Gardner Denver WELCH MPC 301 Zp Ex User manual

Operation Manual
(EN)
Translation of the german original manual
Diaphragm pumps
in an explosion-proof design
Models:
► MPC 301 Zp Ex
II 2G c IIB T4 X
(10°C ≤Ta≤40°C)
► MPC 601 Tp Ex
II 2G c IIB T4 X
(10°C ≤Ta≤40°C)
4000481-04
2019-08-13

We are constantly working on the further
development of all our product models.
Reprinting or reproduction of this manual,
including extracts, is not allowed without
the prior written permission of Co. Gardner
Denver Thomas GmbH.
All rights under the copyright laws are
expressly reserved by Co. Gardner Denver
Thomas GmbH.
We reserve the right to make changes and
amendments.
Gardner Denver Thomas GmbH
Am Vogelherd 20
98693 Ilmenau
Germany
T [phone]
F [phone]
[e-mail]
www.gardnerdenver.com/de-de/welch
Customer Support [phone]

Contents
4000481-04 3
Contents
1Important Information.............................................................................................................4
1.1 General Information..................................................................................................................4
1.2 Target Groups...........................................................................................................................4
1.3 Intended Use.............................................................................................................................4
1.4 Use for an Unauthorized Purpose ............................................................................................4
1.5 Safety Devices..........................................................................................................................5
1.6 Meaning of the Warning notes..................................................................................................5
1.7 Product Standards, Safety Regulations....................................................................................5
2Basic Safety Instructions.......................................................................................................6
2.1 General Information..................................................................................................................6
2.2 Electricity...................................................................................................................................6
2.3 Mechanical Systems.................................................................................................................6
2.4 Hazardous Substances.............................................................................................................7
2.5 High Temperatures ...................................................................................................................7
3Description ..............................................................................................................................8
3.1 Design.......................................................................................................................................8
3.2 Principle of Operation ...............................................................................................................8
3.3 Materials of the medium-affecting pump parts..........................................................................8
3.4 Models.......................................................................................................................................9
3.5 Area of Application..................................................................................................................10
3.6 Scope of Delivery....................................................................................................................10
4Technical Data.......................................................................................................................11
4.1 View of device and dimensions...............................................................................................11
4.2 Intake Pressure / Pumping Speed –Diagrams.......................................................................12
4.3 Device Data.............................................................................................................................13
5Installation and Operation....................................................................................................14
5.1 Unpacking...............................................................................................................................14
5.2 Installation and Connection.....................................................................................................14
5.3 Operation ................................................................................................................................14
5.3.1 Start-up ...................................................................................................................................15
5.4 Storage....................................................................................................................................15
5.5 Scrap Disposal........................................................................................................................15
6Maintenance and Servicing..................................................................................................16
6.1 General Requirements............................................................................................................16
6.2 Maintenance Performed by the User......................................................................................16
6.2.1 Disassembly............................................................................................................................17
6.2.2 Assembly.................................................................................................................................17
6.2.3 Test.........................................................................................................................................18
6.3Maintenance by the Manufacturer ..........................................................................................18
6.4Damage Report.......................................................................................................................18
7Troubleshooting....................................................................................................................19
8Spare Parts Overview...........................................................................................................20
8.1 Service kit................................................................................................................................20
8.2 Diaphragm pump MPC 301 Zp Ex..........................................................................................21
8.2.1 Part list MPC 301 Zp Ex..........................................................................................................22
8.3 Diaphragm pump MPC 601 Tp Ex..........................................................................................23
8.3.1 Part list MPC 601 Tp Ex..........................................................................................................24
Annexe
- Type Examination Certificate for MPC 301 Zp Ex (Page 1 - 4)
- Type Examination Certificate for MPC 601 Tp Ex (Page 1 - 4)
- Supplement to Type Examination Certificate for MPC 601 Tp Ex (Page 1 - 3)
- EC Declaration of Conformity (Page 1)

