9
* l/h per dosing head; double the capacity for double pumps.
6.4.1 Accuracy
• Dosing flow fluctuation: smaller than ± 1 %
• Linearity deviation: ± 1 % of the full-scale value (for water with
a fully deaerated dosing head).
6.4.2 Inlet pressure and counter-pressure / suction lift
Maximum inlet pressure
Minimum counter-pressure at the discharge valve of the
pump
DMH 213-10 DMH 213-10/213-10 213 10 112 255 10 134 — — —
DMH 291-10 DMH 291-10/291-10 291 10 153 — — — — — —
DMH 46-16 DMH 46-16/46-16 46 16 26 55 16 31 92 16 52
DMH 97-16 DMH 97-16/97-16 97 16 54 116 16 65 193 16 108
DMH 136-16 DMH 136-16/136-16 136 16 75 163 16 90 271 16 150
DMH 166-16 DMH 166-16/166-16 166 16 92 200 16 110 — — —
DMH 202-16 DMH 202-16/202-16 202 16 112 242 16 134 — — —
DMH 276-16 DMH 276-16/276-16 276 16 153 — — — — — —
DMH 255
DMH 194-10 DMH 194-10/194-10 194 10 54 233 10 65 387 10 108
DMH 270-10 DMH 270-10/270-10 270 10 75 324 10 90 540 10 150
DMH 332-10 DMH 332-10/332-10 332 10 92 398 10 110 — — —
DMH 403-10 DMH 403-10/403-10 403 10 112 484 10 134 — — —
DMH 550-10 DMH 550-10/550-10 550 10 153 — — — — — —
DMH 257
DMH 220-10 DMH 220-10/220-10 220 10 28 264 10 34 440 10 56
DMH 440-10 DMH 440-10/440-10 440 10 56 528 10 67 880 10 112
DMH 575-10 DMH 575-10/575-10 575 10 73 690 10 88 1150 10 146
DMH 750-4 DMH 750-4/750-4 750 4 73 900 4 88 1500 4 146
DMH 770-10 DMH 770-10/770-10 770 10 98 924 10 118 — — —
DMH 880-10 DMH 880-10/880-10 880 10 112 1056 10 134 — — —
DMH 1150-10 DMH 1150-10/1150-10 1150 10 146 — — — — — —
DMH 1500-4 DMH 1500-4/1500-4 1500 4 146 — — — — — —
Pump type 50 Hz 60 Hz 100 Hz
Single pump Double pump
Q* p max.
Max.
stroke
rate
Q* p max.
Max.
stroke
rate
Q* p max.
Max.
stroke
rate
[l/h] [bar] [n/min] [l/h] [bar] [n/min] [l/h] [bar] [n/min]
Note
The pump can be operated in the range between
10 % and 100 % of the maximum dosing capacity.
Pump type [bar]
DMH 251 8
DMH 252 8
DMH 253 5
DMH 254 5
DMH 255 0.8
DMH 257 0.8
Pump type [bar]
DMH 251 2
DMH 252 2
DMH 253 2
DMH 254 2
DMH 255 2
DMH 257 2
Note
A positive pressure difference of at least 2 bar is
required between the suction valve and the
discharge valve in order for the dosing pump to
operate correctly.
If the total counter-pressure (at the dosing point)
and geodetic height difference between the
suction valve and the dosing point is less than
2 bar (20 m WC), a pressure-loading valve must
be installed immediately before the dosing point.
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