Glossary - AMC 1ACOs Instructions Manual

AMC-1ACOs One Channel CO Monitor with DSI

1.6 GLOSSARY

Alarm
Calibration
Calibration Gas
CO
DSI
Gas Concentration
PPM
Span
T90
VFD
Zero Buffering
Zero Gas
Alarm is an audible, visual, or physical
presentation designed to warn the instrument
user that a specific level of a dangerous
gas/vapor concentration has been reached or
exceeded.
Calibration is the procedure used to adjust the
instrument for proper response.
Calibration Gas is a gas of known
concentration(s) used to set the instrument
span or alarm level(s).
Carbon Monoxide is a colorless, odorless, and
tasteless gas that is slightly lighter than air. It
is highly toxic to humans and animals in
higher quantities and is commonly produced
from engine exhaust
Dual Sensor Interface card is an integrated
circuit board that adds
sensor/transmitter/VFD capabilities to the 1A
Gas Monitor
Gas Concentration is measured:
 PPM
Parts Per Million (1% volume = 10,000PPM)
Full range of a sensor i.e. a CO sensor with a
full scale of 0-100 PPM has a 100 PPM span.
Response Time in seconds to achieve 90% gas
concentration reading. This a typical
calibration point that allows for sensor aging,
but tends to be less accurate than a T99
calibration,
variable-frequency drive is a system for
controlling the rotational speed of an
alternating current (AC) electric motor by
controlling the frequency of the electrical
power supplied to the motor.
Zero buffering is transmitter function which
forces the gas concentration reading to zero
when sensor is exposed to low concentration of
a gas. The zero buffers is provided in the
sensor specification.
Zero gas is gas with no concentration. Clean
air is an excellent source for zero calibration.
A known gas concentration can be entered
during zero calibration.
3