Important Information
4 4000481-04
1 Important Information
1.1 General Information
The Diaphragm pumps in an explosion-proof design conform to the:
2006 / 42 / EC
Machinery Directive
2014 / 30 / EU
Electromagnetic Compatibility Directive
2014 / 34 / EU
ATEX Guideline for use in potentially explosive atmospheres
The corresponding test marks can be found on the device and on the documentation belong-
ing to the device. Observe the binding national and local regulations when fitting the pump
into installations.
1.2 Target Groups
This Operating Manual is intended for the personnel planning, operating and maintaining
Diaphragm pumps in an explosion-proof design.
This group of people includes:
Designers and fitters of vacuum apparatus,
Employees working on commercial laboratory and industrial vacuum technology applica-
tions and
Service personnel for diaphragm pumps
The personnel operating and maintaining the diaphragm pumps must have the technical
competence required to perform the work that has to be done.
The user must authorize the operating personnel to do the work that has to be done.
The personnel must have read and understood the complete Operating Manual before using
the diaphragm pumps.
The Operating Manual must be kept at the place of use and be available to the personnel
when required.
1.3 Intended Use
The layout of the diaphragm pump must be appropriate for the conditions of use. The
user bears the sole responsibility for this.
The diaphragm pump may only be operated under the conditions stated
- in the "Technical Data" section,
- on the type plate, and
- in the technical specification for the order concerned.
Diaphragm pumps are approved for extracting, pumping and compressing gases and va-
pours. If these gases and vapours are toxic, then the user must observe the currently
valid safety regulations for this application.
1.4 Use for an Unauthorized Purpose
It is forbidden to use the pump for applications deviating from the technical data stated on
the type plate or the conditions stated in the supply contract, or to operate it with missing or
defective protective devices.

Important Information
4000481-04 5
1.5 Safety Devices
Measures such as the following are for the safety of the operating personnel:
electrical connection with a protective conductor (operating mode S1) and an earthing
plug
“Hot Surface" label on the pump body - warning notice
Connect the motor to a fixed electricity supply.
Fit a suitable motor switch with a protective device into the cable supplying the motor
Inert gas monitoring to detect leaks and diaphragm rupture
(customer installation)
The diaphragm pump must not be operated without these elements.
1.6 Meaning of the Warning notes
Take note of the warning notices. They are in the following box:
CAUTION ! / WARNING !
Hazard which may lead to serious injuries or material damage.
1.7 Product Standards, Safety Regulations
Diaphragm pumps in an explosion-proof design conform to the following product
standards:
DIN EN ISO 12100:2011-03
Safety of machinery -
General principles for design - Risk assessment and risk reduction
DIN EN ISO 13857:2008-06
Safety of machinery - Safety distances to prevent hazard zones being reached
by upper and lower limbs
DIN EN 1012-2:2011-12
Compressors and vacuum pumps - Safety requirements -
Part 2: Vacuum pumps
DIN EN ISO 2151:2009-01
Acoustics - Noise test code for compressors and vacuum pumps - Engineering
method (grade 2)
DIN EN 60204-1:2014-10
Safety of machinery - Electrical equipment of machines -
Part 1: General requirements
DIN EN 61000-6-2:2011-06
DIN EN 61000-6-4:2011-09
Electromagnetic compatibility (EMC) -
Part 6-2: Generic standards - Immunity for industrial environments
Part 6-4: Generic standards - Emission standard for industrial environments
DIN EN 61010-1/A1:2015-04
Safety requirements for electrical equipment for measurement, control and
laboratory use - Part 1: General requirements
DIN EN 50110-1:2014-02
Operation of electrical installations
DIN EN 1127-1:2011-10
Explosive atmospheres - Explosion prevention and protection -
Part 1: Basic concepts and methodology
DIN EN 13463-1:2009-07
DIN EN 13463-5:2011-10
Non-electrical equipment for use in potentially explosive atmospheres -
Part 1: Basic method and requirements
Part 5: Protection by constructional safety 'c'
DIN EN 60079-10-1:2009
VDE 0165-101:2009-10
Explosive atmospheres
Part 10-1: Classification of areas - Explosive gas atmospheres
Directive 2012/19/EU
Electrical and electronics - old devices (WEEE)
Directive 2011/65/EUDangerous materials in electrical and electronics devices (RoHS II)
China - RoHS II Environment protection law - China 2016-01
The following additional safety regulations apply in the FR Germany:
BGV A3
Electrical equipment and operating materials
VBG 5
Power-driven machines
BGR 120
Guidelines for laboratories
BGI 798
Hazard assessment in the laboratory
BGG 919 (VBG 16)
Accident prevention regulations for "compressors"
BGR 189 (BGR 195;192;197)
Use of protective working clothes
Observe the standards and regulations applying in your country when you use the dia-
phragm pumps in an explosion proof design.

