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
compensation
2
Carbon monoxide (CO) and hydrogen (H
) can occur simultaneously in workplaces in
2
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
, the other one measures only H
. The difference between the two signals is
2
2
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
-CP sensor is
2
installed. Deactivation is not possible.
Prerequisites:
— XXS CO H
-CP sensor is installed.
2
If this feature is used, CO+ appears in the measured value display.
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