8
Part Number
18150, E, 02/07/2018
Operation of Xintex Carbon Monoxide Alarm(s)
The CO Alarm uses a microprocessor to measure and accumulate CO levels. Using the principle of
“time-weighted averaging” (TWA), the CO Alarm monitors CO concentrations, temperature, and
time to calculate levels of carboxyhemoglobin (COHb). COHb is the degree to which the oxygen
carrying capacity of the blood is impeded by the union of carbon monoxide to the hemoglobin and
is expressed as a percentage. In layman’s terms, our bodies prefer absorbing CO to oxygen and
COHb is the ratio of absorbed carbon monoxide to oxygen in the bloodstream. The CO Alarm
calculates this COHb level as a function of time and determines the appropriate alarm time. SEE
TABLE 2.
Should a very high level of carbon monoxide exist, the CO Alarm will alarm in a few minutes.
However, if small quantities of CO are present or high levels are short-lived, the micro controller
will accumulate the information and determine when an alarm level has been reached. This
feature eliminates nuisance alarms. For example, in a recreational vehicle it is possible to see high
levels of CO for a very short time such as when parking or maneuvering. The CO Alarm takes this
all under consideration by totaling the quantity of CO detected over a period of time.
The CO Alarm is programmed to alarm at a COHb level of 10%. SEE TABLE 2.
Power Indicator
Danger Indicator
Horn
Test/Mute Button