Basic Safety Instructions
6 4000481-04
2 Basic Safety Instructions
2.1 General Information
Warning notices must be observed. Disregarding them may lead to damage to health and
property.
The diaphragm pumps must be operated by personnel who can detect impending dangers
and take action to prevent them from materialising.
The manufacturer or authorized workshops will only service or maintain the diaphragm
pump if it is accompanied by a fully completed damage report. Precise information about
the contamination (also negative information if required) and thorough cleaning of the
diaphragm pump are legally binding parts of the contract.
Contaminated diaphragm pumps and their individual parts must be disposed of in accor-
dance with the legal regulations.
The local regulations apply in foreign countries.
2.2 Electricity
Diaphragm pumps of operation mode S1 are supplied. When the location of operation mode
S1 devices is changed, please note that the testing must be repeated in accordance with
DIN EN 0105, DIN EN 0702 and DGUV Regulation 3. The local regulations apply in foreign
countries. Please note the following when connecting to the electrical power supply system:
The electrical power supply system must have a protective connector according to DIN
IEC 60364-4-41.
The protective connector must not have any breaks.
The connecting cable must not be damaged.
2.3 Mechanical Systems
Improper use can lead to injuries or material damage. Observe the following instructions:
Only operate the diaphragm pumps with hoses of the specified dimensions.
The absolute pressure generated at the pressure port must not exceed 1.5 bar!
Solid particles in the pumping medium impair the pumping action and can lead to dam-
age. Prevent solid particles penetrating into the pump.
Hazardous substances must be separated out as far as this is technically possible before
they reach the pump.
External mechanical stresses and vibrations must not be transmitted to the pump. Only
use flexible laboratory hoses or metal hoses for connecting diaphragm pumps.
Suitable securing devices must be fitted to the hose connections in order to prevent them
working loose.
In order to prevent danger arising when one or more diaphragms break, a suitable inert
gas is to be fed into the casing through the hose nipples on the front, the casing is to be
flushed during operation.
Inert gas is introduced through hose nipples attached to the casing. They must be flushed
and monitored during operation. A diaphragm rupture and the associated excessive out-
flow of pumping medium into the environment can be detected by monitoring the inert gas
flow in the inert gas outlet.
The pump must not be used to suck up fluids. Lay the exhaust pipe so that it slopes
downwards, so allowing condensate to flow out of the pump.
Collect the condensate and dispose of it in an environmentally compatible manner.
Maintain a space of least 50 cm between the pump and adjacent parts in order to enable
the pump to cool.

Basic Safety Instructions
4000481-04 7
2.4 Hazardous Substances
The operating company bears the responsibility for the use of the diaphragm pump.
Hazardous substances in the gases to be pumped can cause personal injuries and property
damage. Pay attention to the warning notices for handling hazardous substances.
The local regulations apply in foreign countries.
Combustible Gases
The user must assess the process in accordance with Directive 1999/92/EC (ATEX 137) for
the extraction of explosive gas/air mixtures inside or outside a similar environment. In accor-
dance with the requirements indicated by this assessment, a suitable device must be se-
lected which fulfils the specifications of Directive 2014/34/EU.
Aggressive gases
The MPC series is designed for extracting aggressive gases.
Please ensure that the substances used and/or arising are compatible with the stability of the
pump materials that come into contact with the gases.
Poisonous gases
Use a separator when pumping poisonous or harmful gases. Prevent such substances from
leaking out of the appliance or pump. Treat these substances according to the applicable
environmental protection regulations.
Test the strength and leak-tightness of the connecting lines and the connected apparatus.
Prevent environmental poisons escaping.
Fulfil the requirements, for example:
German Hazardous Substances Regulation (GefStoffV) of 01. December 2010
Regulations 2016/1179/EU
(Classification, Packaging and Labelling of dangerous substances),
Manufacturer's safety data sheets on hazardous substances.
2.5 High Temperatures
The diaphragm pump may heat up as a result of the temperature of the gas being pumped
and through compression heat.
Prevent the following maximum permissible temperatures from being exceeded.
Pumps with motors in Ex design do not have an overload protection switch. The user must
install them permanently in the terminal box in the course of protective measures complying
with the currently valid regulations.
•+ 40 °C for the environment, and
•+ 60 °C for the gas to be pumped.

