Grundfos DMH 25 Series, DMH 28 Series, DMH 251, DMX 226, DMH 255 Installation And Operating Instructions, Supplement

GRUNDFOS INSTRUCTIONS

ATEX-approved pumps

DMH 25X, DMH 28X, DMX 226

Installation and operating instructions, supplement

English (GB) Installation and operating instructions

Caution

Note

Caution

Caution

Caution

Caution

Note

DMH 24-10 B-PVC/V/G-X-41B1B1E2
95713001 Type 251
S/N: 10000001
50Hz 24l/h 10bar 120
II 2GD cIIC T130°C
95713001P1107400766944

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Grundfos Water Treatment GmbH
Reetz-Str. 85 D-76327 Pfinztal

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English (GB)

Original installation and operating instructions

CONTENTS

1. Symbols used in this document

2. Operating pumps in potentially explosive
atmospheres

3. Device designs

3.1 Identification

3.2 Pump configuration

3.3 Declaration according to ATEX GUIDELINES, 4TH
EDITION - September 2012, concerning the assembling
of pump and motor

4. Operating conditions

4.1 Environmental conditions

4.2 Dosing medium

5. Installation

5.1 Earthing

5.2 Overflow valve

5.3 Suction line

5.4 Dosing of combustible media

6. Commissioning

7. Operation

7.1 Safety instructions for operating the explosion-proof
pump

8. Maintenance

8.1 Cleaning

8.2 Lubrication

8.3 Accessories / peripherals

8.4 Tools and maintenance work

9. Declaration of conformity / certificates

Warning
Prior to installation, read these installation and

operating instructions. Installation and operation
must comply with local regulations and accepted
codes of good practice.

Warning
In addition to these instructions, observe the general

installation and operating instructions supplied with
the pump.

1. Symbols used in this document

Warning
If these safety instructions are not observed, it may

result in personal injury.

If these safety instructions are not observed, it may
result in malfunction or damage to the equipment.

Notes or instructions that make the job easier and
ensure safe operation.

Page

3. Device designs

The motor and accessories for the pumps, e.g. the
metrology-based monitoring, must at minimum meet

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3.1 Identification

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Fig. 1 Example of ATEX nameplate

Pos. Description

3.1.1 Manufacturer

GRUNDFOS Holding A/S
Poul Due Jensens Vej 7A
8850 Bjerringbro
DENMARK

Grundfos Holding A/S has authorised for manufacturing and
placed the entire responsibility for the products on Grundfos
Water Treatment GmbH:

GRUNDFOS Water Treatment GmbH
Reetzstraße 85
76327 Pfinztal
GERMANY

the requirements of Directive 2014/34/EU as
applicable to pumps.

The original configuration of the pump must not be
modified.

This manual is valid for pumps with "year and week
code" from 1401 (year 2014, week 01). For older
pumps use the manual with release date 0712 (see
backpage).

1 Type designation
2 Model
3 Maximum capacity [l/h]
6 Product number

8 Year and week code
10 Maximum pressure [bar]
11 Serial number
12 ATEX designation
13 Manufacturer

TM03 7006 4313

2. Operating pumps in potentially explosive atmospheres

This manual describes additional conditions or special
considerations affecting the operation of pumps in potentially
explosive atmospheres.

This manual is only valid together with the installation
and operating instructions for the pump. Both

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documents should be used.

Installation, maintenance and repairs must only be
carried out by suitably qualified and authorised
personnel.

3.2 Pump configuration

Caution

Caution

Caution

Caution

Caution

Note

Caution

Note

Grundfos produces pumps in accordance with Directive
2014/34/EU. These pumps correspond to the specifications in the
table below.

Pumps which are not configured in accordance with
the table cannot be used in potentially explosive
atmospheres.

