Advertisement
Dräger X-dock
Frequently Asked Questions
What exactly is tested during the quick bump test and can every concentration be used?
MISCELLANEOUS
The quick bump test checks whether values exceed or fall below the pre-alarm
threshold. Dräger demands increased reliability and therefore does not permit
just any concentration. Therefore, parameters are stored in the device for each
gas type allowed as minimum and maximum concentration. Furthermore, a time
is defined for every gas, indicating how long a value must have exceeded the
pre-alarm threshold in order to ensure reliability with all gases. This means the
maximum allowable concentration is dependent on the selected pre-alarm and
the factor that is stored in the device as the maximum permissible concentration.
What exactly is tested during the extended bump test and must the pre-alarm threshold
also be exceeded here?
An extended bump test compares the actual concentration of the test gas cylinder
is compared with the concentration indicated by the device. The concentration
must be within a tolerance band after a certain stabilization phase. The tolerances
may be set for each device with CC-Vision. However, it is recommended to use the
values tested and approved by Dräger. Since this test checks the deviation, it is not
necessary for values to exceed or drop below the pre-alarm threshold. The test is
therefore more accurate and more flexible, but it is also slower and consumes
a little more gas.
Am I able to set tolerances for the test?
Dräger X-dock does this for you. Tolerances should be defined sensor-specific,
since not every gas can be filled into test gas cylinders with the same tolerance
(for instance, H
carbon monoxide only have a tolerance of 2%).
The sensor accuracies differ as well. Therefore each device has a sensor-specific
tolerance – and makes your work easier. However, if you still want to set your
own tolerance you are able to override the given tolerance via the CC-Vision
Software.
HOME
S, HCN or THT often have a tolerance of 10%, but methane or
2
Advertisement
