Hollis Explorer User Manual - page 49
CDM (CANISTER DURATION METER)
The EXPLORER Canister Duration Meter (CDM) is comprised of three main
parts:
1. A patented, absorbent temperature profile duration meter.
2. An Oxygen Injection Meter (based on CE tested durations).
3. A gaseous CO
2
sensor
The readings from all of these devices together can be used to report a
high confidence status regarding the state of the Absorbent Filter. Howev-
er, user experience and training should also be used to determine the va-
lidity of the readings given. Absorbent Filters are a key item in the rebreath-
er, and prone to miss-use. Great care should be taken when determining if
a dive can be safely performed with the filter in its current state. Flooding,
long time between uses, improper assembly, improper packing can all
contribute to the canister duration meter reporting false readings. Use
great care in assembling the device and in completing pre-breathe checks
on the Absorbent Filter and breathing loop. The CDM is a useful feature as
an aid to predicting absorbent duration.
WARNING: NEVER dive a partially used Absorbent Filter after
24 hours beyond its initial packing or opening irrespective of
the CDM meter reading. This includes partially used filters that
have been stored in a sealed loop or container.
TPM (TEMPERATURE PROFILE MONITOR)
This meter relies upon the heat producing reaction of the CO
2
absorbent.
Temperature sensors are used to determine the status of the CO
2
absor-
bent has been performed in laboratory conditions for many years. The
system detects a complex reaction heat wave front through the absorbent
as it is being used.
The duration of the Absorbent Filter depends mainly on the amount of CO
2
being produced by the diver and the depth of the dive.
DANGER: The TPM will not detect breakthrough conditions of a
poorly packed Absorbent Filter or failing seal. Therefore Pre-
breathe checks must always be carried out to ensure CO
2
is
being absorbed correctly by the filter.
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