Description
8 4000481-04
3 Description
3.1 Design
The diaphragm pump consists of the pump
casing, the drive unit and the drive motor.
The pump casing contains the drive unit and
two or four pump heads.
Each pump head contains a diaphragm
and the work valves. The pump heads are
arranged in a horizontally-opposed pattern.
The pump heads are driven via an eccentric
shaft with a connecting rod.
Two and three stage pumps are supplied,
depending upon the circuitry of the pump
heads.
Fig. 1 Diaphragm pump MPC 601 Tp Ex
3.2 Principle of Operation
Motor, eccentric shaft and connecting rod set the diaphragms in stroke movement. This
changes the size of the space between the diaphragms and pump head (pump chamber).
Increasing the size of the pump chamber opens the inlet valve while the outlet valve is
closed (intake process).
Decreasing the size of the pump chamber ejects the gas through the outlet valve.
The valves are actuated by the gas being pumped.
3.3 Materials of the medium-affecting pump parts
Component
Chemical model
MPC ... Ex model
(resistant to aggressive gases)
Connecting head with insert
PTFE with carbon-fibre reinforced *)
O-Ring
EPDM
Screw fitting
PVDF
Valves
PEEK
Diaphragm
Elastomer + PTFE Layer
Manifold
PP
*) electrically conductive 103(DIN 53482 manufacturer's certificate is present)
Material resistance to aggressive media see:
Publisher Hoppenstedt Publishing (18. September 2007)

Description
4000481-04 9
3.4 Models
Circuitry of the pump heads:
Two-stage (Z):
Both pump heads are connected in series.
Ultimate pressure
Model
< 8 mbar
MPC 301 Zp Ex
Three stage (T):
The two pump heads are connected in parallel, two further pumps
in series.
Ultimate pressure
Model
< 2 mbar
MPC 601 Tp Ex
Note:
The three-stage model of the diaphragm pump is fitted with a by-
pass and a non-return valve parallel to the second and third stages.
These serve to relieve any intermediate compression which may
occur at the start or while working in the upper pressure range.
During maintenance or repair, ensure that they are fitted in the cor-
rect position and that they function correctly according to the wiring.

Description
10 4000481-04
3.5 Area of Application
Diaphragm pump explosion-proof models are intended for:
Aspirating, pumping and compressing neutral and aggressive gases and vapors.
Generating a vacuum down to an ultimate pressure < 8 mbar or < 2 mbar.
Aspirating, pumping and compressing an explosive atmosphere –comprising air and
combustible gases, vapors and mists in any mix ratio –from zone 1 areas at risk of ex-
plosion (device category 2 according to ATEX).
Installation and operation of the diaphragm pumps in zone 1 areas at risk of explosion
(device category 2 according to ATEX).
The permissible temperature classes and explosion groups of the atmospheres –com-
prising air and combustible gases, vapors and mists in any mix ratio –that are to be
pumped or which are ambient are determined according to the specifications of standard
EN 13 463-1. The diaphragm pumps mentioned here have been assigned to T4 IIB.
Substances that tend to decompose spontaneously, such as acetylene C2H2, carbon di-
sulfide CS2and explosives, lie outside the scope of the application of Atex-Directive
2014/34/EU.
Part and/or part group
Material
Surface resistance
Connecting head
PTFE carbon-fibre reinforced
10 3
PTFE insert
PTFE carbon-fibre reinforced
10 3
Pump head
PTFE carbon-fibre reinforced
10 3
PTFE layer diaphragm
PTFE
10 17
Valve
PEEK
10 15
Manifold
PP
10 14
Screws fitting
PVDF
10 14
Check valve
PVDF
10 14
Vacuum hose
PTFE
10 17
Tensioning disk
PTFE coating
10 17
O-Rings
EPDM
10 7
3.6 Scope of Delivery
The scope of delivery is specified in the supply contract.

