Watson-Marlow 700 User Manual
WATSON-MARLOW BREDEL MANUALS
m-atex701ra-gb-03: PB0348-2
ATEX Directive (94/9/EC) and
Watson-Marlow’s 700 series
pumpheads
Contents
1 Introduction 1
2 Pump models 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 9
11 Summary of modifications 9
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 Bredel are suitable for use in hazardous environments; ATEX compliant
pumps from the 700 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 701RA pumps are intended 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 Watson-Marlow ATEX
drives.
This document provides specific ATEX information and should be used in
conjunction with the original user manual.
ATEX Directive: Watson-Marlow 700 series pumpheads User Manual 1
2 Pump models
The following 700 series pumps are covered by this manual:
701RA ATEX Pumpheads
701RA 073.0101.A00
701REA 073.0104.A00
701RXA 073.0111.A00
701REXA 073.0114.A00
701RGA 073.0121.A0G Baseplate pumphead for STA-PURE tubing
Any 700 series pumpheads not listed here are NOT suitable for use in
hazardous environments (at date of issue).
for baseplate pumps (continuous)
for baseplate pumps (elements)
for baseplate pumps (continuous)
for baseplate pumps (elements)
Driven roller pumphead
Driven roller pumphead
Extension pumphead
Extension pumphead
3 Hazardous environments
All of Watson-Marlow’s ATEX pumps are classified as Group II, Category 2 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 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 same rating as the lowest ranking individual piece of equipment.
ATEX Directive: Watson-Marlow 700 series pumpheads User Manual 2
4 Operating parameters
The following tube materials can be used with 701RA pumpheads. Bore sizes range
from 9.6mm to 25.4mm, with a wall thickness of 4.8mm.
Tubing: working temperature range
Marprene 5C to 80C
Bioprene 5C to 80C
Pumpsil platinum-cured silicone -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).
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.
701RA pumpheads
Ambient temperature range 5C to 40C
Max peak pressure (701RA, 701RXA,
7014REA and 701REXA)
Max peak pressure (701RGA) 4 bar
Max continuous speed 360 rpm
Corrosion resistance See 10 Materials
Tube life See 7 Tube life
WARNING! Do not run dry for excessive periods. Roller and tubing
temperatures can exceed normal operating range.
WARNING! Do not run pumphead against a closed or restricted discharge pipe. This can lead to excessive roller and tubing temperatures
and pressures in excess of the limits in the table above. Excessive
pressure may cause tube failure.
2 bar
ATEX Directive: Watson-Marlow 700 series 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. 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 spindles
Tube burst and subsequent spilling of pumped fluid
Mechanical failure of rotor hub
Exothermic chemical reaction
Electrostatic discharge
Bearing failure
Spring failure
ATEX Directive: Watson-Marlow 700 series pumpheads User Manual 4
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