 88
06 25
07
Constant
differential
pressure, system.
The differential
pressure is kept
constant,
independently of
the flow rate.
T
M
03
8476
160
7
T
M
03
8805
250
7
Constant pressure.
The pressure is
kept constant,
independently of
the flow rate.
T
M
03 84
77 16
07
T
M
03 88
07 25
07
Constant pressure
with stop function.
The outlet pressure
is kept constant at
high flow rate.
On/off operation at
low flow rate.
T
M
03 8482 1607
T
M
03 8808 2607
Constant level.
The liquid level is
kept constant,
independently of
the flow rate.
T
M
0
3
8
4
8
2
1
6
0
7
T
M
0
3
8
8
0
9
2
6
0
7
Constant level with
stop function.
The liquid level is
kept constant at
high flow rate.
On/off operation at
low flow rate.
T
M
03 8
478 1
607
T
M
03 8
810 2
507
Constant flow rate.
The flow rate is
kept constant,
independently of
the head.
CUE
Δ
p
CUE
Δ
p
CUE
Δ
p
CUE
p
CUE
p
CUE
L
CUE
L
CUE
Q
T
M
03 84
82 16
07
T
M
03 88
1
1 250
7
Constant
temperature.
The liquid
temperature is kept
constant,
independently of
the flow rate.
CUE
t
Grundfos.bk Page 19 Friday, July 30, 2010 10:10 PM
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Grundf
os CU
E
