WATSON-MARLOW MANUALS
m-atex620ra-gb-03-PB0347-2
ATEX: Directive (94/9/EC) and
Watson-Marlow’s 620RA, 620REA,
and 620RE4A pumpheads
Section 2 o
f 3: Operating manual
cased pumps:
Contents
1 Introduction 1
2 Pumphead types 2
3 Hazardous environments 2
4 Operating parameters 3
5 Potential pump hazards 4
6 Installation guidelines 5
7 Tube life 6
8 Tube materials in
ATEX applications 7
9 Servicing and cleaning
requirements 8
10 Materials of construction:
620RA pumpheads 9
11 Summary of modications 10
12 ATEX marking 10
13 Replacements 10
14 Manufacturer’s Declaration 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 600 series are listed below, in Section 2 “Pump models”.
All of Watson -Marlow’s ATEX pumps have been rated as Group II, Category
2G IIB c T4 equipment. The 620RA, 620REA and 620RE4A pumpheads are intended
for use in gas based environments only. The pumpheads are sold individually (for
use with customer specied ATEX drives) and in dened congurations complete
with ATEX drives.
This document provides specic ATEX information and should be used in
conjunction with the original user manual.
ATEX: Watson-Marlow 620RA, 620REA and 620RE4A pumpheads User Manual 1
2 Pumphead types
The following 600 series pumpheads are covered by this manual:
620RA ATEX Pump heads
620RA* 064.0211.A00 Two rollers for max 2 bar.
Continuous tubing only
620REA* 064.0231.A00 Two rollers for max 4 bar.
LoadSure tubing elements only
620RE4A* 064.0431.A00 Four rollers for max 4 bar.
LoadSure tubing elements only
* 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 600 series pumpheads not listed here are NOT suitable for use in
hazardous environments (at date of issue).
3 Hazardous environments
All of Watson- Marlow’s ATEX pumps are classied as Group II, Category 2G IIB c T4
equipment under the denitions 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 are
likely to occur.”
Furthermore, “The explosion protection relating to this category must function in
such a way as to provide a sufcient 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 endan gered by
redamp and/or combustible dust.
NB: where two or more items of ATEX equipment are combined, the complete
assembly shall carry the same rating as the lowest ranking individual piece of equipment.
ATEX: Watson-Marlow 620RA, 620REA and 620RE4A pumpheads User Manual 2
4 Operating parameters
The following tube materials can be used with 620RA pumpheads. Bore sizes range
from 6.4mm to 15.9mm, with 3.2mm wall thickness. LoadSure tube elements are
available in 12mm or 17mm bore:
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 dene the boundary of the safe working envelope these
values must not be exceeded (ATEX compliance will be invalidated):
620RA pumpheads
Ambient temperature range 5C to 40C
Max peak pressure (continuous tubing) 2 bar
Max peak pressure (STA-PURE tubing) 4 bar
Max continuous speed 165 rpm (at 4 bar see below)
Max intermittent speed 265 rpm (at 4 bar see below)
Corrosion resistance See 7 Materials
Tube life See 5 Tube failure
ATEX: Watson-Marlow 620RA, 620REA and 620RE4A pumpheads User Manual 3
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.
5 Potential pump hazards
As part of the requirements of 94/9/EC all potential hazards, including expected
malfunctions, have been identied and subjected to a risk assessment. In order to
prevent these ignition sources becoming effective a number of changes have been
implemented. In addition to engineering modications, the changes include addi-
tional 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 spindles
Tube burst and subsequent spilling of pumped uid
Mechanical failure of rotor hub
Exothermic chemical reaction
Electrostatic discharge
Bearing failure
Spring failure
ATEX: Watson-Marlow 620RA, 620REA and 620RE4A pumpheads User Manual 4
6 Installation guidelines
Please refer to the standard 620R manual (PB0277) for general installation instruc-
tions.
All ATEX pumpheads include provision for the prevention and dissipation of
electrostatic charge. In order to dissipate electrostatic charge effectively there must
be sufcient electrical contact between the pumphead and the suitably earthed drive.
