17 Summary of modifications
ATEX features of 505L pumpheads
Conductive rotor
assembly
Roller end-caps have been replaced with conductive POM-C (ESD)
Knurled roller pin: Cuts through anodising on rotor end-platesto reduce
electrical resistance to earth
Earth strap
Earthing straps connect the track assemblies to the main body of the pumphead
(and to an extension pumphead, if fitted)
ATEX label
This is a requirement of the Directive and includes the ATEX rating for the
pumphead (II 2G Ex h IIB T4 Gb X)
ATEX manual
This manual has been produced specifically for thisATEXproduct and contains
information for safe use.
18 ATEX marking
The 505LA pumpheads have been marked with the following labels:
II 2G Ex h IIB T4 Gb X
Watson-Marlow Ltd
TR11 4RU, United Kingdom
Tech. File Ref. ATEX-WM
18.1 Key
II Equipment Group II for above ground areas(surface)
2G Equipment Category 2G (Gas) - Zone 1
Ex h Ignition protection labelling for mechanical devices
IIB Group IIB – typical gas: Ethylene
T4 Temperature classification (Gas) ≤ 135°C
Gb Group II (Gas); protection Level: High
X
Special conditionsof use for safe operation - See section 12 "Special conditions of use for
safe operation - Tube materials suitable for use with this equipment" on page20
PB0379:m-505atex-en-04 33
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