T3
Temperature class. Pumps belonging to temperature class T3 must only be
operated with gases or vapors which exhibit an ignition temperature of over 200
°C.
3.2 Conditions of safe use
The EDS pump must be operated in accordance with the definitions of normal use and
operational limits as specified within this manual.
Accessories and additional parts fitted to the EDS pump must fulfil the requirements of the
ATEX Directive 2014/34/EU regarding the equipment group and category and they must be
applicable for use in explosive atmospheres of the respective gas group and temperature
class. Accessories and additional parts should be approved by Edwards otherwise they may
have a detrimental effect on the pump performance and safety.
The mandatory safety instruments specified in this manual must be used and must not be
replaced with alternatives from other manufacturers without consultation with Edwards.
Only processes which fulfill the conditions of the normal operation as specified in this
manual must be used.
EDS pumps must only be used on processes if their materials resist the mechanical and/or
chemical influences and corrosion, under the respective operating conditions, so that the
explosion protection is always maintained.
Means for preventing back-flow of the pumped media must be used if back-flow can result
in process hazards.
Opening the EDS pump is only permitted with the pump switched off, isolated from the
electrical supply and in the absence of explosive atmosphere.
Process limits
Inlet pressure: The range of allowable inlet pressures is 0 – 1013 mbar.
Exhaust pressure: The maximum allowable exhaust pressure is 1200 mbar for T3 pumps and
1100 mbar for T4 pumps.
Inlet gas temperature: The maximum allowable inlet gas temperature is 110 °C for inlet
pressures < 150 mbar, and 80 °C for inlet pressures > 150 mbar.
Safety instruments
Refer to
(on page 34) and install and connect all mandatory
safety switches.
4. Description
Figure 1 EDS pump models
Page 13
A41802880_C - Description