Technical Data
4000481-04 11
4 Technical Data
4.1 View of device and dimensions
Fig. 2 Dimensions MPC 301 Zp Ex Model
Fig. 3 Dimensions MPC 601 Tp Ex Model
The information presented in this material is based on technical data and test results of nominal units. It is believed
to be accurate and reliable and is offered as and aid to help in the selection of products.
It is the responsibility of the user to determine the suitability of the product for the intended use and the user as-
sumes all risk and liability whatsoever in connection therewith. Gardner Denver Thomas GmbH does not warrant,
guarantee or assume any obligation or liability in connection with this information.
(H)
(W)
(D)
(H)
(W)
(D)

Technical Data
12 4000481-04
4.2 Intake Pressure / Pumping Speed –Diagrams
Fig. 4 Intake Pressure / Pumping Speed –Diagram, Model MPC 301 Zp Ex
Fig. 5 Intake Pressure / Pumping Speed –Diagram, Model MPC 601 Tp Ex

Technical Data
4000481-04 13
4.3 Device Data
Parameter
Unit
Diaphragm pump Models
MPC 301 Zp Ex
MPC 601 Tp Ex
Ex - marking
-
II 2G c IIB T4 X
(10°C ≤Ta≤ 40°C) II 2G c IIB T4 X (10°C ≤Ta≤ 40°C)
Type Examination Certificate
number (see appendix)
-
IBExU04ATEXB018 X
Pumping speed
DIN 28432 (at speed of 1500 rpm)
m3/ h
2.3
4.5
l / min
38
75
Ultimate pressure
(at speed of 1500 rpm)
mbar
8
2
Max. inlet pressure
bar
1
1
Max. outlet pressure
(absolute pressure)
bar
1.5 *)
1.5 *)
Inert flushing of the drive
l / h
20 ±10 % **)
20 ±10 % **)
Intake and pressure ports
-
Hose nozzle DN8
for hose inside Ø 8 mm
Small flange
DN 16 KF
Operating temperature
°C
+ 10 to + 40
+ 10 to + 40
Max. operating gas
temperature
(measured on the inlet of the
vacuum pump)
°C
+ 60 *)
+ 60 *)
Bearing
maintenance-free
maintenance-free
Reference surface
sound pressure level
DIN EN ISO 2151
dB (A)
44
44
Rated speed 1/min 1415 1380
Three-phase a.c. motor -
model
(without motor protection switch,
switch and cable)
CD 63 L –4
II 2G EEx de IIC T4
PTB 99 ATEX 1051
CD 71 L –4
II 2G EEx de IIC T4
PTB 99 ATEX 1051
Power
kW0.18 0.37
Operating mode
-
S 1
S 1
Type of protection
DIN EN 60529
-
IP 55
IP 55
Weight
kg
22.9
29.7
Dimensions (W/D/H)
(without connections)
mm
240 / 300 / 260
240 / 425 / 272
Order no.
-
4000481-04
4000511-04
*) If this value is exceeded, the information about the temperature class inside and outside
is no longer applicable.
**) The inert gas flushing must be monitored.
When exceeding or falling below the tolerances, the pump must be switched off.
IBExU04ATEXB017 X

Installation and Operation
14 4000481-04
5 Installation and Operation
5.1 Unpacking
Carefully unpack the diaphragm pump.
Check the pump for:
Transport damage,
Conformity with the specifications of the supply contract (Model, electrical supply data),
Completeness of the delivery.
Please inform us without delay if there are discrepancies between the delivery and the con-
tractually agreed scope of delivery, or if damage is detected.
Please take note of the general terms of business of the manufacturing firm.
In case of a claim under warranty, the device must be returned in packaging that is
suitable for protecting it during transport.
5.2 Installation and Connection
1. Set the diaphragm pump on a flat and horizontal surface.
2. Remove the protective caps on the intake and exhaust ports.
3. Prepare the connections.
4. Connect electrically under compliance with the currently valid regulations described in
chapters 1.7 and 2.2.
5. Connect the vacuum connector (DN 8 and/or DN 16 KF) to the intake port.
6. Connect the pressure pipe to the exhaust connection.
7. Connect the inert gas pipe to the hose nozzles.
The user must integrate suitable monitoring of the inert gas flow in the inert gas outlet
pipe. This must also be able to simultaneously detect a malfunction, and initiate suitable
actions to prevent possible damage.
5.3 Operation
Observe the basic safety instructions when using the pump.
Contents of the currently valid Operating Manual
Compliance with the classification limits stated in Atex-Directive 2014/34/EU, including
the regulations governing the implementation.
Contents of the process sequences specified for the user
Compliance with the maintenance intervals or specification of these intervals by the user
in the case of special processes.
Regular inspection of the suction and pressure side connections for leaks.
Regular inspection of the pressure-side connection for blockages. Particularly if a central
air exhaust system has been installed. The max. outlet pressure of 1.5 bar absolute must
not be exceeded under any circumstances. On exceeding the diaphragm pump must be
switched off.
Inspection of the inert gas connections and the safety device as described in chapter 5.2.
Deviations from the inert gas outflow must be detected. As the manufacturer, we recom-
mend a minimum inert gas flow of 20 l / h. A malfunction can be expected if this flow de-
viates by more than ± 10 percent during operation. The diaphragm pump is turn off,
where appropriate, to prevent ingress of pumped liquid in the crankcase. These malfunc-
tions may be: Interruption of the inert gas flow, diaphragm ruptures or other leaks (see
also chapter 7).

