Estimation of Service Life by Breakthrough
Curve
Service life of cartridge varies depending on the gas concentration
in the environment.
Breakthrough curve represents the relationship between the gas concentration
level in
the environment and estimated service life.
How to Read
Measure
the gas concentration level in the environment and plot it on the Y-axis
on the breakthrough curve. Draw
an extension line from that point, parallel to the X-axis towards
the breakthrough curve. The estimated service life is
the value on the X-axis where the extension line meets the
curve. For example, with the cyclohexane concentration of
300ppm, the estimated service life of KGC-1M(C) cartridge
is 200 minutes (under temperature of 20 and
relative humidity of 50%). With the cyclohexane concentration of
500ppm, the estimated service life is 95 minutes (under
temperature of 30 and
relative humidity of 70%). If the cartridge is repeatedly used, and
used for a short period of
time in each occasion and the gas concentration level in
the environment remains constant, record the used time in
the “Record of used time” column on the user instruction
of the cartridge and replace the cartridge with a new one
when the accumulation of the used time reaches to the estimated
service life.
>Estimation
of service life using the breakthrough curve is just for
reference purpose
only. Service life varies depending on various factors.
>Decontamination
performance of the cartridge may remarkably decrease
unless
used under normal temperature and/or normal humidity.
>Residual service
life of organic vapor cartridge, if used for more than
half of its
estimated service life and stored for 5 days or more,
may become remarkably
short. Replace the cartridge well in advance under this
condition. |
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Estimation of service life other than by breakthrough curve
Estimation of service life by smell
It is dangerous to judge only by
smell. Smell can be used as a tool to judge for replacement if
it can be sensed below the permissible exposure limit of the
gas. Sense of smell can vary between individuals, and it can
get paralyzed if the gas leaks gradually.
Estimation of service life by inhalation resistance
Replace the cartridge with a new one when the inhalation
resistance increases (when the wearer feels difficulty in breathing),
regardless of decontamination capability remaining.
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Estimation of service life by particulate-removing
performance
(applicable when the cartridge with a particulate-removing
feature is used).
Replace the cartridge with a new one when:
*the particulate filtering efficiency gets decreased; and/or
*the filtering material gets damaged or distorted. |
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