3.6.1 Inputs and outputs
Inputs
Contact signal
Maximum load: 12 V, 5 mA
Current 0-20 mA
Maximum load: 22 Ω
Remote on/off
Maximum load: 12 V, 5 mA
Two-stage tank-empty signal
Maximum load: 12 V, 5 mA
Dosing controller and diaphragm leakage sensor
Outputs
Current 0-20 mA
Maximum load: 350 Ω
Error signal
Maximum ohmic load: 50 VDC / 75 VAC, 0.5 A
Stroke signal
Contact time/stroke: 200 ms
Pre-empty signal
Maximum ohmic load: 50 VDC / 75 VAC, 0.5 A
AR control unit factory settings
•
Inputs and outputs: NO (normally open)
or
•
inputs and outputs: NC (normally closed).
3.7 Power supply
Power supply for AC voltage
Rated voltage
Permissible deviation from rated
value
230 / 400 V
± 10 %
240 / 415 V
± 10 %
115 V
± 10 %
Maximum permissible mains impedance
(0.084 + j 0.084) Ohm (testing according to DIN EN 61000-3-11).
These details apply to 50 Hz.
3.8 Ambient and operating conditions
•
Permissible air humidity: max. relative humidity: 70 % at +40 °C,
90 % at +35 °C.
Caution
The installation site must be under cover!
Do not install outdoors!
3.8.1 DMH with motor labelled for coolant temperature -20 °C ≤
T
amb
≤ 40 °C
•
Permissible ambient temperature: 0 °C (standard) to +40 °C (for
an installation height up to 1000 m above sea level)
•
Pumps with minimum T
amb
-20 °C available on request
•
Permissible storage temperature: -20 °C to +50 °C.
3.8.2 DMH with motor labelled for coolant temperature -20 °C ≤
T
amb
≤ 55 °C and with dosing head material stainless steel
or PVDF
•
Permissible ambient temperature: 0 °C (standard) to +55 °C (for
an installation height up to 1000 m above sea level)
•
Pumps with minimum T
amb
-20 °C available on request
•
Permissible storage temperature: -20 °C to +55 °C.
Note
Observe the nameplate of the motor.
3.9 Dosing medium
Note
In the event of questions regarding the material resistance
and suitability of the pump for specific dosing media,
please contact Grundfos.
The dosing medium must have the following basic characteristics
for the standard pumps:
•
liquid
•
non-abrasive
The dosing of abrasive media is possible with certain versions,
on request.
•
non-flammable
The dosing of inflammable media is possible with certain
versions of explosion-proof pumps, in accordance with ATEX.
Maximum permissible viscosity at operating temperature
Applies to:
•
Newtonian liquids
•
non-degassing media
•
media without suspended matter
•
media with a density similar to water.
Note
Note that the viscosity increases with decreasing tempera-
ture!
Pump model
Up to stroke
rate 63
[n/min]
Stroke rate
64-120
[n/min]
From stroke
rate 121
[n/min]
Maximum viscosity
[mPa s]
DMH 251
300
100
50
DMH 252
300
100
50
DMH 253
300
100
10
DMH 254
300
100
5
DMH 255
200
100
5
DMH 257
200
50
5
1
The stated values are approximate values and apply to the standard
pumps.
Permissible media temperature
Dosing head
material
Min. media
temperature
Max. media temperature
p <
10 bar
p <
16 bar
p <
25 bar
[°C]
[°C]
[°C]
[°C]
PVC
0
40
20
-
Stainless steel,
DIN 1.4571
-10
90
90
90
Alloy C-4,
2.4610
-10
90
90
90
PP
0
40
20
-
PVDF
-10
60
20
-
1
For SIP/CIP applications (not with ATEX): A temperature of 145 °C at a
counter-pressure of max. 2 bar is permitted for a short period (15
minutes).
2
At 70 °C, the maximum counter-pressure is 9 bar.
Warning
Observe the chemical manufacturer's safety instructions
when handling chemicals!
Caution
The dosing medium must be in liquid form!
Observe the freezing and boiling points of the dosing me-
dium!
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-
dia are chemically resistant to the dosing medium under
operating conditions!
Make sure that the pump is suitable for the actual dosing
medium!
12
English (GB)
Summary of Contents for DMH 25X
Page 2: ......
