WATSON-MARLOW MANUALS
m-atex505la-gb-03: PB0379-2
ATEX Directive (94/9/EC) and
Watson-Marlow’s 505LA, 505LXA and
505LGA pumpheads
Contents
Page Page
1 Introduction 1
2 Pumphead types 2
3 Hazardous environments 2
4 Operating parameters 3
5 Potential pump hazards 4
6 Installation guidelines 4
7 Tube life 5
8 Tubing materials in
ATEX applications 6
9 Servicing and cleaning
requirements 7
10 Materials of construction 8
11 Summary of modifications 9
12 ATEX marking 10
13 Replacements 10
14 Manufacturer’s Declarations 11
1 Introduction
Directive 94/9/EC, commonly known as the ATEX directive, carries obligations to
the person who places equipment on the market, in the EU territory, for use in
potentially explosive environments. A number of pumps manufactured by WatsonMarlow are suitable for use in hazardous environments; ATEX compliant pumps from
the 505LA series are listed below, in Section 2 Pump models.
Watson-Marlow’s 500 series ATEX pumps have been rated as Group II, Category
2G IIB c T4 equipment for use in gas based environments only. The pumpheads
are sold individually (for use with customer specified ATEX drives) and in defined
configurations complete with ATEX drives.
This document provides specific ATEX information and should be used in
conjunction with the original 505L user manual (m-505l-gb-01).
ATEX Directive: Watson-Marlow 505LA, 505LXA and 505LGA pumpheads User Manual 1
2 Pumphead types
The following 500 series pumpheads are covered by this manual:
505LA ATEX pumpheads
505LA* 053.4001.A00 505LA ATEX pumphead
505LXA* 053.4011.A00 505LXA ATEX pumphead
505LGA* 053.4010.A0G 505LGA ATEX pumphead
The following 500 series pumps are also ATEX-compliant but are dealt with in a
separate document (m-atex501rla-gb-05: PB0346).
501RLA ATEX pumpheads
501RLA* 053.0001.A00 Twin roller for 1.6mm wall thickness tubing
501RL2A* 053.0001.A20 Twin roller for 2.4mm wall thickness tubing
501RLGA* 053.0011.A0G Twin roller for 1.6mm wall Sta-Pure tubing
501RL2GA* 053.0011.A2G Twin roller for 2.4mm wall Sta-Pure tubing
501RLCA 053.0002.A00 Close-coupled for 1.6mm wall tubing
501RL2CA 053.0002.A20 Close-coupled for 2.4mm wall tubing
501RLCGA 053.0022.A0G Close-coupled for 1.6mm wall Sta-Pure
501RL2CGA 053.0022.A2G Close-coupled for 2.4mm wall Sta-Pure
* NB: these pumpheads are compatible with a number of Watson-Marlow cased
drives. However, the Watson-Marlow cased drives are not ATEX compliant and must
not be used in hazardous locations.
Any 500 series pumpheads not listed above are NOT suitable for use in
hazardous environments (at date of issue).
3 Hazardous environments
All of Watson-Marlow’s ATEX pumps are classified as Group II, Category 2G IIB c T4
equipment under the definitions of 94/9/EC:
“Group II, Category 2 products should be designed to be capable of remaining within
their operational parameters, as stated in the instruction manual, and based on a
high level of protection for their intended use, in areas in which explosive atmospheres caused by mixtures of air and gases, vapours, mists or air/dust mixtures”
(see page 1) “are likely to occur.”
Furthermore, “The explosion protection relating to this category must function in
such a way as to provide a sufficient level of safety even in the event of equipment
with operating faults or in dangerous operating conditions which normally have to
be taken into account”.
Watson-Marlow pumps must not be used in the underground parts of mines,
and in surface installations of such mines, likely to become endangered by
firedamp and/or combustible dust.
NB: where two or more items of ATEX equipment are combined, the complete
assembly shall carry the rating of the lowest ranking individual piece of equipment.
ATEX Directive: Watson-Marlow 505LA, 505LXA and 505LGA pumpheads User Manual 2
4 Operating parameters
The following tube materials can be used with the 505LA pumpheads in double “Y”
or continuous tubing configurations (two separate channels). Bore sizes range from
0.5mm to 9.6mm, with 2.4mm wall thickness. Only Watson-Marlow tubing should
be used to guarantee continued compliance with the ATEX directive.
