KNF N 922 Ex Bedienungsanleitung

N922 EX

TRANSLATION OF ORIGINAL OPERATION AND

INSTALLATION INSTRUCTION

ENGLISH

KNF 313600 11/19 EN-US

ATEX

Notice!

Before operating the pump and the accessories, read the operating and installation instructions and observe

the safety notices!

DIAPHRAGM PUMP

Index

1 About this document ......................................................... 3

2 Use ................................................................................... 5

3 Safety.............................................................................. 11

4 Technical data ................................................................ 13

5 Design and function ........................................................ 15

6 Transport ........................................................................ 16

7 Installation and connection ............................................. 17

8 Operation ........................................................................ 27

9 Servicing ......................................................................... 31

10 Troubleshooting .............................................................. 38

11 Spare parts and accessories .......................................... 41

12 Returns ........................................................................... 43

13 Appendix......................................................................... 44

KNF Neuberger GmbH

Alter Weg 3

79112 Freiburg

Germany

Tel. +49 (0)7664/5909-0

Fax. +49 (0)7664/5909-99

www.knf.com

Diaphragm pump N922 EX About this document

Translation of Original Operation and Installation Instruction, english, KNF 313600 11/19 3

1 About this document

1.1 Using the operating and installation instructions

The operating and installation instructions are part of the pump.

àIn the event of uncertainties with regard to the content of the operating

and installation instructions, please contact the manufacturer (contact

data: see www.knf.com). Please have the type designation and serial

number of the pump ready.

àRead the operating and installation instructions before you commission

the pump.

àGive the operating and installation instructions to the next owner.

àKeep the operating and installation instructions within reach at all

times.

Project pumps For customer-specific project pumps (pump models that begin with "PJ" or

"PM"), there may be deviations from the operating and installation instruc-

tions.

àFor project pumps, also observe the agreed specifications.

Motor The operating and installation instructions apply for pumps without motor.

àAlso observe the operating instructions for the motor in the appendix.

1.2 Symbols and markings

Warning notice

WARNING

A notice that warns you of danger is located here.

Possible consequences of a failure to observe the

warning notice are specified here. The signal

word, e.g., warning, indicates the danger level.

àMeasures for avoiding the danger and its

consequences are specified here.

Danger levels

Signal word Meaning Consequences if not

observed

DANGER warns of immediate

danger

Death or serious injury

or serious damage will

result.

WARNING warns of possible dan-

ger

Death or serious injury

or serious damage are

possible.

CAUTION warns of a possibly

dangerous situation

Minor injuries or dam-

age are possible.

Tab.1

About this document Diaphragm pump N922 EX

4 Translation of Original Operation and Installation Instruction, english, KNF 313600 11/19

Explanations of pictograms

Pictogram Meaning

Warning of hand injuries through crushing

Warning of hot surface

Warning of electrical voltage

Warning of explosive materials

Observe the operating instructions

Tab.3

Other notices and symbols

àAn activity to be carried out is specified here (a step).

1. The first step of an activity to be carried out is specified here.

Follow other sequentially numbered steps.

This symbol indicates important information.

Diaphragm pump N922 EX Use

Translation of Original Operation and Installation Instruction, english, KNF 313600 11/19 5

2 Use

2.1 Proper use

The pumps are intended exclusively for transferring gases and vapors.

Responsibility of the owner

Operating parameters and

conditions

Only install and operate the pumps in accordance with the operating pa-

rameters and conditions described in Chapter 4 Technical data and Chap-

ter 2.3 Use in potentially explosive areas.

Only pumps that are fully assembled and in the condition as delivered may

be operated.

Make sure that the installation location is dry and that the pump is pro-

tected against rain, splash, gushing and drip water as well as from other

contaminants.

The pump is suitable for transferring potentially explosive atmospheres

and for operation in potentially explosive atmospheres.

The tightness of the connections between the pipes of the application and

the pump (or the connection of the pump) is to be checked at regular inter-

vals. Leaky connections carry the risk of releasing dangerous gases and

vapors from the pump system.

Requirements for the transferred

medium

Before transferring a medium, check whether the medium can be trans-

ferred danger-free in the specific application.

