Weight; Stroke Volume; Materials; Data Of Contact Pressure Gauge For Diaphragm Leakage Detection (Optional) - Grundfos DMH 25X Installation And Operating Instructions Manual

5.3 Weight

Pump model Dosing head material
PVC, PP, PVDF
DMH 251
Stainless steel 1.4571
Alloy C-4, 2.4610
PVC, PP, PVDF
DMH 252
Stainless steel 1.4571
Alloy C-4, 2.4610
PVC, PP, PVDF
DMH 253
Stainless steel 1.4571
Alloy C-4, 2.4610
PVC, PP, PVDF
DMH 254
Stainless steel 1.4571
Alloy C-4, 2.4610
PVC, PP, PVDF
DMH 255
Stainless steel 1.4571
Alloy C-4, 2.4610
PVC, PP, PVDF
DMH 257
Stainless steel 1.4571
Alloy C-4, 2.4610

5.4 Stroke volume

Stroke volume [cm
Pump model
4 bar
DMH 251 -
DMH 252 -
DMH 253 -
DMH 254 -
DMH 255 -
DMH 257 171
22
Weight [kg]
Single Double
pump pump
11 13
13 17
11 13
13 17
12 17
14 21
27 32
32 42
55 63
65 83
56 88
68 112
3
]
10 bar 16 bar 25 bar
3,5 3,1 2,9
6,4 6,3 -
11,3 - -
31,6 30 -
60 - -
131 - -

5.5 Materials

Pump housing material
• Pump housing: Al 226.
AR control unit enclosure
• Upper part of enclosure: PPO blend
• Lower part of enclosure: aluminium.
Warning
Observe the chemical manufacturer's safety instructions
when handling chemicals!
Make sure that the pump is suitable for the actual dosing
medium!
The resistance of the parts that come into contact with the
media depends on the media, media temperature and op-
erating pressure. Ensure that parts in contact with the me-
Caution
dia are chemically resistant to the dosing medium under
operating conditions!
Further information on resistance with regard to the me-
dia, media temperature and operating pressure is availa-
Note
ble on request.
5.6 Data of contact pressure gauge for diaphragm
leakage detection (optional)
Following data is not valid for contact pressure gauges in
Note
explosion-proof version.
The contact pressure gauge has a reed switch with electrically
isolated contact output, maximum switching power 10 W for DC
current or 10 VA for AC current. The maximum switching voltage is
75 V for DC current or 50 V for AC current, maximum switching
current 0.5 A.
The switching function is set up as an NC contact, i.e. if the
diaphragm breaks, the current circuit is interrupted.
The pressure gauge has a 2-metre cable.