It is imperative that the 620RA, 620REA and 620RE4A pumpheads are
earthed by connecting the earth terminal on the track (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
rating. Earthed, conductive pipework should be used elsewhere in the system.
ATEX: Watson-Marlow 620RA, 620REA and 620RE4A pumpheads User Manual 5
7 Tube life
A number of factors contribute to the life of the tubing:
Factors inuencing tube life
Normal tube fatigue - dependent on tube size and material
Incorrect tube loading - see 620R, 620RE and 620RE4 manual (m-620r-gb-01) for
guidance
Excess working pressure - see Section 4 “Operating parameters”
Chemical incompatibility - a table of tubing compatibility can be found on
http://www.watson marlow.com/wmb gb/p chem a.htm. 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 pumped uid and pump materials the materials of
construction are listed in Section 10
Pumped uid can be ignited by surface temperature of rollers - all Watson-Marlow’s
ATEX equipment has been rated as T4.
ATEX: Watson-Marlow 620RA, 620REA and 620RE4A pumpheads User Manual 6
8 Tube materials in ATEX applications
The following Watson -Marlow tube materials are suitable for use in ATEX applications:
Pumpsil (platinum cured silicone)
● Pumpsil (platinum cured silicone)
● Marprene
● Bioprene
● STA -PURE PCS
● STA-PURE PFL
● Neoprene
● 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
specied 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:
Series Bore
620RA 15.9 3.2 22.3 45 45 45 unlimited unlimited unlimited unlimited
620RA 12.7 3.2 19.1 52 52 52 unlimited unlimited unlimited unlimited
620RA 9.6 3.2 16.0 63 63 63 unlimited unlimited unlimited unlimited
620RA 6.4 3.2 12.8 78 78 78 unlimited unlimited unlimited unlimited
* If length limit exceeded for STA- PURE PCS and STA-PURE PFL, ATEX rating reduced to IIA
(mm)
Wall
(mm)
OD
(mm)
Pumpsil
(cm)
STA-PURE
PCS* (cm)
STA-PURE
PFL* (cm)
Marprene** Bioprene** PVC Neoprene
** Marprene and Bioprene rated IIA when in contact with Polymides
ATEX: Watson-Marlow 620RA, 620REA and 620RE4A pumpheads User Manual 7
9 Servicing and cleaning requirements
Scheduled maintenance
The stainless steel pumping rollers run on sealed bearings and do not require
lubrication.
Remove the rotor and lubricate the follower rollers and roller engaging mechanisms
with a lithium -based grease. This should be carried out every six months for
intermittent duties and every three months for 24 hour duties.
If uid is spilled inside the pumphead, ush the pumphead out with water and mild
detergent as soon as possible. If specic cleaning agents are required to clean the
spillage, please consult Watson -Marlow Technical Support Ofce before proceeding,
in order to conrm chemical compatibility. The same cleaning procedure should be
used to limit the build up of dust (which can become electrostatically charged and/
or heated by friction).
Because of the importance of dissipating any electrostatic charge the earthing lead
should be regularly checked for signs of corrosion.
Rotor removal and re location
Remove the rotor cover and central locating bolt using a 5mm Allen key. Pull the
rotor off the keyed shaft, remove the key and clean thoroughly. Do not use tools to
lever the rear face of the rotor away from the inner face of the track; it should come
off by hand.
To replace the rotor, locate the key into the keyway and apply a thin layer of grease
over the shaft and key. Align the keyway of the rotor to the shaft key and slide
the rotor into position, ensuring that a positive “stop” is achieved and ensure that
the full length of the drive shaft is tted into the rotor. Do not force the rotor into
position. The rotor will slide into place easily if correctly aligned.
Tighten the hexagonal locating bolt to a nominal torque of 10Nm using a 5mm Allen
key.
The rotor bolt, which is impregnated with “Loctite 218” thread lock, should be
subjected to a maximum of three removals/relocations before renewal. To avoid
rotor bolt renewal after three removals, apply “Loctite 222” thread lock to the rotor
thread before relocation. This is critical to ensure prolonged, secure location of the
rotor hub to the drive shaft. Failure to complete this action will invalidate the terms
and conditions of the pumphead warranty.
