Thermo Scientific ISQ, User Manual

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Preface
Hydrogen Safety Precautions
Thermo Scientific ISQ User Guide xiii
Hydrogen Safety Precautions
Hydrogen is a colorless, odorless, highly flammable gas with the molecular formula H
2
.
Hydrogen gas presents a hazard as it is combustible over a wide range of concentrations: at
ambient temperature and pressure, this ranges from about 4% to 74.2% by volume.
Hydrogen has a flash point of - 423 °F (- 253 °C) and an auto-ignition temperature of
1,040 °F (560 °C). It has a very low ignition energy and the highest burning velocity of any
gas. If hydrogen is allowed to expand rapidly from high pressure, it can self-ignite. Hydrogen
burns with a flame that can be invisible in bright light.
Before you begin using hydrogen, you should conduct a risk assessment based on the quantity
of hydrogen to be used and the conditions of your laboratory. You should ask yourself:
“What hydrogen hazards associated with this project are most likely to occur?”
“What hydrogen hazards associated with this project have the potential to result in the
worst consequences?”
RADIOACTIVE HAZARD: Indicates that exposure to radioactive material
could or might occur.
READ MANUAL: Alerts you to carefully read your instrument’s
documentation to ensure your safety and the instrument’s operational
ability. Failing to carefully read the documentation
could or might put you at
risk for a physical injury.
TOXIC SUBSTANCES HAZARD: Indicates that exposure to a toxic substance
could occur and that exposure could or might cause personal injury or death.
For the prevention of personal injury, this general warning symbol precedes
the WARNING safety alert word and meets the ISO 3864-2 standard. In the
vocabulary of ANSI Z535 signs, this symbol indicates a possible personal
injury hazard exists if the instrument is improperly used or if unsafe actions
occur. This symbol and another appropriate safety symbol alerts you to an
imminent or potential hazard that
could cause personal injury .
Symbol Descriptor
WARNING - FIRE HAZARD:
The use of hydrogen as a carrier gas is dangerous. Hydrogen
is potentially explosive and must be used with extreme care. Any use of hydrogen gas must
be reviewed by appropriate health and safety staff and all installations of hydrogen systems
must be performed to applicable codes and standards. Thermo Fisher Scientific assumes
no liability for the improper use of hydrogen as a carrier gas.