Glossary Of Terms - General Monitors TA402A Instruction Manual

30 Model TA402A

Glossary of Terms

AC - Alternating Current.
Analog - Continuous, without steps.
Ambient Temperature - Surrounding or
background Temperature.
AWG - American Wire Gauge.
Canadian Standards Association - CSA is
an approval agency.
will test Gas Detection Instruments to the
standards set by approval agencies such as
CSA. CSA certification is required for
selling such equipment in Canada.
standards are
organizations outside of Canada.
Class I, Division 1 - This is a National
Electric Code (NEC) classification dealing
with hazardous locations and the degree
with which the hazard is present. Class I,
Division 1 is defined as any location where
ignitable concentrations of flammable gases
or vapors may be present under normal
operating conditions. For more information
on hazardous locations, refer to the NEC
Handbook, Article 500.
COM - Common.
Conduit - Tubing, piping or a protected
trough for electrical wires.
DC - Direct Current.
DCS - Distributed Controls System.
Digital - Stepped in specific increments.
Drain Loop - The purpose of a drain loop is
to collect condensation so as to prevent
moisture from entering the housing.
EEPROM -
Programmable Read Only Memory.
EMI - Electro-Magnetic Interference.
Testing laboratories
CSA
recognized by many
Electrically Erasable
Flicker Rate - The rate at which the
intensity of IR radiation from a fire changes
or modulates.
FMRC - Factory
Corporation.
Group B - Atmospheres containing more
than 30% Hydrogen or gases/vapors of
equivalent hazard.
Group C - Atmospheres
cyclopropane, ethyl ether, ethylene, or
gases/vapors of equivalent hazard.
Group D - Atmospheres such as acetone,
ammonia, benzene,
gasoline, hexane,
natural gas, naphtha,
gases/vapors of equivalent hazard.
Halogen Free Solvent - Solvent that does
not contain any of the following: astatine,
bromine, chlorine, flourine, or iodine.
IR Radiation - Infrared Radiation. Energy
with wavelengths longer than the red end of
the visible spectrum but shorter than radio
waves.
Latching - Holding on to. Latching Alarms
require manual resetting.
mA - Milliampere, one thousandth (.001) of
an amp.
Microprocessor Base Electronics - All of
the input signal processing, fault monitoring,
calibrating routines, setup routines, and the
outputs are under the control of a
microprocessor unit (MPU).
mV - Millivolt, one thousandth of a volt.
PCB - Printed Circuit Board.
PLC - Progammable Logic Controller.
RFI - Radio Frequency Interference.
Appendix A
Mutual Research
such as
butane, ethanol,
methanol, methane,
propane, or