Replace the rotor cover.
ATEX: Watson-Marlow 620RA, 620REA and 620RE4A pumpheads User Manual 8
10 Materials of construction:
620RA pumpheads
Description Part No. Material Finish
Rotor body MR2269M PPS Fortron/10% Celstran
SF50
Rotor arm MR2270M PPS Fortron/10% Celstran
SF50
Link bar MR2263M PPS Fortron
Rotor cover MR2055M Hytrel G5544
Guard MR3134T Aluminium alloy LM24 Powder coated
Track MR2267T Aluminium alloy LM24M Powder coated
Seal MR3133B Closed cell Neoprene
Spindle roller MR2014T Stainless steel 303S31
Pin pivot MR2265T Stainless steel 303S31
Pin reset MR2017T Stainless steel 303S31
Spindle roller
support
Thrust washer MR2010T Stainless steel 303S31
Leaf spring MR2266S Stainless steel 303S31
Lever adjuster MR2264M Stainless steel 316
Roller assembly
(620RA)
Roller assembly
(620REA, 620RE4A)
Bearing roller BB0059 MOS2 lled Nylon
Roller support MR2012T Zinc alloy
Circlip CX0179 Carbon spring steel to
Earth lead MRA0330A Copper Tin coating
MR2015T Stainless steel 303S31
MRA0250A Stainless steel 303S31
MRA0249A AlSl440C
BS1449, CS80
The above materials have been carefully selected and have a well proven track
record. However, if there are any aggressive chemicals present then it is imperative
that a risk assessment is conducted. This must not be limited to just the pumped
uid but should also include any other aggressive uids in the intended operating
environment.
ATEX: Watson-Marlow 620RA, 620REA and 620RE4A pumpheads User Manual 9
11 Summary of modications
ATEX features of 620RA pumpheads
Conductive Rotor The material used for the rotor body and arms includes 10%
Celstran (chopped stainless bres) in order to make the rotor
conductive and dissipate any electrostatic charge on the
stainless rollers
Earth strap An earthing bond links the safeguard and the track
ATEX label This is a requirement of the Directive and includes the ATEX
rating for the pumphead (II 2G IIB c T4)
ATEX manual This is an addendum to the existing manual and includes
ATEX specic information
12 ATEX marking
The 620RA pumpheads have been marked with the following labels:
13 Replacements
Spares and replacements should be ordered through Watson- Marlow pumps or
through an ofcial 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 7
years from discontinuation. The ability to implement this policy is not entirely with in
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: Watson-Marlow 620RA, 620REA and 620RE4A pumpheads User Manual 10
14 Manufacturer’s Declaration
Watson-Marlow Limited
Falmouth
Cornwall
TR11 4RU
England
Description
600 Series ATEX compliant peristaltic pumpheads
Product codes
064.0211.A00 620RA 2 roller for maximum 2 bar (continuous tubing)
064.0231.A00 620REA 2 roller for maximum 4 bar (LOADSURE only)
064.0431.A00 620RE4A 4 roller for maximum 4 bar (LOADSURE only)
Conformity
This document certifies that the above equipment complies with the requirements
of Directive 94/9/EC (the "ATEX" directive).
Rating
The pumpheads are rated as Group II, Category 2G equipment, with a T4
temperature classification, for use in IIB gas based environments.
Standards
EN1127-1:2011
EN13463-1:2009
EN13463-5:2005
CLC/TR 50404:2003
Manufacturer
Watson-Marlow Pumps, TR11 4RU, United Kingdom.
Notified body
Full details of the conformity assessment procedure can be found in the technical
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.
Date
22 December 2011
Signature
David Cole, Managing Director, Watson-Marlow Limited
EC Declaration of Conformity
II 2G IIB c T4
620RA pumphead
ATEX: Watson-Marlow 620RA, 620REA and 620RE4A pumpheads User Manual 11
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