Sub MkIIP Oxygen & Carbon Dioxide Monitor
User Manual - US Navy Version
Document Ref
: AS2-802-14 -
January 2016
Page 4
2
Introduction
The SUB MkIIP is a combined oxygen and carbon dioxide (CO
2
) monitor. Oxygen is
monitored by an electrochemical cell and CO
2
is monitored by an infra red absorption
technique. Temperature compensation is automatically applied for oxygen data and both
temperature and pressure compensation is automatically applied to the CO
2
data.
The unit can be powered internally by alkaline batteries or by an external DC supply. An
optional Universal AC to DC external supply cable is also available.
In addition to the power switch, the standard instrument has only one operator control. A
single pushbutton controls backlights for each of the liquid crystal displays (LCD), and can
also be used to reset the elapsed time.
The unit is built in a waterproof enclosure which is vented to prevent collapse in hyperbaric
environments. The lid of the unit should only be opened in clean, dry environments. This
should only be necessary for calibration purposes or for changing batteries. The battery life
is long enough that during typical usage in a distressed or disabled submarine (DISSUB)
incident, there should be no need to change the batteries.
Gas levels are monitored by diffusion across waterproof membranes built into the unit. The
user should ensure that the instrument’s gas inlet ports remain as clean as possible to
prevent the protective membranes from becoming blocked.
