General Information; Introduction; Service Documentation; Applications - Grundfos DMH 25X Manual De Instrucciones

English (GB) Installation and operating instructions
Original installation and operating instructions
CONTENTS
1. General information
1.1 Introduction
1.2 Service documentation
1.3 Applications
2. Safety
2.1 Identification of safety instructions in this manual
2.2 Qualification and training of personnel
2.3 Risks when safety instructions are not observed
2.4 Safety-conscious working
2.5 Safety instructions for the operator/user
2.6 Safety instructions for maintenance, inspection and
installation work
2.7 Unauthorised modification and manufacture of spare
parts
2.8 Improper operating methods
2.9 Safety of the system in the event of a failure in the
dosing system
3. Technical data
3.1 Identification
3.2 Type key
3.3 Pump types
3.4 Pump performance
3.5 Sound pressure level
3.6 Electrical data
3.7 AR control unit
3.8 Power supply
3.9 Ambient and operating conditions
3.10 Dosing medium
4. Transport and storage
4.1 Delivery
4.2 Unpacking
4.3 Intermediate storage
4.4 Return
5. Product description and accessories
5.1 General description
5.2 Dimensional sketches
5.3 Weight
5.4 Stroke volume
5.5 Materials
5.6 Data of contact pressure gauge for diaphragm leakage
detection (optional)
6. Installation
6.1 General information on installation
6.2 Installation location
6.3 Mounting
6.4 Approximate values when using pulsation dampers
6.5 Optimum installation
6.6 Installation tips
6.7 Tube / pipe lines
6.8 Connecting the suction and discharge lines
7. Electrical connections
7.1 Electric servomotor (optional)
7.2 Electronic preselection counter (optional)
7.3 Electrically heated dosing head (optional)
7.4 Diaphragm controller (optional)
7.5 Connecting the power supply cable
8. Start-up/shutdown
8.1 Initial start-up/subsequent start-up
8.2 Start-up/subsequent start-up of DMH 251, 252 and 253 27
8.3 Start-up/subsequent start-up of DMH 254, 255 and 257 27
8.4 Setting the pressure relief valve
8.5 Zero point adjustments
8.6 Operating the pump
8.7 Shutdown
9. Operation
9.1 Switching on/off
9.2 Setting the dosing capacity
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9.3 Using the AR control unit (optional)
9.4 Electric servomotor (optional)
9.5 Electronic preselection counter (optional)
9.6 Electrically heated dosing head (optional)
Page
10. Maintenance
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10.1 General notes
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10.2 Diaphragm leakage control for diaphragm leakage
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detection
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10.3 Cleaning and maintenance intervals
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10.4 Checking the oil level
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10.5 Cleaning the suction and discharge valves
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10.6 Replacing the diaphragm and gear oil for dosing head
with single diaphragm (no diaphragm leakage
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detection)
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10.7 Replacing the diaphragm for dosing head with double
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diaphragm
5 11. Fault finding chart
12. Dosing curves
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13. Disposal
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Warning
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These complete installation and operating
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instructions are also available on www.grundfos.com.
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Prior to installation, read these installation and
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operating instructions. Installation and operation
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must comply with local regulations and accepted
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codes of good practice.
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1. General information

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1.1 Introduction

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These installation and operating instructions contain all the
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information required for starting up and handling the DMH 25X
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piston diaphragm dosing pump.
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If you require further information or if any problems arise, which
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are not described in detail in this manual, please contact the
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nearest Grundfos company.
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1.2 Service documentation

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If you have any questions, please contact the nearest Grundfos
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company or service workshop.
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1.3 Applications

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The DMH 25X pump is suitable for liquid, non-abrasive and
non-inflammable media strictly in accordance with the
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instructions in this manual.
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Explosion-proof pumps are identified from the pump
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and motor nameplates. An EC declaration of
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conformity is provided in accordance with the EC
Note
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directive 2014/34/EU, the so-called ATEX directive.
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This declaration of conformity replaces the
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declaration of conformity in this manual.
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Warning
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To operate a pump which has been identified as an
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explosion-proof pump for the dosing of inflammable
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media or for operation in potentially explosive
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operating sites in accordance with the EC directive
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2014/34/EU, refer to the enclosed manual
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"ATEX-approved pumps" in addition to this manual.
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Warning
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Other applications or the operation of pumps in
ambient and operating conditions, which are not
approved, are considered improper and are not
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permitted. Grundfos accepts no liability for any
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damage resulting from incorrect use.
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