Installation and Operation
4000481-04 15
5.3.1 Start-up
Open inert gas supply, check gas flow
Switch on pump
5.4 Storage
The pumps are to be stored in a low-dust, interior room within the temperature range from
+ 5 to + 40 °C and at a relative air humidity < 90%.
Leave the protective elements on the suction and pressure ports. Another equally good
protection may be used.
5.5 Scrap Disposal
CAUTION !
The Diaphragm pumps must be disposed of in accordance with the 2012/19/EU
guideline and the specific national regulations.
Contaminated diaphragm pumps must be decontaminated according to the laws.
When recommissioning, a test run should be carried out with functional testing outside the
hazardous area (Ex).

Maintenance and Servicing
16 4000481-04
6 Maintenance and Servicing
6.1 General Requirements
Check the pump daily for unusual running noises and heat building up on the surface of
the pump.
Check the electrical and vacuum connections daily.
Check the inert gas supply daily to ensure it meets the minimum requirements stated in
chapters 5.2 and 5.3.
Inspect the pump chamber of the diaphragm pump for contaminants and damage after
1,000 operating hours. Clean and replace damage parts with new original parts as and
when necessary.
We recommend changing the diaphragm after 5,000 operating hours. The user may
specify that the exchange be made earlier, depending upon the application process.
6.2 Maintenance Performed by the User
All maintenance work must be performed outside the areas at risk of explosion. The pump
must be disconnected from the power supply before maintenance work starts.
WARNING !
Only perform the work that is described here, and that which is permitted to be done
by the user.
All other maintenance and service work may only be performed by the manufacturer
or a company authorized by him.
Do not interfere with the safety systems of the diaphragm pump.
Beware of the pump parts being possibly contaminated by hazardous substances.
Wear protective clothing if there is contamination.
Scope of permissible work:
Loosen and remove the hoses
Open and remove the pump heads
Inspect the pump chambers, diaphragms and valves
Deposits in the inside of the pump must be cleaned out
Change the diaphragms, valves and seals
Tools required:
Tool kit: Order No. 402106, consists of:
Order no. 826801 Pin type face wrench, adjustable, size 3,
Order no. 826801-6 Allan key, size 4,
Order no. 826801-5 Open spanner, size 17.

Maintenance and Servicing
4000481-04 17
6.2.1 Disassembly
1. Disconnect the power supply and ensure that it cannot be switched on again.
2. Open the screw clamps of the hoses on the pump body with the SW 17 open spanner.
3. Remove four machine screws (1) from each connection head with an Allan key, size 4.
4. Lift off the connection head (2) and the pump head (5). The valves (3), o-rings (4) and
diaphragm (7) are now freely exposed.
5. Loosen the diaphragm (7) at the strain washer (6) by turning the size 3 pin type face
wrench anticlockwise.
6. Clean the valves (3), the pump head (5)and the diaphragm (7) with a soft cloth and ace-
tone.
7. Check that the drive is in good working order.
Fig. 6 Disassembly, Assembly
WARNING !
Renew defective parts, if necessary! Wear protective gloves!
Parts must be renewed at the intervals stated in this Operating Manual or as speci-
fied by the user internally!
Do not clean with compressed air!
6.2.2 Assembly (see Fig. 6)
1. Place the pump so that the diaphragm is lying in a horizontal position.
2. Use the size 3 pin-type face wrench to tighten the pressure disc (8), the diaphragm (7)
and the strain washer (6) with the correct torque of 5 - 6 Nm.
3. Bring the connecting rod (see Fig. 7; 8) and the diaphragm (7) into the central position.
4. Replace the pump head (5).
5. Insert the valves (3) and the o-rings (4).
Ensure that they are lying completely flat. Do not insert the burred side facing the sealing
surface. Align the connection head flush with the pin.
6. Tighten the four machine screws (1) symmetrically with a torque of 3 to 4 Nm.
7. Reattach the hose connections with clamping ring screw fittings.
8. Reattach the hose connections with clamping ring screw fittings.