Tubing: working temperature range
Marprene 5C to 80C
Bioprene 5C to 80C
Pumpsil -20C to 80C
STA-PURE PCS 0C to 80C
STA-PURE PFL 0C to 80C
Neoprene 0C to 80C
PVC 0C to 80C
The following parameters define the boundary of the safe working envelope - these
values must not be exceeded (ATEX compliance will be invalidated):
505LA pumpheads
Operational temperature range -20C to 80C
Max peak pressure 2 bar *
Max continuous speed 350 rpm
Corrosion resistance
Tube life See 7 Tube life
Torque limit (drive coupling) 2.2Nm
See 9 Materials of
construction
* Please note that, although Sta-Pure tubing is rated at 4 bar in a standard 505LG
pumphead, the ATEX version (505LGA) is limited to 2 bar.
WARNING! Do not run dry for excessive periods. Roller and tubing
temperatures can exceed normal operating range.
WARNING! Do not run pumphead against a dead-end condition (closed
discharge). This can lead to excessive roller and tubing temperatures
and pressures in excess of the limits in the table above.
When two or more items of ATEX equipment are combined, the permissible operating envelope will be determined by the narrowest range after considering all values
for a given parameter.
ATEX Directive: Watson-Marlow 505LA, 505LXA and 505LGA pumpheads User Manual 3
5 Potential pump hazards
As part of the requirements of 94/9/EC all potential hazards, including expected
malfunctions, have been identified and subjected to a risk assessment. In order
to prevent these ignition sources becoming effective a number of changes have
been implemented (see Section 10). In addition to engineering modifications, the
changes include additional operating instructions in order to specify correct usage in
hazardous locations. Please refer to Sections 6-10 for further details.
Recognised ignition sources
Surface temperatures of rollers and tubing
Tube burst and subsequent spilling of pumped fluid
Mechanical failure of rotor hub
Exothermic and pyrophoric chemical reactions
Electrostatic charging of tubing and fluid
Bearing failure
Spring failure
6 Installation guidelines
Please refer to the standard 505L manual (m-505l-gb-01) for general installation
instructions.
It is recommended that the chosen ATEX drive (motor/gearbox) is configured to
safely reach an overload condition before the 2.2Nm torque limit is reached. This
will prevent catastrophic failure of the rotor in the rare occurrence of a major
obstruction.
Particular attention should be given to the “Do’s and do not’s” section regarding
interfacing with suction and discharge tubing and/or pipework. It is important to
ensure proper connections are made to prevent leaks.
All ATEX pumpheads include provision for the prevention and dissipation of electrostatic charge. In order to dissipate electrostatic charge effectively there must be
sufficient electrical contact between the pumphead and the suitably earthed drive.
It is imperative that the 505LA pumpheads are earthed by connecting the
earth terminal (circled in the photograph below) to earth (usually via a
suitable point on the pump drive).
It is possible to check the effectiveness
of any earth connection by measuring
its electrical resistance. To ensure
reliable dissipation of static the
maximum resistance to earth
should not exceed 1 MOhm.
Peristaltic tubing has limited
conductivity and so its use should
be limited to the length adjacent to
the pumphead. Electrostatic testing
and length of tubing limitations
have been used to determine that
Watson-Marlow tubing is compliant
with a II 2G IIB c T4 rating. Earthed,
conductive pipework should be used
elsewhere in the system.
ATEX Directive: Watson-Marlow 505LA, 505LXA and 505LGA pumpheads User Manual 4
There is potential for the pumped fluid to become charged through pumping.
Protective measures should be implemented at the discharge outlet to dissipate this
charge safely.
The 505LA pumpheads should be run only with the track levers in the fully closed
position.
7 Tube life
Only Watson-Marlow tubing should be used to guarantee continued compliance with
the ATEX directive.
A number of factors contribute to the life of the tubing:
Factors influencing tube life
Normal tube fatigue - dependent on tube size, material and
pumphead speed
Incorrect tube loading - see 505L manual (m-505l-gb-01) for
guidance
Excess working pressure - see Section 4 Operating parameters
Chemical incompatibility - a table of tubing compatibility can be
found at
http://www.watson-marlow.co.uk/pdfs-global/chemcompat.pdf.
Immersion kits are available from Watson-Marlow for testing.