Before using a medium, check the compatibility of the media-contacting

components (see 4 Technical data) with the medium.

Risk of dangerous gas mixtures during pump operation if diaphragm

breaks: Depending on the medium being transferred, breakage of the di-

aphragm can result in a dangerous mixture if the medium mixes with the

air in the compressor housing or the surroundings.

Make certain that no risk of explosion arises even in extreme operating sit-

uations (temperature, pressure) and in the event of system breakdowns.

Only transfer gases that remain stable under the pressures and tempera-

tures that arise in the pump.

2.2 Improper use

The pumps are not suitable for use below ground.

The pumps are not suitable for transferring:

§Dusts

§Liquids

§Aerosols

§Biological and microbiological substances

§Explosives

§Fibers

§Food

Pumps that can produce both vacuum as well as overpressure may not be

used to simultaneously produce vacuum and overpressure.

This function can be made possible on a project basis upon consultation

with KNF Customer Service.

No overpressure may be applied to the suction side of the pump.

This function can be made possible on a project basis upon consultation

with KNF Customer Service.

Use Diaphragm pump N922 EX

6 Translation of Original Operation and Installation Instruction, english, KNF 313600 11/19

2.3 Use in potentially explosive areas

In potentially explosive areas (zones), only operate pumps of the appropri-

ate device category and temperature class.

The pumps have the following explosion protection designation:

Designation Description

Symbol for explosion-proof pumps

II Device group (See Chapter 2.4.1 Device groups)

2/2G Device category (See Chapter 2.4.2 Device cate-

gories for gas)

Ex Symbol indicates that the device complies with

one or more ignition protection types

H Symbol for ignition protection type (See Chapter

2.4.5 Ignition protection type)

II B + H2 Explosion groups (see Chapter 2.4.3 Explosion

groups)

T3 Temperature class (see Chapter 2.4.4 Tempera-

ture classes)

Gb Equipment protection level (See Chapter 2.4.6

Equipment protection level for gas)

Special operating conditions (See Chapter 2.4.7

Special operating conditions)

Tab.5

An ignition hazard assessment in accordance with standards DIN EN ISO

80079-36 and DIN EN ISO 80079-37 was performed for the pumps. The

protective goals were reached by applying ignition protection type con-

structional safety "c".

The explosion protection designation can also be found at the following lo-

cation:

§Type plate of the pump

Motor The pump motor must have at least the same explosion protection as the

pump.

Diaphragm pump N922 EX Use

Translation of Original Operation and Installation Instruction, english, KNF 313600 11/19 7

2.4 Explanations of the explosion protection designation

2.4.1 Device groups

Device group I Device group I applies for devices that are used in underground plants of

mines as well as their underground systems that could be endangered by

methane and/or combustible dusts.

Device group II Device group II applies for devices that are used in other areas that could

be endangered by an explosive atmosphere.

2.4.2 Device categories for gas

The device category describes the frequency and the duration of the oc-

currence of explosive atmospheres during operation.

Device cat-

egory

Description

1G Devices of this category are designed for use in areas in

which an explosive atmosphere consisting of a mixture of air

and gases, vapors or mists is present constantly or for long

periods of time or often.

1D Devices of this category are designed for use in areas in

which an explosive atmosphere consisting of a dust/air mix-

ture is present constantly or for long periods of time or often.

2G Devices of this category are designed for use in areas in

which it is to be expected that an explosive atmosphere con-

sisting of gases, vapors or mists forms occasionally.

2/2G Devices that extract from zone 1 and are designed for use in

areas in which it is to be expected that an explosive atmos-

phere consisting of gases, vapors or mists forms occasion-

ally.

2/-G Devices that extract from zone 1 but are not designed for in-

stallation in a potentially explosive atmosphere (zone).

2D Devices of this category are designed for use in areas in

which it is to be expected that an explosive atmosphere con-

sisting of a dust/air mixture forms occasionally.

3G Devices of this category are designed for uses in areas in

which it is to be expected that an explosive atmosphere re-

sulting from gases, vapors or mists occurs, though in all like-

lihood occurs only seldom and for a very short length of time.