Permissible pump configuration

Feature Description

Front plate Metallic
Electronics No electronics

3.2.1 Diaphragm leakage detection

DMH pumps meeting the requirements of Directive 2014/34/EU
can optionally be fitted with an approved diaphragm leakage
detection with an Ex i pressure gauge meeting the requirements
of Directive 2014/34/EU.

Pumps with other types of diaphragm leakage
detection cannot be used in potentially explosive
atmospheres.

3.2.2 Dosing head and valves

Grundfos supplies pumps meeting the requirements of
Directive 2014/34/EU with appropriately approved dosing
head/valve combinations meeting the requirements of Directive
2014/34/EU.

Pumps with other types of dosing head/valve
combination cannot be used in potentially explosive
atmospheres.

Stainless-steel valves must not be combined with
non-metal dosing heads.

The size of the dosing head (depending on the pump type) and
the dosing head material determine the suitability of the pump for
operation in potentially explosive atmospheres caused by media
of group IIB or IIC:

Pump types

Dosing head
material

PVC IIC IIB IIC IIC IIB
Stainless steel,

DIN 1.4571
Stainless steel,

DIN 2.4610
PP IIC IIB IIC IIC IIB
PVDF IIC IIB IIC IIC IIB

3.2.3 Motor

Grundfos pumps complying with Directive 2014/34/EU are
supplied with motors that are complying with Directive
2014/34/EU and have been tested and labelled accordingly.

Alternatively, pump units can be supplied separately, and in this
case the user must fit a motor that complies with
Directive 2014/34/EU.

DMH

251-255

Pumps with other types of motor cannot be used in
potentially explosive atmospheres.

DMH

257

IIC IIC IIC IIC IIC

IIC IIC IIC - -

DMH

28X

DMX 226

Head

sizes 1-3

DMX 226

Head

size 4

3.2.4 Pump designation

The information meeting the requirements of Directive
2014/34/EU given on the pump as a non-electrical device
depends on the pump configuration selected.

The labelling is only applicable to the pump unit.

Nameplate of the pump unit only

Suitable for category 2,

Pump unit nameplate

II 2GD c IIB T130 °C IIB / 130 °C

II 2GD c IIC T130 °C IIC / 130 °C

Further information about using the pump can be found in section

4. Operating conditions.

explosion group /

temperature class

3.3 Declaration according to ATEX GUIDELINES, 4TH EDITION - September 2012, concerning the assembling of pump and motor

Grundfos declares that there is no additional ignition hazard as a
result of assembling the pump and motor. Pump assembled with
motor is considered a combination of individual items of
equipment in terms of explosion protection. Therefore, the
manufacturer of the pump and the manufacturer of the electrical
motor supply an EC declaration of conformity for each of both
items.

4. Operating conditions

4.1 Environmental conditions

The pumps with appropriate nameplates are suitable for
operation in potentially explosive atmospheres Zones IIB or IIC,
depending on the type of pump and its equipment.

The materials used for seals and lubricants must be resistant to
vapours, gases or dust generated in the atmosphere of the
operating area. This applies particularly to contact with solvent
vapours which can damage plastics or change the composition of
oil or gear lubricant, thereby affecting its efficiency/ability to
function.

The pumps may only be used if, under the prevailing
operating conditions, their materials and operating
liquids are sufficiently resistant to mechanical and/or
chemical influences in order not to jeopardise
explosion protection.

4.2 Dosing medium

4.2.1 Permissible temperature

The media temperature cannot be increased for
SIP/CIP applications.

4.2.2 Permissible dosing media

The DMH 25X, DMH 28X and DMX 226 pumps are suitable for
liquid, non-abrasive and non-inflammable media.

The DMH 25X and DMH 28X pumps in the following configuration
can also be used for dosing combustible media:

• Explosion-proof design with appropriate designation on the

pump nameplate, see section 3.1 Identification, and

• stainless-steel dosing heads and valves, and

• stainless-steel design of the diaphragm leakage detection in

the explosion-proof design with evaluator.

English (GB)

Observe the nameplate of the motor.

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