INFICON Sensistor ILS500 Leak Detection System - Manual (Page 6)

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Failure to observe the following precautions could result in damage to the
equipment:
Warning
Pressurizing objects at too high pressures can lead to the object bursting. This in
turn can result in serious injury or even death. Never pressurize objects that have
not previously been burst-tested or have otherwise been approved for the test
pressure you intend to use.
Caution
Do not open the detector! Service of this equipment may only be carried out by
service organizations authorized for this purpose by INFICON.
Caution
If the detector suffers external damage, it must be checked and repaired by a service
organization authorized by INFICON.
Caution
Do not expose the probe to a hydrogen concentration greater than 0.1% when the
instrument is not operating, as this could damage or destroy the probe sensor.
Caution
When the instrument is operating, the sensor can withstand temporary exposure to
hydrogen concentrations up to 100%. Avoid long exposures to high concentrations.
Caution
Always switch power off before connecting or disconnecting any cable.