Maintenance and Servicing
18 4000481-04
6.2.3Test
Connect a vacuum measuring device to the suction connector and measure the ultimate
pressure.
If the device is working properly, then the figure stated in the technical data must be at-
tained within a maximum of one minute.
The pump must not make any abnormal noises.
Moving parts must not touch each other.
6.3Maintenance by the Manufacturer
Repairs and maintenance going beyond the extent of the work described in chapter 6.2 or
reconditioning or modification may only be performed by the manufacturer or authorized
workshops.
WARNING !
The user shall be liable for the consequences of an incorrect damage report or a
contaminated pump. The statements in the damage report are legally binding.
6.4Damage Report
You find the form of the damage report to the Download on our web page in the menu "ser-
vice" and "Downloads". www.gardnerdenver.com/de-de/welch
If you should not have an entrance to the Internet, you can request the form also gladly with
us, under phone [phone].
WARNING !
Incomplete or incorrectly completed damage reports may endanger the service per-
sonnel!
Give full information in the damage report, in particular regarding a possible con-
taminating.

Troubleshooting
4000481-04 19
7 Troubleshooting
During the warranty period, intervention in the diaphragm pumps and accessory components
may only be made by manufacturing firm.
Trouble
Cause
Remedy
by:
with:
Vacuum pump
does not start
No power supply
Qualified
electrician
Check electrical installation
Motor defective
Service
workshop
Exchange
Pump body defective
Repair and/or exchange
Vacuum pump
does not
generate a
vacuum or
only an
inadequate
one
Connected apparatus
and/or
connecting elements
leaking
User or
Service
workshop
Identify and seal the leak,
replace the seals and/or
hoses if necessary.
Vacuum pump leaking
Check the hose
connections between the
pump heads, replace the
hoses and/or fittings if
necessary.
Pump head leaking
Service
workshop
Repair and/or exchange
Diaphragm defective
User or
Service
workshop
Exchange of the diaphragm
(see chapter 6.2)
Valve defective
Exchange of the valve
(see chapter 6.2)
Vacuum pump dirty
General maintenance /
cleaning
Valves dirty
Cleaning condensates and
foreign objects out of the
valves.
Running noise
Vacuum pump dirty
General maintenance /
cleaning
Inert gas out-
flow deviating
(from the
manufacturer's
or user's
specification)
Diaphragm defective
Exchange
Screw connections leak
Tighten or replace screw
connections.
Pump head leaks
Service
workshop
Repair and/or exchange
Cable(s)
defective and/or brittle
Qualified
electrician
Exchange of the cable(s)

Spare Parts Overview
20 4000481-04
8 Spare Parts Overview
The spare parts lists contain all the spare parts and all the information necessary for order-
ing.
When ordering, please quote the description, quantity, serial number and order number!
CAUTION !
We are not liable for any damage caused by the installation of any parts not supplied
by the manufacturer.
8.1 Service kit
Designation
Order no. for :
MPC 301 Zp Ex
MPC 601 Tp Ex
Service kit
402038
402039
The service kit consists of:
Designation
MPC 301 Zp Ex
MPC 601 Tp Ex
Piece
Order no.
Piece
Order no.
O-Ring ø 12 x 2
4
829217-3
12
829217-3
O-Ring ø 25 x 2
4
829250-1
8
829250-1
Valve
4
400656
4
400656
Diaphragm
2
400732
4
400732