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WP33L_BA_K1_12_en_08.fm
2.5 Safety and protection devices
Safety valves Each compression stage of the Sauer compressor is equipped
with a safety valve, which will vent freely when the valve set pres-
sure is reached.
Safety valves are installed at the following locations:
–1
st
compression stage: at the cylinder head of the 2
nd
stage;
–2
nd
compression stage: in the final separator behind the 2
nd
stage.
Fusible plug/
Temperature
sensor
A fusible plug is fitted in the condensate separator of the 2
nd
sta-
ge to monitor cooling. It melts at 121 °C and allows the com-
pressed air to escape, when its temperature exceeds the
threshold value.
The fusible plug can only be used once. If it blows, it needs to be
replaced with a new one.
As an alternative to the fusible plug, the Sauer compressor can
be fitted with a temperature sensor to protect against a compres-
sor cooling failure. This sensor will shutdown the compressor if
the temperature of the compressed air exceeds the pre-set limit.
Final pressure
sensor
The Sauer compressor is fitted with a final pressure sensor,
which activates if the final pressure is exceeded. This sensor is
factory-set according to the customer’s particular final pressure.
If the final pressure is exceeded, an alarm is displayed.
Danger!
Safety devices must not be adjusted, tampered with or removed.
The safety devices must be periodically tested and checked.
Safety valves must be
– installed with a lock-seal
– should be replaced, adjusted and re-sealed only by autho-
rised personnel.
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