For each application it is strongly recommended that tube life should be determined
by trials, prior to installation in a hazardous environment. If this is not possible,
or if there is any doubt in terms of tube life then the following hazards should be
recognised before installing a pump in a potentially explosive atmosphere:
Chemical reaction between spilled pumped fluid and pump
materials - the materials of construction are listed in Section 9
Spilled, pumped fluid could be ignited by the surface temperature
of the rollers - Watson Marlow’s 505LA pumpheads have been rated
as T4 (meaning that even under worst-case operating conditions
the maximum surface temperature will not exceed 135C)
ATEX Directive: Watson-Marlow 505LA, 505LXA and 505LGA pumpheads User Manual 5
8 Tube materials in
ATEX applications
The following Watson-Marlow tube materials are suitable for use in ATEX applications:
l Pumpsil (platinum-cured silicone)
l Marprene
l Bioprene
l STA-PURE PCS
l STA-PURE PFL
l Neoprene
l PVC
Please note from the table below that there are limitations of length that can be used
for certain tube materials. Pumpsil cannot be used in any ATEX application above
the specified lengths listed. When using Bioprene and Marprene there is a reduction
in class suitability when they are in contact with Polymides.
Permissible length of tubing (cm) for IIB rating:
Bore
Wall
OD
Series
313DA, 501RLA, 505LA 9.6 2.4 14.4 69 69 69 unlimited unlimited unlimited unlimited
313DA, 501RLA, 505LA 8.0 2.4 12.8 78 78 78 unlimited unlimited unlimited unlimited
313DA, 501RLA, 505LA 6.4 2.4 11.2 89 89 89 unlimited unlimited unlimited unlimited
313DA, 501RLA, 505LA 4.8 2.4 9.6 104 104 104 unlimited unlimited unlimited unlimited
313DA, 501RLA, 505LA 3.2 2.4 8.0 125 125 125 unlimited unlimited unlimited unlimited
313DA, 501RLA, 505LA 1.6 2.4 6.4 156 156 156 unlimited unlimited unlimited unlimited
313DA, 501RLA 8.0 1.6 11.2 89 89 89 unlimited unlimited unlimited unlimited
313DA, 501RLA 6.4 1.6 9.6 104 104 104 unlimited unlimited unlimited unlimited
313DA, 501RLA 4.8 1.6 8.0 125 125 125 unlimited unlimited unlimited unlimited
313DA, 501RLA 3.2 1.6 6.4 156 156 156 unlimited unlimited unlimited unlimited
313DA, 501RLA 2.4 1.6 5.6 179 179 179 unlimited unlimited unlimited unlimited
313DA, 501RLA 1.6 1.6 4.8 208 208 208 unlimited unlimited unlimited unlimited
501RLA 0.8 1.6 4.0 250 250 250 unlimited unlimited unlimited unlimited
501RLA 0.5 1.6 3.7 270 270 270 unlimited unlimited unlimited unlimited
(mm)
(mm)
(mm)
Pumpsil
(cm)
STA-PURE
PCS* (cm)
STA-PURE
PFL* (cm)
Marprene** Bioprene** PVC Neoprene
* If length limit exceeded for STA-PURE PCS and STA-PURE PFL, ATEX rating
reduced to IIA
** Marprene and Bioprene rated IIA when in contact with Polymides
ATEX Directive: Watson-Marlow 505LA, 505LXA and 505LGA pumpheads User Manual 6
9 Servicing and cleaning
requirements
If aggressive liquids are spilled onto the pumphead, the head should be removed
and cleaned with a mild detergent. First, isolate the pump from the mains power
supply and remove the track by lifting the levers at either side of the pumphead.
Remove the tubing by stretching the element over the pegs (or remove the clamps
for continuous tubing). To detach the pumphead from the drive, remove the two
screws located in the backplate.
The cleaning procedure above should be used to limit the build-up of dust (which
can become electrostatically charged and/or heated by friction).
Avoid exposing the bearing seals to solvents for more than one minute. See
m-505l-gb-01, Section 9 Maintenance, for details.
The moving parts of the rotor should be checked from time to time for freedom of
movement. Roller bearings are sealed and do not require lubricating.
Because of the importance of dissipating electrostatic charge the earthing
leads must be regularly checked for signs of corrosion.
