39
Maintenance
ToxicTwins
When the ToxicTwins feature is activated, the measuring channels of the XXS CO
sensor and the XXS HCN sensor are offset against each other in such a manner that
the device issues an alarm before the respective A1 alarm threshold is reached if both
gases are detected at the same time.
Prerequisites:
— The XXS CO and XXS HCN sensors are installed.
— The ToxicTwins feature is activated (using the Dräger CC-Vision PC software).
If the ToxicTwins feature is activated, HCN+ appears in the measured value display.
CO H
2
compensation
Carbon monoxide (CO) and hydrogen (H
2
) can occur simultaneously in workplaces in
the steel industry, refineries, sewage works, etc. Hydrogen affects the CO signal in
ordinary commercially available sensors, which leads to false alarms. The XXS CO H
2
-
CP sensor uses two sensing electrodes. One of these electrodes measures CO and
H
2
, the other one measures only H
2
. The difference between the two signals is
calculated, so that only the CO value will be displayed. For example, a hydrogen
concentration of 1000 ppm (2.5 %LEL) will only result in a maximum of 15 ppm CO
being displayed, but the CO alarm will not be triggered.
This feature is automatically available and activated if the XXS CO H
2
-CP sensor is
installed. Deactivation is not possible.
Prerequisites:
—XXS CO H
2
-CP sensor is installed.
If this feature is used, CO+ appears in the measured value display.
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