6. Install the pipes downward from the roots pump, so that condensate does not flow back into the
roots pump.
7. Install a condensate separator if necessary.
8. If an air trap is created in the system, then install a condensate drain facility at the lowest point.
5.6 Setting and checking the temperature monitoring
WARNING
Risk of explosion when the ignition temperature of the pumped medium is reached
The missing of the prescribed temperature monitoring leads to an ignition in the suction chamber,
once the ignition temperature is reached.
► Always monitor the gas temperature in the fore-vacuum flange in order to safely observe temper-
ature class T3.
► When a gas temperature of 180 °C is reached, switch the roots pump off (zero potential).
Due to the compression work, the highest temperatures are generated in the exhaust channel of the
roots pump. In order to avoid effective sources of ignition due to prevailing gas temperatures, the roots
pump is equipped with a thermometer that measures the gas temperature in the exhaust channel.
Thermometer
Characteristics
Thermometer with flat
TA30A
connection head
6
8
.5
mm
● 2 thermocouples in the protective pipe
● 1 TMT82 type head transmitter in the connec-
tion head of the thermometer
● The head transmitter has two input channels for
both thermocouples
● The device transmits the signals as an analog
output signal. The prescribed SIL must be ad-
hered to.
Tbl. 9:
Thermometer type
5.6.1 Check thermometer installation dimension
Faulty temperature measurement
Faulty temperature measurement due to deviating installation dimension. The thermometer
cannot detect any maximum values.
Required tool
● Open-end wrench,
SW 17
1
2
X
Fig. 7:
Check temperature monitoring
1 Fore-vacuum flange
X
Installation dimension
2 Thermometer
Installation
28/60