ATEX Directive: Watson-Marlow 505LA, 505LXA and 505LGA pumpheads User Manual 7
10 Materials of construction:
505LA pumpheads
Description Part No. Material Finish
Spindle - roller (knurled) * MN2582T Stainless steel 303S31
Rotor MN0547T Aluminium HP30 TF Anodised
Cradle - extrusion *
Cradle - extrusion
Track - extrusion MN0840C Aluminium 6063 Anodised
Rod - locking MN0843T Stainless steel 303S31
Spacer - locking rod MN0844T Nylatron GS
Lever - locking rod MN0850T Stainless steel 303S31
Shaft - drive MN0845T Stainless steel 303S31
Shaft - drive (505LXA) MN0860T Stainless steel 303S31
Plate - front MN0846S Aluminium 5083 Painted
Plate - rear MN0847S Aluminium 5083 Painted
Cover - adaptor MN0862S Aluminium 5083 Painted
Plate - end MN1029C Aluminium 5083 Painted
Tube - guide MN1206T Stainless steel 303S31
Spring SG0002 Stainless steel
Ball bearings - roller spindles BB0027 Carbon steel
Ball bearings - drive shaft BB0014 Carbon steel
Foot FB0001 Nylatron and rubber
Screws various Stainless steel
Washers various Nylon or stainless steel
Side assembly
Side assembly (505LXA)
Side assembly *
Adaptor assembly MNA0338A Speedal 2011 Painted
Rotor assembly MNA0370A
Roller - tube MN0544T Stainless steel 316S11
End cap - rollers * MN2586T
Bush and collar assembly MNA0638A Nylatron and aluminium
Earth strap - fastener * Carbon spring steel BS1449 Nickel plating
Earth strap - lead 200mm * MNA0693A Copper Tin coating
Earth strap - lead 140mm * MNA0694A Copper Tin coating
MN2583C
MN0839C
MNA0335A
MNA0364A
MNA0695A
Aluminium 6063 Painted
Aluminium 6063 and
stainless 302S26
POM-C (ESD) conductive
acetyl
Painted
* Components marked with an asterisk are unique to the ATEX 505LA range of
pumpheads.
ATEX Directive: Watson-Marlow 505LA, 505LXA and 505LGA pumpheads User Manual 8
11 Summary of modifications
The table below defines the modifications made to standard 505L pumpheads for
them to satisfy the requirements of the II 2G IIB c T4 ATEX rating:
ATEX features of the 505LA pumpheads
Roller end-caps have been replaced with
conductive POM-C (ESD)
Conductive rotor assembly
Earth strap
Knurled roller pin: Cuts through anodising on
rotor end-plates to reduce electrical resistance to
earth
Earthing straps connect the track assemblies
to the main body of the pumphead (and to an
extension pumphead, if fitted)
ATEX label
ATEX manual
This is a requirement of the Directive and
includes the ATEX rating for the pumphead
This is an addendum to the existing manual
and includes ATEX-specific information
ATEX Directive: Watson-Marlow 505LA, 505LXA and 505LGA pumpheads User Manual 9
12 ATEX marking
The 505LA pumpheads have been marked with the following labels:
13 Replacements
Spares and replacements should be ordered through Watson-Marlow Pumps or
through an official representative. Only Watson-Marlow spares and replacements
should be used in order to guarantee continued compliance with the ATEX
Directive.
Watson-Marlow’s policy is to provide spare parts for all products for a minimum
of seven years from discontinuation. The ability to implement this policy is not
entirely within Watson-Marlow’s control and cannot be guaranteed, but every effort
will be made to honour this policy.
Watson-Marlow Pumps can be contacted at:
Watson-Marlow Pumps
Falmouth
Cornwall
TR11 4RU
England
Tel: +44 (0)1326 370370
Fax: +44 (0)1326 376009
Email: support@watson-marlow.co.uk
Web: www.wmpg.com
ATEX Directive: Watson-Marlow 505LA, 505LXA and 505LGA pumpheads User Manual 10
14 Manufacturer’s Declarations
505L pumphead
Watson-Marlow Limited
Falmouth
Cornwall
TR11 4RU
England
Description 505LA ATEX compliant peristaltic pumpheads
Product codes 053.4001.A00 505LA 505LA ATEX PUMPHEAD
Conformity This document certifies that the above equipment complies with the requirements
Rating The pumpheads are rated as Group II, Category 2G equipment, with a T4
Standards EN1127-1:2011
053.4011.A00 505LXA 505LA ATEX EXT PUMPHEAD
053.4010.A0G 505LGA 505LA ATEX GORE PUMPHEAD
of Directive 94/9/EC (the "ATEX" directive).
temperature classification, for use in IIB gas based environments.
EN13463-1:2009
EN13463-5:2005
CLC/TR 50404:2003
EC Declaration of Conformity
II 2GIIB c T4
Manufacturer Watson-Marlow Pumps, TR11 4RU, United Kingdom.
Notified body Full details of the conformity assessment procedure can be found in the technical
Date 22 December 2011
Signature
reference file, "ATEX-WM". In accordance with the requirements of Directive
94/9/EC a copy of this file has been archived with the following notified body:
Baseefa (CE 1180), SK17 9RZ, United Kingdom.
David Cole, Managing Director, Watson-Marlow Limited
ATEX Directive: Watson-Marlow 505LA, 505LXA and 505LGA pumpheads User Manual 11
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