|
Sensors,
whether for
combustible
gases,
oxygen, or
toxic gases,
have a fixed
and finite
life. The
factors
which
determine if
a sensor
should be
replaced are
realized
during the
calibration
process.
Calibration
is the act
of
challenging
an
instrument
to respond,
by applying
a metered
calibration
gas to a
specific
sensor. A
functional
sensor
should yield
readings in
proportion
to the
concentration
of gas being
applied.
Variances
between the
known
concentration
of
calibration
gas and the
steady state
reading of
the
instrument
can be
changed by
adjusting
the span.
Typical
response
time is
approximately
2 minutes. |
sensor
integrity
