2.5 Product usage limits
Parameter
Duo 11 ATEX
Installation location
● Indoors, protected against:
─ dust deposits
─ falling objects
─ fire-fighting water
● Outdoors, protected against:
─ falling objects
─ direct influence of weather such as rain, splash water,
strong drafts and sunlight
─ fire-fighting water
─ lightning strike
Installation altitude
max. 1000 m above sea level
At installation heights > 1000 m above sea level, the rated pow-
er of the motor must be reduced or the ambient temperature
limited due to increased heating of the vacuum pump.
Constant intake pressure
≤ 50 hPa
Tank size for pumping out atmos-
pheric pressure
max. 100 liters
Cycle operation
Operating duration > downtime, cycle > 20 mins
Exhaust pressure of the vacuum
pump
≤ 1500 hPa abs.
Exhaust pressure at OME
max. atmospheric pressure
Ambient temperature
+12 °C to +40 °C
Relative air humidity
≤ 85 %
Installation surface flatness
Horizontal
Intake temperature of medium to
be pumped
≤ 40 °C
Operation with gas ballast
Only permissible with inert gas: ≤ 1200 hPa abs.
Tbl. 6:
Permissible ambient and operating conditions
WARNING
Risk of explosion in the medium to be pumped as a result of increased pressure
With installation on the exhaust side, there is a risk of the exhaust pressure of the vacuum pump ex-
ceeding the atmospheric conditions. The ignition temperature of the medium to be pumped is lowered
in the suction chamber.
If the ignition temperature of the medium to be pumped falls below a temperature of +135 °C, there is
a risk of explosion, and consequently serious injury.
► Ensure that the ignition temperatures of the medium to be pumped is maintained above a tem-
perature of +135 °C at 2000 hPa abs.
Inspection of media by the user
Testing with ambient air as the medium to be pumped has shown that if the aforementioned ambient
and operating conditions are maintained, the maximum surface and gas temperatures do not exceed a
value of +130 °C.
With the utilization of dry media being pumped, heating of the pump could become more intense. Ap-
propriate measures are to be implemented to prevent this heating, for example reducing the permanent
intake pressure.
1. Check whether the thermal behavior of the media being pumped deviates from the behavior of the
ambient air.
2. Ensure suitable countermeasures wherever the difference to the ignition temperature is reduced.
2.6 Proper use
► Use the vacuum pump for vacuum generation only.
► Adhere to the installation, commissioning, operating, and maintenance instructions.
Safety
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