Pfeiffer Vacuum DUO 11 ATEX, Руководство по эксплуатации

Страница: 34 / 60

CAUTION
Danger of burns on hot surfaces
Depending on the operating and ambient conditions, the surface temperature of the vacuum pump
can increase to above 70 °C.
► Provide suitable touch protection.
Operating Conditions
● The optimal operating condition of the vacuum pump is continuous operation.
● Observe the application limits prescribed by
(see chapter “Product usage limits”, page 18) .
● The lowest possible ultimate pressures can be achieved with the gas ballast valve closed.
Procedure
You can switch on the vacuum pump in every pressure range, between atmospheric pressure and ulti-
mate pressure.
1. Switch the vacuum pump on at the mains switch, or, in the case of three phase motors, on site via
a protective circuit.
2. Allow the vacuum pump to warm up prior to process start, with the vacuum flange closed, for ap-
proximately 30 minutes.
3. Open the gas ballast valve if condensible vapors are present.
4. Check the operating fluid level with the vacuum pump running and at operating temperature.
– The fill level must move within the marks on the sight glass edge during operation.
– Check the operating fluid fill level daily during continuous operation or after every time the
vacuum pump is switched on.
6.3 Operating the vacuum pump with inert gas
If the process requires the supply of inert gas (optional), a supply line is absolutely essential on the gas
ballast valve to ensure controlled admission. Inert gas thins the process gas and prevents condensation
in the vacuum pump.
WARNING
Risk of injury from reactive, potentially explosive or otherwise hazardous gas/air mixtures
Uncontrolled gas inlet of air or gases containing oxygen may lead to the formation of potentially ex-
plosive gas/air mixtures in the vacuum system. Ignition can cause very serious injuries.
► Use inert gases only for the supply of ballast gas in order to prevent the formation of a potentially
explosive atmosphere.
► Ensure a closed inert gas system in order to avoid zone entrainment as a result of process gas
entering into the inert gas line.
WARNING
Danger of injury from impermissibly high inert gas pressure
Increased inert gas pressure compromises the operational reliability due to increasing power con-
sumption of the vacuum pump and potentially causes the temperature class threshold to be exceed-
ed. There is a danger of bursting if there is a potentially explosive atmosphere. This leads to injuries
caused by flying fragments, the escaping of high pressure, and damage to the unit.
► Observe the maximum permissible inert gas pressure of
1200 hPa (absolute) .
► Dose the inert gas quantity with the dosing screw on the gas ballast valve or on site.
NOTICE
Risk of damage from condensation in vacuum pump
During operation without gas ballast, condensation may form as a result of the vapor compatibility of
the vacuum pump being exceeded.
► Pump condensable vapors only when the vacuum pump is warm and the gas ballast valve open.
► Allow the vacuum pump to run on after process end for another 30 minutes with the gas ballast
valve open.
– This cleans the operating fluid and protects the vacuum pump against corrosion.
Operation
34/58