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The machine must be stopped when the temperature switch trips (100 °C).
2.3.3 Thermometer
The thermometer allows a visual display of the cooling liquid temperature.
2.3.4 Sealing Systems
The machine is equipped with labyrinth seals on the motor side and suction side.
Other sealing systems are optionally available, see
Mechanical Seals [
►
7]
.
Sealing systems prevent the process gas going to the bearings chambers.
Depending on the application, the sealing systems efficiency can be improved with a
barrier gas system, see
Barrier Gas System [
►
7]
.
2.4 Optional Accessories
2.4.1 Inlet Filter
The inlet filter protects the machine against dust and other solids in the process gas. The
inlet filter is available with a paper cartridge.
2.4.2 Gas Ballast Valve
The gas ballast valve mixes the process gas with a limited quantity of ambient air to
counteract the condensation of vapour inside the machine.
The gas ballast valve has an influence on the ultimate pressure of the machine, see
Tech-
nical Data [
►
34]
.
2.4.3 Silencer
A silencer at the discharge connection (OUT) can be provided to reduce the exhaust gas
noise.
2.4.4 Barrier Gas System
The barrier gas system allows the supply of compressed air or nitrogen into the motor
side shaft seals in order to improve the sealing efficiency.
This device is available either with or without nitrogen panel.
2.4.5 Mechanical Seals
The sealing systems can be equipped with mechanical seals. The following variants are
possible:
– Oil lubricated single mechanical seals on the motor side and labyrinth seals on the
suction side.
– Oil lubricated single mechanical seals on the motor side and suction side.
2.4.6 Nitrogen Panel
The nitrogen panel fitted to the base frame allows the supply of nitrogen to a number of
different points on the machine.
Each device consists of a solenoid valve to open or close the gas circuit, a pressure regu-
lator and a flow meter to adjust pressure and volume flow separately.
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