3
CONTENTS
Page
1. General 3
1.1 Introduction 3
1.2 Service documentation 3
2. Installation data 4
3. Installation sketch 4
4. General information 5
4.1 Applications 5
4.2 Warranty 5
5. Safety 5
5.1 Identification of safety instructions in this manual 5
5.2 Qualification and training of personnel 5
5.3 Risks when safety instructions are not observed 5
5.4 Safety-conscious working 5
5.5 Safety instructions for the operator/user 5
5.6 Safety instructions for maintenance, inspection and
installation work 5
5.7 Unauthorised modification and manufacture of
spare parts 6
5.8 Improper operating methods 6
5.9 Safety of the system in the event of a failure in
the dosing system 6
6. Technical data 6
6.1 Identification 6
6.2 Type key 7
6.3 Pump types 8
6.4 Pump performance 8
6.5 Sound pressure level 11
6.6 Electrical data 11
6.7 AR control unit 11
6.8 Required energy 11
6.9 Ambient and operating conditions 11
6.10 Dosing medium 11
7. Transport and storage 12
7.1 Delivery 12
7.2 Unpacking 12
7.3 Intermediate storage 12
7.4 Return 12
8. Product description and accessories 13
8.1 General description 13
8.2 Dimensional sketches 17
8.3 Weight 19
8.4 Stroke volume 19
8.5 Materials 19
8.6 Data of contact pressure gauge for diaphragm
leakage detection (optional) 19
9. Installation 19
9.1 General information on installation 19
9.2 Installation location 19
9.3 Mounting 19
9.4 Approximate values when using pulsation dampers 20
9.5 Optimum installation 21
9.6 Installation tips 21
9.7 Tube / pipe lines 22
9.8 Connecting the suction and discharge lines 22
10. Electrical connections 23
10.1 Electric servomotor (optional) 23
10.2 Electronic preselection counter (optional) 23
10.3 Electrically heated dosing head (optional) 23
10.4 Diaphragm controller (optional) 24
10.5 Connecting the power supply cable 24
11. Start-up / shutdown 24
11.1 Initial start-up / subsequent start-up 24
11.2 Start-up / subsequent start-up of
DMH 251, 252 and 253 25
11.3 Start-up / subsequent start-up of
DMH 254, 255 and 257 25
11.4 Setting the pressure relief valve 26
11.5 Zero point adjustments 27
11.6 Operating the pump 27
11.7 Shutdown 27
12. Operation 27
12.1 Switching on/off 27
12.2 Setting the dosing capacity 28
12.3 Using the AR control unit (optional) 28
12.4 Electric servomotor (optional) 28
12.5 Electronic preselection counter (optional) 28
12.6 Electrically heated dosing head (optional) 28
13. Maintenance 28
13.1 General notes 28
13.2 Diaphragm leakage control for diaphragm leakage
detection 28
13.3 Cleaning and maintenance intervals 29
13.4 Checking the oil level 29
13.5 Cleaning the suction and discharge valves 29
13.6 Replacing the diaphragm and gear oil for dosing head
with single diaphragm
(no diaphragm leakage detection) 30
13.7 Replacing the diaphragm for dosing head with
double diaphragm 31
14. Fault finding chart 34
15. Dosing curves 36
16. Disposal 49
1. General
1.1 Introduction
These installation and operating instructions contain all the
information required for starting up and handling the DMH 25x
piston diaphragm dosing pump.
If you require further information or if any problems arise, which
are not described in detail in this manual, please contact the
nearest Grundfos Alldos company.
1.2 Service documentation
If you have any questions, please contact the nearest Grundfos
Alldos company or service workshop.
Warning
These complete installation and operating
instructions are also available on
www.Grundfosalldos.com.
Prior to installation, read these installation and
operating instructions. Installation and operation
must comply with local regulations and accepted
codes of good practice.
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