Preface
Hydrogen Safety Precautions
xxii
TRACE 1300 and TRACE 1310 Hardware Manual
Thermo Scientific
Hydrogen Safety Precautions
Hydrogen is a colorless, odorless, highly flammable gas with the molecular formula H
2
and an
atomic weight of 1.00794, making it the lightest element. Hydrogen gas presents a hazard, as
it is combustible over a wide range of concentrations; at ambient temperature and pressure,
the range is from about 4 to 74.2% by volume.
Hydrogen has a flash point of -423 °F (-253 °C) and an auto-ignition temperature of
1040 °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.
Equipotentiality
*
On (Supply)
*
Off (Supply)
Equipment protected throughout by DOUBLE INSULATION or
REINFORCED INSULATION (Equivalent to Class II of IEC 536)
*
Instruction manual symbol affixed to product. Indicates that the user must
refer to the manual for specific
WARNING
or
CAUTION
information to
avoid personal injury or damage to the product.
Caution, risk of electric shock
*
Caution, hot surface
*
Caution, biohazard
In-position of a bistable push control
Out-position of a bistable push control
*
Jack socket
*
Symbol in compliance to the Directive
2012/19/EU
on Waste Electrical
and Electronic Equipment (WEEE) placed on the European market after
August, 13, 2005.
Table 1.
Instrument Marking and Symbols (Sheet 2 of 2)
Symbol
Description
+
-