3D Devices of this category are designed for uses in areas in

which it is to be expected that an explosive atmosphere re-

sulting from stirred-up dust occurs, though in all likelihood

occurs only seldom and for a very short length of time.

Tab.7

Use Diaphragm pump N922 EX

8 Translation of Original Operation and Installation Instruction, english, KNF 313600 11/19

2.4.3 Explosion groups

Combustible gases and vapors are classified according to explosion

groups (I, IIA, IIB and IIC) and temperature classes. The following table

shows the classification of the most common combustible gases and va-

pors.

T1 T2 T3 T4 T5 T6

I Methane – – – – –

IIA Acetone

Ethane

Ethyl ac-

etate

Ammonia

Ethyl chlo-

ride

Benzene

Acetic acid

Carbon

monoxide

Methane

Methanol

Methyl chlo-

ride

Naphthalene

Phenol

Propane

Toluene

i-amyl ac-

etate

n-butane

n-butyl alco-

hol

Cyclohex-

anone

1,2-

dichloroetha

Acetic anhy-

dride

Gasoline

Diesel fuel

Jet fuel

Heating oils

n-hexane

Acetalde-

hyde

– –

IIB Town gas Ethylene

Ethyl alcohol

Hydrogen

sulfide

Ethyl ether – –

IIC Hydrogen Acetylene – – – Carbon

disulfide

Tab.9

The classification of gases and vapors into groups with respect to explo-

sion group and temperature class applies for the transferred medium as

well as for the pump surroundings.

Transferred medium The pump may only be used to transfer gases and vapors that belong to

the respective explosion group and corresponding temperature class (or

below) (see designation on the type plate) or that are not explosive and

combustible.

Environment of the pump The pump may only be operated in an environment that contains an at-

mosphere that belongs to the respective explosion group and correspond-

ing temperature class (or below) (see designation on the type plate) or that

is not explosive and not combustible.

Diaphragm pump N922 EX Use

Translation of Original Operation and Installation Instruction, english, KNF 313600 11/19 9

2.4.4 Temperature classes

Maximum surface temperature The maximum surface temperature is the highest temperature that is

reached under the most unfavorable conditions of a surface of the pump.

Ignition temperature The maximum surface temperature of the pump must always be lower

than the lowest ignition temperature of the gas or vapor/air mixture in

which it is used.

Temperature class The maximum surface temperature arises from the design the pump and is

specified as temperature class.

Temperature class Max. surface tempera-

ture [°C]

Ignition temperature

[°C]

T1 450 > 450

T2 300 > 300

T3 200 > 200

T4 135 > 135

T5 100 > 100

T6 85 > 85

Tab.11

2.4.5 Ignition protection type

Designation Description

h Constructional safety "c"

h Ignition source monitoring "b"

h Liquid immersion "k"

Tab.13

An ignition hazard assessment in accordance with standards DIN EN ISO

80079-36 and DIN EN ISO 80079-37 was performed for the pumps. The

protective goals were reached by applying ignition protection type con-

structional safety "c".

Use Diaphragm pump N922 EX

10 Translation of Original Operation and Installation Instruction, english, KNF 313600 11/19

2.4.6 Equipment protection level for gas

The equipment protection level describes the frequency and the duration

of the occurrence of explosive atmospheres in an area.

Equipment

protection

level

Description* Constructional

safety

Ga Devices with very high protection level

for use in potentially explosive areas.

With these devices, there is no risk of ig-

nition during normal operation or in the

event of foreseeable or infrequent faults/

malfunctions.

Very high

Gb Devices with high protection level for

use in potentially explosive areas in

which there is no risk of ignition during

normal operation or in the event of fore-

seeable or infrequent faults/malfunc-

tions.

High

Gc Device with increased protection level

for use in potentially explosive areas.

There is no risk of ignition during normal

operation. The devices have a number

of additional protection measures which

ensure that, in the event of commonly

foreseeable faults in the device, no dan-

ger of ignition exists.

Increased

Tab.15 *according to DIN EN ISO 80079-36

2.4.7 Special operating conditions

§The pumps may not be set up outdoors. Commissioning may only be

performed with suitable weather- and corrosion-protection paneling.

§The pumps are to be set up so that they are not exposed to any UV ra-

diation.

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